Photogrammetric Measurements Research Articles

Geodatabase, metric reconstruction and a GIS platform of historical-archaeological sites in Aquino

This paper presents the contents of a geodatabase developed from the outcomes of survey operations carried out, in several stages since 2015, within the archaeological context of the Roman city of Aquinum, in southern Lazio. The proposed geodatabase integrates traditional topographic surveying techniques with total station, GPS and GNSS geodetic receivers with photogrammetric surveys and terrestrial laser-scanner (TLS) measurements, including the realization of HBIM (Historical Building Information Modeling) models, to investigate some specific historical-archaeological evidence useful to understand the Roman and medieval urban structure of the city. The processing and management of the metric and information datasets were entrusted to a GIS platform, implemented in the opensource Quantum-GIS software, to optimize the flowchart of the acquisition/processing process and to realize an intra-site Web-GIS useful for the visualization and dissemination of the results. The methodological-operational approach applied in the research activities highlights the fundamental contribution that the technological innovations of geomatics can provide for the construction of elaborate knowledge concerning cultural heritage, also becoming the base for the elaboration of more complex and detailed analyses. In this case, for example, the HBIM digital model of the Church of Santa Maria of Libera was also used for an in-depth study in the field of structural engineering, as input to model the masonry vaults of the aisles of the church and assess their structural safety through the analysis methodology denominated "Thrust Network Analysis (TNA)." In addition, the high-precision 3D models developed from detailed photogrammetric measurements of the archaeological fragments and human remains found in the excavation areas made it possible to create interesting "visual digital products" that are immediately understandable even for non-experts, and thus particularly useful for wide-ranging knowledge dissemination.

Analytical equation for camera imaging with refractive interfaces

Camera imaging through refractive interfaces is a crucial issue in photogrammetric measurements. Most past studies adopted numerical optimization algorithms based on refractive ray tracing procedures. In these studies, the camera and interface parameters are usually calculated iteratively with numerical optimization algorithms. Inappropriate initial values can cause iterations to diverge. Meanwhile, these iterations cannot efficiently reveal the accurate nature of refractive imaging. Therefore, obtaining camera calibration results that are both flexible and physically interpretable continues to be challenging. Consequently, in this study, we modeled refractive imaging by employing ray transfer matrix analysis. Subsequently, we deduced an analytical refractive imaging (ARI) equation that explicitly describes the refractive geometry in a matrix form. Although this equation is built upon the paraxial approximation, we executed a numerical experiment that shows that the developed analytical equation can accurately illustrate refractive imaging with a considerable object distance and a slightly tilted angle of the flat interface. This ARI equation can be used to define the expansion center and the normal vector of the flat interface. Finally, we also propose a flexible measurement method to determine the orientation of the flat interface, wherein the orientation can be measured rather than calculated by iterative procedures.

Methodology for Performing Bathymetric and Photogrammetric Measurements Using UAV and USV Vehicles in the Coastal Zone

The coastal zone is constantly exposed to marine erosion, rising water levels, waves, tides, sea currents, and debris transport. As a result, there are dynamic changes in the coastal zone topography, which may have negative effects on the aquatic environment and humans. Therefore, in order to monitor the changes in landform taking place in the coastal zone, periodic bathymetric and photogrammetric measurements should be carried out in an appropriate manner. The aim of this review is to develop a methodology for performing bathymetric and photogrammetric measurements using an Unmanned Aerial Vehicle (UAV) and an Unmanned Surface Vehicle (USV) in a coastal zone. This publication shows how topographic and bathymetric monitoring should be carried out in this type of zone in order to obtain high-quality data that will be used to develop a Digital Terrain Model (DTM). The methodology for performing photogrammetric surveys with the use of a drone in the coastal zone should consist of four stages: the selection of a UAV, the development of a photogrammetric flight plan, the determination of the georeferencing method for aerial photos, and the specification as to whether there are meteorological conditions in the studied area that enable the implementation of an aerial mission through the use of a UAV. Alternatively, the methodology for performing bathymetric measurements using a USV in the coastal zone should consist of three stages: the selection of a USV, the development of a hydrographic survey plan, and the determination of the measurement conditions in the studied area and whether they enable measurements to be carried out with the use of a USV. As can be seen, the methodology for performing bathymetric and photogrammetric measurements using UAV and USV vehicles in the coastal zone is a complex process and depends on many interacting factors. The correct conduct of the research will affect the accuracy of the obtained measurement results, the basis of which a DTM of the coastal zone is developed. Due to dynamic changes in the coastal zone topography, it is recommended that bathymetric measurements and photogrammetric measurements with the use of UAV and USV vehicles should be carried out simultaneously on the same day, before or after the vegetation period, to enable the accurate measurement of the shallow waterbody depth.

Photogrammetric Measurement of Grassland Fire Spread: Techniques and Challenges with Low-Cost Unmanned Aerial Vehicles

The spread of natural fires is a complex issue, as its mathematical modeling needs to consider many parameters. Therefore, the results of such modeling always need to be validated by comparison with experimental measurements under real-world conditions. Remote sensing with the support of satellite or aerial sensors has long been used for this purpose. In this article, we focused on data collection with an unmanned aerial vehicle (UAV), which was used both for creating a digital surface model and for dynamic monitoring of the spread of controlled grassland fires in the visible spectrum. We subsequently tested the impact of various processing settings on the accuracy of the digital elevation model (DEM) and orthophotos, which are commonly used as a basis for analyzing fire spread. For the DEM generated from images taken during the final flight after the fire, deviations did not exceed 0.1 m compared to the reference model from LiDAR. Scale errors in the model with only approximal WGS84 exterior orientation parameters did not exceed a relative accuracy of 1:500, and possible deformations of the DEM up to 0.5 m in height had a minimal impact on determining the rate of fire spread, even with oblique images taken at an angle of 45°. The results of the experiments highlight the advantages of using low-cost SfM photogrammetry and provide an overview of potential issues encountered in measuring and performing photogrammetric processing of fire spread.

89 Evaluation of repeatability of anogenital distance measured with either a caliper or photogrammetry

Abstract The objective was to determine the repeatability of anogenital distance (AGD) measurements over time in growing heifers and evaluate the relationship of photogrammetric and caliper AGD measurements. Reproductive success is one of the most important determinants of profitability in the beef industry. However, fertility traits generally have low heritability, and there are few phenotypic traits that correlate to fertility in beef cattle. The AGD is the distance from the center of the rectum to the base of the clitoris. Recently, researchers in dairy cattle have reported a correlation between shorter AGD and improved fertility. In the published dairy research, AGD has been measured with the use of calipers. Photogrammetric measurement could be a quicker and safer way of taking the measurement and easier to implement on farm. Heifers (n = 153), either Angus or Hereford sired by commercial dams, were used in the analysis. Heifers were early weaned at 82 ± 7 d of age. Following weaning, heifers were managed in partially covered, dry lot pens and fed a moderate roughage growing diet. The heifers rotationally grazed predominantly tall fescue pastures beginning in April of 2023. Heifer AGD was evaluated monthly from June to September. Heifers weighed 210 ± 22 kg and 282 ± 6 d of age at the time of the first AGD measurements. Heifer body weight was collected monthly at time of AGD measurements. The heifers were restrained in a squeeze chute and had their tail held in a relaxed upright position and AGD was measured with a caliper. Immediately following caliper measurements, anogenital photographs were taken with an Iphone 14 plus. A white board with a forensic photomacrographic scale attached and the ear tag number recorded on the right corner was held adjacent to the vulva and was included in the photograph. Photographs were converted from HEIC to JPEG. A software program, Digitizer, was used to set the measurement scale using the forensic photomacrographic scale. The AGD was then digitally measured from the center of the rectum to the base of the clitoris. Repeatability of AGD and relationship of caliper and photogrammetric AGD were evaluated using the CORR procedure of SAS 9.4. Caliper AGD measurements were repeatable as all of the time points were moderately correlated (r ≥ 0.47; P ≤ 0.01) throughout the evaluation period. Photogrammetric AGD measurements were also repeatable as all of the time points were correlated (r ≥ 0.21; P ≤ 0.02) throughout the evaluation period. Photogrammetric AGD had a moderate correlation (r ≥ 0.44; P ≤ 0.01) with the caliper AGD measurements. In conclusion, AGD measurements were repeatable in growing heifers regardless of measurement method. Photogrammetric measurements may be a viable option for estimating AGD as they were strongly correlated to caliper measurements of AGD.

Scar Outcome in Unilateral Complete Cleft Lip Repair: A Comparative Analysis of Vertical Lip Lengthening Strategies Using the Rotation-Advancement Concept.

To assess the differences in scar outcomes between modified rotation-advancement techniques proposed by Drs. Mohler and Noordhoff, designed to address issues such as inadequate vertical lip length and scarring on the upper third of the lip in the original rotation-advancement technique. Retrospective single-surgeon (RD) study. Consecutive non-syndromic children (n = 68) with unilateral complete cleft lip and palate. Modified Mohler (columellar backcut reconstructed with C flap; n = 34) and modified Noordhoff (lower, medially-created backcut reconstructed with laterally-based triangular skin flap; n = 34) repairs. Using 12-month postoperative frontal photographs, scar evaluations (overall and superior, middle, and inferior portions of the lip) were appraised by an assessment panel composed by independent professional and nonprofessional raters employing four validated qualitative scar assessment scales: Manchester Scar Scale, modified Scar-Rating Scale, Stony Brook Scar Evaluation Scale, and Visual Analog Scale. Quantitative computerized photogrammetric scar widths of the superior, middle, and inferior portions of the upper lip were also measured. The modified Noordhoff method showed significantly (all P < .001) better scar quality for the overall scar and superior portion of the scar in all four scales compared to the modified Mohler method, with no significant (all P > .05) difference for the middle and lower portions. No significant difference (all P > .05) was observed for photogrammetric scar width measurements. The modified Noordhoff technique provided better qualitative results for unilateral complete cleft lip-related scars compared to the modified Mohler technique.

Measurements of oculo-palpebral landmarks and evaluation of patient's head position.

Keeping the head in a neutral position is requisite for glasses/lenses/head-up designs, the suitability of oculo-plastic surgery and for the grading the eye shift. Anatomically incompatible glasses are one of the common problems affecting accommodation, reducing comfort and disturbing by causing symptoms such as dizziness and nausea. The oculo-palpebral measurements act as a key determinant in symmetrical facial attractiveness. This study aims to investigate the most effective oculo-palpebral landmarks, head-neutral as the ideal position, taking into account of individual anatomical differences of these patients. 100 females and 100 males aged between 18 and 20 years were photographed. Digital photogrammetric measurements were made with the ImageJ program. Interpupillary and interhelical distances, besides bilateral palpebral fissure length and height, and iris diameter were calculated on front-facing photographs. Mean interpupillary distance was measured wider in males than in females. The mean length of palpebral fissure was 31mm; palpebral fissure height was 10mm. These figures were valid in both eyes and gender. The interhelical distance was calculated as the mean and was measured longer in men. Since the measurement values were the same in both sexes and on both sides, they were determined as important landmarks for controlling the head-neutral position, evaluating whether there was a deviation in the eye, and measuring the numerical value when detected. It is essential to check the side-symmetry of the patient's palpebral fissure height, palpebral fissure length, diameter of iris and corneal depth during oculo-plastic invention and artificial design.

Development of a Hydraulic Actuator for MRI- and Radiation-Compatible Medical Applications

This paper presents methods for the actuation, measurement, and control of a magnetic resonance imaging- and radiation-compatible single-axis translatory actuation system. As an exemplary demanding use case, the axis is developed for a robotic phantom for evaluating emitted radiation doses of radiotherapy devices. For this, the robot has to follow given three-dimensional trajectories of patients’ movements with an accuracy of 200 µm. For enabling use of magnetic resonance imaging, actuation of the robot is realized by hydraulic transmission without any metal parts or electrical components at the imaging side. The hydraulic axis is developed, built-up, and tested. In order to compensate for deviations from the targeted actuation trajectory resulting from tolerances, friction, and non-linearities in the system, a combination of photogrammetric measurement and iterative learning control is applied. The developed photogrammetric system is capable of determining the robot’s position with systematic errors of 35 µm and stochastic errors of 0.3 µm. Different types of iterative learning control methods are applied, parameterized, and tested. With this, the hydraulically actuated axis is able to follow given trajectories with maximum errors below 130 µm.

Prevalence and Association of Neck Disability Index (NDI) with Forward Head Posture (FHP) among Pharm D Students

Background: Forward Head Posture (FHP) is a prevalent condition characterized by the anterior positioning of the cervical spine, leading to increased cervical lordosis. This posture has been associated with various musculoskeletal disorders, particularly among students who spend prolonged periods in sedentary activities, such as reading or using computers and smartphones. The relationship between FHP, the Neck Disability Index (NDI), and the Craniovertebral (CV) angle is crucial for understanding the impact of this postural deviation on neck disability. Objective: The study aimed to determine the prevalence of FHP among Pharm-D students at the Margalla Institute of Health Sciences, Rawalpindi, and to assess the association between the NDI and CV angle in this population. Methods: A descriptive cross-sectional study design was employed, involving 169 Pharm-D students selected through convenient non-probability sampling. The ON Protractor application was used for photogrammetric measurements of the CV angle, while the NDI questionnaire assessed neck disability. Data analysis was conducted using SPSS version 25, with correlation coefficients calculated to explore the associations between FHP, NDI, and CV angle. Results: The prevalence of FHP among the participants was found to be 84%. The majority of students (63.3%) exhibited light disability according to the NDI. The mean CV angle was 41.49 degrees in standing and 41.5 degrees in sitting positions. No significant correlation was observed between the CV angle and NDI (r=0.357 in sitting and r=0.162 in standing positions), indicating that the degree of FHP was not directly related to the level of neck disability. Conclusion: FHP is highly prevalent among Pharm-D students, with a significant proportion experiencing light neck disability. However, the study found no significant correlation between the severity of FHP (as measured by the CV angle) and neck disability. These findings underscore the need for targeted interventions to address FHP and prevent neck disabilities in this population.

A comparative study of the effectiveness of photogrammetric versus manual anthropometric measurements.

The accurate measurement of the human body is essential when it comes to designing agricultural tools and equipment that can effectively accommodate and interact with individuals when performing a task. The traditional method for measuring an individual's body measurements is highly complex and requires two or more skilled individuals and reliable measurement tools. Finding a new approach that is speedier, more precise, and less expensive than current methods is therefore necessary. This study aims to develop an inexpensive novel photogrammetric anthropometric measurement setup that can extract the dimensions of an individual subject irrespective of their body shape. This study involved the creation of a setup comprising four cameras for a 360° photoshoot of human subjects to calibrate and test the developed measurement setup for capturing photos of human subjects and compare the results with manual measurements. Ten different body dimensions were measured using the setup. There was a significant correlation between the manual and photogrammetric measurement methods (0.943 < r < 0.997). The highest absolute error recorded was 1.87%. The photogrammetric method for collecting anthropometric data is a reliable substitute for manual measurements across diverse populations. The results indicate that this low-cost approach is highly precise and reliable, with strong correlation to manual measurements. Multiview photogrammetry proves effective for individuals of various body shapes, making it a versatile option for data collection.

Complex Methodology for Spatial Documentation of Geomorphological Changes and Geohazards in the Alpine Environment

The alpine environment with a high degree of nature protection is characterized by complete non-intervention. The processes and phenomena occurring in it are exclusively of a natural origin. Related geohazards are threatening the safety of people’s movement. They arise as a result of a combination of meteorological, hydrological, and geological–morphological factors permanently operating in the country. Therefore, the prevention of fatal events is limited to monitoring and predicting changes in selected objects where we expect change. Changes in the shape and dimension, or the object’s deformation, can be documented using geodetic and photogrammetric measurements. Our research focuses on monitoring a rock talus cone in High Tatras, Slovakia, at an altitude of 1700 m above sea level (ASL), created mainly due to erosion and seasonal torrential rains. To monitor changes in selected objects, we used mass non-contact methods of terrestrial laser scanning (TLS), UAS photogrammetry based on the principle of structure-from-motion–multi-view stereo (SfM–MVS), and airborne laser scanning (ALS). From the selective measurement methods, spatial measurement by a total station (TS) and height measurement based on the principle of precise leveling were used in the monitoring deformation network on a stand-alone boulder. The research results so far analyze and evaluate the possibilities, limits, effectiveness, and accuracy of the measurement and data processing methods used. As a result, we propose a complex methodology for monitoring similar phenomena in alpine environments.

Modeling and Accuracy Assessment of Determining the Coastline Course Using Geodetic, Photogrammetric and Satellite Measurement Methods: Case Study in Gdynia Beach in Poland

The coastal environment represents a resource from both a natural and economic point of view, but it is subject to continuous transformations due to climate change, human activities, and natural risks. Remote sensing techniques have enormous potential in monitoring coastal areas. However, one of the main tasks is accurately identifying the boundary between waterbodies such as oceans, seas, lakes or rivers, and the land surface. The aim of this research is to evaluate the accuracy of coastline extraction using different datasets. The images used come from UAV-RGB and the Landsat-9 and Sentinel-2 satellites. The method applied for extracting the coast feature involves a first phase of application of the Normalized Difference Water Index (NDWI), only for satellite data, and consequent application of the maximum likelihood classification, with automatic vectorization. To carry out a direct comparison with the extracted data, a coastline obtained through a field survey using a Global Navigation Satellite System (GNSS) device was used. The results are very satisfactory as they meet the minimum requirements specified by the International Hydrographic Organization (IHO) S-44. Both the UAV and the Sentinel-2 reach the maximum order, called the Exclusive order (Total Horizontal Uncertainty (THU) of 5 m with a confidence level of 95%), while the Landsat-9 falls into the Special order (THU of 10 m with a confidence level of 95%).

Machine Learning‐Based Distraction‐Free Method for Measuring the Optical Displacement of Long‐Span Bridge Structures

A photogrammetric displacement measurement method based on machine learning was proposed to improve the robustness to environmental disturbances. (1) To reduce the target positioning error caused by environmental vibration especially atmospheric turbulence, a machine learning‐based weighted location algorithm combined with an adaptive window selection strategy was developed. In an outdoor displacement table experiment, the proposed method’s root mean squared error (RMSE) is 0.04 mm when the distance is 50 m, showing better accuracy and stability. (2) To complement/correct the missing or anomalous data caused by adverse external conditions, such as severe occlusion or camera shaking, a fast data self‐diagnosis using a correlation vector machine was performed to make full use of the full‐field measurement results obtained from the images. The applicability of the proposed method in extreme cases was demonstrated in designed experiments and an actual displacement measurement task of a long‐span bridge subjected to vortex‐induced vibration.

The Importance of Virtual Reality in the Conservation of Cultural Heritage: An Examination of the Penataran Temple Case Study in Blitar Regency, East Java

Introduction: Visualization of digital archives and applications play a crucial role in preserving cultural heritage. Utilizing efficient 3D scanning, modeling, and deep learning-based reconstruction techniques enables the revelation of hidden parts of Penataran Temple Sample in Blitar Regency, East Java. This research emphasizes the utilization of virtual reality (VR) systems as digital repositories for Penataran Temple Example, facilitating in-depth exploration of this cultural asset. The importance of applications such as guided tours, computer-aided design, and geographic information systems increases in the examination of cultural heritage, offering a deeper and more comprehensive understanding of the preserved cultural wealth. Methods: The methodology used in this research includes photogrammetry, accurate photogrammetric assessment, and the utilization of deep learning. Information obtained from these three avenues is combined to construct a three-dimensional Point cloud, serving as the foundation for the digital repository of Penataran Temple Sample. Virtual reality (VR) platforms enable individuals to observe the temple through both first-person and aerial perspectives, featuring customizable interfaces within the virtual reality setting. Results: The research activities are dedicated to creating a digital repository for Penataran Temple Sample located in Blitar Regency, East Java using 3D Point cloud data. Data acquisition of Point cloud for comprehensive coverage of temple structures and hidden reliefs is achieved through the application of advanced photogrammetric measurements and deep learning technology. A virtual reality (VR) system is developed to offer deep visualization capabilities, including first-person perspectives and aerial views, fostering a profound understanding of the cultural significance and architectural design of the temple. To enhance the realism of the VR experience and enable mapping functions, a 3D simulation engine is incorporated. The utilization of the first-person perspective allows detailed virtual exploration and collision detection, while aerial views contribute to a comprehensive understanding of the temple architecture. Discussion: The digital archive system of Penataran Temple Sample leverages Virtual Reality (VR) technology to integrate 3D Point cloud data from various sources. This system facilitates both first-person perspectives and aerial perspectives, allowing comprehensive examination and in-depth understanding of the temple architectural layout. Accurate 3D data generation is achieved through the utilization of Unmanned Aerial Vehicles (UAVs), photogrammetry technology, and deep learning techniques. Conclusion: The investigation focuses on the utilization of VR technology as a digital repository at Penataran Temple Sample, employing 3D Point cloud methodology. Its primary aim is to provide engaging visual encounters and comprehensive understanding of the architectural complex. Furthermore, this research will encompass detailed 3D measurements and the creation of high-precision VR renderings of the complete temple structures. Additionally, there are opportunities to design VR applications for remote utilization and to produce stereoscopic perspectives through holographic means. The anticipation is that VR will play a significant role in the preservation and interpretation of the heritage of Penataran Temple Sampled in Blitar Regency, East Java, while also demonstrating potential for diverse applications across various platforms and settings.

Photogrammetric angular measurements as a diagnostic tool for orthodontic treatment planning

Objectives: The aim of the study was to compare and correlate angular measurements of soft-tissue profile between cephalogram and photograph and to identify gender difference. Materials and Methods: Sample size consisted of 100 lateral cephalograms and 100 profile photographs of 100 Indian Bengali population aged 18– 25 years (50 males and 50 females; mean age = 21.28 years). All records were taken in natural head position, centric occlusion, and lips in relaxed position. For evaluation of method reliability, intra-class correlation coefficients (ICCs) were calculated from repeated photographic measurements. Similarly, cephalometric and photographic measurements were compared for assessing Pearson correlation coefficients. Linear regression analyses were done for the variable with correlation coefficients &gt;r = 0.7. Ten angular parameters were used for soft tissue analysis and t-test was used for comparison. Statistical analyses were done using the Statistical Package for the Social Sciences for Windows software version 21.0. Results: The reliability test for photographs was found satisfactory with most measurements showing ICCs ≥ 0.90 and highly significant correlations (P ≤ 0.001) with cephalometric measurements. The N’-Prn’-Pg’ angle was found most effective for female subjects (r2 = 0.82), the N’-Prn’/N’-Pg’ angle for male subjects (r2 = 0.89) and among total subjects, the N’-Prn’/N’-Pg’ angle (r2 = 0.88). Conclusion: Photographs may be used for soft tissue evaluation for diagnosis and treatment planning as an alternative to cephalometric soft-tissue analysis.

Slope stability analysis of post-mining dumps with the use of photogrammetric geometry measurements – a case study

Slope stability analysis of post-mining dumps with the use of photogrammetric geometry measurements – a case study

Efficient intraoral photogrammetry using self-identifying projective invariant marker.

The re-measurement of full-arch implant digital impressions is an important step in denture restoration. This paper provides an efficient oral photogrammetry technology using projective invariant marker, applied in the re-measurement of full-arch implant digital impressions. We have developed a self-recognizing marker with projection invariance, along with its detection code. The marker is installed on the scanning body and used for photogrammetric measurements. Triangulation is utilized to determine the 3D coordinates of the marker, followed by a series of post-processing steps to obtain more accurate 3D coordinates. The experimental data indicate that the optimal working distance is between 200 and 250mm, with a minimum measurement error of less than 0.05mm and an average measurement error of 0.10 mm. The measurement time is less than 2min. The experimental results show that the photogrammetric system can obtain reliable positions of full-arch implants with efficient photogrammetry, without the need to enter the patient's oral cavity, and has potential clinical application value.

An Error Estimation System for Close-Range Photogrammetric Systems and Algorithms.

Close-range photogrammetry methods are widely used for non-contact and accurate measurements of surface shapes. These methods are based on calculating the three-dimensional coordinates of an object from two-dimensional images using special digital processing algorithms. Due to the relatively complex measurement principle, the accurate estimation of the photogrammetric measurement error is a non-trivial task. Typically, theoretical estimations or computer modelling are used to solve this problem. However, these approaches cannot provide an accurate estimate because it is impossible to consider all factors that influence the measurement results. To solve this problem, we propose the use of physical modelling. The measurement results from the photogrammetric system under test were compared with the results of a more accurate reference measurement method. This comparison allowed the error to be estimated under controlled conditions. The test object was a flexible surface whose shape could vary smoothly over a wide range. The estimation of the measurement accuracy for a large number of different surface shapes allows us to obtain new results that are difficult to obtain using standard approaches. To implement the proposed approach, a laboratory system for the error estimation of close-range photogrammetric measurements was developed. The paper contains a detailed description of the developed system and the proposed technique for a comparison of the measurement results. The error in the reference method, which was chosen to be phasogrammetry, was evaluated experimentally. Experimental testing of the stereo photogrammetric system was performed according to the proposed technique. The obtained results show that the proposed technique can reveal dependencies that may not be detected by standard approaches.

Aesthetic Improvement of Body Proportion Through Trunk Liposculpture: A Waistline-based Strategy.

Abdominal contouring through liposuction has been practiced for decades. However, few studies have focused on describing the definition and enhancement of the waistline in torso contouring procedures. In the present study, the authors proposed a waistline-based strategy for abdominal liposculpture to achieve a better aesthetic outcome and emphasize high overall patient satisfaction. The data of patients who underwent the waistline-based liposculpture procedure from 2020 to 2023 were retrospectively reviewed. Aesthetic improvement of the central trunk contour was evaluated and analyzed by comparing preoperative and postoperative photogrammetric measurements. Satisfaction with the outcome was assessed with a patient satisfaction questionnaire. A total of 70 patients were enrolled in this study. During 6 months of postoperative evaluation, the shape of the central trunk contour improved significantly (both waist concavity and hip convexity increased quantitatively, P < .05), while the position of the waist did not differ significantly postoperatively (P > .05). All patients were satisfied with their postoperative outcomes, including their overall aesthetic appearance, waistline position, and waist-to-hip ratio. There were no intraoperative complications or rare postoperative complications. Waistline-based liposculpture is a simple and effective procedure to improve the aesthetic outcomes of trunk contouring and has highly satisfactory results after long-term follow-up.

Observation of Nasal Morphology in Unilateral Microform Cleft Lip Repaired by a Hidden Skin Incision.

Microform cleft lip is the mildest type of cleft lip without obvious defects of the upper lip. The nose deformities of microform cleft lip include flattened nostril rim, alar base asymmetry, and septal deviation. A hidden skin incision with nasal base muscle reconstruction was introduced in nose deformities of microform cleft lip. To investigate the operative effect, we reviewed 21 patients with microform cleft lip treated with a hidden skin incision with nasal base muscle reconstruction from May 2020 to October 2022. Photogrammetric nasal morphometric measurements were compared preoperatively and six months postoperatively. The proportional value was obtained from the cleft and the noncleft sides, and paired t-test analysis was used to evaluate the surgical outcome. Significant differences were found in all nasal morphologic measurements at 6 months postoperatively compared to preoperatively (p < 0.05). After surgery, the alar base and nostril were narrowed, while the lateral lip height was increased on the affected side. The height of the nostrils on the affected side was increased, and the nasal columella deviation was released. In addition, the ratio of the cleft-to-noncleft nostril area was closer to 1.0 after surgery. The unilateral microform cleft lip nasal deformity can be repaired through a small hidden incision. This journal requires that authors assign a level of evidence to each article. For a full description of these evidence-based medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .