3D Imaging System Research Articles

An update on liver surgery- a new terminology and modern techniques.

Liver surgery is the cornerstone of the curative treatment of malignant liver tumors. However, the liver anatomy is very complex, and liver surgery is still associated with relevant morbidity despite many technical advances. The Brisbane nomenclature is used worldwide to classify liver resection. However, this nomenclature has several limitations as multiple terms are used for the same type of resection. Non-anatomical resections, multiple resections, and combined bilio-vascular resections were not mentioned. Therefore, new terminologies have been proposed for the precise and simple classification of liver resection. Furthermore, in recent years, many technical innovations have been introduced in liver surgery, such as 3D imaging systems and indocyanine green fluorescence, for better preoperative and intraoperative identification of tumor localization and critical vascular structures. Minimally invasive techniques are used more frequently in liver surgery. Potential benefits include less intraoperative blood loss, less pain, and a shorter hospital stay. The implementation of robotic systems also has an impact on liver surgery, and the number of cases reported in the literature is constantly increasing. The potential benefits of robotic liver resection over laparoscopic liver resection will be the subject of future studies.

3D integral imaging of acoustically trapped objects

3D imaging provides crucial details about the objects and scenes that may not be obtained via 2D imaging methods. However, there are several applications in which the object to be 3D-imaged requires to be immobilized. The integrated digital holographic microscopy (DHM) and optical trapping (OT) system is a useful solution for such a task, but both DHM and OT are mostly suitable for microscopic specimens. Here, for the first time to the best of our knowledge and as an analogy to the DHM-OT system, we introduce integral imaging (InIm) and acoustic trapping (AT) integrated system for 3D imaging of immobilized mesoscopic and macroscopic objects. Post-processing of InIm data enables reconstructing the scene at any arbitrary plane, therefore, it re-focuses any particular depth of the object, which is a curtail task, especially when the object is trapped by AT. We demonstrate the capability of our system by simultaneous trapping and 3D imaging of single and multiple irregularly shaped objects with mm sizes.

Clinical indications for the diagnosis and treatment of functional posterior crossbite in pediatric population: a narrative review with clinical description.

The present manuscript aims to provide an updated overview of the clinical management of functional posterior crossbite (FPXB) in growing subjects which can be helpful for orthodontists and pediatric dentists in daily practice. Database searches were performed until December 2023 to evaluate the published literature on the topic. The most pertinent articles were chosen for the review from the retrieved articles. No restrictions regarding the year or language of publication were applied. Additional studies were included by manually searching the references of the included studies. The manuscript has been structured for a narrative purpose. Although there is evidence of spontaneous correction in the transition from deciduous to mixed dentition, the literature suggests initiating the treatment early to increase the success rate. Early treatment involves reducing the risk for potential temporomandibular disorders and adaptations at the level of skeletal, dental, and muscle components. Recent advancements in tridimensionali (3D) imaging systems can also help define the appropriate treatment time case-by-case. Considering the prevalence and the multiple etiological factors involved in the development of FPXB in the pediatric population, orthodontists and pediatric dentists should decide the treatment time for this condition with a careful evaluation of the risk/benefit ratio.

Non-invasive Deep-Brain Imaging with 3D Integrated Photoacoustic Tomography and Ultrasound Localization Microscopy (3D-PAULM).

Photoacoustic computed tomography (PACT) is a proven technology for imaging hemodynamics in deep brain of small animal models. PACT is inherently compatible with ultrasound (US) imaging, providing complementary contrast mechanisms. While PACT can quantify the brain's oxygen saturation of hemoglobin (sO2), US imaging can probe the blood flow based on the Doppler effect. Further, by tracking gas-filled microbubbles, ultrasound localization microscopy (ULM) can map the blood flow velocity with sub-diffraction spatial resolution. In this work, we present a 3D deep-brain imaging system that seamlessly integrates PACT and ULM into a single device, 3D-PAULM. Using a low ultrasound frequency of 4 MHz, 3D-PAULM is capable of imaging the brain hemodynamic functions with intact scalp and skull in a totally non-invasive manner. Using 3D-PAULM, we studied the mouse brain functions with ischemic stroke. Multi-spectral PACT, US B-mode imaging, microbubble-enhanced power Doppler (PD), and ULM were performed on the same mouse brain with intrinsic image co-registration. From the multi-modality measurements, we further quantified blood perfusion, sO2, vessel density, and flow velocity of the mouse brain, showing stroke-induced ischemia, hypoxia, and reduced blood flow. We expect that 3D-PAULM can find broad applications in studying deep brain functions on small animal models.

Optical Sensor-Based Image Texture Characterization for Image Simulation Applications in College Gymnastics Instruction

Abstract Gymnastics learning is characterized by imitation and reference, and a teaching model combining optical sensors and image simulation systems may have promising results in college gymnastics courses. Based on the introduction of the meaning of college gymnastics teaching, the article sorted out the value performance of the image teaching mode and also established an optical three-dimensional imaging system based on optical sensors for gymnastics movement to obtain gymnastic images. In the optical 3D imaging system, the acquisition error of gymnastics images is reduced by using the finite distance image measurement method, and the quality of gymnastics images is enhanced by adaptive bilateral filtering and adaptive threshold selection of the Canny operator by the OTSU method. The enhanced gymnastics images are then inputted into a panoramic graphic imaging simulation system, and a gymnastics image simulation teaching model is established for colleges and universities. The effectiveness of the gymnastics image simulation teaching model is analyzed through a teaching comparison test conducted during simulation verification for optical imaging. In the optical imaging system, when the measurement distance is about 150m, the measurement error range is between [15″and 30″], and the MSE value of the gymnastic enhanced image obtained by the improved Canny algorithm decreases by 46.97% compared with the MSE value before the improvement. The students’ handstand score against the wall improved by 22.63 points compared to before the experiment, and more than 90% of the students were satisfied with the gymnastics image simulation teaching method. The teaching mode is constructed with the optical sensor to obtain the image characteristics of gymnastics movement, and the simulation system is innovative, which effectively promotes students’ interest in learning gymnastics courses and enhances their gymnastics training level.

Model of 2D-imaging system using correlation-based reception for image synthesis of radio light sources

The purpose of this work is to create a model of a system for constructing 2D images of radio light sources, where reception is based on correlation processing of signals coming from receiving antennas placed apart in space. In this article radio light refers to ultrawideband noise-like microwave radiation. Methods. To achieve this goal, a method for constructing an image is proposed and its implementation is tested using computer modeling of an imaging system. Results. It is shown how, using correlation signal processing methods, it is possible to construct 2D images of radio light sources using the example of computer modeling. Images of radio light sources were obtained, where it is possible to observe in one image two sources with a difference in the level of the emitted signal of 12 dB. Conclusion. A computer model of a correlation-based radio light receiver has been developed, which makes it possible to evaluate the influence of the number of antennas on the final image, as well as to obtain images of several radio light sources. The results of the computer simulation can be used to create a model of a real imaging system for radio light based on correlation processing.

Analysis of maxillary asymmetry before and after treatment of functional posterior cross-bite: a retrospective study using 3D imaging system and deviation analysis

BackgroundPrevious evidence would suggest that subjects affected by functional posterior cross-bite (FPXB) present an asymmetric morphology of the maxilla. However, no evidence is available concerning the morphology (symmetry/asymmetry) of the maxilla after treatment of FPXB. This study aimed to investigate the volumetric and morphological changes of the palate in FPXB subjects treated with maxillary expansion and to compare these data with an untreated control group. The study sample included 20 FPXB subjects (mean age 8.1 ± 0.9 years) who underwent maxillary expansion (MEG group) and 21 FPXB subjects (mean age 7.7 ± 1.2 years) as controls (CG group). Digital models were recorded at T0 (first observation) and T1 (12–18 months after first observation) and analyzed to assess palatal volume and symmetry. Deviation analysis and percentage matching calculation were also performed between original and mirrored palatal models for each patient. All data were statistically analyzed for intra-timing, inter-timing and inter-groups assessments.ResultsAt T0, the cross-bite side (CBS) was significantly smaller than non-cross-bite side (non-CBS) in both groups (p < 0.05). At T1, the CBS/non-CBS difference reduced significantly in the MEG group (p < 0.05) while slightly worsened in the CG, however without statistical significance (p > 0.05). The matching percentage of the palatal models improved significantly at T1 in the MEG group (T0 = 74.02% ± 9.8; T1 = 89.95% ± 7.12) (p < 0.05) while no significant differences were recorded in the CG (T0 = 76.36 ± 8.64; 72.18% ± 9.65) (p > 0.05).LimitationsThe small sample size and the retrospective design of the study represent two limitations that should be overcome with further clinical trials.ConclusionsSubjects with FPXB present an asymmetric development of the maxillary vault that improves after reestablishment of normal occlusion following maxillary expansion.

Influencing effect of minerals composition in natural granite rocks on surface roughness

The machining of natural rocks is gaining ground in art and architecture. However, the parameters influencing the design of surfaces with low surface roughness values are still the subject of research. In this study, we analysed the composition of granite specimens to examine their effect on surface roughness. 5 different granite samples were milled and then examined with XRD equipment. Minerals on the surface were analysed by light microscopy and scanning electron microscopy. Then the surface area of the minerals was measured with a 3D imaging system for surface roughness. Based on the obtained results, we examined the amount of constituents of each mineral and the value of the surface roughness of the minerals. The results showed that changes in certain mineral constituents affect the value of surface roughness during machining. By this, the expected surface roughness value of the rocks can be predicted based on the composition.

Quantifying Dermatochalasis Using 3-Dimensional Photogrammetry.

Creating an appropriate treatment plan for patients with dermatochalasis requires careful investigation of the periocular region. Utilizing photographic documentation can assist physicians in conducting preoperative analysis and managing expectations regarding surgical outcomes. This study aimed to quantify the periocular characteristics of dermatochalasis patients using standardized 3D imaging and to compare age and sex-related changes in periocular features. In this cross-sectional study, we recruited 145 Caucasian patients with periocular dermatochalasis, comprising 48 men and 97 women, aged between 35 and 91 years. Standardized three-dimensional facial photographs were taken using the 3D Imaging system VECTRA M3. Linear dimensions, curve length, angle, indices, and sizes were measured and analyzed, including palpebral fissure height (PFH), palpebral fissure width (PFW), upper lid fold-palpebral margin distance (FPD), upper palpebral margin length (UPML), lower palpebral margin length (LPML), canthal tilt (CT), palpebral fissure index (PFI), upper eyelid area, and ocular surface area. In the female group, the left-side PFH was slightly larger than the right-side PFH (P=0.023), but the difference was less than 1mm. The corresponding PFI also showed a difference in the female group (P=0.009). Statistically significant differences were shown in genders for specific parameters, except PFI (P=0.251) and CT (P=0.098). Among males, PFW (R=-0.523, p<0.001) and LPML (R = -0.514, P = 0.264) decreased moderately with age. The correlation between UPML and age was weak (R= -0.367, P= 0.010). Similarly, among females, moderate correlations were found between age and PFW (R=-0.566,P<0.001) and LPML (R=-0.537, P<0.001). Additionally, PFH (R=-0.315, P=0.002), UPML (R=-0.381, P<0.001), and ocular surface area (R=-0.457, P<0.001) showed weak correlations with age. The study found that dermatochalasis usually affects both eyes simultaneously, and age is a significant factor in the morphological changes of certain periocular features regardless of sex. The PFI is not influenced by age or sex. These findings may provide useful information for surgical planning and understanding age-related changes in the periocular area. 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 .

Controlled spherical deuterium droplets as Lagrangian tracers for cryogenic turbulence experiments.

The study of the smallest scales of turbulence by (Lagrangian) particle tracking faces two major challenges: the requirement of a 2D or 3D optical imaging system with sufficiently high spatial and temporal resolution and the need for particles that behave as passive tracers when seeded into the flow. While recent advances in the past decade have led to the development of fast cameras, there is still a lack of suitable methods to seed cryogenic liquid helium flows with mono-disperse particles of sufficiently small size, of the order of a few micrometers, and a density close enough to that of helium. Taking advantage of the surface tension, we propose two different techniques to generate controlled liquid spherical droplets of deuterium over a liquid helium bath. The first technique operates in a continuous mode by fragmenting a liquid jet, thanks to the Rayleigh-Taylor instability. This results in the formation of droplets with a diameter distribution of 2 ± 0.25DN, where DN is the diameter of the jet nozzle (DN = 20μm in the present experiment). This method offers a high production rate, greater than 30kHz. The second technique operates in a drop-on-demand mode by detaching droplets from the nozzle using pressure pulses generated using a piezoelectric transducer. This approach yields a much narrower diameter distribution of 2.1 ± 0.05DN but at a smaller production rate, in the range 500 Hz-2kHz. The initial trajectories and shapes of the droplets, from the moment they are released from the nozzle until they fall 3mm below, are investigated and discussed based on back-light illumination images.

3D volumetric imaging system based on a carbon-based light-induced ultrasound transmitter

3D volumetric imaging system based on a carbon-based light-induced ultrasound transmitter

High-resolution multi-spectral snapshot 3D imaging with a SPAD array camera.

Currently, mainstream light detection and ranging (LiDAR) systems usually involve a mechanical scanner component, which enables large-scale, high-resolution and multi-spectral imaging, but is difficult to assemble and has a larger system size. Furthermore, the mechanical wear on the moving parts of the scanner reduces its usage lifetime. Here, we propose a high-resolution scan-less multi-spectral three-dimensional (3D) imaging system, which improves the resolution with a four-times increase in the pixel number and can achieve multi-spectral imaging in a single snapshot. This system utilizes a specially designed multiple field-of-view (multi-FOV) system to separate four-wavelength echoes carrying depth and spectral reflectance information with predetermined temporal intervals, such that one single pixel of the SPAD array can sample four adjacent positions through the four channels' FOVs with subpixel offset. The positions and reflectivity are thus mapped to wavelengths in different time-bins. Our results show that the system can achieve high-resolution multi-spectral 3D imaging in a single exposure without scanning component. This scheme is the first to realize scan-less single-exposure high-resolution and multi-spectral imaging with a SPAD array sensor.

Validation of low-cost mobile phone applications and comparison with professional imaging systems for three-dimensional facial imaging: A pilot study

PurposeThe objective of this study was to investigate the accuracies of three-dimensional (3D) facial scanning mobile phone applications as compared to professional 3D facial imaging systems. Materials and MethodsA manikin head model was used as the subject for comparing six 3D facial imaging systems which comprised three professional 3D scanners (3dMDface, Artec Eva and Vectra H2) and three mobile phone applications (Bellus3D, ScandyPro and Hedges). For each system, five scans were taken to analyse (1) linear accuracy using 9 measurements (2) global and (3) regional 3D accuracy of the scanned surface by root mean square (RMS) and colour map analysis. Another set of five scans was repeated by a second operator to evaluate the inter-operator reproducibility for each system. ResultsAll the facial imaging systems had absolute errors lesser than 1.0 mm for the linear measurements. The technical error of measurement (TEM) for inter-examiner and intra-examiner linear measurements were within acceptable limits. Artec Eva, Vectra H2 and Scandy Pro had poor global 3D trueness (RMS > 1.0 mm) but good 3D regional trueness (RMS < 1.0 mm). 3dMDface, Bellus3D Face App and Heges had good global and regional 3D trueness. All the facial imaging systems had good global and regional 3D precision and reproducibility (RMS < 1.0 mm). ConclusionThis study demonstrated that mobile phone 3D scanning applications had comparable trueness, precision and reproducibility to professional systems. Colour map analysis supplemented the use of the RMS value to demonstrate facial regions of significant deviation. Clinicians should also consider the specific area or region of inaccuracies for each system to determine whether the chosen system is appropriate for the clinical condition or procedure. Clinical SignificanceMobile phone 3D facial imaging applications may be as accurate as 3D professional facial scanning systems for craniomaxillofacial purposes. However, the choice of the system may vary depending on the specific area of interest.

Three-Dimensional Anthropometry for Evaluating Philtrum Contour in Patients With Unilateral Cleft Lip: Comparison Between Photographic Assessment and 3-Dimensional Anthropometry.

Philtrum reconstruction in patients with unilateral cleft lip is a major concern in cheiloplasty. Moreover, a quantitative evaluation of the philtrum contour has not been possible. Advances in 3-dimensional (3D) imaging technology have enabled highly accurate assessments of facial surfaces. This study aimed to justify using 3D anthropometric measurements to quantify traditional photographic grading systems. Sixty-six children with unilateral cleft lip, aged 4 to 6 years (mean age: 69.1±5.7mo), who visited the outpatient clinic from January to December 2020 were included. A plastic surgeon panel graded the philtrum contour using digital photographs, and 3D anthropometry was performed using a 3D imaging system. The philtrum height, philtrum height difference, and dimple depth were measured at the middle of the philtrum. The philtrum height did not show significant changes across the photographic scores ( P =0.06), whereas noticeable differences were observed in the dimple depths based on photographic scores ( P <0.001). The correlation analysis revealed the highest correlation between the photographic score and dimple depth (rho=0.897, P <0.001). The philtrum height on the cleft side (rho=0.478, P <0.001) also correlated with the photographic score, but the correlation was weaker than that of the dimple depth. The dimple depth and philtrum height can help define the philtrum contour. Furthermore, the dimple depth reflects the philtrum contour better and is more suitable as a single parameter. However, relying on a single philtrum height measurement may be insufficient for reliable evaluations, as the relative height from the surrounding tissues is more important than the absolute height measured using 3D anthropometry.

WTP8.9 3D volume assessment as an objective tool in breast asymmetry management

Abstract Background The normal symmetrical appearance of the breast is a vital. It can be psychologically distressing to patients and affects their body perception when these differences are obvious. The goal of breast surgeons is minimising these differences to make them more acceptable to patients. Methods This study was done on 20 females seeking breast asymmetry correction. Age ranged from 18 to 45 years (mean age: 30.4). All patients had volumetric breast assessment using a (3D) imaging system (3D LifeViz®, Quantificare system). The first 10 patients were chosen randomly for breast (MRI) volumetry to confirm the results of the 3D system. The patients were managed with different single-stage surgical procedures depending upon the objective assessment of the volume difference between their breasts. Results Breast volume assessment using the 3D camera was done in all 20 patients pre-operatively 30 and postoperatively. The preoperative mean volume difference was 159.45 cm3, and the postoperative mean difference was 16.75 cm3, with an overall reduction in mean volume difference of 89.5%. Breast MRI volumetry was done for 10 randomly chosen patients to confirm the results and ranged between 3 and 12 cm3 (average 7.1 cm3) on the right and 0 and 15 cm3 (average 6.3 cm3) on the left. Comparing the 3D camera and MRI in assessing breast volume difference showed that the difference ranged between 1 and 5 cm3 with an average of 2.4 cm3, which was not statistically significant. Conclusion The 3D technology is useful objective tool to augment the surgeons’ experience. It helped to achieve an 84.57% reduction in volume difference in managing asymmetry with single-stage procedure.

P41. Evaluation and outcome comparison of biplanar projection radiographs to 3D intraoperative imaging systems

P41. Evaluation and outcome comparison of biplanar projection radiographs to 3D intraoperative imaging systems

Three-dimensional oxygen concentration monitoring in hydrogels using low-cost phosphorescence lifetime imaging for tissue engineering.

Oxygen concentration measurement in 3D hydrogels is vital in 3D cell culture and tissue engineering. However, standard 3D imaging systems capable of measuring oxygen concentration with adequate precision are based on advanced microscopy platforms, which are not accessible in many laboratories due to the system's complexity and the high price. In this work, we present a fast and low-cost phosphorescence lifetime imaging design for measuring the lifetime of oxygen-quenched phosphorescence emission with 0.25 µs temporal precision and sub-millimeter spatial resolution in 3D. By combining light-sheet illumination and the frequency-domain lifetime measurement using a commercial rolling-shutter CMOS camera in the structure of a conventional optical microscope, this design is highly customizable to accommodate application-specific research needs while also being low-cost as compared to advanced instruments. As a demonstration, we made a fluidic device with a gas-permeable film to create an artificial oxygen gradient in the hydrogel sample. Dye-embedded beads were distributed in the hydrogel to conduct continuous emission lifetime monitoring when nitrogen was pumped through the fluidic channel and changed oxygen distribution in the sample. The dynamics of the changes in lifetime co-related with their location in the gel of size 0.5 mm×1.5 mm×700 µm demonstrate the ability of this design to measure the oxygen concentration stably and precisely in 3D samples.

Calibration method for a multi-focus microscopic 3D imaging system.

This Letter presents a novel, to the best of our knowledge, method to calibrate multi-focus microscopic structured-light three-dimensional (3D) imaging systems with an electrically adjustable camera focal length. We first leverage the conventional method to calibrate the system with a reference focal length f0. Then we calibrate the system with other discrete focal lengths fi by determining virtual features on a reconstructed white plane using f0. Finally, we fit the polynomial function model using the discrete calibration results for fi. Experimental results demonstrate that our proposed method can calibrate the system consistently and accurately.

Evaluating the depth resolution of 3D sensors for manufacturing automation applications

The Intelligent Systems Division (ISD) at the National Institute of Standards and Technology (NIST) is performing research to support the development of documentary standards within ASTM subcommittee E57.23 on Industrial 3D Machine Vision Systems. This subcommittee is addressing the performance evaluation of 3D imaging systems that are used for manufacturing automation and vision guided robotics. The applications of these systems extend to other areas such as robotic bin picking, autonomous vehicles, 3D reconstruction, and entertainment. This paper discusses the activities of one work item (WK73176) that is addressing the evaluation of the depth resolution of a 3D imaging system. The key contributions of this paper include the description of multiple methods to determine the resolution of a 3D imaging system.

Development and Validation of a Comprehensive Perioral Evaluation Method Using Three-Dimensional Stereophotogrammetry.

The non-invasive three-dimensional (3D) stereophotogrammetry is widely used in anthropometry for medical purpose. Yet, few studies have assessed its reliability on measuring the perioral region. This study aimed to provide a standardized 3D anthropometric protocol for the perioral region. 38 female and 12 male Asians were recruited (mean age 31.6±9.6 years). Two sets of 3D images using the VECTRA 3D imaging system were acquired for each subject, and two measurement sessions for each image were performed independently by two raters. 25 landmarks were identified, and 28 linear, 2 curvilinear, 9 angular and 4 areal measurements were evaluated for intrarater, interrater, and intramethod reliability. Our results showed high reliability of 3D imaging-based perioral anthropometry by mean absolute difference (0.57 and 0.57 unit), technical error measurement (0.51 and 0.55 unit), relative error of measurement (2.18% and 2.44%), relative technical error of measurement (2.02% and 2.34%), and intraclass correlation coefficient (0.98 and 0.98) for intrarater 1 and intrarater 2 reliability; respectively 0.78 unit, 0.74 unit, 3.26%, 3.06% and 0.97 for interrater reliability; and respectively 1.01 unit, 0.97 unit, 4.74%, 4.57% and 0.95 for intramethod reliability. This standardized protocol utilizing 3D surface imaging technologies are feasible and highly reliable in perioral assessment. It could be further applied for diagnostic purpose, surgical planning and therapeutic effect evaluation in clinical practice in relation to perioral morphologies. 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 .