Image Definition Research Articles

수식과 그래프를 이용한 고등학생의 수열에 대한 이해와 개념 이미지 분석

Objectives In this study, the understanding of sequences and concept images using formula and graph were analyzed for second-year high school students. Methods Based on previous studies, a test tool was developed and applied to 73 second-year high school students, and some students were interviewed. Based on this, statistical analysis was conducted to investigate the difference in understanding according to the expression and sex of sequences for all students, and concept images were analyzed by applying concept definition and concept image model. Results First, the understanding of the graph expression of the sequence was higher than that of the formula expression, and significant differences were found. Second, female students' understanding of the sequence was higher than that of male students, and significant differences were found. This difference was due to the branching general term for the sequence, the recurrence relation expression of the sequence, and the graph expression that diverges while vibrating. Third, from the perspective of the concept image, a sequence was recognized as a list of numbers or a function in which natural numbers are the domain. In the case of recognizing it as a list of numbers, it was recognized that the sequence was specifically a list of simple numbers, that there were certain rules, that there was an equally spaced sequence or that there was a certain interval between terms, etc. Conclusions Implications related to how second-year high school students choose problems to develop sequence tasks by level based on the expression of sequences representing difficulties were provided.

Preoperative evaluation of biliary atresia.

Biliary atresia can be a challenging diagnosis to make as there is no single definitive diagnostic laboratory or imaging study available and no single agreed upon diagnostic algorithm. The purpose of this article is to review the complex puzzle of clinical, laboratory, and imaging studies that aid in the evaluation of infants suspected of having biliary atresia. We have reviewed historical and current manuscripts and society guidelines, added our own experience in evaluating infants for biliary atresia, and then summarized the findings to provide a concise review of what we feel is the modern approach to diagnosis of biliary atresia.

Sculpting Light: The Impact of Photographic Lighting on the Perception of Musculature and Physical Aesthetics Through the Homo Gaze

This study explores the impact of photographic lighting on perceptions of musculature and physical aesthetics through the homo gaze among 350 openly gay men in Bangkok. Employing three advanced lighting setups—split and fill, Rembrandt with black foam, and split overhead non-fill—this research methodically assesses how different lighting conditions influence visual perceptions across three body types: endomorph, ectomorph, and mesomorph. Participants rated muscular definition in images using a structured scale: defined, less defined, or unchanged. A comprehensive mixed-methods approach, integrating quantitative surveys and qualitative interviews, captures detailed emotional and aesthetic reactions. The findings demonstrate that lighting not only significantly alters perceptions of musculature but also shapes broader beauty standards within the gay community. By illustrating the crucial role of lighting in photographic art and design, this study contributes to visual culture discourses. It underscores the importance of inclusive aesthetic standards and the enhancement of visual communication for commercial purposes, offering strategic insights for engaging diverse markets.

Underwater image processing and target detection from particle swarm optimization algorithm

The underwater image obtained is difficult to satisfy human visual perception because of the particle scattering and water absorption phenomena when visible light propagates underwater. In underwater images, light absorption easily leads to image distortion and reduction of image contrast and brightness. Therefore, this work aims to improve the quality of underwater image processing, reduce the distortion rate of underwater images, and further improve the efficiency of underwater image extraction, processing, and tracking. This work combines intelligent blockchain technology in emerging multimedia industries with existing image processing technology to improve the target detection capability of image processing algorithms. Firstly, the theory of visual saliency analysis (VSA) is studied. The steps of image processing using VSA are analyzed. Based on the original Itti model, the visual significance detection step is optimized. Then, the theoretical basis and operation steps of particle swarm optimization (PSO) algorithm in intelligent blockchain technology are studied. VSA theory is combined with PSO to design underwater image processing algorithms and target detection optimization algorithms for underwater images. The experimental results show that: (1) the method has a higher F value and lower Mean Absolute Error. (2) Compared with the original image, the restored image entropy through this method is greatly improved, and the information in the image increases. Therefore, this method has good performance. Besides, this method performs well in image definition, color, and brightness. The quality of the restored image through this method is better than that of other algorithms. (3) Compared with similar algorithms, the relative errors of this method are reduced by 2.56%, 3.24% and 3.89%, respectively. The results show that the method has high accuracy. The research results can provide a reference for future underwater image processing and target detection research. In addition, the designed underwater image processing and target detection and tracking algorithms can improve the detection efficiency and accuracy of underwater targets and help to accurately obtain underwater target images.

Neuroimaging of postoperative pediatric cerebellar mutism syndrome: a systematic review.

Postoperative pediatric cerebellar mutism syndrome (ppCMS) poses serious morbidity after posterior fossa tumor surgery. Neuroimaging studies aim to understand its pathophysiology, yet these vary in methodology and outcome measures. Therefore, we systematically reviewed the current literature to evaluate the evidence for differences in neuroimaging features between children with and without ppCMS. Following PRISMA guidelines, a systematic review was conducted by searching for original articles on neuroimaging in children undergoing posterior fossa tumor surgery, comparing patients with and without ppCMS. Articles were selected based on predefined eligibility criteria. Data were systematically extracted, and risk of bias was evaluated. From the 866 articles identified, 50 studies fulfilled the inclusion criteria. Studies were categorized into 3 imaging domains: structural, diffusion, and functional imaging. Risk of bias assessment revealed a medium risk in most articles, predominantly due to unclear ppCMS definition and qualitative image analysis without blinding for ppCMS diagnosis. Preoperative structural imaging showed the association of ppCMS with midline tumor localization and involvement of the brainstem, superior cerebellar peduncle (SCP), or middle cerebellar peduncle. Postoperative structural and diffusion imaging highlighted SCP injury with reduced white matter integrity, while functional imaging demonstrated hypoperfusion in frontal lobes. Late follow-up showed T2-weighted hyperintensities in the inferior olivary nuclei of ppCMS patients. Neuroimaging features suggest that ppCMS is associated with efferent cerebellar pathway injury and hypoperfusion in frontal lobes, with level 2 a/b evidence. Large-scale prospective longitudinal neuroimaging studies comparing pre- and postoperative imaging are needed to further elucidate the pathophysiological mechanism of ppCMS.

Penetrating intracranial injury from a pencil in a pediatric patient: illustrative case.

Intracranial penetrating injuries from a pencil are exceptionally rare. The most common mechanism is a child running while holding a pencil. Potential consequences of intracranial pencil injury include direct trauma to brain structures, vascular injury, and intracranial abscess formation. A 3-year-old girl was at daycare and had fallen while running with a pencil. Computed tomography showed a pencil penetrating the left parietal bone through the left temporal lobe, terminating in the posterior limb of the internal capsule. Cerebral angiography was performed prior to the removal of the pencil to rule out vascular injury. Angiography of the left carotid artery revealed slight irregularity in the left M2 but no active extravasation. The patient was then taken to the operating room to have the pencil removed. Postoperatively, she did well and was discharged home after 6 days with no neurological deficits. Pencils are rare causes of intracranial injury in children. Definitive vascular imaging prior to pencil removal to rule out vascular injury and minimize the risk of hemorrhage after removal is recommended. Intraoperative irrigation and debridement, followed by antibiotics, are recommended to avoid abscess formation. Follow-up vascular imaging is recommended to rule out pseudoaneurysm. https://thejns.org/doi/10.3171/CASE24494.

Prevalence of ipsilateral “vulnerable carotid plaques with

BackgroundCarotid plaques may be an important etiology in ischemic stroke. We aimed to assess carotid plaque characteristics ipsilateral and contralateral to the ischemic stroke and assessed the prevalence of “vulnerable carotid plaques with <50% stenosis” based on different imaging-based definitions in patients with large vessel occlusion and source of embolic stroke of undetermined source (ESUS) on CT Angiography (CTA). MethodsData are from the ESCAPE-NA1 trial (Efficacy and safety of nerinetide for the treatment of acute ischemic stroke), a multicenter, randomized study that included anterior circulation large vessel occlusion patients undergoing thrombectomy. Various CTA features of plaque vulnerability were combined to define “vulnerable carotid plaques” in different ways. Within ESUS patients, prevalence of vulnerable plaques ipsilateral vs. contralateral to the intracranial occlusion was compared. ResultsWe analyzed 132 patients whose ischemic stroke mechanism was determined to be ESUS. Plaques causing 30–50 % stenosis (as compared to no stenosis) and plaque surface irregularity were significantly more common in ipsilateral carotid arteries (37[28.0 %] vs. 18[13.6 %]; p < 0.001 and 102[77.3 %] vs. 78[59.1 %]; p = 0.002). The prevalence of ipsilateral “vulnerable carotid plaques” varied depending on imaging definition used for such plaques between 55 and 74 %, but irrespective of the definition used, the prevalence of “vulnerable carotid plaques” was consistently higher in ipsilateral carotid arteries compared to contralateral carotid arteries. ConclusionsIn ESUS patients undergoing thrombectomy for anterior circulation large vessel occlusion, vulnerable carotid plaques are more prevalent ipsilateral to the intracranial occlusion. Irregular plaque surface, and a higher degree of stenosis were the most common vulnerable plaque features.

MR imaging of the penis: What a radiologist needs to know!

Magnetic resonance imaging (MRI) plays an important role in imaging of penile pathologies due to its excellent soft tissue resolution and multiplanar imaging capabilities. This imaging review describes the MRI protocols and anatomical considerations in penile pathologies. MRI not only serves as a complementary tool to ultrasound in evaluation of trauma, infections, inflammatory diseases, and malignancies, but is also used as the definitive imaging modality for evaluation of penile prosthesis and complex cases.

Combination Diagnostics: Adding Blood-Based ctDNA Screening to Low-Dose CT Imaging for Early Detection of Lung Cancer.

Annual low-dose CT screening of individuals with a smoking history identifies early curable lung tumors and reduces cancer mortality by 20%, yet only a minority of eligible patients undergo such monitoring. Mazzone and colleagues apply a blood-based cfDNA fragmentomic assay as a high-sensitivity/low-specificity pre-screen to help stratify individuals who may benefit most from more definitive low-dose CT imaging. See related article by Mazzone et al., p. 2224.

Imaging modalities for atraumatic shoulder hypermobility: a scoping review.

Objective measures from imaging studies have the potential to assist in timely diagnosis of atraumatic shoulder hypermobility to better guide management. The aim of this scoping review is to examine imaging modalities and techniques used to characterize atraumatic shoulder hypermobility. MEDLINE, EMBASE, SPORTDiscus, Cochrane Library, and Web of Science were searched up to May 2024 for any primary study investigating imaging findings seen in atraumatic shoulder hypermobility. Patients with unilateral instability were excluded given its frequent association with traumatic origin. Eighteen observational studies met inclusion criteria. Results were divided into outcomes relating to capsular redundancy, glenohumeral anatomy, and muscle activation. Five studies using magnetic resonance arthrography (MRA) demonstrated statistically significant increases in capsular cross-sectional area (CSA), while a significant superior capsular elongation was reported by two studies in patients with multidirectional instability (MDI). Labrocapsular distance, glenocapsular ratio, and the presence of a combined sail and triangle sign on MRA were highly sensitive and specific parameters for identifying MDI. There were inconsistent findings for alterations of glenohumeral anatomy. Ultrasound assessments of acromiohumeral distance (AHD) were significantly increased in patients with MDI, but not in shoulders with hypermobility alone. Similarly, muscle activity measured by electromyography or glenohumeral translations differed significantly in patients with MDI, but not in those with hypermobility alone. Radiographic markers of capsular redundancy (e.g., CSA, labrocapsular distance, glenocapsular ratio), AHD, and muscular activity are useful in the diagnosis of MDI. However, there are no definitive imaging markers for diagnosing atraumatic shoulder hypermobility without MDI.

High-definition quadriwave lateral shearing interferometry.

We present an evolution of quadriwave lateral shearing interferometry that improves the definition of quantitative phase images. It is now possible to produce images with as many pixels as the camera that records the interferogram. This is done by moving a diffraction grating in front of the camera and linearly combining at least nine acquisitions. In this paper, we present the principle of this technique and illustrate it by several examples acquired on a microscope with both calibrated and biological samples. We demonstrate the possibility of producing quantitative phase images with 5.5 million pixels, which are to our knowledge the largest images ever produced by a wavefront sensor.

Chemical shift-encoded multishot EPI for navigator-free prostate DWI.

DWI is an important contrast for prostate MRI to enable early and accurate detection of cancer. This study introduces a Dixon 3-shot-EPI protocol with structured low-rank reconstruction for navigator-free DWI. The aim is to overcome the limitations of single-shot EPI (ssh-EPI), such as geometric distortions and fat signal interference, while addressing the motion-induced phase variations of multishot EPI and simultaneously allowing water/fat separation. DWI data were acquired from 7 healthy volunteers using both Dixon 3-shot EPI and standard fat-suppressed ssh-EPI with similar scan times for comparison. Two readers evaluated image quality using a 5-point Likert scale regarding different aspects. The ADC values were quantitatively compared between protocols. To show feasibility in a clinical setting, the protocol was applied to two patients. From the reader scores, Dixon 3-shot EPI significantly reduced geometric distortion compared with ssh-EPI (p < 0.01), with no significant differences in edge definition, SNR, or overall image quality. There was no significant difference in ADC values between the two protocols. However, the Dixon multishot-EPI protocol offered advantages such as self-referenced B0 map-driven distortion correction, greater flexibility in imaging parameters, and superior fat suppression. In the patient data, the lesion could be clearly identified in both protocols and on the associated ADC maps. The proposed Dixon 3-shot-EPI protocol shows promise as an alternative to ssh-EPI for prostate DWI, providing reduced geometric distortions and improved fat suppression. It addresses common DWI issues based on EPI and enhances scanning flexibility, indicating potential for optimized imaging.

CONCEPT IMAGE AND CONCEPT DEFINITION SCHEMES AS TOOLS FOR ANALYZING STUDENTS’ COMPREHENSION OF LIMIT OF A FUNCTION

This paper aims to analyze one’s understanding of limit of a function based on Concept Image and Concept Definition schemes, which can be used as powerful tools in research that have mathematical comprehension as part of their object of study. For that, we developed and applied a set of tasks involving limits of functions to students who had already been in a Calculus course. Vinner’s study about concept image and concept definition was the theoretical framework of this paper. The results obtained let us observe the plurality of interpretations about limits and other adjacent concepts, which allowed us to trace, in this paper, a reflection upon the cognitive conflicts concerning the (lack of) understanding of these concepts.

Diagnosis and Analysis of Vasa Previa Types With Flow HD Glass Body.

To explore the value of applying flow high definition (HD) glass body in prenatal diagnosis of vasa previa and to preliminarily discuss the types of vasa previa. Two-dimensional ultrasound, flow HD, and flow HD glass body were used to image the umbilical cord insertion site and placenta, observe the cervical internal os and surrounding areas, and retrospectively analyze cases of vasa previa. There were 15 cases of vasa previa, including 14 cases of singleton pregnancies and 1 case of twin pregnancy, with a total of 22 vasa previa, including 10 veins and 12 arteries. There was 1 case with 3 vessels, 5 cases with 2 vessels, and 9 cases with a single vessel. Among them, in 3 cases of vasa previa detected at 12, 14, and 24 weeks, respectively, the vasa previa were relocated to a normal position at 24, 29, and 35 weeks of gestation when re-examined. Routine 2-dimensional ultrasound examination in this group showed tubular or circular hypoechoic areas near the cervical internal os, but vasa previa could not be confirmed. Flow HD could display color blood flow at and near the cervical internal os in 15 cases, but it was difficult to continuously show the course and source of the blood vessels under the chorion. Flow HD glass body from multiple angles could display the relationship between 15 cases of 22 vasa previa and the placenta and cervix. Combined with color Doppler blood flow spectra, flow HD glass body could determine the types of vasa previa. Flow HD glass body imaging can clearly display vasa previa, showing their origin and the spatial relationship with the cervix and placenta in a 3-dimensional manner, displaying the course and attachment points of umbilical vessels under the chorion. It can observe the area of interest at any angle, and combined with color Doppler blood flow spectra, it can judge the vasa previa of the umbilical vein, providing a more definite imaging basis for clinical management.

The future image as a component of political subjective space: testing the conceptual model

The image of the future of youth is described in this paper and its relationship with the subjective space of politics is identified. The article provides a brief analysis of research on the image of the future within the framework of social and political sciences, describes the main theoretical approaches to analyzing the future image of youth. The authors give their own conceptual definition of the future image as a component of the political subjective space, a set of symbolic, ideological and cultural meanings that determine the orientation and behavior of various political actors. The authors as a methodology use focus group interviews, online questionnaires of youth representatives in order to verify the conceptual model of the study. The dynamic nature of the future image as a part of political subjective space is determined by a system of institutions, agents and factors of socialization. Five key components have been identified in the structure of the future image: content, value, emotions, activity and technology. Four projection levels of the future image are defined: personal, group, projection at the level of the macro community and global. The study indicates the predominance of personal projection in the respondents' ideas about the future. Despite the presence of worries and fears for their personal future, young people are generally confident in their own future and believe that the Russian state will continue to play an important role as a world power. An important characteristic of the future image is the subjectivity of its bearer, the degree of activity or proactivity and the willingness to take responsibility for their own future and the future of their families, local community, region, country, and the world. Locus control, that is, a subjective assessment of the factors (personal efforts or external circumstances) on which the future depends, according to the study, is associated with the degree of confidence in the future, the formation of a positive future image. The predominance of civic identity in the hierarchy of identities is also revealed. Young people feel responsible for the future of their country. At the moment, Russian civic identity has a positive impact on the future image of young people. It is significant that among students studying in the Luhansk People's Republic, the level of concern about the future is higher, the level of civil identity is lower, which indicates that the task of forming civil identity should be prioritized in the new regions of the Russian Federation.

Small bowel adenocarcinoma of the jejunum

Jejunal adenocarcinoma is an unusual type of gastrointestinal malignancy. The symptoms are vague, such as abdominal pain, nausea, vomiting, and, in some cases, weight loss. Due to this vague presentation as well as lack of definitive imaging techniques, diagnosis tends to be delayed and patients typically present at later stages. We present a case of a patient who presented with acute onset abdominal pain. Imaging revealed the presence of a suspicious lesion of the jejunum, with a 3,6 extension. The patient underwent a laparoscopy segmental intestinal resection and omental lymph node resection. The lesion was a 3-cm mass at proximal jejunum. The jejunum adenocarcinoma is a rare neoplasm of the small bowel. The curative resection at the early stages is still the best treatment.

WP1.17 - Double Trouble - A Case of Duplex Appendix

Abstract Introduction Duplex appendix, a rare anatomical anomaly is often encountered incidentally during appendicectomy procedures. It is characterised by the presence of two appendiceal lumens and can be classified using the Cave-Wallbridge classification system. Case An 18-year-old male presents to the Emergency Department with a two-day history of migratory right iliac fossa pain. He was consented and booked for a laparoscopic appendicectomy based on clinical suspicion of acute appendicitis. Intra-operatively, an unexpected finding surfaces—a second pendunculated mass adjacent to the inflamed appendix. Employing laparoscopic linear staples, both the appendix and the adjacent mass were divided. One day post-discharge, the patient presents with severe abdominal pain and computed tomography imaging suggests an intra-abdominal leak. The patient underwent an emergency laparotomy and ileo-caecal resection overnight. Histology revealed the second pedunculated mass was indeed a second appendix, a phenomenon with a reported incidence of 0.004 to 0.009%. Discussion Addressing the nuances of using imaging modalities in the diagnosis and operative planning of acute appendicitis, our discussion raises pertinent questions regarding the necessity of definitive pre-operative imaging in suspected cases. Considering potential pitfalls of incorrect clinical diagnoses; the presence of anatomical anomalies; and other factors influencing surgical decision-making; we scrutinise the proposition of pre-operative imaging protocols in suspected acute appendicitis. Conclusively our case encapsulates the diagnostic and therapeutic conundrums posed by duplex appendix instances, prompting a deeper exploration into the use of imaging techniques in a traditionally clinically diagnosed presentation and the implications thereof in surgical management.

Comparison of Perfusion Imaging Definitions of the No-Reflow Phenomenon after Thrombectomy-What Is the Best Perfusion Imaging Definition?

We performed an external validation of 4 existing published definitions of no-reflow in thrombectomy patients with extended Thrombolysis in Cerebral Infarction scale 2c to 3 (eTICI2c-3) angiographic reperfusion who underwent 24-hour perfusion imaging from 2 international randomized controlled trials (EXTEND-IA TNK part-1 and 2) and a multicenter prospective observational study. Receiver-operating-characteristic and Bayesian-information-criterion (BIC) analyses were performed with the outcome variable being dependent-or-dead at 90-days (modified Rankin Score [mRS] ≥3). Of 131 patients analyzed, the prevalence of no-reflow significantly varied between definitions (0.8-22.1%; p < 0.001). There was poor agreement between definitions (kappa 5/6 comparisons <0.212). Among patients with no-reflow according to at least 1 definition, there were significant differences between definitions in the intralesional interside differences in cerebral blood flow (CBF) (p = 0.006), cerebral blood volume (CBV) (p < 0.001), and mean-transit-time (MTT) (p = 0.005). No-reflow defined by 3 definitions was associated with mRS ≥3 at 90 days. The definition of >15% CBV or CBF asymmetry was the only definition that improved model fit on BIC analysis (ΔBIC = -8.105) and demonstrated an association between no-reflow and clinical outcome among patients with eTICI3 reperfusion. Existing imaging definitions of no-reflow varied significantly in prevalence and post-treatment perfusion imaging profile, potentially explaining the variable prevalence of no-reflow reported in literature. The definition of >15% CBV or CBF asymmetry best discriminated for functional outcome at 90 days, including patients with eTICI3 reperfusion. ANN NEUROL 2024;96:1104-1114.

Atypical Primary Sclerosing Cholangitis Findings on a 99mTc-Mebrofenin Scan

Abstract We present an 80-year-old woman with cholestatic liver disease. Ultrasound, CT, and MR cholangiopancreatography showed no substantial findings. The patient was referred for a hepatobiliary scan to examine the physiological pathway of bilirubin and to determine for any level of obstruction. The findings on the hepatobiliary scan suggested intrinsic pathology affecting the entire biliary tree, and histology was recommended. Histology confirmed primary sclerosing cholangitis (PSC). Although hepatobiliary scintigraphy in biliary stasis is well-known and well-published, hepatobiliary scintigraphy in PSC in adults is not well-documented. The hepatobiliary scintigraphy provided the primary and definitive imaging technique in directing the management and diagnosis of PSC in our patient.

Depth-of-field enhancement in light field display based on fusion of voxel information on the depth plane

To improve the performance of 3D light field display(LFD) devices and optimize their display effects, a depth-of-field (DOF) enhancement in LFD based on fusion of voxel information on the depth plane is proposed. In previous research, a calculation method was developed to calculate the voxel size on the depth plane. According to this calculation method, a distribution model of voxel varying with display depth is established. A DOF determination criterion based on voxel distribution from visual perspective is proposed, and its accuracy is validated through subjective experiments involving multiple participants. By fusing the voxels on the depth plane, the phenomenon of voxel overlap is improved, resulting in enhanced definition of 3D images on the depth plane. Under the condition that the structure and parameters of the 3D LFD device are determined, the maximum achievable display depth will be increased significantly. Finally, experimental validation of the method's feasibility is conducted using multiple 3D light field devices for display.