Science method

Computed Tomography - Science method

Researchers that are involved in anykind of Computer Tomography Research.
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Publications related to Computed Tomography (10,000)
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Article
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Castleman disease is a rare lymphoproliferative disease commonly occurring as a benign localized mass of lymph nodes in the mediastinum. Given that Castleman disease presents as asymptomatic or through non-specific thoracic symptoms, detection is considered complex. Ultimately, surgical resection is the preferred course of action with a greater tha...
Article
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This study aims to evaluate the automated measurement of slice sensitivity profile (SSP) on the American Association of Physicists in Medicine (AAPM) computed tomography (CT) performance phantom for variations of slice thickness and field of view (FOV). The AAPM CT performance phantom was scanned using a Philips MRC 880 CT Scanner for variations of...
Article
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Incidental pathology of the skull is frequently detected on cross sectional imaging of the brain. In contrast to the common finding of hyperostosis frontalis interna, biparietal bone thinning is less common. A case of an 87-year-old woman showing coexistence of hyperostosis frontalis interna and biparietal bone thinning is presented. This coexisten...
Article
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It is extremely rare for granulomatosis with polyangiitis to form masses in the kidneys. Magnetic resonance imaging findings of renal masses caused by this disease have been infrequently reported. In this study, we report a case of renal masses caused by granulomatosis with polyangiitis with different findings. While on steroid treatment for a rece...
Article
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Epidermoid cyst is a frequently encountered cutaneous or subcutaneous cyst. Non-(sub)cutaneous epidermoid cysts are rarely found. We present a case of a 60-year-old man with an incidental mass in the left flank which turned out to be a preperitoneal located epidermoid cyst. This is, to the best of our knowledge, the first citation of an epidermoid...
Article
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Schwannomas are a type of benign tumor that affects the nerve sheath, commonly located in the head and neck. However, Schwannomas in the hepatoduodenal ligament are extremely rare. The case was a 38-year-old female presented with a 2-month history of abdominal pain in the right upper quadrant and 2 weeks of exacerbation. Computed Tomography reveale...
Article
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Omental infarction is an uncommon cause of acute abdominal pain that can occur in different several locations. We report 2 cases of omental infarction diagnosed at computed tomography (CT) scan performed as part of routine oncological surveillance, one right-sided and the other left sided. This paper illustrates the range of CT scan findings and hi...
Article
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We present the case of a 14-year-old female patient with no clinical history who was admitted due to an impact on the abdomen and pelvis with a soccer ball during a match and who developed acute post-traumatic appendicitis. Acute appendicitis is one of the most common causes of acute abdomen. The diagnosis is mainly clinical and based on definitive...
Article
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Pelvic or pelviperineal cellulitis is a rare but serious complication of bartholinitis and can be life-threatening. It is described of polymicrobial nature. The diagnosis of pelvic cellulitis remains essentially clinical with signs of local inflammation. The interest of imaging, CT in particular, is to assess the extent of the infection and abcess....
Article
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Objective: In recent years, personal identification has been performed using antemortem panoramic X-ray images and postmortem-CT images. Using these, we have developed a personal identification method that focuses on the alveolar bone. This study examined the effectiveness of this method and aimed to implement a reproducible system. Materials and...
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Quality Assessment of Computed Tomography Images using a Channelized Hoteling Observer: Optimization of Protocols in Clinical Practice
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Background: This study evaluated the feasibility of reducing the radiation dose in abdominal imaging of urolithiasis with a clinical photon-counting CT (PCCT) by gradually lowering the image quality level (IQL) without compromising the image quality and diagnostic value. Methods: Ninety-eight PCCT examinations using either IQL70 (n = 31), IQL60 (n...
Article
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Tem-se observado um crescente número de pacientes vítimas de corpos estranhos nos tecidos faciais, ainda que seja rara a ocorrência destes na língua. A remoção está frequentemente indicada e a experiência profissional com tais situações facilita o diagnóstico e abordagem. As complicações causadas pela transposição das barreiras cutâneas ou mucosas...
Article
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The breast ultrasound (US) field-of-view (FOV) includes glandular parenchyma as well as tissues located anterior to and posterior to it, up to pleural line. For that, it is possible to incidentally identify lesions unrelated to breast parenchyma during screening or diagnostic US; sometimes a palpable lump may be the reason of the imaging exam. Furt...
Article
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Nonketotic hyperglycemic hemichorea (NH-HC) is a rare condition presenting in the clinical setting. Brain imaging plays an important role in diagnosing NH-HC, which typically shows basal ganglia changes contralateral to the side of the hemiballismus/hemichorea. Only a few articles in the literature have reported normal pertinent magnetic resonance/...
Article
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Systems for retrieving and managing content-based medical images are becoming more important, especially as medical imaging technology advances and the medical image database grows. In addition, these systems can also use medical images to better grasp and gain a deeper understanding of the causes and treatments of different diseases, not just for...
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Introduction: The leftover ureteric stump after a simple nephrectomy is rarely symptomatic. Here, we report a unique case of ureteric stump stones that likely developed de novo and patients became symptomatic. Case Report: We report the case of a 53-year-old female, who had benign right nephrectomy for a non-functioning kidney 17 years ago and pres...
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The importance of developing computational thinking (CT) skills has created many practices and research. A significant amount of research exists in the literature on CT and its related skills, yet the rareness of research studies focusing on both quantitative and qualitative evaluations of students’ CT skills in real school settings is remarkable....
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Lung cancer screening (LCS) programs through low-dose Computed Tomography (LDCT) are being implemented in several countries worldwide. Radiation exposure of healthy individuals due to prolonged CT screening rounds and, eventually, the additional examinations required in case of suspicious findings may represent a concern, thus eventually reducing t...
Article
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Checkpoint inhibitor-related pneumonitis (CIP) is a complication of immunotherapy for malignant tumors that severely limits the treatment cycles as well as endangers patients’ health. The chest CT imaging features or typing of CIP and the application of radiomics will contribute to the precise prevention, early diagnosis and instant treatment of CI...
Article
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Background and Objectives: To investigate the digital measurement method for the plate trajectory of dynamic anterior plate-screw system for quadrilateral plate (DAPSQ), and then design a third-generation DAPSQ plate that conforms to the needs of the Chinese population through collating a large sample anatomical data. Materials and Methods: Firstly...
Article
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Accumulated evidence has demonstrated abnormal amygdala activation in bipolar disorder (BD). The olfactory bulb (OB) has vigorous connections with the amygdala. Although odor-related functions of the OB decreased during the evolutionary process, we hypothesized that an evolved OB with increased activation in emotion regulation may be one of the mai...
Article
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Objective The objective was to compare the recurrence rate and complications between endoscopic middle meatal antrostomy (MMA) and extended MMA for the treatment of antrochoanal polyps (ACPs). Methods and materials 95 ACPs were prospectively enrolled to undergo MMA (n = 48) or extended MMA (n = 47). The recurrence rate and complications were compa...
Article
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Aim: SARS-CoV-2 infection frequently affects the lungs, it can also cause severe inflammation in the lower respiratory tract, leading to tracheal damage. We aimed to investigate the relationship between the mean tracheal air column and COVID-19.Material and Method: Chest computed tomography scans of COVID-19 patients treated in an intensive care un...
Article
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Anti-thrombotic drugs may increase the risk for chronic subdural hematoma (CSDH). However, whether to continue or discontinue/counteract these drugs has not been investigated in patients with mild head trauma. CSDH incidence after mild head trauma, as well as the risk for CSDH in patients with anti-thrombotic drugs, were investigated in this study....
Article
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Objetivou-se analisar os casos reportados de câncer de tireoide no Brasil, associando as variáveis: faixa etária, sexo, unidade federativa (UF) do diagnóstico, ano do diagnóstico, diagnóstico detalhado e modalidade terapêutica. Dessa forma, realizou-se um estudo epidemiológico descritivo e de caráter quantitativo, utilizando os dados disponíveis no...
Article
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Maker education that incorporates computational thinking streamlines learning and helps familiarize learners with recent advances in science and technology. Computational thinking (CT) is a vital core capability that anyone can learn. CT can be learned through programming, in particular, via visual programming languages. The conclusions of most stu...
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A 24‐year‐old right‐handed male presented with a 4‐month history of migraine of weariness. Typical accompanying symptoms with migraine like nausea, vomiting, photophobia and aura were not present. Non‐contrast CT brain revealed a left sided large frontotemporoparietal (Galassi Type III) arachnoid cyst. The patient underwent a cystoperitoneal shunt.
Article
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Acute bowel diseases are responsible for more than one third of subjects who were referred to the emergency department for acute abdominal pain and gastrointestinal evaluation. Gastrointestinal ultrasound (GIUS) is often employed as the first imaging method, with a good diagnostic accuracy in the setting of acute abdomen, and it can be an optimal d...
Article
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Few-shot learning is attracting more researchers due to its outstanding ability to find unseen classes with less data. Meanwhile, we noticed that medical data is difficult to collect and label, but there is a major need for higher accuracy in either organ segmentation or disease classification. Therefore, we propose a few-shot learning model with a...
Conference Paper
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RESUMO Dentre os objetivos da Educação Ciência, Tecnologia e Sociedade (CTS) destaca-se a utilização pelos alunos de procedimentos sistemáticos de produção do conhecimento científico que permitam a construção de um novo caminho para atividades alinhadas ao educar pela pesquisa, que amplie seus conhecimentos acerca de aspectos da Natureza da Ciência...
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If meningitis is suspected, head computed tomography is performed before cerebrospinal fluid collection. Crown dens syndrome can be diagnosed using simultaneous CT scans of the head and neck. Thus, unnecessary CSF tap test can be avoided.
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There has been substantial research undertaken on the integration of computational thinking (CT) in K-12 mathematics education in recent years, particularly since 2018 when relevant systematic reviews were conducted on the topic. Many empirical studies in this area have yet to elaborate clearly and explicitly on how CT may support mathematics learn...
Article
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The aim of this study was to determine if quadriceps morphology [muscle volume (MV); cross-sectional area (CSA)], vastus lateralis (VL) muscle architecture, and muscle quality [echo intensity (ECHO)] can explain differences in knee extensor maximal voluntary isometric contraction (MVIC), crank torque (CT) and time‒to‒exhaustion (TTE) in trained cyc...
Preprint
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Anatomical information in ultrasound (US) imaging has not been exploited fully because its wave interference pattern (WIP) has been viewed as speckle noise. We tested the idea that more information can be retrieved by disentangling the WIP rather than discarding it as noise. We numerically solved the forward model of generating US images from compu...
Preprint
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Acute ischemic stroke can be subtle to detect on non-contrast computed tomography imaging. We show that a novel artificial intelligence model significantly improves the performance of physicians, including ED physicians, neurologists and radiologists, in identifying and quantifying the volume of acute ischemic stroke lesions. This model may lead to...
Article
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Frontal sinus growth is gradual and lasts until post-puberty. However, the influence of biomechanical stimuli, such as orthodontic treatment, on frontal sinus development after the growth period remains unclear. This study was designed to elucidate the impact of orthodontic treatment on the frontal sinus morphology of adult females. Sixty women wer...
Article
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A primary retroperitoneal mucinous cystadenoma should be surgically resected because of the risk of malignant transformation. However, mucinous cystadenoma of the renal parenchyma is very rare, and preoperative imaging mimics complicated renal cysts. A 72‐year‐old woman presented with a right renal mass on computed tomography that was followed up a...
Article
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Small renal masses (SRM) are increasingly detected incidentally during imaging. They vary widely in histology and aggressiveness, and include benign renal tumors and renal cell carcinomas that can be either indolent or aggressive. Imaging plays a key role in the characterization of these small renal masses. While a confident diagnosis can be made i...
Article
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Inspired by the successful application of the q‐Weibull distribution in other research fields, we took the lead to use it in the field of medical devices in this work. The parameter estimation of the q‐Weibull distribution was performed using the probability plot method. The CT failure data from Nanfang Hospital in Guangzhou, China, were used to st...
Article
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La enfermedad respiratoria aguda causada por la exposición a humos de óxido de zinc generados en el proceso de soldadura se conoce como fiebre por humos metálicos (MFF). La MFF suele ser una enfermedad autolimitada, y hay pocos reportes de neumonitis química asociada con la inhalación de humos de zinc. Reportamos un estudio de caso con episodios gr...
Article
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Marsupialisation of odontogenic cysts is a minimally invasive treatment method used in human dentistry. Marsupialisation decompresses the cyst and promotes remodeling of alveolar bone and shrinkage of the cyst. In this retrospective study we look at the effectiveness of marsupialisation at reducing the size of odontogenic cysts in dogs. The case se...
Article
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Significant rise in oncological patients everyday led to demand for 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography/computed tomography (PET/CT) scan for tumor staging, evaluation of treatment response, and monitoring/management which have become a standard of care. Basic knowledge on the physiological tracer uptakes, normal variants,...
Article
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Computed tomography (CT) is a diagnostic imaging process that uses ionising radiation to obtain information about the interior anatomic structure of the human body. Considering that the medical use of ionising radiation implies exposing patients to radiation that may lead to unwanted stochastic effects and that those effects are less probable at lo...
Article
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Intraosseous lipoma is a rare benign lesion of bone. We present a case of an intraosseous lipoma of the calcaneum detected as an incidental finding, as a well‐delineated osteolytic lesion with the central area of calcification, on plain radiography. Diagnosis can be done with a computed tomography scan and/or magnetic resonance imaging.
Article
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Recently, an extended family of power-divergence measures with two parameters was proposed together with an iterative reconstruction algorithm based on minimization of the divergence measure as an objective function of the reconstructed images for computed tomography. Numerical experiments on the reconstruction algorithm illustrated that it has adv...
Presentation
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The inspection of coiled oilfield tubing. An overview of some of my work with ultrasonics, magnetic flux leakage and eddy currents that went into a system that is used for new and used coiled tubing inspections.
Article
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The machinability of Ti-6Al-4V alloy has been a constant challenge in the industry, although the material is widely used in the aerospace and medical industries due to its mechanical properties, particularly its strength-to-weight ratio. The current research presents a hybrid laser- and ultrasonic-assisted machining (LUAM) technique to improve the...
Article
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The widespread use of cross-sectional imaging modalities, such as computed tomography (CT) and magnetic resonance imaging (MRI), in the evaluation of abdominal disorders has significantly increased the number of incidentally detected adrenal abnormalities, particularly adrenal masses [...]
Article
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Many studies have indicated a weakening in several areas of cognitive functioning associated with the normal ageing process. One of the methods supporting cognitive functions in older adults is dual-task training which is based on performing cognitive and motor exercises at the same time. The study aimed at examining the characteristics of dual-tas...
Preprint
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Purpose To evaluate the accuracy of the standardized CT value in differentiating between lipid-rich and fibrous coronary plaques and to examine the stability of its cutoff preliminarily. Methods Patients who underwent both coronary computed tomographic angiography (CCTA) and intravascular ultrasound (IVUS) were included. The CT values of the plaqu...
Article
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This study evaluates ultra-low-dose computed tomography (ULDCT) protocols concerning the detectability of pulmonary nodules. The influence of tube current settings, kernels, strength levels of third-generation iterative reconstruction algorithms, and pitch was investigated. A chest phantom with artificial spherical nodules of different densities an...
Article
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Early detection of gynecological malignancies is vital for patient management and prolonging the patient’s survival. Molecular imaging, such as positron emission tomography (PET)/computed tomography, has been increasingly utilized in gynecological malignancies. PET/magnetic resonance imaging (MRI) enables the assessment of gynecological malignancie...
Article
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Adrenal cysts are relatively rare and often asymptomatic. Surgical treatment is indicated for symptomatic cases with cysts >6 cm, suspected bleeding, and those that cannot be distinguished from malignant illness based on imaging findings. There have often been cases of giant cysts that were difficult to treat using laparoscopic surgery. A 39‐year‐o...
Article
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The purpose of this phantom study was to compare the accuracy, speed and technical performance of CT guided needle placement using a conventional technique versus a novel, gantry integrated laser guidance system for both an expert and a novice. A total of 80 needle placements were performed in an abdominal phantom using conventional CT guidance and...
Article
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Attention-deficit/hyperactivity disorder (AD/HD) is a heterogeneous neurodevelopmental condition, posing a severe threat to quality of life. Pharmacological therapies are the front-line treatment; however, their shortages encourage the development of alternative treatments for AD/HD. One promising method of developing alternative treatments is cogn...
Article
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Spontaneous and traumatic pneumothorax are most often treated with chest tube (CT) thoracostomy. However, it appears that small-bore drainage systems have similar success rates with lower complications, pain, and discomfort for the patient. We present the description of the ultrasound-guided technique for pneumothorax drainage with an 8.3-French pi...
Article
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Today’s world demands new ways of dealing with problems and different ways of preparing for them. Some studies argue that these new demands also require new skills. Critical thinking (CT) involves a set of skills that are entirely relevant to today’s adaptive needs. In this study, we explore the extent to which CT serves to both account for and imp...
Conference Paper
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Se han analizado los micromecanismos controlantes de la fractura frágil de tres aceros microaleados de forja. Los ensayos se han realizado a 77K mediante probetas CT preagrietadas por fatiga. En esas condiciones, la fractura frágil no se rige mediante modelos basados en el "weakest link", sino que se observa la presencia de puntos múltiples de inic...
Conference Paper
Full-text available
Dentre os objetivos da Educação Ciência, Tecnologia e Sociedade (CTS) destaca-se a utilização pelos alunos de procedimentos sistemáticos de produção do conhecimento científico que permitam a construção de um novo caminho para atividades alinhadas ao educar pela pesquisa, que amplie seus conhecimentos acerca de aspectos da Natureza da Ciência(NdC),...
Article
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Introdução: A Sialolitíase é uma alteração que afeta as glândulas salivares e se caracteriza pela obstrução da glândula ou de seu ducto excretor devido a formações calcificadas chamadas de sialolitos. Objetivo e relato de caso: O objetivo desse artigo é relatar um caso raro de sialolito de grandes proporções e realizar uma discussão sobre diagnósti...
Article
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Zusammenfassung Hintergrund Die moderne medizinische Bildgebung ist ein wichtiger Teil der effizienten ambulanten und stationären Patientenversorgung. Die konventionelle Röntgenaufnahme und die Computertomographie (CT) gehören zu den am häufigsten durchgeführten radiologischen Untersuchungen. Die Radiologie ermöglicht eine zielorientierte Präzisio...
Article
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Bronchiectasis is a heterogenous disease with multiple aetiologies resulting in inflammation and dilatation of the airways with associated mucus production and chronic respiratory infection. The condition is being recognised ever more frequently as the availability of computed tomography increases. It is associated with significant morbidity and he...
Article
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1 Nº 3 • diciembre 2022 ARTÍCULO DE REVISIÓN RESUMEN Recientemente se ha publicado la actualización del nuevo documento de La Iniciativa Global para la Enfer-medad Pulmonar Obstructiva Crónica (GOLD). Esta actualización ha puesto enfoque en una nueva definición de la EPOC, resaltando los diferentes factores causales y de riesgo que conlleva el desa...
Article
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Background The prevalence of coronary artery fistula (CAF) among Egyptian population is increasing due to widespread availability of coronary CT angiography using high-end CT scanners. The purpose of this observational study was to determine the incidence and types of CAF detected among Egyptian population during routinely performed coronary CT ang...