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Anatomical segmentation

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https://www.readbyqxmd.com/read/27909801/increasing-the-sensitivity-of-mri-for-the-detection-of-multiple-sclerosis-lesions-by-long-axial-coverage-of-the-spinal-cord-a-prospective-study-in-119-patients
#1
Michael O Breckwoldt, Johann Gradl, Stefan Hähnel, Thomas Hielscher, Brigitte Wildemann, Ricarda Diem, Michael Platten, Wolfgang Wick, Sabine Heiland, Martin Bendszus
Diagnostic imaging criteria of multiple sclerosis (MS) include the spatial and temporal dissemination of cerebral and/or spinal cord lesions. Magnetic resonance imaging (MRI) is the method of choice for initial diagnosis and follow-up disease monitoring. Current guidelines for spinal MRI recommend sagittal imaging of the spinal cord and lesion confirmation on axial planes if lesions are detected. Sagittal imaging is, however, hampered by technical (e.g. partial volume effects, motion artifacts) and anatomical (e...
December 1, 2016: Journal of Neurology
https://www.readbyqxmd.com/read/27908824/arteriographic-patterns-of-atherosclerosis-and-the-association-between-diabetes-mellitus-and-ethnicity-in-chronic-critical-limb-ischemia
#2
Jayer Chung, J Gregory Modrall, Martyn Knowles, Qun Xiang, Lawrence A Lavery, Carlos H Timaran, R James Valentine
BACKGROUND: Disparate outcomes in critical limb ischemia (CLI) persist between ethnicities. The contribution of modifiable factors versus intrinsic biologic differences remains unclear. Hence, we aimed to quantify the associations between ethnicity and anatomic patterns of arterial occlusive disease in CLI, adjusting for known atherosclerotic risk factors. METHODS: We performed a retrospective, single-center review of consecutive patients presenting to the vascular surgery service with CLI...
November 28, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27908816/blunt-traumatic-occlusion-of-the-common-iliac-artery-repaired-with-segmental-excision-and-internal-iliac-artery-patch-angioplasty
#3
Abid C Mogannam, Robert F Cubas, Ivan M Gutierrez, Juan A Astudillo, Ahmed M Abou-Zamzam
Common iliac artery (CIA) occlusion as a result of blunt trauma is rare and seldom reported. This has been associated with pelvic fractures and other great vessel lesions. Management options include endovascular covered stent placement, open anatomic repair with autogenous conduit, or open extra-anatomic repair with prosthetic material. We report the case of a middle-aged male with a right CIA injury secondary to blunt trauma who underwent a successful repair using an internal iliac artery (IIA) patch for injury to a 2 cm segment of CIA with peritoneal contamination...
November 28, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27908164/comparison-of-low-contrast-detectability-between-two-ct-reconstruction-algorithms-using-voxel-based-3d-printed-textured-phantoms
#4
Justin Solomon, Alexandre Ba, François Bochud, Ehsan Samei
PURPOSE: To use novel voxel-based 3D printed textured phantoms in order to compare low-contrast detectability between two reconstruction algorithms, FBP (filtered-backprojection) and SAFIRE (sinogram affirmed iterative reconstruction) and determine what impact background texture (i.e., anatomical noise) has on estimating the dose reduction potential of SAFIRE. METHODS: Liver volumes were segmented from 23 abdominal CT cases. The volumes were characterized in terms of texture features from gray-level co-occurrence and run-length matrices...
December 2016: Medical Physics
https://www.readbyqxmd.com/read/27907080/development-of-an-automated-mri-based-diagnostic-protocol-for-amyotrophic-lateral-sclerosis-using-disease-specific-pathognomonic-features-a-quantitative-disease-state-classification-study
#5
Christina Schuster, Orla Hardiman, Peter Bede
BACKGROUND: Despite significant advances in quantitative neuroimaging, the diagnosis of ALS remains clinical and MRI-based biomarkers are not currently used to aid the diagnosis. The objective of this study is to develop a robust, disease-specific, multimodal classification protocol and validate its diagnostic accuracy in independent, early-stage and follow-up data sets. METHODS: 147 participants (81 ALS patients and 66 healthy controls) were divided into a training sample and a validation sample...
2016: PloS One
https://www.readbyqxmd.com/read/27904724/analysis-of-sacrococcygeal-morphology-in-koreans-using-computed-tomography
#6
Min Geun Yoon, Myung-Sang Moon, Bong Keun Park, Hohyoung Lee, Dong-Hyeon Kim
BACKGROUND: The sacrococcygeal morphology of Arabs and Europeans has been studied using computed tomography (CT) or magnetic resonance imaging to determine the cause of coccydynia. Studies have suggested differences in sacrococcygeal morphology among ethnic groups. However, there are no data on the sacrococcygeal anatomy of Koreans. METHODS: We conducted a retrospective analysis of 606 pelvic CT scans that were taken at Cheju Halla General Hospital between 2008 and 2014...
December 2016: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/27903374/-the-relationship-between-myocardial-bridge-in-mural-coronary-artery-segment-and-coronary-atherosclerosis
#7
S J Ding, R C Huang, C F Jia, L Zhong, P An, Z Q Wang, H Zhu, B L Wu, X C Zhou
Objective: The myocardial bridging (MB) prevalence, anatomic characteristics of MB, and the relationship between characteristics of MB in mural coronary artery segment and coronary atherosclerosis were analyzed. Methods: In this perspective nonrandomized controlled study, a total of 1 132 patients who admitted to our hospital for suspected or known coronary artery disease from January 2012 to June 2013 were enrolled. All patients underwent dual-source 64-slice spiral CT coronary angiography. The general patient characteristics including gender, age, history of hypertension, diabetes, hyperlipidemia and smoking, serum level of total cholesterol (TC) and LDL-C were recorded...
October 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27903195/dosimetric-effects-of-onyx-embolization-on-gamma-knife-arteriovenous-malformation-dose-distributions
#8
David J Schlesinger, Håkan Nordström, Anders Lundin, Zhiyuan Xu, Jason P Sheehan
OBJECTIVE Patients with arteriovenous malformations (AVMs) treated with Gamma Knife radiosurgery (GKRS) subsequent to embolization suffer from elevated local failure rates and differences in adverse radiation effects. Onyx is a common embolic material for AVMs. Onyx is formulated with tantalum, a high atomic number (Z = 73) element that has been investigated as a source of dosimetric uncertainty contributing to the less favorable clinical results. However, prior studies have not modeled the complicated anatomical and beam geometries characteristic of GKRS...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27900929/main-effects-and-interactions-of-cerebral-hemispheres-gender-and-age-in-the-calculation-of-volumes-and-asymmetries-of-selected-structures-of-episodic-memory
#9
Rocio Ramirez-Carmona, Haydee Guadalupe Garcia-Lazaro, Brenda Dominguez-Corrales, Erika Aguilar-Castañeda, Ernesto Roldan-Valadez
The aim of this study was to clarify the influence of anatomical (cerebral hemisphere) and demographic (age and gender) variables on the gray matter (GM) volumes and volumetric asymmetry indices (VAIs) of selected structures involved in episodic memory. A cross-sectional study was performed in 47 healthy volunteers. Neuropsychological evaluation revealed similar IQs across the sample. Using SPM-based software, brain segmentation, labeling and volume measurements of the hippocampus, amygdala, middle temporal gyrus and parahippocampal gyrus were performed in each cerebral hemisphere...
November 30, 2016: Functional Neurology
https://www.readbyqxmd.com/read/27897128/defining-the-limits-of-endoscopic-access-to-internal-auditory-canal
#10
Adam Master, Mickie Hamiter, Maura Cosetti
OBJECTIVE: To quantify surgical access to the internal auditory canal (IAC) using an exclusively endoscopic transcanal approach (EETA) and investigate surgically relevant relationships with neurovascular and osseous landmarks of the temporal bone. MATERIALS AND METHODS: Anatomical dissection of two paired temporal bones and 15 unpaired temporal bones was performed using an exclusively endoscopic approach to IAC. The dissection proceeded until the cerebellopontine angle (CPA) could be accessed...
November 28, 2016: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/27896540/variations-in-the-anatomy-of-the-vertebral-artery-cervical-loop-segment-a-potential-predisposing-factor-for-traumatic-basal-subarachnoid-hemorrhage
#11
Jonathan E Medcalf, C Paul Johnson, Azzam Taktak, Silke Grabherr
Fatal traumatic basal subarachnoid hemorrhage (TBSAH) is a characteristic forensic pathological entity, the investigation of which requires special techniques. In Liverpool, post-mortem room angiography is undertaken, followed by complete removal of the vertebral arteries and histological examination. It has been observed that the arterial anatomy can be highly variable, particularly the length and course of the loop segments located between the C2 vertebra and the dura. In a number of cases of TBSAH the loop segments of torn vessels have appeared relatively short...
November 29, 2016: Forensic Science, Medicine, and Pathology
https://www.readbyqxmd.com/read/27896373/assessing-colonic-anatomy-normal-values-based-on-air-contrast-enemas-in-children-younger-than-6%C3%A2-years
#12
Ilan J N Koppen, Desale Yacob, Carlo Di Lorenzo, Miguel Saps, Marc A Benninga, Jennifer N Cooper, Peter C Minneci, Katherine J Deans, D Gregory Bates, Benjamin P Thompson
BACKGROUND: Contrast enemas with barium or water-soluble contrast agents are sometimes performed in children with severe intractable constipation to identify anatomical abnormalities. However there are no clear definitions for normal colonic size or abnormalities such as colonic dilation or sigmoid redundancy in children. OBJECTIVE: To describe characteristics of colonic anatomy on air contrast enemas in children without constipation to provide normal values for colonic size ratios in children...
November 29, 2016: Pediatric Radiology
https://www.readbyqxmd.com/read/27895960/automatic-four-chamber-segmentation-using-level-set-method-and-split-energy-function
#13
Ho Chul Kang, Jeongjin Lee, Juneseuk Shin
OBJECTIVES: In this paper, we present an automatic method to segment four chambers by extracting a whole heart, separating the left and right sides of the heart, and spliting the atrium and ventricle regions from each heart in cardiac computed tomography angiography (CTA) efficiently. METHODS: We smooth the images by applying filters to remove noise. Next, the volume of interest is detected by using k-means clustering. In this step, the whole heart is coarsely extracted, and it is used for seed volumes in the next step...
October 2016: Healthcare Informatics Research
https://www.readbyqxmd.com/read/27894542/effect-of-orthodontic-treatment-on-the-upper-airway-volume-in-adults
#14
Benjamin T Pliska, Isaac T Tam, Alan A Lowe, Alisa M Madson, Fernanda R Almeida
INTRODUCTION: The aim of this study was to examine the effects of orthodontic treatment with and without extractions on the anatomic characteristics of the upper airway in adults. METHODS: For this retrospective study, the pretreatment and posttreatment cone-beam computed tomography scans of 74 adult patients meeting defined eligibility criteria were analyzed. Imaging software was used to segment and measure upper airway regions including the nasopharynx, the retropalatal, and retroglossal areas of the oropharynx, as well as the total airway...
December 2016: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/27893097/benefit-of-measuring-anterior-segment-structures-using-an-increased-number-of-optical-coherence-tomography-images-the-chinese-american-eye-study
#15
Benjamin Y Xu, Paul Israelsen, Billy X Pan, Dandan Wang, Xuejuan Jiang, Rohit Varma
Purpose: The purpose of this study was to evaluate the benefit of analyzing an increased number of anterior segment optical coherence tomography (AS-OCT) images on measurement values of various anterior segment parameters. Methods: Subjects for this cross-sectional study were recruited from the Chinese American Eye Study (CHES), a population-based study in Los Angeles, CA. Thirty-two AS-OCT images were acquired from one eye each of 83 consecutive subjects. Sixteen parameters were analyzed in each image, including angle opening distance (AOD), angle recess area (ARA), trabecular iris space area (TISA), trabecular iris angle (TIA), scleral spur angle (SSAngle), lens vault (LV), pupillary diameter (PD), anterior chamber depth (ACD), anterior chamber width (ACW), iris area (IA), and anterior chamber area (ACA)...
November 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27891670/biomechanical-behavior-of-novel-composite-pmma-cap-bone-cements-in-an-anatomically-accurate-cadaveric-vertebroplasty-model
#16
Shant Aghyarian, Xiaobang Hu, Ram Haddas, Isador H Lieberman, Victor Kosmopoulos, Harry K W Kim, Danieli C Rodrigues
Vertebral compression fractures are caused by many factors including trauma and osteoporosis. Osteoporosis induced fractures are a result of loss in bone mass and quality that weaken the vertebral body. Vertebroplasty and kyphoplasty, involving cement augmentation of fractured vertebrae, show promise in restoring vertebral mechanical properties. Some complications however, are reported due to the performance characteristics of commercially available bone cements. In this study, the biomechanical performance characteristics of two novel composite (PMMA-CaP) bone cements were studied using an anatomically accurate human cadaveric vertebroplasty model...
November 27, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27891516/functional-region-annotation-of-liver-ct-image-based-on-vascular-tree
#17
Yufei Chen, Xiaodong Yue, Caiming Zhong, Gang Wang
Anatomical analysis of liver region is critical in diagnosis and treatment of liver diseases. The reports of liver region annotation are helpful for doctors to precisely evaluate liver system. One of the challenging issues is to annotate the functional regions of liver through analyzing Computed Tomography (CT) images. In this paper, we propose a vessel-tree-based liver annotation method for CT images. The first step of the proposed annotation method is to extract the liver region including vessels and tumors from the CT scans...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27890842/treatment-of-a-patient-with-abdominal-aortic-aneurysm-and-hepatocelular-carcinoma
#18
Slobodan Cvetkovic, Igor Koncar, Daniel Galun, Jelena Ribac, Miroslav Markovic, Nikola Ilic, Marko Dragas, Lazar Davidovic
INTRODUCTION: The surgical tactics in cases of AAA and intra-abdominal malignancy are not uniform in the literature and are still a matter of debate. CASE REPORT: In this case report, we present a patient with coexisting AAA and primary liver cancer managed by simultaneous open AAA repair and liver resection After laparotomy and intraoperative liver ultrasonography that confirmed resectability of the tumor, aneurysm repair was performed with aorto-aortic tube grafting after interrenal cross-clamping Radiofrequency-assisted liver transection was performed to complete an anterior anatomic resection of liver segments VI and VII...
November 24, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27888604/mri-depiction-and-3d-visualization-of-three-anterior-cruciate-ligament-bundles
#19
H Otsubo, Y Akatsuka, H Takashima, T Suzuki, D Suzuki, T Kamiya, Y Ikeda, T Matsumura, T Yamashita, K Shino
The anterior cruciate ligament (ACL) is divided into three fiber bundles (AM-M: anteromedial-medial, AM-L: anteromedial-lateral, PL: posterolateral). We attempted to depict the three bundles of the human ACL on MRI images and to obtain 3-dimensional visualization of them. Twenty-four knees of healthy volunteers (14 males, 10 females) were scanned by 3T-MRI using the fat suppression 3D coherent oscillatory state acquisition for the manipulation of imaging contrast (FS 3D-COSMIC). The scanned images were reconstructed after the isotropic voxel data, which allows the images to be reconstructed in any plane, was acquired...
November 26, 2016: Clinical Anatomy
https://www.readbyqxmd.com/read/27888599/a-rare-anomaly-of-duodenum-a-case-report
#20
Rekha Lalwani, Sunita Athavale, Sheetal Kotgirwar
 Anatomical variations of duodenum such as atresia, stenosis, and variations in shape have been described by various authors, but the existence of a gross anomaly in shape and position of midgut segment of the duodenum is rare. Few reported cases of duodenal anomalies date back to early twentieth century. In the wake of advancement of imaging techniques and minimal access surgeries, authors report a case of a rare duodenal anomaly. The reported case assumes significance because of thepossibility of misinterpretation of radiological images which has been discussed while citing such references...
October 2016: Acta Medica Iranica
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