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https://www.readbyqxmd.com/read/28726684/low-dose-4d-cone-beam-ct-via-joint-spatiotemporal-regularization-of-tensor-framelet-and-nonlocal-total-variation
#1
Hao Han, Hao Gao, Lei Xing
Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726321/the-prevalence-of-transpancreatic-common-hepatic-artery-and-coexisting-variant-anatomy
#2
Kousei Ishigami, Akihiro Nishie, Yoshiki Asayama, Yasuhiro Ushijima, Yukihisa Takayama, Daisuke Okamoto, Nobuhiro Fujita, Tomoharu Yoshizumi, Norifumi Harimoto, Takao Ohtsuka, Kohei Nakata, Hiroshi Honda
PURPOSE: We studied the prevalence of the transpancreatic common hepatic artery (tp-CHA) and coexisting variant anatomy. MATERIALS AND METHODS: The study group comprised 788 consecutive liver transplant donor candidates who had undergone thin-section multidetector-row computed tomography (MDCT) studies to investigate vascular anatomy. Multiplanar reformatted (MPR) images obtained from the arterial phase were retrospectively reviewed to assess the presence/absence of the tp-CHA...
July 20, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28726055/an-igrt-margin-concept-for-pelvic-lymph-nodes-in-high-risk-prostate-cancer
#3
M Groher, P Kopp, M Drerup, H Deutschmann, F Sedlmayer, Frank Wolf
PURPOSE: Gold-marker-based image-guided radiation therapy (IGRT) of the prostate allows to correct for inter- and intrafraction motion and therefore to safely reduce margins for the prostate planning target volume (PTV). However, pelvic PTVs, when coadministered in a single plan (registered to gold markers [GM]), require reassessment of the margin concept since prostate movement is independent from the pelvic bony anatomy to which the lymphatics are usually referenced to. METHODS: We have therefore revisited prostate translational movement relative to the bony anatomy to obtain adequate margins for the pelvic PTVs compensating mismatch resulting from referencing pelvic target volumes to GMs in the prostate...
July 19, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28721557/the-mystery-of-a-missing-bone-revealing-the-orbitosphenoid-in-basal-epicynodontia-cynodontia-therapsida-through-computed-tomography
#4
Julien Benoit, Sandra C Jasinoski, Vincent Fernandez, Fernando Abdala
The basal non-mammaliaform cynodonts from the late Permian (Lopingian) and Early Triassic are a major source of information for the understanding of the evolutionary origin of mammals. Detailed knowledge of their anatomy is critical for understanding the phylogenetic transition toward mammalness and the paleobiological reconstruction of mammalian precursors. Using micro-computed tomography (μCT), we describe the internal morphology of the interorbital region that includes the rarely fossilized orbitosphenoid elements in four basal cynodonts...
August 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28719062/immersive-virtual-reality-as-a-teaching-tool-for-neuroanatomy
#5
Katelyn Stepan, Joshua Zeiger, Stephanie Hanchuk, Anthony Del Signore, Raj Shrivastava, Satish Govindaraj, Alfred Iloreta
BACKGROUND: Three-dimensional (3D) computer modeling and interactive virtual reality (VR) simulation are validated teaching techniques used throughout medical disciplines. Little objective data exists supporting its use in teaching clinical anatomy. Learner motivation is thought to limit the rate of utilization of such novel technologies. The purpose of this study is to evaluate the effectiveness, satisfaction, and motivation associated with immersive VR simulation in teaching medical students neuroanatomy...
July 18, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28717867/totally-laparoscopic-living-donor-left-hepatectomy-for-liver-transplantation-in-a-child
#6
Helayel Almodhaiberi, Seok-Hwan Kim, Ki-Hun Kim
BACKGROUND: Minimally invasive surgery has been validated to be a new standard in living donor hepatectomy for adult-to-pediatric transplantation with less morbidity [1]. Laparoscopic donor hepatectomy can reduce the major concerns about pain and morbidity associated with open surgery and a slow return to daily activities of donors [2]. Herein, we present one case of totally laparoscopic living donor left hepatectomy including the middle hepatic vein (MHV). DONOR AND METHOD: A 37-year-old mother volunteered to donate to her 3-year-old son with biliary atresia (PELD score 7)...
July 17, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28717635/the-fabrication-of-a-customized-occlusal-splint-based-on-the-merging-of-dynamic-jaw-tracking-records-cone-beam-computed-tomography-and-cad-cam-digital-impression
#7
Katerina Aslanidou, Chung How Kau, Christos Vlachos, Tayem Abou Saleh
OBJECTIVES: The aim of this case report was to present the procedure of fabricating a customized occlusal splint, through a revolutionary software that combines cone beam computed tomography (CBCT) with jaw motion tracking (JMT) data and superimposes a digital impression. MATERIALS AND METHODS: The case report was conducted on a 46-year-old female patient diagnosed with the temporomandibular disorder. A CBCT scan and an optical impression were obtained. The range of the patient's mandibular movements was captured with a JMT device...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28717599/improving-the-trajectory-of-transpedicular-transdiscal-lumbar-screw-fixation-with-a-computer-assisted-3d-printed-custom-drill-guide
#8
Zhen-Xuan Shao, Jian-Shun Wang, Zhong-Ke Lin, Wen-Fei Ni, Xiang-Yang Wang, Ai-Min Wu
Transpedicular transdiscal screw fixation is an alternative technique used in lumbar spine fixation; however, it requires an accurate screw trajectory. The aim of this study is to design a novel 3D-printed custom drill guide and investigate its accuracy to guide the trajectory of transpedicular transdiscal (TPTD) lumbar screw fixation. Dicom images of thirty lumbar functional segment units (FSU, two segments) of L1-L4 were acquired from the PACS system in our hospital (patients who underwent a CT scan for other abdomen diseases and had normal spine anatomy) and imported into reverse design software for three-dimensional reconstructions...
2017: PeerJ
https://www.readbyqxmd.com/read/28716518/virtual-animation-of-victim-specific-3d-models-obtained-from-ct-scans-for-forensic-reconstructions-living-and-dead-subjects
#9
C Villa, K B Olsen, S H Hansen
Post-mortem CT scanning (PMCT) has been introduced at several forensic medical institutions many years ago and has proved to be a useful tool. 3D models of bones, skin, internal organs and bullet paths can rapidly be generated using post-processing software. These 3D models reflect the individual physiognomics and can be used to create whole-body 3D virtual animations. In such way, virtual reconstructions of the probable ante-mortem postures of victims can be constructed and contribute to understand the sequence of events...
July 5, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28715319/cad-based-virtual-humans-design-and-safety-assessment-of-mri-coils
#10
Gregory M Noetscher, Nicholas D Maino, Patrick Lacroix, Marc Horner, Sara Louie
Magnetic resonance imaging (MRI) is a ubiquitous tool used in clinical settings around the world to provide detailed three-dimensional information on the internal anatomy and physiology of human patients without the use of ionizing radiation, which is the primary safety concern associated with computed tomography. This information is obtained noninvasively and can be used in the diagnosis of pathological conditions as well as the monitoring of treatments.
July 2017: IEEE Pulse
https://www.readbyqxmd.com/read/28713632/radiographic-assessment-of-the-presigmoid-retrolabyrinthine-approach
#11
Andrew K Wong, Melissa M Stamates, Anita P Bhansali, Michael Shinners, Ricky H Wong
BACKGROUND: Lesions of the petroclival fissure are difficult to access surgically. Both retrosigmoid and presigmoid retrolabyrinthine approaches have been described to successfully treat these complex tumors. The retrosigmoid approach offers quick and familiar access, whereas the presigmoid retrolabyrinthine approach reduces the operative distance and the need for cerebellar retraction. The presigmoid retrolabyrinthine approach, however, is constrained by anatomical limits that can be subject to patient variation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28712634/management-of-dens-invaginatus-type-ii-associated-with-immature-apex-and-large-periradicular-lesion-using-platelet-rich-fibrin-and-biodentine
#12
Shruti Goel, Ruchika Roongta Nawal, Sangeeta Talwar
Dens invaginatus (DI) poses peculiar challenges in endodontic treatment of teeth because of distortion of pulpal space. A case of Oehlers type II DI with open apex and large periapical lesion is reported. The case was managed using cone-beam computed tomography (CBCT), operating microscope, platelet-rich fibrin (PRF), and Biodentine. A 15-year-old male patient presented with palatal swelling. Pulp sensibility testing of right maxillary lateral incisor was negative. Intraoral periapical digital radiograph revealed an Oehlers type II DI with open apex and periapical radiolucency...
July 13, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28711209/dual-energy-computed-tomography-of-the-neck-a-pictorial-review-of-normal-anatomy-variants-and-pathologic-entities-using-different-energy-reconstructions-and-material-decomposition-maps
#13
REVIEW
Almudena Pérez-Lara, Reza Forghani
There is increasing use of dual-energy computed tomography (DECT) for the evaluation of head and neck pathologic entities. Optimal DECT utilization requires familiarity with the appearance of normal tissues variants, and pathologic entities on different DECT reconstructions that may be used in clinical practice. The purpose of this article is to provide a practical, pictorial review of the appearance of normal anatomic structures and different neoplastic and nonneoplastic head and neck pathologic entities on commonly used DECT reconstructions...
August 2017: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/28708910/influence-of-the-posterior-mandible-ridge-morphology-on-virtual-implant-planning
#14
German O Gallucci, Shirin Khoynezhad, Alfa I Yansane, Jacob Taylor, Daniel Buser, Bernard Friedland
PURPOSE: The purpose of this study was to examine the anatomy of the mandibular posterior region to develop an anatomical categorization for implant-prosthodontic planning. MATERIALS AND METHODS: Using cone beam computed tomography scans, 313 cross-sectional views of edentulous posterior mandibular sites were evaluated with respect to the anatomical ridge morphology. Virtual implant planning was performed, and the need for bone grafting was assessed. The level of complexity for planning implants in those positions was assessed...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28705329/relationship-between-cone-beam-ct-technique-and-diagnostic-usefulness-in-patients-undergoing-embolotherapy-for-hepatocellular-carcinoma
#15
D Gutierrez, R Kishore Gurajala, B Kapoor, R Setser, K Karuppasamy
AIM: To determine the effect of different numbers of projection images in C-arm cone-beam computed tomography (CBCT) on diagnostic content and image quality in patients undergoing angiographic embolotherapy for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: A total of 29 patients who underwent contrast-enhanced conventional multidetector CT (MDCT) within 6 weeks prior to CBCT acquired during embolotherapy for HCC between 2010 and 2013 were included in the study...
July 10, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28704342/a-novel-compact-small-field-of-view-hybrid-gamma-camera-first-clinical-results
#16
Aik H Ng, Patricia E Blackshaw, Mohammed S Alqahtani, Layal K Jambi, Sarah L Bugby, John E Lees, Alan C Perkins
INTRODUCTION: Hybrid imaging has proven to be a major innovation in nuclear medicine, allowing the fusion of functional information with anatomical detail. In the past, the use of hybrid imaging such as PET-CT, PET-MRI and SPECT-CT has been of great clinical benefit; however, these scanners are relatively large and bulky. We have developed and investigated the clinical application of a compact small field of view hybrid gamma camera (HGC) that is suitable for small-organ imaging at the patient bedside...
July 12, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28702479/image-quality-and-contrast-agent-exposure-in-cardiac-computed-tomography-angiography-prior-to-transcatheter-aortic-valve-implantation-procedures-using-different-acquisition-protocols
#17
Nina P Hofmann, Moritz Schuetz, Raffi Bekeredjian, Sven Pleger, Emanuel Chorianopoulos, Sorin Giusca, Florian André, Gitsios Gitsioudis, Christopher Schlett, Hans-Ulrich Kauczor, Hugo A Katus, Grigorios Korosoglou
BACKGROUND: ECG-gated cardiac computed tomography angiography (CCTA) has found widespread use for prosthesis sizing before transcatheter aortic valve implantation (TAVI). However, still little data exists on the optimal scan-strategy in such patients. We hypothesized that prospectively triggered CCTA can enable the visualization of aortic valve structures and peripheral arteries with lower radiation and contrast agent exposure in patients considered for TAVI compared to retrospectively gated protocols...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/28692497/the-safety-and-accuracy-of-surgical-navigation-technology-in-the-treatment-of-lesions-involving-the-skull-base
#18
Bin Wei, Guowen Sun, Qingang Hu, Enyi Tang
OBJECTIVE: As compared with the normal anatomy, structures of the skull base and its surroundings have been dramatically altered of the lesion near the skull base. How to remove the lesion at the skull base was mainly depending on surgeon's personal experience during past years. In this study, the authors explored the safety and accuracy of the surgical navigation system in resecting lesions near the skull base. METHODS: The surgical cases consisted of 15 patients who underwent surgery involving the skull base with the using of surgical navigation technology...
July 7, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28687426/quantitative-imaging-analysis-of-transcanal-endoscopic-infracochlear-approach-to-the-internal-auditory-canal
#19
Judith S Kempfle, Benjamin Fiorillo, Vivek V Kanumuri, Samuel Barber, Albert S B Edge, Marybeth Cunnane, Aaron K Remenschneider, Daniel J Lee, Elliott D Kozin
PURPOSE: A transcanal endoscopic infracochlear surgical approach to the internal auditory canal (IAC) in a human temporal bone model has previously been described. However, the proportion of patients with favorable anatomy for this novel surgical technique remains unknown. Herein, we perform a quantitative analysis of the transcanal endoscopic infracochlear corridor to the IAC based on computed tomography. MATERIALS AND METHODS: High resolution computed tomography scans of adult temporal bones were measured to determine the accessibility of the IAC when using an endoscopic transcanal, cochlear-sparing surgical corridor...
April 4, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28683847/paediatric-orbital-cellulitis-and-the-relationship-to-underlying-sinonasal-anatomy-on-computed-tomography
#20
R A Crosbie, W A Clement, H Kubba
OBJECTIVE: To assess if there is an association between sinonasal anatomical variants and the risk of developing orbital cellulitis and associated complications, in children. METHODS: A retrospective case-control series was conducted, examining computed tomography confirmed sinonasal anatomical variants of septal deviation and concha bullosa in children who presented with periorbital cellulitis who went on to develop orbital cellulitis and abscesses. RESULTS: Thirty children had a Chandler score of 2 or greater on computed tomography...
July 7, 2017: Journal of Laryngology and Otology
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