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https://www.readbyqxmd.com/read/27908164/comparison-of-low-contrast-detectability-between-two-ct-reconstruction-algorithms-using-voxel-based-3d-printed-textured-phantoms
#1
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/27907931/koronararterienanomalien-diagnostik-und-klassifikation-auf-basis-der-ct-und-mrt-des-herzens-von-alcapa-bis-terminationsanomaliecoronary-artery-anomalies-diagnosis-and-classification-based-on-cardiac-ct-and-mri-cmr-from-alcapa-to-anomalies-of-termination
#2
Philipp Heermann, Walter Heindel, Christoph Schülke
Background Coronary artery anomalies encompass a clinically and anatomically variable spectrum including physiological variants and pathophysiologically relevant anomalies. The majority of the variants has no hemodynamic relevance and is often detected accidentally. The recognition of the rare and relevant anomalies that cause either relevant shunt volumes leading to myocardial ischemia or ventricular tachyarrhythmias with the risk of sudden cardiac death is of major importance. Methods This review is based on a literature search in PubMed conducted using the key words "coronary artery" and/or "anomaly" and/or "anomalous origin" and/or "myocardial bridging" and/or "coronary artery fistula" and/or "Bland-White-Garland" and/or "ALCAPA"...
December 1, 2016: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/27878800/a-single-center-experience-of-the-implementation-of-adrenal-vein-sampling-procedure-impact-on-the-diagnostic-work-up-in-primary-aldosteronism
#3
Jacek Kądziela, Aleksander Prejbisz, Ilona Michałowska, Sylwia Kołodziejczyk-Kruk, Leo Schultze Kool, Marek Kabat, Hanna Janaszek-Sitkowska, Sadegh Toutounchi, Zbigniew Gałązka, Urszula Ambroziak, Tomasz Bednarczuk, Magdalena Januszewicz, Dorota Ptasińska-Wnuk, Michał Hoffmann, Andrzej Januszewicz, Adam Witkowski
BACKGROUND AND AIM: Primary aldosteronism (PA) is one of the most common causes of secondary hypertension. Adrenal vein sampling (AVS) remains a "gold standard" procedure in differentiation between unilateral (adenoma) and bilateral (hyperplasia) disease. We present our single-center experience in establishing and implementation of the AVS procedure. METHODS: All patients had primary aldosteronism confirmed in salt-infusion test. Adrenal vein sampling was performed sequentially during a continuous intravenous infusion of cosyntropin and was preceded by multislice contrast-enhanced computed tomography (CT) examination of adrenal glands performed few weeks before AVS in majority of patients...
November 23, 2016: Kardiologia Polska
https://www.readbyqxmd.com/read/27847694/contribution-of-low-dose-computerized-tomography-with-digital-multiplanar-reconstructions-in-thoracic-epidurography-and-correlation-with-sensory-block-in-postoperative-analgesia
#4
Cyrus Motamed, Karin Chedevergne, Frederic Deschamps, Lambros Tselikas, Christian Jayr
BACKGROUND: The level of sensory block in postoperative epidural analgesia has been correlated with conventional contrast epidurography in only one study, while low-dose CT scan epidurography with multiplanar reconstruction may be a better tool for this purpose. OBJECTIVES: The primary objective of this study was to evaluate, by CT imaging and digital multiplanar reconstruction, the spread and distribution of contrast medium injected into the epidural space through a catheter inserted in a low thoracic position for postoperative analgesia...
October 2016: Anesthesiology and Pain Medicine
https://www.readbyqxmd.com/read/27846460/coronary-risk-stratification-of-patients-undergoing-surgery-for-valvular-heart-disease
#5
Rasmus Bo Hasselbalch, Thomas Engstrøm, Mia Pries-Heje, Merete Heitmann, Frants Pedersen, Morten Schou, Hans Mickley, Hanne Elming, Rolf Steffensen, Lars Køber, Kasper Iversen
BACKGROUND: Multislice computed tomography (MSCT) is a non-invasive, less expensive, low-radiation alternative to coronary angiography (CAG) prior to valvular heart surgery. MSCT has a high negative predictive value for coronary artery disease (CAD) but previous studies of patients with valvular disease have shown that MSCT, as the primary evaluation technique, lead to re-evaluation with CAG in about a third of cases and it is therefore not recommended. If a subgroup of patients with low- to intermediate risk of CAD could be identified and examined with MSCT, it could be cost-effective, reduce radiation and the risk of complications associated with CAG...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27829015/imaging-of-orthotopic-glioblastoma-xenografts-in-mice-using-a-clinical-ct-scanner-comparison-with-micro-ct-and-histology
#6
Stefanie Kirschner, Bettina Mürle, Manuela Felix, Anna Arns, Christoph Groden, Frederik Wenz, Andreas Hug, Gerhard Glatting, Martin Kramer, Frank A Giordano, Marc A Brockmann
PURPOSE: There is an increasing need for small animal in vivo imaging in murine orthotopic glioma models. Because dedicated small animal scanners are not available ubiquitously, the applicability of a clinical CT scanner for visualization and measurement of intracerebrally growing glioma xenografts in living mice was validated. MATERIALS AND METHODS: 2.5x106 U87MG cells were orthotopically implanted in NOD/SCID/ᵞc-/- mice (n = 9). Mice underwent contrast-enhanced (300 μl Iomeprol i...
2016: PloS One
https://www.readbyqxmd.com/read/27826651/do-we-still-need-autopsy-in-times-of-modern-multislice-computed-tomography-missed-diagnoses-in-the-emergency-room
#7
S A Euler, T Kastenberger, R Attal, M Rieger, M Blauth, M Petri
INTRODUCTION: In spite of increasing quality of emergency room (ER) assessment in trauma patients and improved accuracy of modern multislice computed tomography (MSCT), the number of potentially missed diagnoses is still controversial. The aim of this study was to compare the initial findings of ER assessment and MSCT to the findings during autopsy in trauma patients not surviving the first 48 h after admission. We hypothesized that autopsy was more accurate than MSCT in diagnosing potentially fatal diagnoses...
November 8, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27822642/bone-age-estimation-based-on-multislice-computed-tomography-study-of-the-scapula
#8
Florence Nougarolis, Fatima-Zohra Mokrane, Nicolas Sans, Hervé Rousseau, Fabrice Dedouit, Norbert Telmon
Progress in medical imaging has opened new areas of research in forensic anthropology, especially in the context of the study of bone age assessment. The study of bone age has become a useful tool for age estimation at death or age of young adult migrants in an anthropological context. We retrospectively evaluated multislice computed tomography (MSCT) explorations focused on scapulae of 232 individuals (123 males; 109 females) aged between 8 and 30 years old. Computed tomography (CT) scans were viewed in axial and multiplanar reconstructed images using OsiriX 5...
November 7, 2016: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/27806588/source-modeling-for-monte-carlo-dose-calculation-of-ct-examinations-with-a-radiotherapy-treatment-planning-system
#9
Hans-Erik Källman, Rickard Holmberg, Jonas Andersson, Love Kull, Erik Tranéus, Anders Ahnesjö
PURPOSE: Radiation dose to patients undergoing examinations with Multislice Computed Tomography (MSCT) as well as Cone Beam Computed Tomography (CBCT) is a matter of concern. Risk management could benefit from efficient replace rational dose calculation tools. The paper aims to verify MSCT dose calculations using a Treatment Planning System (TPS) for radiotherapy and to evaluate four different variations of bow-tie filter characterizations for the beam model used in the dose calculations...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27803968/preoperative-3d-and-4d-ct-imaging-using-640-multislice-ct-640-msct-in-diagnosis-of-female-urethral-diverticulum
#10
Yong-Xian Zhao, Jia-Ping Wang, Jiong-Ming Li, Tao Chen, Cong-Wen Mao, Jian-He Liu, Yun-Shan Su, Ke-Wei Fang
OBJECTIVE: To determine the sensitivity and specificity of 640-Multislice CT (640-MSCT) in diagnosing the female UD. MATERIALS AND METHODS: We investigated 16 patients with symptomatic UDs preoperatively in our hospital from August 2010 to March 2016. The patients' average age was 38.8 years. All patients were performed 640-MSCT of pelvis; then, 3D and 4D images were reconstructed preoperatively. RESULTS: In 3D and 4D-CT images, out of 16 patients, thirteen patients had one ostium, two had 2 ostia and one had 3 ostia...
November 1, 2016: World Journal of Urology
https://www.readbyqxmd.com/read/27759600/scout-based-automated-tube-potential-selection-technique-kv-assist-in-enhanced-chest-computed-tomography-effects-on-radiation-exposure-and-image-quality
#11
Meng Li, Shichao Feng, Ning Wu, Li Zhang
OBJECTIVE: The aim of our study was to assess radiation dose reduction and image quality for enhanced chest CT examinations with a scout-based automated tube potential selection technique (kV Assist) compared with a standard 120-kV protocol. METHODS: Prospective study of enhanced chest CT examinations was performed in 100 consecutive patients with kV Assist and in 100 consecutive patients with conventional 120-kV protocol on a multislice CT (Discovery CT750 HD)...
October 18, 2016: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/27687953/detection-of-compressive-hydrated-nucleus-pulposus-extrusion-in-dogs-with-multislice-computed-tomography
#12
E Royaux, V Martlé, K Kromhout, E Van der Vekens, B J G Broeckx, L Van Ham, I Gielen
Compressive hydrated nucleus pulposus extrusion (HNPE) in dogs is defined as acute extradural compression by hydrated nucleus pulposus material at the level of the associated intervertebral disc. Magnetic resonance imaging (MRI) is the imaging modality of choice for diagnosis of HNPE. The aims of this study were to determine the usefulness of unenhanced computed tomography (CT) and contrast enhanced CT (CE-CT), and the sensitivity and specificity of CE-CT, for detection of compressive HNPE. Using CE-CT, HNPE was visualised as a hypodense extradural compressive lesion with rim enhancement immediately dorsal to the intervertebral disc space, with a sensitivity of 91% and a specificity of 100%...
October 2016: Veterinary Journal
https://www.readbyqxmd.com/read/27685130/method-and-phantom-to-study-combined-effects-of-in-plane-x-y-and-z-axis-resolution-for-3d-ct-imaging
#13
David Goodenough, Josh Levy, Smari Kristinsson, Jesper Fredriksson, Hildur Olafsdottir, Austin Healy
Increasingly, the advent of multislice CT scanners, volume CT scanners, and total body spiral acquisition modes has led to the use of Multi Planar Reconstruction and 3D datasets. In considering 3D resolution properties of a CT system it is important to note that both the in-plane (x,y) and z-axis (slice thickness) influence the visual-ization and detection of objects within the scanned volume. This study investigates ways to consider both the in-plane resolution and the z-axis resolution in a single phantom wherein analytic or visualized analysis can yield information on these combined effects...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27642775/efficacy-of-high-pitch-ct-protocols-for-radiation-dose-reduction
#14
N Guberina, U Lechel, M Forsting, A Ringelstein
Various strategies have been developed to reduce radiation exposure of patients in CT examinations. The aim of this study was to evaluate the efficacy of high pitch in representative CT protocols examining lung embolism. We performed thermoluminescence measurements with an anthropomorphic phantom exposing it to CT algorithms for lung embolism in a 128-multislice, dual-source CT scanner: a standard CT protocol (sCT) and a CT protocol with a high pitch (+ F). Radiation doses for both CT algorithms were compared and the dose reduction potential of high pitch for individual organs was evaluated...
September 19, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27602196/anomalous-origin-of-the-left-coronary-artery-from-the-pulmonary-artery-the-role-of-multislice-computed-tomography-msct
#15
Rashid Saif Al Umairi, Faiza Al Kindi, Fadhila Al Busaidi
Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital coronary abnormality also known as Bland-White-Garland syndrome. The incidence of ALCAPA is about 1 in every 300,000 live births, and constitutes 0.24% and 0.46% of all congenital cardiac disease. It has a high infant mortality rate reaching up to 90% if left untreated. For many years, the diagnosis of ALCAPA was by angiography or autopsy. However, multislice computed tomography (MSCT) is a non-invasive imaging tool that allows accurate, non-invasive diagnosis of ALCAPA...
September 2016: Oman Medical Journal
https://www.readbyqxmd.com/read/27588094/characteristics-and-clinical-value-of-3d-mr-imaging-in-the-diagnosis-of-pulmonary-embolism
#16
Jiashou Hu, Zhongwei Li, Yanyan Qu, Jinfeng Sun, Guowei Zhang, Guanghui Zhang
The aim of the present study was to investigate the characteristics and value of 3D dynamic contrast-enhanced magnetic resonance pulmonary angiography (3D-DCE-MRPA) for the diagnosis of pulmonary embolism (PE). Among patients suspected with PE, 30 cases were scheduled for 3D-DCE-MRPA [magnetic resonance imaging (MRI) group], and 30 cases were examined using multislice computed tomographic pulmonary angiography (msCTPA) [computed tomography (CT) group]. Direct signs including location, number, morphology of emboli, and indirect signs such as pulmonary infarction, pneumonia and pleural effusion, were analyzed...
September 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27582762/prognostic-value-of-the-ratio-between-prosthesis-area-and-indexed-annulus-area-measured-by-multislice-ct-for-transcatheter-aortic-valve-implantation-procedures
#17
Nicolas Debry, Arnaud Sudre, Ibrahim Elquodeimat, Cédric Delhaye, Guillaume Schurtz, Antoine Bical, Mohamad Koussa, Khalil Fattouch, Thomas Modine
BACKGROUND: Postprocedural aortic regurgitations following transcatheter aortic valve implantation (TAVI) procedures remain an issue. Benefit of oversizing strategies to prevent them isn't well established. We compared different level of oversizing in our cohort of consecutive patients to address if severe oversizing compared to normal sizing had an impact on post-procedural outcomes. METHODS: From January 2010 to August 2013, consecutive patients were referred for TAVI with preoperative Multislice-CT (MSCT) and the procedures were achieved using Edwards Sapien(®) or Corevalve devices(®)...
September 2016: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/27567405/assessment-of-intraoperative-3d-imaging-alternatives-for-ioert-dose-estimation
#18
Verónica García-Vázquez, Eugenio Marinetto, Pedro Guerra, Manlio Fabio Valdivieso-Casique, Felipe Ángel Calvo, Eduardo Alvarado-Vásquez, Claudio Vicente Sole, Kirby Gannett Vosburgh, Manuel Desco, Javier Pascau
Intraoperative electron radiation therapy (IOERT) involves irradiation of an unresected tumour or a post-resection tumour bed. The dose distribution is calculated from a preoperative computed tomography (CT) study acquired using a CT simulator. However, differences between the actual IOERT field and that calculated from the preoperative study arise as a result of patient position, surgical access, tumour resection and the IOERT set-up. Intraoperative CT imaging may then enable a more accurate estimation of dose distribution...
August 23, 2016: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/27553470/gallium-68-edta-pet-ct-for-renal-imaging
#19
REVIEW
Michael S Hofman, Rodney J Hicks
Nuclear medicine renal imaging provides important functional data to assist in the diagnosis and management of patients with a variety of renal disorders. Physiologically stable metal chelates like ethylenediaminetetraacetic acid (EDTA) and diethylenetriamine penta-acetate (DTPA) are excreted by glomerular filtration and have been radiolabelled with a variety of isotopes for imaging glomerular filtration and quantitative assessment of glomerular filtration rate. Gallium-68 ((68)Ga) EDTA PET usage predates Technetium-99m ((99m)Tc) renal imaging, but virtually disappeared with the widespread adoption of gamma camera technology that was not optimal for imaging positron decay...
September 2016: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/27518208/cone-beam-ct-versus-multislice-ct-radiologic-diagnostic-agreement-in-the-postoperative-assessment-of-cochlear-implantation
#20
Victor Razafindranaly, Eric Truy, Jean-Baptiste Pialat, Amanda Martinon, Magali Bourhis, Nawele Boublay, Frédéric Faure, Aïcha Ltaïef-Boudrigua
OBJECTIVE: To evaluate the diagnostic concordance between multislice computed tomography (MSCT) and cone beam computed tomography (CBCT) in the early postoperative assessment of patients after cochlear implantation. STUDY DESIGN: Prospective, randomized, single-center, interventional, pilot study on the diagnostic performance of a medical device. SETTING: Tertiary referral center. PATIENTS: Patients aged over 18 years requiring a computed tomographic (CT) scan after cochlear implant surgery...
October 2016: Otology & Neurotology
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