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CT imaging, increasing accuracy

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https://www.readbyqxmd.com/read/28212047/multimaterial-decomposition-algorithm-for-the-quantification-of-liver-fat-content-by-using-fast-kilovolt-peak-switching-dual-energy-ct-clinical-evaluation
#1
Tomoko Hyodo, Norihisa Yada, Masatoshi Hori, Osamu Maenishi, Peter Lamb, Kosuke Sasaki, Minori Onoda, Masatoshi Kudo, Teruhito Mochizuki, Takamichi Murakami
Purpose To assess the clinical accuracy and reproducibility of liver fat quantification with the multimaterial decomposition (MMD) algorithm, comparing the performance of MMD with that of magnetic resonance (MR) spectroscopy by using liver biopsy as the reference standard. Materials and Methods This prospective study was approved by the institutional ethics committee, and patients provided written informed consent. Thirty-three patients suspected of having hepatic steatosis underwent non-contrast material-enhanced and triple-phase dynamic contrast-enhanced dual-energy computed tomography (CT) (80 and 140 kVp) and single-voxel proton MR spectroscopy within 30 days before liver biopsy...
February 17, 2017: Radiology
https://www.readbyqxmd.com/read/28211634/prediction-of-forearm-bone-shape-based-on-partial-least-squares-regression-from-partial-shape
#2
Keiichiro Oura, Yoshito Otake, Atsuo Shigi, Futoshi Yokota, Tsuyoshi Murase, Yoshinobu Sato
BACKGROUND: Computer-assisted corrective osteotomy using a mirror image of the normal contralateral shape as reference is increasingly used. Instead, we propose to use the shape predicted by statistical learning to deal with cases demonstrating bilateral abnormality, such as bilateral trauma, congenital disease, and metabolic disease. METHODS: Computed tomography (CT) scans of 100 normal forearms were used in this study. The whole bone shape was predicted from its partial shape based on statistical learning of the other 99 bones...
February 17, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28187933/clinical-usefulness-of-abdominal-bioimpedance-viscan-in-the-determination-of-visceral-fat-and-its-application-in-the-diagnosis-and-management-of-obesity-and-its-comorbidities
#3
Javier Gómez-Ambrosi, Ignacio González-Crespo, Victoria Catalán, Amaia Rodríguez, Rafael Moncada, Víctor Valentí, Sonia Romero, Beatriz Ramírez, Camilo Silva, María J Gil, Javier Salvador, Alberto Benito, Inmaculada Colina, Gema Frühbeck
BACKGROUND & AIMS: Visceral adipose tissue (VAT) has been shown to be profoundly responsible of most of the obesity-associated metabolic derangements. The measurement of VAT usually implies the use of imaging techniques such as magnetic resonance imaging or computed tomography (CT). Our aim was to evaluate the accuracy of the determination of VAT by means of abdominal bioimpedance (BIA) with the ViScan device in comparison with CT and its clinical usefulness in the management of obesity...
January 28, 2017: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28185782/acute-pulmonary-embolism-detection-with-ventilation-perfusion-spect-combined-with-full-dose-ct-what-is-the-best-option
#4
M Milà, J Bechini, A Vázquez, V Vallejos, M Tenesa, A Espinal, M Fraile, M Monreal
AIM: To compare diagnostic accuracy of Ventilation/Perfusion (V/P) single-photon emission computed tomography (SPECT) combined with simultaneous full-dose CT with a hybrid SPECT/CT scanner versus planar ventilation/perfusion (V/P) SPECT and CT angiography (CTA) in patients suspected with acute pulmonary embolism (PE). METHODS: Between 2009 and 2011, consecutive patients suspected of acute PE were referred for V/P SPECT/CT (reviewed board approved study). A contrast agent was administered to patients who had no contraindications...
February 6, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28181789/a-novel-image-processing-technique-for-three-dimensional-volumetric-analysis-of-severely-resorbed-alveolar-sockets-with-cone-beam-computed-tomography
#5
Valeria Manavella, Federica Romano, Federica Garrone, Mara Terzini, Cristina Bignardi, Mario Aimetti
BACKGROUND: The aim of this study was to present and validate a novel procedure for the quantitative volumetric assessment of extraction sockets that combines Cone-Beam Computed Tomography (CBCT) and image processing techniques. METHODS: The CBCT dataset of 9 severely resorbed extraction sockets was analyzed by means of two image processing software, Image J and Mimics, using manual and automated segmentation techniques. They were also applied on 5 mm spherical aluminum markers of known volume and on a polyvinyl chloride model of one alveolar socket scanned with Micro-CT to test the accuracy...
February 9, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28181479/multi-atlas-attenuation-correction-supports-full-quantification-of-static-and-dynamic-brain-pet-data-in-pet-mr
#6
Ines Merida, Anthonin Reilhac, Jerome Redoute, Rolf Heckemann, Nicolas Costes, Alexander Hammers
Introduction In simultaneous PET-MR, attenuation maps are not directly available. Essential for absolute radioactivity quantification, they need to be derived from MR or PET data to correct for gamma photon attenuation by the imaged object. We evaluate a multi-atlas attenuation correction method for brain imaging (MaxProb) on static [18F]FDG PET and, for the first time, on dynamic PET, using the serotoninergic tracer [18F]MPPF. Methods A database of 40 MR/CT image pairs (atlases) was used. The MaxProb method synthesises subject-specific pseudo-CTs by registering each atlas to the target subject space...
February 9, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28170300/effect-of-radiation-dose-reduction-and-reconstruction-algorithm-on-image-noise-contrast-resolution-and-detectability-of-subtle-hypoattenuating-liver-lesions-at-multidetector-ct-filtered-back-projection-versus-a-commercial-model-based-iterative-reconstruction
#7
Justin Solomon, Daniele Marin, Kingshuk Roy Choudhury, Bhavik Patel, Ehsan Samei
Purpose To determine the effect of radiation dose and iterative reconstruction (IR) on noise, contrast, resolution, and observer-based detectability of subtle hypoattenuating liver lesions and to estimate the dose reduction potential of the IR algorithm in question. Materials and Methods This prospective, single-center, HIPAA-compliant study was approved by the institutional review board. A dual-source computed tomography (CT) system was used to reconstruct CT projection data from 21 patients into six radiation dose levels (12...
February 7, 2017: Radiology
https://www.readbyqxmd.com/read/28168681/normal-model-construction-for-statistical-image-analysis-of-torso-fdg-pet-images-based-on-anatomical-standardization-by-ct-images-from-fdg-pet-ct-devices
#8
Kenshiro Takeda, Takeshi Hara, Xiangrong Zhou, Tetsuro Katafuchi, Masaya Kato, Satoshi Ito, Keiichi Ishihara, Shinichiro Kumita, Hiroshi Fujita
PURPOSE: A better understanding of the standardized uptake value (SUV) ranges of fludeoxyglucose positron emission tomography (FDG-PET) is crucial for radiologists. We have developed a statistical image analysis method for FDG-PET imaging of the torso, based on comparisons with normal data. The purpose of this study was to verify the accuracy of the normal model and usefulness of the statistical image analysis method by using typical cancer cases in the liver, lungs, and abdomen. METHODS: Our study and the data collection (49 normal and 34 abnormal cases, in terms of PET/CT findings) were approved by the institutional review board...
February 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28168514/limits-of-the-possible-diagnostic-image-quality-in-coronary-angiography-with-third-generation-dual-source-ct
#9
Marco M Ochs, Fabian Aus dem Siepen, Thomas Fritz, Florian Andre, Gitsios Gitsioudis, Grigorios Korosoglou, Sebastian Seitz, Yuriy Bogomazov, Christopher L Schlett, Roman Sokiranski, Andre Sommer, Friedemann Gückel, Matthias Brado, Hans-Ulrich Kauczor, Johannes Görich, Matthias G W Friedrich, Hugo A Katus, Sebastian J Buss
BACKGROUND: The usage of coronary CT angiography (CTA) is appropriate in patients with acute or chronic chest pain; however the diagnostic accuracy may be challenged with increased Agatston score (AS), increased heart rate, arrhythmia and severe obesity. Thus, we aim to determine the potential of the recently introduced third-generation dual-source CT (DSCT) for CTA in a 'real-life' clinical setting. METHODS: Two hundred and sixty-eight consecutive patients (age: 67 ± 10 years; BMI: 27 ± 5 kg/m²; 61% male) undergoing clinically indicated CTA with DSCT were included in the retrospective single-center analysis...
February 6, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/28168368/accuracy-of-iodine-quantification-using-dual-energy-ct-in-latest-generation-dual-source-and-dual-layer-ct
#10
Gert Jan Pelgrim, Robbert W van Hamersvelt, Martin J Willemink, Bernhard T Schmidt, Thomas Flohr, Arnold Schilham, Julien Milles, Matthijs Oudkerk, Tim Leiner, Rozemarijn Vliegenthart
OBJECTIVE: To determine the accuracy of iodine quantification with dual energy computed tomography (DECT) in two high-end CT systems with different spectral imaging techniques. METHODS: Five tubes with different iodine concentrations (0, 5, 10, 15, 20 mg/ml) were analysed in an anthropomorphic thoracic phantom. Adding two phantom rings simulated increased patient size. For third-generation dual source CT (DSCT), tube voltage combinations of 150Sn and 70, 80, 90, 100 kVp were analysed...
February 6, 2017: European Radiology
https://www.readbyqxmd.com/read/28164254/utility-of-18f-sodium-fluoride-pet-ct-imaging-in-the-evaluation-of-postoperative-pain-following-surgical-spine-fusion
#11
D Pouldar, S Bakshian, R Matthews, V Rao, M Manzano, S Dardashti
STUDY DESIGN: A retrospective case review of patients who underwent 18F sodium fluoride PET/CT imaging of the spine with postoperative pain following vertebral fusion. OBJECTIVE: To determine the benefit of 18F sodium fluoride PET/CT imaging in the diagnosis of persistent pain in the postoperative spine. The diagnosis of pain generators in the postoperative spine has proven to be a diagnostic challenge. The conventional radiologic evaluation of persistent pain after spine surgery with the use of plain radiographs, MRI, and CT can often fall short of diagnosis in the complex patient...
February 6, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28130050/3d-printing-of-preoperative-simulation-models-of-a-splenic-artery-aneurysm-precision-and-accuracy
#12
Hidemasa Takao, Shiori Amemiya, Eisuke Shibata, Kuni Ohtomo
RATIONALE AND OBJECTIVES: Three-dimensional (3D) printing is attracting increasing attention in the medical field. This study aimed to apply 3D printing to the production of hollow splenic artery aneurysm models for use in the simulation of endovascular treatment, and to evaluate the precision and accuracy of the simulation model. MATERIALS AND METHODS: From 3D computed tomography (CT) angiography data of a splenic artery aneurysm, 10 hollow models reproducing the vascular lumen were created using a fused deposition modeling-type desktop 3D printer...
January 24, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28127678/gallbladder-adenomyomatosis-imaging-findings-tricks-and-pitfalls
#13
REVIEW
Matteo Bonatti, Norberto Vezzali, Fabio Lombardo, Federica Ferro, Giulia Zamboni, Martina Tauber, Giampietro Bonatti
: Gallbladder adenomyomatosis (GA) is a benign alteration of the gallbladder wall that can be found in up to 9% of patients. GA is characterized by a gallbladder wall thickening containing small bile-filled cystic spaces (i.e., the Rokitansky-Aschoff sinuses, RAS). The bile contained in RAS may undergo a progressive concentration process leading to crystal precipitation and calcification development. A correct characterization of GA is fundamental in order to avoid unnecessary cholecystectomies...
January 26, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/28125294/effects-of-exposure-parameters-and-slice-thickness-on-detecting-clear-and-unclear-mandibular-canals-using-cone-beam-ct
#14
Gainer R Jasa, Mayumi Shimizu, Kazutoshi Okamura, Kenji Tokumori, Yohei Takeshita, Warangkana Weerawanich, Kazunori Yoshiura
: Objectives The purpose of this study was to clarify the effects of exposure parameters and image processing methods when using cone beam CT (CBCT) to detect clear and unclear mandibular canals (MCs). Methods Twenty-four dry half mandibles were divided into two groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60, 70, and 90 kV; and tube currents 2, 5, 10 and 15 mA) to obtain a total of 144 scans...
January 26, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28124061/microfluidic-coagulation-assay-for-monitoring-anticoagulant-therapy-in-acute-stroke-patients
#15
Annemarie Bluecher, Sascha Meyer Dos Santos, Nerea Ferreirós, Sandra Labocha, Isabel Maria Rodrigues Meyer Dos Santos, Bettina Picard-Willems, Sebastian Harder, Oliver C Singer
Reliable detection of anticoagulation status in patients treated with non-vitamin K antagonist oral anticoagulants (NOACs) is challenging but of importance especially in the emergency setting. This study evaluated the potential of a whole-blood clotting time assay based on Surface Acoustic Waves (SAW-CT) in stroke-patients. The SAW-technology was used for quick and homogenous recalcification of whole blood inducing a surface-activated clotting reaction quantified and visualised by real-time fluorescence microscopy with automatic imaging processing...
January 26, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28118677/predicting-malignancy-in-adrenal-incidentaloma-and-evaluation-of-a-novel-risk-stratification-algorithm
#16
Elizabeth Foo, Robin Turner, Kuan-Chi Wang, Adam Aniss, Anthony J Gill, Stanley Sidhu, Roderick Clifton-Bligh, Mark Sywak
BACKGROUND: Incidentally discovered adrenal lesions known as adrenal incidentalomas (AI) are being encountered with increasing frequency due to the widespread use of abdominal computed tomography (CT). The aim of this study was to identify the clinical predictors of malignancy in AI and to evaluate the accuracy of a recently proposed risk stratification algorithm. METHODS: A retrospective analysis of 96 patients presenting with AI between 2004 and 2014 was undertaken; 66 patients underwent adrenalectomy, and 30 were managed non-operatively...
January 24, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28114217/three-dimensional-reconstruction-of-the-craniofacial-skeleton-with-gradient-echo-magnetic-resonance-imaging-black-bone-what-is-currently-possible
#17
Karen A Eley, Stephen R Watt-Smith, Stephen J Golding
Three-dimensional (3D) reconstructed computed tomography (CT) imaging has become an integral component of craniomaxillofacial patient care. However, with increasing concern regarding the use of ionizing radiation, particularly in children with benign conditions who require repeated examinations, dose reduction and nonionizing alternatives are actively being sought. The "Black Bone" magnetic resonance imaging (MRI) technique provides uniform contrast of the soft tissues to enhance the definition of cortical bone...
January 20, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28105470/bladder-cancer-segmentation-in-ct-for-treatment-response-assessment-application-of-deep-learning-convolution-neural-network-a-pilot-study
#18
COMMENT
Kenny H Cha, Lubomir M Hadjiiski, Ravi K Samala, Heang-Ping Chan, Richard H Cohan, Elaine M Caoili, Chintana Paramagul, Ajjai Alva, Alon Z Weizer
Assessing the response of bladder cancer to neoadjuvant chemotherapy is crucial for reducing morbidity and increasing quality of life of patients. Changes in tumor volume during treatment is generally used to predict treatment outcome. We are developing a method for bladder cancer segmentation in CT using a pilot data set of 62 cases. 65 000 regions of interests were extracted from pre-treatment CT images to train a deep-learning convolution neural network (DL-CNN) for tumor boundary detection using leave-one-case-out cross-validation...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28101760/a-cad-of-fully-automated-colonic-polyp-detection-for-contrasted-and-non-contrasted-ct-scans
#19
Gökalp Tulum, Bülent Bolat, Onur Osman
PURPOSE: Computer-aided detection (CAD) systems are developed to help radiologists detect colonic polyps over CT scans. It is possible to reduce the detection time and increase the detection accuracy rates by using CAD systems. In this paper, we aimed to develop a fully integrated CAD system for automated detection of polyps that yields a high polyp detection rate with a reasonable number of false positives. METHODS: The proposed CAD system is a multistage implementation whose main components are: automatic colon segmentation, candidate detection, feature extraction and classification...
January 18, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28094413/electrical-impedance-tomography-for-lung-ventilation-monitoring-of-the-dog
#20
Simon Gloning, Korbinian Pieper, Martin Zoellner, Andrea Meyer-Lindenberg
BACKGROUND: Electrical impedance tomography (EIT) is a radiation free technique which takes advantage of the different electrical conductivities of different tissues. Its main field of application is lung ventilation monitoring. The aim of this prospective study was to evaluate the feasibility of collecting EIT information on a sample of dogs with different thoracic shapes under clinical conditions by connecting an electrode belt without fur clipping. MATERIAL AND METHODS: Fifteen pulmonary healthy dogs were anaesthetized, positioned in sternal recumbency and ventilated in a pressure-controlled mode at three different positive end-expiratory pressure levels (PEEP) of 0, 5 and 10 cmH2O for five breaths each, with a peak inspiratory pressure of 15 cmH2O...
February 9, 2017: Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere
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