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Thorax contrast CT

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https://www.readbyqxmd.com/read/28937491/improved-calcium-scoring-at-dual-energy-computed-tomography-angiography-using-a-high-z-contrast-element-and-novel-material-separation-technique
#1
Jack W Lambert, Yuxin Sun, Karen G Ordovas, Robert G Gould, Sizhe Wang, Benjamin M Yeh
OBJECTIVES: The aim of this study was to compare the accuracy of existing dual-energy computed tomography (CT) angiography coronary artery calcium scoring methods to those obtained using an experimental tungsten-based contrast material and a recently described contrast material extraction process (CMEP). METHODS: Phantom coronary arteries of varied diameters, with different densities and arcs of simulated calcified plaque, were sequentially filled with water, iodine, and tungsten contrast materials and scanned within a thorax phantom at rapid-kVp-switching dual-energy CT...
September 20, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28929810/dynamic-contrast-enhanced-perfusion-area-detector-ct-preliminary-comparison-of-diagnostic-performance-for-n-stage-assessment-with-fdg-pet-ct-in-non-small-cell-lung-cancer
#2
COMPARATIVE STUDY
Yoshiharu Ohno, Yasuko Fujisawa, Naoki Sugihara, Yuji Kishida, Shinichiro Seki, Hisanobu Koyama, Takeshi Yoshikawa
OBJECTIVE: The objective of our study was to directly compare the capability of dynamic first-pass contrast-enhanced (CE) perfusion area-detector CT (ADCT) and FDG PET/CT for differentiation of metastatic from nonmetastatic lymph nodes and assessment of N stage in patients with non-small cell lung carcinoma (NSCLC). SUBJECTS AND METHODS: Seventy-seven consecutive patients, 45 men (mean age ± SD, 70.4 ± 5.9 years) and 32 women (71.2 ± 7.7 years), underwent dynamic first-pass CE-perfusion ADCT at two or three different positions for covering the entire thorax, FDG PET/CT, surgical treatment, and pathologic examination...
November 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28901616/regularization-of-nonlinear-decomposition-of-spectral-x-ray-projection-images
#3
Nicolas Ducros, Juan Felipe Perez-Juste Abascal, Bruno Sixou, Simon Rit, Françoise Peyrin
PURPOSE: Exploiting the x-ray measurements obtained in different energy bins, spectral computed tomography (CT) has the ability to recover the 3-D description of a patient in a material basis. This may be achieved solving two subproblems, namely the material decomposition and the tomographic reconstruction problems. In this work, we address the material decomposition of spectral x-ray projection images, which is a nonlinear ill-posed problem. METHODS: Our main contribution is to introduce a material-dependent spatial regularization in the projection domain...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28777164/mr-imaging-of-mediastinal-masses
#4
REVIEW
Brett W Carter, Sonia L Betancourt, Marcelo F Benveniste
The mediastinum contains vital vascular and nonvascular structures and organs, and a wide variety of abnormalities may arise from this region of the thorax. Although mediastinal masses may be initially detected on chest radiography, cross-sectional imaging plays an important role in the identification and evaluation of mediastinal lesions, enabling the formulation of focused differential diagnoses and ultimately guiding management. Computed tomography (CT) is considered the imaging modality of choice for evaluating most mediastinal masses; however, the role of magnetic resonance (MR) imaging continues to expand, as it is superior to CT in differentiating between cystic and solid masses, identifying cystic and solid components within complex lesions, and distinguishing thymic hyperplasia and normal thymus from thymic epithelial neoplasms and other neoplasms...
August 2017: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/28687285/a-jafroc-study-of-nodule-detection-performance-in-ct-images-of-a-thorax-acquired-during-pet-ct
#5
J D Thompson, A Wareing, K R Szczepura, S Vinjamuri, P Hogg
PURPOSE: Two types of CT images (modalities) are acquired in PET/CT: for attenuation correction (AC) and diagnosis. The purpose of the study was to compare nodule detection and localization performance between these two modalities. METHODS: CT images, using both modalities, of an anthropomorphic chest phantom containing zero or more simulated spherical nodules of 5, 8, 10 and 12 mm diameters and contrasts -800, -630 and 100 HU were acquired. An observer performance study using nine observers interpreting 45 normal (zero nodules) images and 47 abnormal images (1-3 nodules; average 1...
August 2017: Radiography
https://www.readbyqxmd.com/read/28668419/dose-reduction-techniques-in-coronary-calcium-scoring-the-effect-of-iterative-reconstruction-combined-with-low-tube-voltage-on-calcium-scores-in-a-thoracic-phantom
#6
Marleen Vonder, Gert Jan Pelgrim, Mathias Meyer, Thomas Henzler, Matthijs Oudkerk, Rozemarijn Vliegenthart
OBJECTIVES: To define a dose-reduced coronary calcium CT protocol that provides similar calcium score values as a conventional 120kVp protocol. METHODS: A thorax phantom containing 100 calcifications was scanned with the reference protocol (120kVp, 90 ref mAs, FBP) and 30 dose-reduced protocols (70-110kVp, 90 ref mAs, FBP and iterative reconstruction (IR) levels 1-5) with 3rd generation dual-source CT. For protocols that yielded similar detectability and calcium scores as the reference protocol, additional scans were acquired at reduced ref mAs...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28658505/fast-kvp-switching-dual-energy-contrast-enhanced-thorax-and-cardiac-ct-a-phantom-study-on-the-accuracy-of-iodine-concentration-and-effective-atomic-number-measurement
#7
Antonios E Papadakis, John Damilakis
PURPOSE: To assess the effect of vessel diameter and exposure parameters on the estimation accuracy of concentration and effective atomic number (Zeff ) of iodine (I) in contrast-enhanced thorax and cardiac dual-energy CT using a modern fast kVp-switching CT scanner. METHODS: A standard semi-anthropomorphic cardiac CT phantom devised to simulate the human chest at three different body habitus i.e., medium-sized, large-sized, and obese, was scanned using a fast kVp-switching Revolution-GSI GE CT scanner...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28611938/anatomic-study-of-the-vascular-perfusion-of-the-sternum-and-its-clinical-relevance-in-deep-sternal-wound-infection
#8
Nick Spindler, Florian Kaatz, Christine Feja, Christian Etz, Friedrich-Wilhelm Mohr, Ingo Bechmann, Christoph Josten, Stefan Langer, Sabine Loeffler
Introduction: Deep sternal wound infections (DSWI) are a rare but devastating complication after median sternotomy. Minor perfusion in bone and soft tissue, especially after recruiting the internal mammary artery for bypass supports the development of wound infection and nonunion of the sternal bone. The aim of the study was the macroscopic and radiological presentation of the vascular system supplying the sternum, in particular the compensating blood supply routes in the event that the internal mammary artery is no longer available after use as a bypass vessel...
2017: GMS Interdisciplinary Plastic and Reconstructive Surgery DGPW
https://www.readbyqxmd.com/read/28583644/improved-detection-of-melanoma-metastases-by-iodine-maps-from-dual-energy-ct
#9
Monika Uhrig, David Simons, David Bonekamp, Heinz-Peter Schlemmer
OBJECTIVE: Metastatic disease in melanoma has an unpredictable nature with deposits in rare locations such as musculature. Dual energy CT (DECT) provides high contrast-visualization of enhancement by using spectral properties of iodine. Purpose of this study was to evaluate whether iodine maps from DECT improve lesion detection in staging examinations of melanoma patients. METHODS: This retrospective study was approved by IRB and written informed consent was obtained from all patients...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28522155/fibroelastic-pseudotumor-elastofibroma-dorsi-detected-by-18-f-fdg-pet-ct-scan-and-by-postherapy-radioiodine-spect-ct
#10
M Oporto, F Cepa, N Orta, S Rubí, H Navalón, C Peña
Radioiodine uptake in the thyroid tissue, metastasis of differentiated thyroid cancer (DTC), and in other tissues, depends on the expression of sodium-iodide symporter (NIS). Vascular permeability, effusions, inflammation, and other mechanisms may also play a role in the accumulation of radioactive iodine. A 63-year-old woman underwent radioiodine therapy, as well as a post-therapy whole-body scan, as she was suspected of having lung metastasis from thyroid carcinoma. The scan not only showed uptake at the lung metastasis but also a faint diffuse bilateral uptake in the posterior thorax...
May 16, 2017: Revista Española de Medicina Nuclear e Imagen Molecular
https://www.readbyqxmd.com/read/28432407/the-arterial-supply-of-the-nipple-areola-complex-nac-and-its-relations-an-analysis-of-angiographic-ct-imaging-for-breast-pedicle-design
#11
Aaron D Stirling, Conor P Murray, Mark A Lee
PURPOSE: To investigate the blood supply to the nipple areola complex (NAC) on thoracic CT angiograms (CTA) to improve breast pedicle design in reduction mammoplasty. METHODS: In a single centre, CT scans of the thorax were retrospectively reviewed for suitability by a cardiothoracic radiologist. Suitable scans had one or both breasts visible in extended fields, with contrast enhancement of breast vasculature in a female patient. The arterial sources, intercostal space perforated, glandular/subcutaneous course, vessel entry point, and the presence of periareolar anastomoses were recorded for the NAC of each breast...
April 21, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28397429/detection-of-the-adamkiewicz-artery-in-computed-tomography-of-the-thorax-and-abdomen
#12
Maciej Guziński, Maciej Bryl, Katarzyna Ziemińska, Kamila Wolny, Marek Sąsiadek, Jerzy S Garcarek
BACKGROUND: The great anterior radiculomedullary artery, also known as the artery of Adamkiewicz (AKA), is a small-caliber vessel which arises from the intercostal or lumbar arteries branching out from the aorta. OBJECTIVES: The aim of this study was to evaluate detection of the AKA, as well as its level and side of origin, with multi-slice contrast enhanced computed tomography (MSCT) of the abdomen and thorax performed during everyday clinical practice, and to compare the results with the literature...
January 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28367612/management-of-wilms-tumor-icmr-consensus-document
#13
REVIEW
Maya Prasad, Tushar Vora, Sandeep Agarwala, Siddharth Laskar, Brijesh Arora, Deepak Bansal, Gauri Kapoor, Girish Chinnaswamy, Venkatraman Radhakrishnan, Tanvir Kaur, G K Rath, Sameer Bakhshi
Wilms tumor (WT) is the most common renal tumor of childhood. Although multidisciplinary care including surgery, chemotherapy and radiotherapy have greatly improved the survival rates in WT, there is a scope for further improvement in India and other resource-poor settings. In resource-limited settings, the majority of patients present with large tumors, which may either be unresectable or risky to resect; making preoperative chemotherapy followed by delayed surgery the preferred approach. Histology and staging are used for risk stratification...
June 2017: Indian Journal of Pediatrics
https://www.readbyqxmd.com/read/28297322/evaluation-of-the-tool-reg-refine-for-user-guided-deformable-image-registration
#14
Perry B Johnson, Kyle R Padgett, Kuan L Chen, Nesrin Dogan
"Reg Refine" is a tool available in the MIM Maestro v6.4.5 platform (www.mimsoftware.com) that allows the user to actively participate in the deformable image registration process. The purpose of this work was to evaluate the efficacy of this tool and investigate strategies for how to apply it effectively. This was done by performing DIR on two publicly available ground-truth models, the Pixel-based Breathing Thorax Model (POPI) for lung, and the Deformable Image Registration Evaluation Project (DIREP) for head and neck...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28296304/low-dose-2-5-mv-cone-beam-computed-tomography-with-thick-csi-flat-panel-imager
#15
Grace Tang, Christopher Moussot, Daniel Morf, Edward Seppi, Howard Amols
Most of the treatment units, both new and old models, are equipped with a megavoltage portal imager but its use for volumetric imaging is limited. This is mainly due to the poor image quality produced by the high-energy treatment beam (>6 MV). A linac at our center is equipped with a prototype 2.5 MV imaging beam. This study evaluates the feasibility of low-dose megavoltage cone-beam imaging with the 2.5 MV beam and a thick cesium iodide detector, which is a high-efficiency imager. Basic imaging properties such as spatial resolution and modulation transfer function were assessed for the 2...
July 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28240950/computed-tomographic-assessment-of-sternal-lymph-node-dimensions-and-attenuation-in-healthy-dogs
#16
Milan Milovancev, Sarah Nemanic, Gerd Bobe
OBJECTIVE To assess dimensions and attenuation of sternal lymph nodes (SLNs) observed by means of CT in healthy dogs. ANIMALS 12 healthy adult research dogs. PROCEDURES Precontrast and postcontrast enhanced CT of the thorax was performed on each dog. Objective and subjective contrast-enhanced CT measurements were obtained. RESULTS By use of CT, 2 SLNs were identified in 10 of the 12 dogs and 1 SLN was identified in 2. Median SLN length, height, and width were 8.5 mm (range, 4 to 22 mm), 6.0 mm (range, 3 to 10 mm), and 5...
March 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28121374/lobe-based-image-reconstruction-in-electrical-impedance-tomography
#17
Benjamin Schullcke, Bo Gong, Sabine Krueger-Ziolek, Merryn Tawhai, Andy Adler, Ullrich Mueller-Lisse, Knut Moeller
PURPOSE: Electrical Impedance Tomography (EIT) is an imaging modality used to generate two-dimensional cross-sectional images representing impedance change in the thorax. The impedance of lung tissue changes with change in air content of the lungs; hence, EIT can be used to examine regional lung ventilation in patients with abnormal lungs. In lung EIT, electrodes are attached around the circumference of the thorax to inject small alternating currents and measure resulting voltages. In contrast to X-ray computed tomography (CT), EIT images do not depict a thorax slice of well defined thickness, but instead visualize a lens-shaped region around the electrode plane, which results from diffuse current propagation in the thorax...
February 2017: Medical Physics
https://www.readbyqxmd.com/read/28048240/su-f-j-117-impact-of-motion-artifacts-on-image-quality-and-accuracy-of-tumor-motion-reconstruction-in-4d-ct-on-rails-and-mv-cbct-scans-a-phantom-study
#18
T Lin, C Ma
PURPOSE: To compare and quantify respiratory motion artifacts in images from free breathing 4D-CT-on-Rails(CTOR) and those from MV-Cone-beam-CT(MVCB) and facilitate respiratory motion guided radiation therapy. METHODS: 4D-CTOR: Siemens Somatom CT-on-Rails system with Anzai belt loaded with pressure sensor load cells. 4D scans were performed in helical mode, pitch 0.1, gantry rotation time 0.5s, 1.5mm slice thickness, 120kVp, 400 mAs. Normal and fast breathing (>12rpm) scanning protocols were investigated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047456/mo-de-207a-06-ecg-gated-ct-reconstruction-for-a-c-arm-inverse-geometry-x-ray-system
#19
J M Slagowski, Dap Dunkerley
PURPOSE: To obtain ECG-gated CT images from truncated projection data acquired with a C-arm based inverse geometry fluoroscopy system, for the purpose of cardiac chamber mapping in interventional procedures. METHODS: Scanning-beam digital x-ray (SBDX) is an inverse geometry fluoroscopy system with a scanned multisource x-ray tube and a photon-counting detector mounted to a C-arm. In the proposed method, SBDX short-scan rotational acquisition is performed followed by inverse geometry CT (IGCT) reconstruction and segmentation of contrast-enhanced objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28027768/the-evolution-of-radiation-dose-over-time-measurement-of-a-patient-cohort-undergoing-whole-body-examinations-on-three-computer-tomography-generations
#20
Roy P Marcus, Elise Koerner, Roland C Aydin, Dominik Zinsser, Tobias Finke, Christian J Cyron, Fabian Bamberg, Konstantin Nikolaou, Mike Notohamiprodjo
OBJECTIVES: To evaluate and compare the radiation dose and image quality of whole-body-CT (WBCT) performed on the 3rd-generation dual-source-CT (DSCT) with 2nd-generation DSCT and 64-slices-Single-Source-CT (SSCT) in a large patient cohort. MATERIAL AND METHODS: Using a monitoring and tracking software 1451, 747 and 1861 patients scanned with a one-spiral-thorax-abdomen-pelvis-CT-examination on a 3rd-, 2nd-generation DSCT and SSCT, respectively, were extracted from the PACS server...
January 2017: European Journal of Radiology
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