keyword
MENU ▼
Read by QxMD icon Read
search

Thorax contrast CT

keyword
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
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28005510/case-237-renal-cell-carcinoma-with-osseous-metaplasia
#4
Billy Ming Hei Lai, Solomon Yig Joon Ka, Wai Kuen Kan, Man Wah Lam, Tang Fei Lee, Yun Hoi Lui, Jennifer Lai San Khoo
History A 47-year-old man presented with palpitations and decreased exercise tolerance. A peripheral blood smear revealed anemia, thrombocytopenia, and blast cells, and a diagnosis of acute myeloid leukemia was made. Immunohistochemistry revealed positivity for cluster of differentiation (or CD) markers, which have been reported to be associated with an increased risk of extramedullary leukemic involvement. Thus, contrast material-enhanced computed tomography (CT) of the thorax, abdomen, and pelvis was requested to enable exclusion of any extramedullary extension of leukemia...
January 2017: Radiology
https://www.readbyqxmd.com/read/27936890/incidental-findings-in-the-skeletal-musculature-on-computed-tomography
#5
Dominik Schramm, Annkathrin Justus, Andreas Gunter Bach, Alexey Surov
OBJECTIVE: The purpose of this study was to analyze intramuscular incidental findings identified on computed tomography (CT) in a large patients cohort. METHODS: In the time period from 2010 to 2015 a total of 44 794 patients with several diagnoses were investigated by CT. Only patients, who underwent body CT including the neck, thorax, abdomen and pelvic regions after intravenous application of contrast medium were involved in the study. There were 4085 patients...
December 12, 2016: British Journal of Radiology
https://www.readbyqxmd.com/read/27880736/experimental-validation-of-a-multi-energy-x-ray-adapted-scatter-separation-method
#6
A Sossin, V Rebuffel, J Tabary, J M Létang, N Freud, L Verger
Both in radiography and computed tomography (CT), recently emerged energy-resolved x-ray photon counting detectors enable the identification and quantification of individual materials comprising the inspected object. However, the approaches used for these operations require highly accurate x-ray images. The accuracy of the images is severely compromised by the presence of scattered radiation, which leads to a loss of spatial contrast and, more importantly, a bias in radiographic material imaging and artefacts in CT...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27813098/four-cases-of-pulmonary-thromboembolism-diagnosed-by-endobronchial-ultrasound
#7
Onur Fevzi Erer, Pinar Cimen, Mehmet Unlu, Nuran Katgi
Endobronchial ultrasound (EBUS) is a technique for the detection of mediastinal abnormalities. A total of 548 EBUS procedures were performed for various indications, and in four cases (0.7%), filling defects in central pulmonary arteries were demonstrated fortuitously during the procedure. Subsequently, all patients underwent contrast-enhanced CT of the thorax to confirm the diagnosis of pulmonary thromboembolism (PTE). In three of the four cases, there was a concomitant lung cancer. PTE can be incidentally detected during EBUS; therefore, pulmonary arteries should be examined carefully during EBUS in all patients, particularly in patients with suspected or proven malignancy...
November 3, 2016: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/27749415/incidental-sclerosing-pneumocytoma-detected-on-bone-scintigraphy
#8
Alex Cheen Hoe Khoo, Fadzilah Hamzah, Choo Khoon Ong
Nonosseous uptake in Tc-hydroxymethylene bone scintigraphy should always be evaluated for any possibility of pathological changes. We share interesting images of a 60-year-old woman initially investigated for suspected osteomyelitis of the left femur but found to have an extraosseous uptake in the right hemithorax on bone scintigraphy. Plain chest radiograph followed by contrast-enhanced CT of the thorax revealed the presence of a lung mass in the right lower lobe with no lymphadenopathy. CT-guided biopsy yielded fibrocollagenous tissue, partly lined by benign pneumocytes...
January 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/27588815/motion-aware-temporal-regularization-for-improved-4d-cone-beam-computed-tomography
#9
Cyril Mory, Guillaume Janssens, Simon Rit
Four-dimensional cone-beam computed tomography (4D-CBCT) of the free-breathing thorax is a valuable tool in image-guided radiation therapy of the thorax and the upper abdomen. It allows the determination of the position of a tumor throughout the breathing cycle, while only its mean position can be extracted from three-dimensional CBCT. The classical approaches are not fully satisfactory: respiration-correlated methods allow one to accurately locate high-contrast structures in any frame, but contain strong streak artifacts unless the acquisition is significantly slowed down...
September 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27584084/thoracic-splenosis-report-of-a-case-and-review-of-the-diagnostic-workup
#10
Walter Bugiantella, Federico Crusco, Nicola Avenia, Rondelli Fabio
UNLABELLED: Splenosis is the autoimplantation of splenic tissue to ectopic sites after spleen injury. Although splenosis most commonly occurs in the abdomen, it may occur in the thorax in case of diaphragm rupture. Thoracic splenosis (TS) is often asymptomatic and is diagnosed incidentally in the course of chest examination. We describe the case of a man, with a history of thoracoabdominal trauma, undergoing routine chest radiography with the evidence of radio-opaque images close to the inferior left curvature of the cardiac shadow, which resulted to be nodules of TS at the contrast enhanced CT scan...
July 29, 2016: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/27578939/thoracic-aortic-aneurysm-a-rare-cause-of-elevated-hemidiaphragm
#11
Md Arshad Ejazi, Md Mazhar Alam, Mohammad Shameem, Rakesh Bhargava, C G Adil Wafi, Salauddin
Phrenic nerve palsy causing hemidiaphragm paralysis is a very uncommon feature of thoracic aortic aneurysm. In one case, a 30 year male complained of chronic dull aching chest pain, and hoarseness of voice; posteroanterior view chest radiograph revealed large spherical radiopacity on the left upper lung zone with smooth lobulated margin with elevated left hemidiaphragm. On Colour Doppler sonography, lesion was anechoic on gray scale sonography but on Doppler analysis revealed intense internal vascularity within it with characteristic "Ying Yang" sign...
July 2016: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/27562479/ct-imaging-before-transcatheter-aortic-valve-implantation-tavi-using-variable-helical-pitch-scanning-and-its-diagnostic-performance-for-coronary-artery-disease
#12
Shunsuke Matsumoto, Yoshitake Yamada, Masahiro Hashimoto, Teppei Okamura, Minoru Yamada, Fumiaki Yashima, Kentaro Hayashida, Keiichi Fukuda, Masahiro Jinzaki
OBJECTIVES: To evaluate the effectiveness of CT before TAVI using variable helical pitch (VHP) scanning and its diagnostic performance for coronary artery disease (CAD). METHODS: Sixty patients (84.4 ± 4.6 years) scheduled for TAVI underwent CT using VHP scanning with the contrast material (CM) volume calculated as scanning time × weight [kg] × 0.06 mL. Retrospective electrocardiography (ECG)-gated scanning was utilized to examine the thorax, and non-ECG-gated scanning of the abdomen immediately followed...
August 25, 2016: European Radiology
https://www.readbyqxmd.com/read/27504353/video-assisted-thoracoscopic-surgery-vats-for-excision-of-an-ectopic-anterior-mediastinal-intra-thymic-parathyroid-adenoma
#13
Dukhabandhu Naik, Kumaradoss Felix Jebasingh, Ramprasath, Gnanamuthu Birla Roy, Mazhuvanchary Jacob Paul
Ectopic anterior mediastinal parathyroid adenoma is a rare cause of Primary Hyperparathyroidism (PHPT). Imaging studies such as Technetium-99m ((99m)Tc) sestamibi parathyroid scan along with a Single Photon Emission Computerized Tomogram (SPECT), and contrast enhanced Computerized Tomogram (CT) of the neck and thorax can precisely localize the ectopic mediastinal parathyroid adenoma. We report a 40-year-old gentleman who presented with persistent pain in the right shoulder following trivial trauma. His biochemical investigations showed an elevated serum calcium of 11...
June 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27473367/evaluation-of-gantry-speed-on-image-quality-and-imaging-dose-for-4d-cone-beam-ct-acquisition
#14
Andrew P Santoso, Kwang H Song, Yujiao Qin, Stephen J Gardner, Chang Liu, Indrin J Chetty, Benjamin Movsas, Munther Ajlouni, Ning Wen
BACKGROUND: This study investigates the effect of gantry speed on 4DCBCT image quality and dose for the Varian On-Board Imager®. METHODS: A thoracic 4DCBCT protocol was designed using a 125 kVp spectrum. Image quality parameters were evaluated for 4DCBCT acquisition using Catphan® phantom with real-time position management™ system for gantry speeds varying between 1.0 to 6.0°/s. Superior-inferior motion of the phantom was executed using a sinusoidal waveform with five second period...
July 29, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27455493/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 (> 6MV). 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 2.5MV 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 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27386365/successful-closure-of-spontaneous-esophageal-rupture-boerhaave-s-syndrome-by-endoscopic-ligation-with-snare-loops
#16
Jun Kuwabara, Yuji Watanabe, You Kojima, Naoyuki Higaki, Yoshiou Ikeda, Kouichi Sato, Motohira Yoshida, Yuji Yamamoto, Satoshi Kikuchi
INTRODUCTION: Spontaneous esophageal rupture is a rare condition with a high mortality rate, and it is generally treated by surgery. In the present report, successful non-surgical closure of spontaneous esophageal rupture by endoscopic ligation with snare loops in a patient with pyopneumothorax and septicemia is presented. CASE DESCRIPTION: The case of an 80-year-old man patient with spontaneous esophageal rupture who was cured by endoscopic ligation with snare loops is reported...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27384058/ct-scan-does-not-differentiate-patients-with-hepatopulmonary-syndrome-from-other-patients-with-liver-disease
#17
Yingming Amy Chen, Vikramaditya Prabhudesai, Helene Castel, Samir Gupta
BACKGROUND: Hepatopulmonary syndrome (HPS) is defined by liver dysfunction, intrapulmonary vascular dilatations, and impaired oxygenation. The gold standard for detection of intrapulmonary vascular dilatations in HPS is contrast echocardiography. However, two small studies have suggested that patients with HPS have larger segmental pulmonary arterial diameters than both normal subjects and normoxemic subjects with cirrhosis, when measured by CT. We sought to compare CT imaging-based pulmonary vasodilatation in patients with HPS, patients with liver dysfunction without HPS, and matching controls on CT imaging...
2016: PloS One
https://www.readbyqxmd.com/read/27249312/a-novel-scatter-separation-method-for-multi-energy-x-ray-imaging
#18
A Sossin, V Rebuffel, J Tabary, J M Létang, N Freud, L Verger
X-ray imaging coupled with recently emerged energy-resolved photon counting detectors provides the ability to differentiate material components and to estimate their respective thicknesses. However, such techniques require highly accurate images. The presence of scattered radiation leads to a loss of spatial contrast and, more importantly, a bias in radiographic material imaging and artefacts in computed tomography (CT). The aim of the present study was to introduce and evaluate a partial attenuation spectral scatter separation approach (PASSSA) adapted for multi-energy imaging...
June 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27198924/a-motion-algorithm-to-extract-physical-and-motion-parameters-of-mobile-targets-from-cone-beam-computed-tomographic-images
#19
Nesreen Alsbou, Salahuddin Ahmad, Imad Ali
PURPOSE: A motion algorithm has been developed to extract length, CT number level and motion amplitude of a mobile target from cone-beam CT (CBCT) images. MATERIALS AND METHODS: The algorithm uses three measurable parameters: Apparent length and blurred CT number distribution of a mobile target obtained from CBCT images to determine length, CT-number value of the stationary target, and motion amplitude. The predictions of this algorithm are tested with mobile targets having different well-known sizes that are made from tissue-equivalent gel which is inserted into a thorax phantom...
May 17, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27192499/image-quality-in-oncologic-chest-computerized-tomography-with-iterative-reconstruction-a-phantom-study
#20
Kristin Jensen, Trond Mogens Aaløkken, Anders Tingberg, Erik Fosse, Anne Catrine T Martinsen
OBJECTIVE: The purpose of this study was to validate iterative reconstruction technique in oncologic chest computed tomography (CT). METHODS: An anthropomorphic thorax phantom with 4 simulated tumors was scanned on a 64-slice CT scanner with 2 different iterative reconstruction techniques: one model based (MBIR) and one hybrid (ASiR). Dose levels of 14.9, 11.1, 6.7, and 0.6 mGy were used, and all images were reconstructed with filtered back projection (FBP) and both iterative reconstruction algorithms...
May 2016: Journal of Computer Assisted Tomography
keyword
keyword
63837
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"