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computed tomography perfusion

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https://www.readbyqxmd.com/read/28922191/acr-spr-str-practice-parameter-for-the-performance-of-cardiac-positron-emission-tomography-computed-tomography-pet-ct-imaging
#1
Rathan M Subramaniam, Warren R Janowitz, Geoffrey B Johnson, Martin A Lodge, Marguerite T Parisi, Mark R Ferguson, Jeffrey C Hellinger, Gregory W Gladish, Narainder K Gupta
This clinical practice parameter has been developed collaboratively by the American College of Radiology (ACR), the Society for Pediatric Radiology (SPR), and the Society of Thoracic Radiology (STR). This document is intended to act as a guide for physicians performing and interpreting positron emission tomography-computed tomography (PET/CT) of cardiac diseases in adults and children. The primary value of cardiac PET/CT imaging include evaluation of perfusion, function, viability, inflammation, anatomy, and risk stratification for cardiac-related events such as myocardial infarction and death...
September 15, 2017: Clinical Nuclear Medicine
https://www.readbyqxmd.com/read/28918837/diagnostic-value-of-noninvasive-computed-tomography-perfusion-imaging-and-coronary-computed-tomography-angiography-for-assessing-hemodynamically-significant-native-coronary-artery-lesions
#2
REVIEW
Pooja Sethi, Hemang B Panchal, Sreenivas P Veeranki, Zia Ur Rahman, Hadii Mamudu, Timir K Paul
BACKGROUND: The objective of this study is to determine the diagnostic performance of computed tomography perfusion (CTP) with and without computed tomography angiography (CTA) in assessment of hemodynamically significant coronary artery lesions in comparison to invasive fractional flow reserve (FFR). MATERIALS AND METHODS: PubMed and Cochrane Center Register of Controlled Trials from January 2010 searched through December 2014. Nine original studies were selected evaluating the diagnostic performance of CTP with and without CTA to invasive coronary angiography in evaluation of hemodynamic significance of coronary lesions (n = 951)...
September 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28918335/modern-diagnosis-of-chronic-thromboembolic-pulmonary-hypertension
#3
Aileen Kharat, Anne-Lise Hachulla, Stéphane Noble, Frédéric Lador
Chronic thromboembolic pulmonary hypertension (CTEPH) should be suspected in patients presenting persistent dyspnea three months after a pulmonary embolism or in patients presenting with acute pulmonary embolism and suggestive images on the CT-scan. For these patients, a specific diagnostic work-up should be performed. First step consists of the ventilation/perfusion (V/Q) scan which is a good screening test due to its high sensitivity and high negative predictive value. Pulmonary angiography remains the gold standard approach for the confirmation of the diagnosis and pre-surgical evaluation of CTEPH...
September 9, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28917674/prognostic-value-of-risk-factors-calcium%C3%A2-score-coronary-cta-myocardial%C3%A2-perfusion-imaging-and-invasive%C3%A2-coronary-angiography-in-kidney%C3%A2-transplantation-candidates
#4
Simon Winther, My Svensson, Hanne Skou Jørgensen, Laust Dupont Rasmussen, Niels Ramsing Holm, Lars Christian Gormsen, Kirsten Bouchelouche, Hans Erik Bøtker, Per Ivarsen, Morten Bøttcher
OBJECTIVES: This study sought to perform a prospective head-to-head comparison of the predictive value of clinical risk factors and a variety of cardiac imaging modalities including coronary artery calcium score (CACS), coronary computed tomography angiography (CTA), single-photon emission computed tomography (SPECT), and invasive coronary angiography (ICA) on major adverse cardiac events (MACE) and all-cause mortality in kidney transplantation candidates. BACKGROUND: Current guidelines recommend screening for coronary artery disease in kidney transplantation candidates...
September 9, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28917289/imaging-of-convective-drug-delivery-in-the-nervous-system
#5
REVIEW
Russell R Lonser
Convection-enhanced delivery permits the direct homogeneous delivery of small- and large-molecular-weight putative therapeutics to the nervous system in a manner that bypasses the blood-nervous system barrier. The development of co-infused surrogate imaging tracers (for computed tomography and MRI) allows for the real-time, noninvasive monitoring of infusate distribution during convective delivery. Real-time image monitoring of convective distribution of therapeutic agents insures that targeted structures/nervous system regions are adequately perfused, enhances safety, informs efficacy (or lack thereof) of putative agents, and provides critical information regarding the properties of convection-enhanced delivery in normal and various pathologic tissue states...
October 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28905995/leptomeningeal-collateral-status-predicts-outcome-after-middle-cerebral-artery-occlusion
#6
C F Madelung, C Ovesen, C Trampedach, A Christensen, I Havsteen, C K Hansen, H Christensen
OBJECTIVES: Perfusion through leptomeningeal collateral vessels is a likely pivotal factor in the outcome of stroke patients. We aimed to investigate the effect of collateral status on outcome in a cohort of unselected, consecutive stroke patients with middle cerebral artery occlusion undergoing reperfusion therapy. MATERIALS AND METHODS: This retrospectively planned analysis was passed on prospectively collected data from 187 consecutive patients with middle cerebral artery occlusion admitted within 4...
September 14, 2017: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/28902766/future-cardiac-events-in-patients-with-ischemic-ecg-changes-during-adenosine-infusion-as-a-myocardial-stress-agent-and-normal-cardiac-scan
#7
Hamid Amer, Khalid Niaz, Jun Hatazawa, Ahmed Gasmelseed, Hussain Al Samiri, Maram Al Othman, Mai Al Hammad
BACKGROUND: We sought to determine the prognostic importance of adenosine-induced ischemic ECG changes in patients with normal single-photon emission computed tomography myocardial perfusion images (MPI). PATIENTS AND METHODS: We carried out a retrospective analysis of 765 patients undergoing adenosine MPI between January 2013 and January 2015. Patients with baseline ECG abnormalities and/or abnormal scan were excluded. RESULTS: Overall, 67 (8...
September 11, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28901610/low-dose-dynamic-myocardial-perfusion-ct-imaging-using-a-motion-adaptive-sparsity-prior
#8
Zhaoying Bian, Dong Zeng, Zhang Zhang, Changfei Gong, Xiumei Tian, Gang Yan, Jing Huang, Hong Guo, Bo Chen, Jing Zhang, Qianjin Feng, Wufan Chen, Jianhua Ma
PURPOSE: Dynamic myocardial perfusion computed tomography (DM-PCT) imaging offers benefits over quantitative assessment of myocardial blood flow (MBF) for diagnosis and risk stratification of coronary artery disease. However, one major drawback of DM-PCT imaging is that a high radiation level is imparted by repeated scanning. To address this issue, in this work, we developed a statistical iterative reconstruction algorithm based on the penalized weighted least-squares (PWLS) scheme by incorporating a motion adaptive sparsity prior (MASP) model to achieve high-quality DM-PCT imaging with low tube current dynamic data acquisition...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28900054/whole-brain-volume-perfusion-computed-tomography-acquisition-techniques-and-radiation-dose
#9
Jie Zhang, Edward J Escott
No abstract text is available yet for this article.
July 2017: Radiologic Technology
https://www.readbyqxmd.com/read/28899442/applications-of-256-slice-spiral-computed-tomography-perfusion-scanning-in-limb-salvage-after-high-voltage-electrical-injury
#10
Pengcheng Ma, Yong Sun, Xintang Zhang, Hui Liu, Canli Liu, Jing Zhao
OBJECTIVE: This study aimed to investigate the applications of intelligent 256-slice computed tomography (iCT) perfusion imaging in high-voltage electrical injuries (HVEIs). METHODS: 256-slice iCT was used to perform perfusion scanning for 48 patients with HVEI to detect the perfusion parameters. RESULTS: The blood flow (BF) and peak enhancement intensity (PEI) values of the plane lower than the amputation level of the diseased side (ALD) were smaller than those of the corresponding healthy side (P<0...
September 13, 2017: Disaster Medicine and Public Health Preparedness
https://www.readbyqxmd.com/read/28880164/low-dose-dynamic-cerebral-perfusion-computed-tomography-reconstruction-via-kronecker-basis-representation-tensor-sparsity-regularization
#11
Jianhua Ma, Qi Xie, Wenfei Cao, Jiahui Lin, Hao Zhang, Shanli Zhang, Jing Huang, Zhaoying Bian, Deyu Meng, Zongben Xu, Zhengrong Liang, Wufan Chen, Dong Zeng
Dynamic cerebral perfusion computed tomography (DCPCT) has the ability to evaluate the hemodynamic information throughout the brain. However, due to multiple threedimensional image volume acquisitions protocol, DCPCT scanning imposes high radiation dose on the patients with growing concerns. To address this issue, in this study, based on the robust principal component analysis (RPCA, or equivalently the low-rank and sparsity decomposition) model and the DCPCT imaging procedure, we propose a new DCPCT image reconstruction algorithm to improve low-dose DCPCT and perfusion maps quality via using a powerful measure, called Kroneckerbasis- representation (KBR) tensor sparsity regularization, for measuring low-rankness extent of a tensor...
September 4, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28879528/effects-of-chronic-kidney-disease-on-myocardial-washout-rate-of-thallium-201-in-patients-with-normal-myocardial-perfusion-on-single-photon-emission-computed-tomography
#12
Satoshi Kurisu, Yoji Sumimoto, Hiroki Ikenaga, Ken Ishibashi, Yukihiro Fukuda, Yasuki Kihara
BACKGROUND: Myocardial perfusion single photon emission computed tomography (SPECT) is often performed even in patients with chronic kidney disease (CKD). We assessed the effects of CKD on myocardial washout rate (WR) of thallium (Tl)-201 in patients with normal myocardial perfusion on SPECT. METHODS: Two hundred and fifty-six patients with normal myocardial perfusion were enrolled in this study. CKD was defined as estimated glomerular filtration rate (eGFR) <60 ml/min/1...
September 6, 2017: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/28877656/longitudinal-evaluation-of-myocardial-fatty-acid-and-glucose-metabolism-in-fasted-and-nonfasted-spontaneously-hypertensive-rats-using-micropet-ct
#13
Jennifer S Huber, Andrew M Hernandez, Mustafa Janabi, James P O'Neil, Kathleen M Brennan, Stephanie T Murphy, Youngho Seo, Grant T Gullberg
Using longitudinal micro positron emission tomography (microPET)/computed tomography (CT) studies, we quantified changes in myocardial metabolism and perfusion in spontaneously hypertensive rats (SHRs), a model of left ventricular hypertrophy (LVH). Fatty acid and glucose metabolism were quantified in the hearts of SHRs and Wistar-Kyoto (WKY) normotensive rats using long-chain fatty acid analog (18)F-fluoro-6-thia heptadecanoic acid ((18)F-FTHA) and glucose analog (18)F-fluorodeoxyglucose ((18)F-FDG) under normal or fasting conditions...
January 2017: Molecular Imaging
https://www.readbyqxmd.com/read/28877099/risk-of-pulmonary-embolism-in-patients-with-isolated-great-saphenous-vein-thrombus
#14
Akshya Gupta, Vijay Pandya, Timothy Baran, Vikram S Dogra
Risks associated with isolated great saphenous vein (GSV) thrombosis remain controversial. The purpose of this study is to identify the risk of pulmonary embolism (PE) in patients with isolated GSV thrombosis, particularly those with thrombus within 3 cm of the sapheno-femoral junction. A retrospective chart review of color flow Doppler lower extremity venous ultrasound examinations from an academic hospital from 2011 to 2016 was conducted. Seventy-eight patients were identified as having acute thrombus in their GSV and were then further stratified based on the presence or absence of concomitant deep venous thrombosis (DVT)...
September 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28871423/an-application-study-of-low-dose-computed-tomography-perfusion-imaging-for-evaluation-of-the-efficacy-of-neoadjuvant-chemotherapy-for-advanced-gastric-adenocarcinoma
#15
Zongqiong Sun, Xiaofang Cheng, Yuxi Ge, Lin Shao, Yinghua Xuan, Gen Yan
BACKGROUND: This study used low-dose computed tomography (CT) perfusion imaging technology to evaluate the efficacy of neoadjuvant chemotherapy in patients with advanced gastric adenocarcinoma and to determine whether any of the perfusion parameters could predict tumor response to chemotherapy. METHODS: Forty patients with gastric adenocarcinoma (T3-4NxM0) received three cycles of neoadjuvant chemotherapy and low-dose spiral CT perfusion imaging prior to and after the first and third series of chemotherapy...
September 4, 2017: Gastric Cancer
https://www.readbyqxmd.com/read/28870377/cardiac-imaging-in-the-diagnosis-of-coronary-artery-disease
#16
Ashvarya Mangla, Estefania Oliveros, Kim Allan Williams, Dinesh K Kalra
Coronary artery disease (CAD) continues to be a leading cause of morbidity and mortality worldwide. Although invasive coronary angiography has previously been the gold standard in establishing the diagnosis of CAD, there is a growing shift to more appropriately use the cardiac catheterization laboratory to perform interventional procedures once a diagnosis of CAD has been established by noninvasive imaging modalities rather than using it primarily as a diagnostic facility to confirm or refute CAD. With ongoing technological advancements, noninvasive imaging plays a pre-eminent role in not only diagnosing CAD but also informing the choice of appropriate therapies, establishing prognosis, all while containing costs and providing value-based care...
October 2017: Current Problems in Cardiology
https://www.readbyqxmd.com/read/28869670/pulmonary-embolism-in-pregnant-patients-assessing-organ-dose-to-pregnant-phantom-and-its-fetus-during-lung-imaging
#17
Laleh Rafat Motavalli, Elie Hoseinian Azghadi, Hashem Miri Hakimabad, Parisa Akhlaghi
PURPOSE: To provide updated radiation dose from diagnostic exams performed for pregnant patients suspected of pulmonary embolism (PE) using the recently developed BREP phantoms of pregnant woman and the fetus. Also to challenge the validity of current recommendations suggest that ventilation/perfusion (V/Q) single photon emission computed tomography (SPECT) vs. computed tomography pulmonary angiography (CTPA) should be considered for diagnosis of PE in radiosensitive groups such as pregnant women...
September 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28868318/complete-shrinkage-of-the-obliterated-false-lumen-after-open-and-endovascular-chronic-aortic-dissection-stanford-type-a-repair
#18
George Samanidis, Meletios Kanakis, Constantinos Ieromonachos, George Stavridis
A 48-year-old man was admitted to our hospital with chronic aortic dissection Stanford Type A. His diagnosis was confirmed by chest multi-detector computed tomography (CT). The patient underwent combined (i.e., hybrid) open and endovascular repair (frozen elephant trunk) in a one-stage operation with moderate hypothermic circulatory arrest and antegrade cerebral perfusion. His postoperative course was uneventful, and he was discharged home on postoperative day 9. At 2-year follow-up, chest CT angiography revealed complete shrinkage of the obliterated false lumen in the distal aortic arch and descending thoracic aorta...
April 2017: Aorta (Stamford, Conn.)
https://www.readbyqxmd.com/read/28866488/radiation-dose-reduction-in-ct-myocardial-perfusion-imaging-using-smart-recon
#19
Yinsheng Li, Michael A Speidel, Christopher J Francois, Guang-Hong Chen
In this work, a newly developed statistical model based image reconstruction (referred to as Simultaneous Multiple Artifacts Reduction in Tomographic RECONstruction (SMARTRECON) [1]) is applied to low dose computer tomography (CT) myocardial perfusion imaging (CT-MPI). This method uses the nuclear norm of the spatial-temporal image matrix of the CTMPI images as a regularizer, rather than a conventional spatial regularizer that incorporates image smoothness, edge preservation, or spatial sparsity into the reconstruction...
August 30, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28865679/quantification-of-myocardial-perfusion-reserve-using-dynamic-spect-images-of-patients-with-chronic-kidney-disease
#20
Noriko Tsuda, Shinya Shiraishi, Fumi Sakamoto, Hideaki Yuki, Koji Ogasawara, Morikatsu Yoshida, Seiji Tomiguchi, Kenichi Tsujita, Yasuyuki Yamashita
BACKGROUND: Chronic kidney disease (CKD) is an independent risk factor for cardiovascular disorders. The aim of this study was to examine whether the quantitatively measured myocardial blood flow (MBF) or myocardial perfusion reserve (MPR), calculated by dynamic single photon emission computed tomography (SPECT) analysis using a cardiac cadmium zinc telluride (CZT) gamma camera, was related to renal dysfunction in patients with normal myocardial perfusion imaging (MPI) findings. METHODS: The study population consisted of 46 patients with CKD and 46 individuals without CKD (controls)...
August 30, 2017: Journal of Cardiology
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