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computed tomography perfusion

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https://www.readbyqxmd.com/read/28718888/assessing-lung-function-using-contrast-enhanced-dual-energy-computed-tomography-for-potential-applications-in-radiation-therapy
#1
Andréanne Lapointe, Houda Bahig, Danis Blais, Hugo Bouchard, Édith Filion, Jean-François Carrier, Stéphane Bedwani
PURPOSE: There is an increasing interest in the evaluation of lung function from physiological images in radiation therapy treatment planning to reduce the extent of post-radiation toxicities. The purpose of this work is to retrieve reliable functional information from contrast-enhanced dualenergy computed tomography (DECT) for new applications in radiation therapy. The functional information obtained by DECT is also compared with other methods using single energy CT (SECT) and single-photon emission computed tomography (SPECT) with CT...
July 18, 2017: Medical Physics
https://www.readbyqxmd.com/read/28717801/mimicking-arterial-thrombosis-in-a-3d-printed-microfluidic-in-vitro-vascular-model-based-on-computed-tomography-angiography-data
#2
Pedro F Costa, Hugo J Albers, John E A Linssen, Heleen H T Middelkamp, Linda van der Hout, Robert Passier, Albert van den Berg, Jos Malda, Andries D van der Meer
Arterial thrombosis is the main instigating factor of heart attacks and strokes, which result in over 14 million deaths worldwide every year. The mechanism of thrombosis involves factors from the blood and the vessel wall, and it also relies strongly on 3D vessel geometry and local blood flow patterns. Microfluidic chip-based vascular models allow controlled in vitro studies of the interaction between vessel wall and blood in thrombosis, but until now, they could not fully recapitulate the 3D geometry and blood flow patterns of real-life healthy or diseased arteries...
July 18, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28717538/assessment-of-prostate-cancer-with-integrated-ct-perfusion-using-a-sector-wise-approach
#3
Matteo Ferrari, Martin Huellner, Chantal Pauli, Burkhardt Seifert, Hansjörg Danuser, Patrick Veit-Haibach, Agostino Mattei
OBJECTIVE: The role of computed tomography perfusion (CTP) in characterizing primary prostate cancer (PCa) is not definitely known. The aim of the present study was to investigate the relationship between CTP parameters and histopathological features of PCa tissue, using a sector-wise approach. MATERIAL AND METHODS: Fifty-one patients with biopsy-proven PCa underwent prospectively a CTP scan prior to radical prostatectomy. Blood flow (BF), mean blood volume (BV) and mean transit time (MTT) were calculated, with the prostate being divided into eight sectors...
June 2017: Turkish Journal of Urology
https://www.readbyqxmd.com/read/28716981/prediction-of-clinical-outcome-after-acute-ischemic-stroke-the-value-of-repeated-noncontrast-computed-tomography-computed-tomographic-angiography-and-computed-tomographic-perfusion
#4
Jan W Dankbaar, Alexander D Horsch, Andor F van den Hoven, L Jaap Kappelle, Irene C van der Schaaf, Tom van Seeters, Birgitta K Velthuis
BACKGROUND AND PURPOSE: Early prediction of outcome in acute ischemic stroke is important for clinical management. This study aimed to compare the relationship between early follow-up multimodality computed tomographic (CT) imaging and clinical outcome at 90 days in a large multicenter stroke study. METHODS: From the DUST study (Dutch Acute Stroke Study), patients were selected with (1) anterior circulation occlusion on CT angiography (CTA) and ischemic deficit on CT perfusion (CTP) on admission, and (2) day 3 follow-up noncontrast CT, CTP, and CTA...
July 17, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28715708/the-evaluation-of-brain-perfusion-spect-using-an-easy-z-score-imaging-system-in-the-mild-cognitive-impairment-subjects-with-brain-amyloid-%C3%AE-deposition
#5
Makoto Takemaru, Noriyuki Kimura, Yoshitake Abe, Megumi Goto, Etsuro Matsubara
OBJECTIVE: The analysis of (99)mTc-ECD single-photon emission computed tomography (SPECT) images using the easy Z-score imaging system (eZIS) program is useful for the diagnosis of early AD in daily medical practice. However, it remains unclear whether eZIS analysis can identify the amnestic mild cognitive impairment (MCI) subjects with brain amyloid-β deposition. The aim of this study was to evaluate the usefulness of an eZIS analysis for predicting amnestic MCI subjects with brain amyloid β deposition...
July 5, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28711443/regional-distribution-of-pulmonary-blood-volume-with-dual-energy-computed-tomography-results-in-42-subjects
#6
Paul Felloni, Alain Duhamel, Jean-Baptiste Faivre, Jessica Giordano, Suonita Khung, Valérie Deken, Jacques Remy, Martine Remy-Jardin
RATIONALE AND OBJECTIVES: The noninvasive approach of lung perfusion generated from dual-energy computed tomography acquisitions has entered clinical practice. The purpose of this study was to analyze the regional distribution of iodine within distal portions of the pulmonary arterial bed on dual-source, dual-energy computed tomography examinations in a cohort of subjects without cardiopulmonary pathologies. MATERIALS AND METHODS: The study population included 42 patients without cardiorespiratory disease, enabling quantitative and qualitative analysis of pulmonary blood volume after administration of a 40% contrast agent...
July 12, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28707262/exercise-n-13-cardiac-positron-emission-tomography-myocardial-perfusion-imaging-detecting-ischemia-in-an-adult-patient-with-anomalous-aortic-origin-of-the-left-main-coronary-artery-from-the-right-coronary-sinus
#7
Matthew R Summers, Hani Najm, James L Gentry Iii, Wael A Jaber
Anomalous aortic origin of a coronary artery is a rare congenital condition that has variable presentations from atypical chest pain to syncope and cardiac arrest. Commonly used myocardial perfusion imaging techniques, stress agents, and perfusion agents may have limited ability to detect inducible ischemia in this rare patient group. We herein describe a unique case of anomalous left main coronary artery from a common right coronary sinus ostium with a subpulmonic and intramyocardial course. This patient had multiple atypical chest pain presentations and multiple-negative pharmacologic single-photon emission-computed tomography stress tests performed...
July 13, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28705930/influence-of-attenuation-correction-by-brain-perfusion-spect-ct-simulated-abnormal-bone-structure-comparison-between-chang-and-ct-methods
#8
Takayuki Shibutani, Masahisa Onoguchi, Nanako Miyamoto, Yasushi Yamamoto, Seigo Kinuya
Introduction: Brain perfusion single photon emission computed tomography (SPECT) has physical phenomena such as attenuation, scatter, and degradation of resolution that impair accuracy on data acquisition. Chang and computed tomography (CT) methods have spread application for attenuation correction (AC) and indicate the utility of AC using a brain phantom without a bone or with a normal bone structure. However, non-uniform AC of an abnormal bone structure such as postoperative bone defect following burr-hole surgery has not yet evaluated...
July 13, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28704454/indocyanine-green-kinetics-with-near-infrared-spectroscopy-predicts-cerebral-hyperperfusion-syndrome-after-carotid-artery-stenting
#9
Ichiro Nakagawa, Hun Soo Park, Shohei Yokoyama, Shuichi Yamada, Yasushi Motoyama, Young Su Park, Takeshi Wada, Kimihiko Kichikawa, Hiroyuki Nakase
BACKGROUND: Cerebral hyperperfusion syndrome (HPS) is a potentially life-threatening complication following carotid artery stenting (CAS) and carotid endoarterectomy (CEA). Early prediction and treatment of patients at risk for HPS are required in patients undergoing CAS because HPS occurs significantly earlier after CAS than CEA. Near-infrared spectroscopy (NIRS) is often used for monitoring, and indocyanine green (ICG) kinetics by NIRS (ICG-NIRS) can detect reductions in cerebral perfusion in patients with acute stroke...
2017: PloS One
https://www.readbyqxmd.com/read/28704292/improvement-of-higher-brain-dysfunction-after-brain-injury-by-repetitive-transcranial-magnetic-stimulation-and-intensive-rehabilitation-therapy-case-report
#10
Takatoshi Hara, Masahiro Abo, Nobuyuki Sasaki, Naoki Yamada, Masachika Niimi, Mari Kenmoku, Kastuya Kawakami, Reiko Saito
Repetitive transcranial magnetic stimulation (rTMS) and intensive cognitive rehabilitation (CR) were administered to two patients with cognitive dysfunction following brain injury. The first case was a 67-year-old man who presented with memory dysfunction, attention dysfunction, and decreased insight following diffuse axonal injury. High-frequency rTMS (10 Hz, 2400 pulses/day) targeting the anterior cingulate using a navigation system and CR were administered for 12 days at 1 year from the onset of injury...
July 12, 2017: Neuroreport
https://www.readbyqxmd.com/read/28700488/correlation-of-iodine-uptake-and-perfusion-parameters-between-dual-energy-ct-imaging-and-first-pass-dual-input-perfusion-ct-in-lung-cancer
#11
Xiaoliang Chen, Yanyan Xu, Jianghui Duan, Chuandong Li, Hongliang Sun, Wu Wang
To investigate the potential relationship between perfusion parameters from first-pass dual-input perfusion computed tomography (DI-PCT) and iodine uptake levels estimated from dual-energy CT (DE-CT).The pre-experimental part of this study included a dynamic DE-CT protocol in 15 patients to evaluate peak arterial enhancement of lung cancer based on time-attenuation curves, and the scan time of DE-CT was determined. In the prospective part of the study, 28 lung cancer patients underwent whole-volume perfusion CT and single-source DE-CT using 320-row CT...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28700136/an-automated-framework-to-quantify-areas-of-regional-ischemia-in-retinal-vascular-diseases-with-oct-angiography
#12
Neha Anegondi, Lavanya Chidambara, Devanshi Bhanushali, Santosh G K Gadde, Naresh Kumar Yadav, Abhijit Sinha Roy
In this observational and cross-sectional study, capillary non perfusion (CNP) and vascular changes in branch retinal vein occlusion (BRVO, sample size (n) = 26) and choroidal neovascularization (CNV, n = 29) were evaluated. Subjects underwent imaging using Optical coherence tomography angiography (Angiovue™ OCTA , RTVue XR, Optovue Inc., Fremont, CA). Local fractal analysis was applied to the OCTA images of superficial, deep and choriocapillaries layer. CNP area (BRVO eyes) and vascular parameters were computed using local fractal based method...
July 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28699019/the-diagnostic-performance-of-spect-mpi-to-predict-functional-significant-coronary-artery-disease-by-fractional-flow-reserve-derived-from-ccta-ffrct-sub-analysis-from-accuracy-and-vct001-studies
#13
Rine Nakanishi, Kazuhiro Osawa, Indre Ceponiene, Glenn Huth, Jason Cole, Michael Kim, Negin Nezarat, Sina Rahmani, Dong Li, Souma Gupta, Campbell Rogers, Christopher Dailing, Matthew J Budoff
Although single photon emission computed tomography-myocardial perfusion image (SPECT-MPI) and fractional flow reserve (FFR) derived from coronary computed tomographic angiography (CCTA) (FFRCT) have permitted functional assessment of coronary artery disease (CAD), the concordance between these modalities has not been well described. The aim of this study is to compare SPECT-MPI and anatomical stenosis by CCTA and invasive coronary angiography to FFRCT for assessing functional significance of CAD. We identified 62 patients with suspected CAD who underwent ≥64 slice coronary CTA and SPECT-MPI within 3 months...
July 11, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28697838/-hypertension-and-intermittent-convulsions-for-one-month-in-a-school-age-child
#14
Mao-Qiang Tian, Shu-Yi Liu, Juan Li, Xiao-Mei Shu
Childhood polyarteritis nodosa (PAN) is a rare systemic vasculitis and the delayed diagnosis and treatment will cause high incidence of sequelae and high mortality. This article reports a girl with childhood PAN due to posterior reversible encephalopathy syndrome (PRES). The girl aged ten years was admitted to the hospital due to hypertension and convulsions for one month. She had complaints of headache, vomiting, and blurred vision before convulsions. At six months before admission, a mass was observed in the neck...
July 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28692493/the-application-of-technetium-99m-red-blood-cell-scintigraphy-in-the-diagnosis-of-orbital-cavernous-hemangioma
#15
Hua Dong, Zuncheng Zhang, Yongtao Guo, Hong Zhang, Wengui Xu
OBJECTIVE: The purpose of this study was to evaluate the clinical value of technetium-99m-red blood cell (Tc-RBC) scintigraphy in the diagnosis of orbital cavernous hemangioma (OCH). PATIENTS AND METHODS: Forty-one patients with pathologically confirmed orbital mass, of which 10 were OCH, underwent Tc-RBC scintigraphy in this study. The scanning procedure included an initial perfusion phase, followed by an early and a delayed blood pool phase. All patients underwent ultrasonography and computed tomography (CT), and 15 patients also underwent MRI...
July 7, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28692492/criteria-for-the-addition-of-prone-imaging-to-myocardial-perfusion-single-photon-emission-computed-tomography-for-inferior-wall
#16
Koji Nakaya, Masahisa Onoguchi, Yoshihiro Nishimura, Keisuke Kiso, Hideki Otsuka, Yoshifumi Nouno, Takayuki Shibutani, Eisuke Yasuda
OBJECTIVE: Myocardial perfusion single-photon emission computed tomography (SPECT) is occasionally suspected to generate images that represent either ischemia or infarction for the inferior wall [right coronary artery (RCA) disease] or attenuation artifacts because of the diaphragm. We often encounter this. The application of prone imaging is advantageous in the differentiation of RCA disease because of attenuation artifacts. If decreased accumulation of radioisotopes is observed at the site with either RCA disease or attenuation artifacts, then a criterion that enables the addition of prone imaging should be implemented...
July 7, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28689345/extensive-brain-infarction-involving-deep-structures-during-an-acetazolamide-challenged-single-photon-emission-computed-tomography-scan-in-a-patient-with-moyamoya-disease
#17
Sangjoon Chong, June Dong Park, Jong Hee Chae, Jung-Eun Cheon, Seung-Ki Kim, Ji Hoon Phi, Ji Yeoun Lee, Jin Chul Paeng, Kyu-Chang Wang
BACKGROUND: Acetazolamide-challenged brain single-photon emission computed tomography (SPECT) is used for the evaluation of cerebral perfusion in cerebrovascular diseases including moyamoya disease (MMD). Not a few patients experience adverse side effects during the acetazolamide-challenged brain SPECT, but most of the symptoms are mild and transient. To our knowledge, this is the first case report of severe brain infarction leading to death during the examination of an acetazolamide-challenged brain SPECT in a patient with MMD...
July 8, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28687640/early-imaging-prediction-of-malignant-cerebellar-edema-development-in-acute-ischemic-stroke
#18
Matthias P Fabritius, Kolja M Thierfelder, Felix G Meinel, Ahmed E Othman, Franziska Dorn, Bastian O Sabel, Pierre Scheffler, Birgit Ertl-Wagner, Wieland H Sommer, Wolfgang G Kunz
BACKGROUND AND PURPOSE: Malignant cerebellar edema (MCE) is a life-threatening complication of acute ischemic stroke that requires timely diagnosis and management. Aim of this study was to identify imaging predictors in initial multiparametric computed tomography (CT), including whole-brain CT perfusion (WB-CTP). METHODS: We consecutively selected all subjects with cerebellar ischemic WB-CTP deficits and follow-up-confirmed cerebellar infarction from an initial cohort of 2635 patients who had undergone multiparametric CT because of suspected stroke...
July 7, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28687538/temporal-trends-of-single-photon-emission-computed-tomography-myocardial-perfusion-imaging-in-patients-with-coronary-artery-disease-a-22-year-experience-from-a-tertiary-academic-medical-center
#19
Hayan Jouni, J Wells Askew, Daniel J Crusan, Todd D Miller, Raymond J Gibbons
BACKGROUND: There has been a gradual decline in the prevalence of abnormal stress single-photon emission computed tomography (SPECT) myocardial perfusion imaging studies among patients without history of coronary artery disease (CAD). The trends of SPECT studies among patients with known CAD have not been evaluated previously. METHODS AND RESULTS: We assessed the Mayo Clinic nuclear cardiology database for all stress SPECT tests performed between January 1991 and December 2012 in patients with history of CAD defined as having previous myocardial infarction, percutaneous coronary intervention, and coronary artery bypass grafting...
July 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28686698/flow-velocity-driven-differentiation-of-human-mesenchymal-stromal-cells-in-silk-fibroin-scaffolds-a-combined-experimental-and-computational-approach
#20
Jolanda Rita Vetsch, Duncan Colin Betts, Ralph Müller, Sandra Hofmann
Mechanical loading plays a major role in bone remodeling and fracture healing. Mimicking the concept of mechanical loading of bone has been widely studied in bone tissue engineering by perfusion cultures. Nevertheless, there is still debate regarding the in-vitro mechanical stimulation regime. This study aims at investigating the effect of two different flow rates (vlow = 0.001m/s and vhigh = 0.061m/s) on the growth of mineralized tissue produced by human mesenchymal stromal cells cultured on 3-D silk fibroin scaffolds...
2017: PloS One
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