keyword
MENU ▼
Read by QxMD icon Read
search

Tomography perfusion

keyword
https://www.readbyqxmd.com/read/27901210/effects-of-alveolar-bone-displacement-with-segmental-osteotomy-micro-ct-and-histomorphometric-analysis-in-rats
#1
Taegun Kim, Won Lee, Sang-Ho Baek, Sungwoon Pyo, Yoon-Ah Kook, Mohamed Bayome, Insoo Kim
The purpose of this study was to evaluate the effects of segmental osteotomy on the blood vessels and osteoclasts in rats using micro-computed tomography (micro-CT) and histomorphometric analysis. After segmental osteotomy was performed around the maxillary first molars of 36 male Sprague-Dawley rats (n = 72), the samples were divided into a control group (no displacement), 0.5 D group (0.5 mm buccal displacement) and 1.0 D group (1.0 mm buccal displacement) (n = 24/group). At 1, 2, 4 and 8 weeks after surgery, changes in the blood vessel volume were investigated using micro-CT with perfusion of radiopaque silicone rubber...
November 28, 2016: Brazilian Oral Research
https://www.readbyqxmd.com/read/27900758/99mtc-hmpao-perfusion-spect-ct-in-the-diagnosis-of-brain-death
#2
Thorsten Derlin, Desiree Weiberg
This report describes a case of brain death (BD) evaluated by 99mTc-hexamethylpropylene amine oxime (HMPAO) single photon emission tomography/computed tomography (SPECT/CT). A 16-year-old boy with a history of rapid unexpected brain herniation due to pilocytic astrocytoma underwent 99mTc-HMPAO SPECT/CT for evaluation of brain death in the context of organ donation. Flow images demonstrated lack of blood flow to the brain, and delayed images showed absence of demonstrable radionuclide activity within the brain...
2016: Nuclear Medicine Review. Central & Eastern Europe
https://www.readbyqxmd.com/read/27898505/clinical-role-of-post-angioplasty-hyperemic-microvascular-resistances-in-chronic-ischemic-left-ventricular-dysfunction
#3
Riccardo Gorla, Edoardo Verna, Simone Scotti, Sergio Ghiringhelli, Laura Zoli, Stefano Provasoli, Silvana Garancini, Roberto De Ponti, Jorge A Salerno-Uriarte
AIMS: To investigate the impact of hyperemic microvascular resistances (HMRs) on myocardial perfusion and contractility after percutaneous coronary intervention (PCI) in chronic ischemic left ventricular dysfunction (CILVD). METHODS: The current retrospective study included 48 patients with CILVD of the left anterior descending territory undergoing HMRs assessment before and after PCI with a dual-sensor intracoronary pressure-flow wire. The severity of resting myocardial underperfusion and contractile dysfunction of the left anterior descending territory was scored as summed rest score (SRS-T) by single photon emission tomography, wall motion score index (WMSI-T) and left ventricular ejection fraction (LVEF) by transthoracic echocardiography before PCI and after 3 months...
November 24, 2016: Journal of Cardiovascular Medicine
https://www.readbyqxmd.com/read/27896227/stress-first-single-photon-emission-computed-myocardial-perfusion-imaging
#4
C I Aquino, M Scarano, F Squame, G Casaburi, S L Nori, L Pace
BACKGROUND: Myocardial perfusion imaging (MPI) with single photon emission tomography (SPET) is widely used in coronary artery disease evaluation. Recently major dosimetric concerns have arisen. The aim of this study was to evaluate if a pre-test scoring system could predict the results of stress SPET MPI, thus avoiding two radionuclide injections. METHODS: All consecutive patients (n=309) undergoing SPET MPI during the first 6 months of 2014 constituted the study group...
November 2016: Translational Medicine @ UniSa
https://www.readbyqxmd.com/read/27895453/a-case-of-a-living-related-kidney-transplantation-after-ex-vivo-repair-of-the-donor-renal-artery-aneurysm
#5
P Christopoulos, A Faryal, M Dosani, D Rix, D Talbot
BACKGROUND: Kidney transplantation is the definite surgical treatment for end-stage renal disease. Shortage of organs and the increasing number of patients with end-stage renal disease has led to an expansion of the selection criteria promoting the use of organs from marginal donors. Use of kidneys with renal artery aneurysm (RAA) is one such example. Description of the case: We report a case of living-related kidney transplantation from a 46-year-old female donor with unilateral RAA to her 68-year-old father...
January 2016: Hippokratia
https://www.readbyqxmd.com/read/27893680/the-value-of-ezis-analysis-of-tc-99m-ecd-spect-on-identifying-cerebellar-hypoperfusion-in-a-patient-with-superficial-siderosis-a-case-report
#6
Cheng-Yu Wei, Tai-Yi Chen, Ian Shih, Pai-Yi Chiu, Guang-Uei Hung, Hiroshi Matsuda
INTRODUCTION: Brain perfusion single photon computed tomography (SPECT) is a functional imaging modality and has been widely utilized in evaluation of various kinds of neurological disorders. Easy z-score imaging system (eZIS) is a computer-assisted statistical analysis, based on the comparison with age-classified ethyl cysteinate dimer (ECD) normal database, which provides objectively interpretation of Tc-99m ECD brain perfusion SPECT.Here we presented a 64-year-old male with dizziness, spin sensation, nausea, and vomiting in the emergency room, and brain computed tomography scan showed only small hypodensity lesion in cerebellum...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27891826/ct-brain-perfusion-a-static-phantom-study-of-contrast-to-noise-ratio-and-radiation-dose
#7
Stewart M Midgley, Damien L Stella, Bruce Cv Campbell, Francesca Langenberg, Paul F Einsiedel
INTRODUCTION: Computed tomography perfusion (CTP) is increasingly employed in the diagnosis and management of ischaemic stroke but radiation dose can be significant and optimising contrast-to-noise ratio (CNR) is challenging. This study aimed to quantify and optimise the balance between CNR as a surrogate for image quality and radiation dose. METHODS: A perspex head phantom with vials of dilute contrast agent was scanned using a Siemens Definition Flash 128-slice scanner...
November 27, 2016: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/27886985/efficacy-of-lens-protection-systems-dependency-on-different-cranial-ct-scans-in-the-acute-stroke-setting
#8
Nika Guberina, Michael Forsting, Adrian Ringelstein
To evaluate the dose-reduction potential with different lens protectors for patients undergoing cranial computed tomography (CT) scans. Eye lens dose was assessed in vitro (α-Al2O3:C thermoluminescence dosemeters) using an Alderson-Rando phantom(®) in cranial CT protocols at different CT scanners (SOMATOM-Definition-AS+(®)(CT1) and SOMATOM-Definition-Flash(®) (CT2)) using two different lens-protection systems (Somatex(®) (SOM) and Medical Imaging Systems(®) (MIS)). Summarised percentage of the transmitted photons: (1) CT1 (a) unenhanced CT (nCT) with gantry angulation: SOM = 103%, MIS = 111%; (2) CT2 (a) nCT without gantry angulation: SOM = 81%, MIS = 91%; (b) CT angiography (CTA) with automatic dose-modulation technique: SOM = 39%, MIS = 74%; (c) CTA without dose-modulation technique: SOM = 22%, MIS = 48%; (d) CT perfusion: SOM = 44%, MIS = 69%...
November 24, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27886421/pathophysiology-of-dyspnoea-in-acute-pulmonary-embolism-a-cross-sectional-evaluation
#9
Olivier Sanchez, Aurore Caumont-Prim, Elisabeth Riant, Laurent Plantier, Martin Dres, Bruno Louis, Marie-Anne Collignon, Benoit Diebold, Guy Meyer, Claudine Peiffer, Christophe Delclaux
BACKGROUND AND OBJECTIVE: Dyspnoea in pulmonary embolism (PE) remains poorly characterized. Little is known about how to measure intensity or about the underlying mechanisms that may be related to ventilatory abnormalities, alveolar dead space ventilation or modulating factors such as psychological modulate. We hypothesized that dyspnoea would mainly be associated with pulmonary vascular obstruction and its pathophysiological consequences, while the sensory-affective domain of dyspnoea would be influenced by other factors...
November 25, 2016: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/27881570/excess-cardiovascular-risk-in-women-relative-to-men-referred-for-coronary-angiography-is-associated-with-severely-impaired-coronary-flow-reserve-not-obstructive-disease
#10
Viviany R Taqueti, Leslee J Shaw, Nancy R Cook, Venkatesh L Murthy, Nishant R Shah, Courtney R Foster, Jon Hainer, Ron Blankstein, Sharmila Dorbala, Marcelo F Di Carli
BACKGROUND: -Cardiovascular disease (CVD) fatality rates are higher for women as compared with men, yet obstructive coronary artery disease (CAD) is less prevalent in women. Coronary flow reserve (CFR), an integrated measure of large and small vessel CAD and myocardial ischemia, identifies patients at risk for CVD death, but is not routinely measured in clinical practice. We sought to investigate the impact of sex, CFR, and angiographic CAD severity on adverse cardiovascular events. METHODS: -Consecutive patients (N=329, 43% women) referred for invasive coronary angiography after stress testing with myocardial perfusion positron emission tomography (PET) and with left ventricular ejection fraction >40% were followed (median 3...
November 14, 2016: Circulation
https://www.readbyqxmd.com/read/27880806/choroidal-round-hyporeflectivities-in-geographic-atrophy
#11
Eleonora Corbelli, Riccardo Sacconi, Luigi Antonio De Vitis, Adriano Carnevali, Alessandro Rabiolo, Lea Querques, Francesco Bandello, Giuseppe Querques
PURPOSE: In geographic atrophy (GA), choroidal vessels typically appear on structural optical coherence tomography (OCT) as hyperreflective round areas with highly reflective borders. We observed that some GA eyes show choroidal round hyporeflectivities with highly reflective borders beneath the atrophy, and futher investigated the charcteristcs by comparing structural OCT, indocyanine green angiography (ICGA) and OCT angiography (OCT-A). METHODS: Round hyporeflectivities were individuated from a pool of patients with GA secondary to non-neovascular age-related macular degeneration consecutively presenting between October 2015 and March 2016 at the Medical Retina & Imaging Unit of the University Vita-Salute San Raffaele...
2016: PloS One
https://www.readbyqxmd.com/read/27880734/the-role-of-necrosis-acute-hypoxia-and-chronic-hypoxia-in-18-f-fmiso-pet-image-contrast-a-computational-modelling-study
#12
Daniel R Warren, Mike Partridge
Positron emission tomography (PET) using (18)F-fluoromisonidazole (FMISO) is a promising technique for imaging tumour hypoxia, and a potential target for radiotherapy dose-painting. However, the relationship between FMISO uptake and oxygen partial pressure ([Formula: see text]) is yet to be quantified fully. Tissue oxygenation varies over distances much smaller than clinical PET resolution (<100 μm versus  ∼4 mm), and cyclic variations in tumour perfusion have been observed on timescales shorter than typical FMISO PET studies (∼20 min versus a few hours)...
November 23, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27879370/validation-of-mri-determination-on-pet-measurements-in-ischemic-stroke
#13
Wolf-Dieter Heiss, Olivier Zaro Weber
The concept of the ischemic penumbra was formulated based on animal experiments showing functional impairment and electrophysiological disturbances with decreasing flow to the brain below defined values (the threshold for function) and irreversible tissue damage with blood supply further decreased (the threshold for infarction). The perfusion range between these thresholds was termed "penumbra", and restitution of flow above the functional threshold was able to reverse the deficits without permanent damage...
November 22, 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27873171/prognostic-value-of-lower-limb-perfusion-single-photon-emission-computed-tomography-computed-tomography-in-patients-with-lower-limb-atherosclerotic-peripheral-artery-disease
#14
Hidenobu Hashimoto, Yoshimitsu Fukushima, Shin-Ichiro Kumita, Masaaki Miyamoto, Gen Takagi, Junichi Yamazaki, Takanori Ikeda
PURPOSE: The purpose of this study was to estimate the severity of the participants' lower limb ischemia by calculating the lower limb muscle-to-background ratio (LMBR) using lower limb perfusion single-photon emission computed tomography-computed tomography (SPECT/CT) and to evaluate the prognostic value of LMBR in peripheral artery disease (PAD) patients. MATERIALS AND METHODS: This retrospective study consists of 38 patients with PAD (70 ± 12 years) and observed over 1 year who were included in the analysis...
November 21, 2016: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/27871168/long-term-prognosis-of-end-stage-renal-disease-patients-with-normal-myocardial-perfusion-as-determined-by-single-photon-emission-computed-tomography
#15
Gun Ha Park, Jae Won Song, Chang Min Lee, Young Rim Song, Sung Gyun Kim, Hyung Jik Kim, Jwa Kyung Kim
Background/Aims: Normal myocardial perfusion is closely associated with very low rates of cardiac events and better long-term outcomes; however, little is known about its prognostic value in patients with end-stage renal disease (ESRD). Methods: A total of 286 incident patients underwent baseline cardiac evaluations using echocardiography and stress-rest single-photon emission computed tomography. Perfusion scans for 177 patients (61.9%) who had a summed stress score (SSS) < 4 were normal...
November 22, 2016: Korean Journal of Internal Medicine
https://www.readbyqxmd.com/read/27870973/transthoracic-doppler-echocardiography-compared-with-positron-emission-tomography-for-assessment-of-coronary-microvascular-dysfunction-the-ipower-study
#16
Marie Mide Michelsen, Naja Dam Mygind, Adam Pena, Rasmus Huan Olsen, Thomas Emil Christensen, Adam Ali Ghotbi, Philip Hasbak, Andreas Kjaer, Ida Gustafsson, Peter Riis Hansen, Henrik Steen Hansen, Nis Høst, Jens Kastrup, Eva Prescott
BACKGROUND: Coronary microvascular function can be assessed by transthoracic Doppler echocardiography as a coronary flow velocity reserve (TTDE CFVR) and by positron emission tomography as a myocardial blood flow reserve (PET MBFR). PET MBFR is regarded the noninvasive reference standard for measuring coronary microvascular function but has limited availability. We compared TTDE CFVR with PET MBFR in women with angina pectoris and no obstructive coronary artery disease and assessed repeatability of TTDE CFVR...
November 7, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27869849/optical-coherence-tomography-imaging-of-capillary-reperfusion-after-ischemic-stroke
#17
Jonghwan Lee, Yasemin Gursoy-Ozdemir, Buyin Fu, David A Boas, Turgay Dalkara
Although progress has been made for recanalization therapies after ischemic stroke, post-treatment imaging studies show that tissue reperfusion cannot be attained despite satisfactory recanalization in a significant percentage of patients. Hence, investigation of microcirculatory changes in both surface and deep cortical levels after ischemia reperfusion is important for understanding the post-stroke blood flow dynamics. In this study, we applied optical coherence tomography (OCT) imaging of cerebral blood flow for the quantification of the microcirculatory changes...
November 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/27867544/a-morphologic-study-of-the-airway-structure-abnormalities-in-patients-with-asthma-by-high-resolution-computed-tomography
#18
Dan Wang, Jian Luo, Wen Du, Lan-Lan Zhang, Li-Xiu He, Chun-Tao Liu
BACKGROUND: Airway structure changes, termed as airway remodeling, are common in asthma patients due to chronic inflammation, which can be assessed by high-resolution computed tomography (HRCT). Considering the controversial conclusions in the correlation of morphologic abnormalities with clinical feature and outcome, we aimed to further specify and evaluate the structural abnormalities of Chinese asthmatics by HRCT. METHODS: From August 2012 to February 2015, outpatients with asthma were recruited consecutively in the Asthma Center of West China Hospital, Sichuan University...
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27865580/the-role-of-dual-energy-computed-tomography-in-the-assessment-of-pulmonary-function
#19
REVIEW
Hye Jeon Hwang, Eric A Hoffman, Chang Hyun Lee, Jin Mo Goo, David L Levin, Hans-Ulrich Kauczor, Joon Beom Seo
The assessment of pulmonary function, including ventilation and perfusion status, is important in addition to the evaluation of structural changes of the lung parenchyma in various pulmonary diseases. The dual-energy computed tomography (DECT) technique can provide the pulmonary functional information and high resolution anatomic information simultaneously. The application of DECT for the evaluation of pulmonary function has been investigated in various pulmonary diseases, such as pulmonary embolism, asthma and chronic obstructive lung disease and so on...
November 8, 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27861231/wavelet-based-angiographic-reconstruction-of-computed-tomography-perfusion-data-diagnostic-value-in-cerebral-venous-sinus-thrombosis
#20
Wolfgang G Kunz, Felix Schuler, Wieland H Sommer, Matthias P Fabritius, Lukas Havla, Felix G Meinel, Maximilian F Reiser, Birgit Ertl-Wagner, Kolja M Thierfelder
OBJECTIVE: The aim of this study was to test the diagnostic value of wavelet-based angiographic reconstruction of CT perfusion data (waveletCTA) to detect cerebral venous sinus thrombosis (CVST) in patients who underwent whole-brain CT perfusion imaging (WB-CTP). MATERIALS AND METHODS: Datasets were retrospectively selected from an initial cohort of 2863 consecutive patients who had undergone multiparametric CT including WB-CTP. WaveletCTA was reconstructed from WB-CTP: the angiographic signal was generated by voxel-based wavelet transform of time attenuation curves (TACs) from WB-CTP raw data...
November 17, 2016: Investigative Radiology
keyword
keyword
341
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"