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computed tomography perfusion

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https://www.readbyqxmd.com/read/29163351/computed-tomography-perfusion-alberta-stroke-program-early-computed-tomography-score-is-associated-with-hemorrhagic-transformation-after-acute-cardioembolic-stroke
#1
Lan Liu, Bo Wu, Jinglong Zhao, Yanyan Cao, Nikita Dedhia, Louis R Caplan, Qiaoshu Wang
Alberta Stroke Program Early Computed Tomography (CT) score (ASPECTS) has been applied to CT perfusion (CTP) with good interrater agreement to predict early ischemic stroke, and it can be useful in decision making in acute ischemic stroke. The aim of the present study was to assess the predictive value of CTP ASPECTS of hemorrhagic transformation (HT) in acute cardioembolic stroke. This is a single-enter, retrospective study. All patients hospitalized with acute cardioembolic stroke from January 2008 to September 2013 were included...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29161440/novel-arch-fenestrated-stent-graft-for-acute-stanford-type-a-aortic-dissection-with-open-antegrade-implantation
#2
Qing Zhou, Yunxing Xue, Hailong Cao, Jun Pan, Qiang Wang, Fudong Fan, Dongjin Wang
OBJECTIVES: The best surgical strategy for acute Stanford Type A aortic dissection (aTAAD) involving the arch remains controversial. Here, we report on the satisfactory results following aTAAD repair using a novel arch fenestrated stent graft. METHODS: From December 2014 to December 2015, 42 aTAAD patients (27 male and 15 female) underwent ascending aorta replacement and fenestrated stent graft implantation. The fenestrated stent graft was implanted into the true lumen of the aortic arch and proximal descending aorta, with the fenestration opening located at the ostia of 3 head vessels in the arch...
November 17, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29160168/cerebral-blood-volume-lesion-extent-predicts-functional-outcome-in-patients-with-vertebral-and-basilar-artery-occlusion
#3
Fana Alemseged, Darshan G Shah, Andrew Bivard, Timothy J Kleinig, Nawaf Yassi, Marina Diomedi, Francesca Di Giuliano, Gagan Sharma, Roy Drew, Bernard Yan, Richard J Dowling, Steven Bush, Fabrizio Sallustio, Carlo Caltagirone, Nicola B Mercuri, Roberto Floris, Mark W Parsons, Christopher R Levi, Peter J Mitchell, Stephen M Davis, Bruce Cv Campbell
Background CT perfusion may improve diagnostic accuracy in posterior circulation stroke. The posterior circulation Acute Stroke Prognosis Early CT score (pc-ASPECTS) on Computed Tomography Angiography source images (CTA-SI) predicts functional outcome in patients with basilar artery occlusion. Aims We assessed the prognostic value of pc-ASPECTS on CT perfusion in patients with vertebral and basilar artery occlusion (VBAO) in comparison with CTA-SI. Methods Whole-brain CT perfusion from consecutive stroke patients with VBAO at four stroke centers was retrospectively analyzed...
January 1, 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/29158250/increased-liver-fatty-acid-uptake-is-partly-reversed-and-liver-fat-content-normalized-after-bariatric-surgery
#4
Heidi Immonen, Jarna C Hannukainen, Nobuyuki Kudomi, Jussi Pihlajamäki, Virva Saunavaara, Jukka Laine, Paulina Salminen, Terho Lehtimäki, Tam Pham, Patricia Iozzo, Pirjo Nuutila
OBJECTIVE: Changes in liver fatty acid metabolism are important in understanding the mechanisms of diabetes remission and metabolic changes after bariatric surgery. RESEARCH DESIGN AND METHODS: Liver fatty acid uptake (LFU), blood flow, and fat content (LFC) were measured in 25 obese subjects before bariatric surgery and 6 months after using positron emission tomography/computed tomography and MRS; 14 lean individuals served as the control subjects. RESULTS: The increased LFU in obese subjects was associated with body adiposity...
November 20, 2017: Diabetes Care
https://www.readbyqxmd.com/read/29157853/perfusion-imaging-in-acute-traumatic-brain-injury
#5
REVIEW
David B Douglas, Ruchir Chaudhari, Jason M Zhao, James Gullo, Jared Kirkland, Pamela K Douglas, Ely Wolin, James Walroth, Max Wintermark
Traumatic brain injury (TBI) is a significant problem worldwide and neuroimaging plays a critical role in diagnosis and management. Recently, perfusion neuroimaging techniques have been explored in TBI to determine and characterize potential perfusion neuroimaging biomarkers to aid in diagnosis, treatment, and prognosis. In this article, computed tomography (CT) bolus perfusion, MR imaging bolus perfusion, MR imaging arterial spin labeling perfusion, and xenon CT are reviewed with a focus on their applications in acute TBI...
February 2018: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/29157849/imaging-of-chronic-concussion
#6
REVIEW
Eliana Bonfante, Roy Riascos, Octavio Arevalo
Conventional imaging findings in patients with cerebral concussion and chronic traumatic encephalopathy are absent or subtle in the majority of cases. The most common abnormalities include cerebral volume loss, enlargement of the cavum of the septum pellucidum, cerebral microhemorrhages, and white matter signal abnormalities, all of which have poor sensitivity and specificity. Advanced imaging modalities, such as diffusion tensor imaging (DTI), blood oxygen level dependent functional MR Imaging (BOLD fMRI), MR spectroscopy, perfusion imaging, positron emission tomography (PET), single photon emission computed tomography (SPECT), and magnetoencephalography detect physiologic abnormalities in symptomatic patients and, although currently in the investigation phase, may become useful in the clinical arena...
February 2018: Neuroimaging Clinics of North America
https://www.readbyqxmd.com/read/29157444/a-tool-to-visualize-and-analyze-perfusion-data-development-and-application-of-the-r-package-ctp
#7
Seth T Lirette, Andrew D Smith, Inmaculada B Aban
BACKGROUND AND OBJECTIVE: Computed tomography perfusion (CTP) is a widely used imaging modality especially in neuroimaging. Despite this, CTP is often prohibitive due to the dearth of free/open-source software. This could have wide-ranging implications for instruction and research. We have implemented an online-available CTP tool built and run completely within the R computing environment. METHODS: Called from within R, the user can select one of four different methods to construct a cerebral blood flow (CBF) map: (1) max-slope (2) singular value decomposition (3) block circulant singular value decomposition or (4) oscillation minimization singular value decomposition...
January 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29155940/stented-balloon-fenestration-before-entry-repair-using-the-frozen-elephant-trunk-technique-for-chronic-aortic-dissection
#8
Naomichi Uchida, Yoshitaka Yamane, Tomokuni Furukawa
Endovascular fenestration on the abdominal aorta is effective for preventing visceral malperfusion in aortic dissection. We report a case of stented balloon fenestration before residual entry repair using the frozen elephant trunk technique for chronic aneurysmal dissection after ascending aortic replacement for DeBakey I aortic dissection. We recognized poor communication between the true lumen and false lumen in the abdominal aorta, and visceral perfusion depended almost entirely on the proximal large entry...
October 9, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29153359/multi-detector-ct-liver-protocol-and-recent-developments
#9
REVIEW
N Kartalis, K Brehmer, L Loizou
Multi-detector computed tomography is today the workhorse in the evaluation of the vast majority of patients with known or suspected liver disease. Reasons for that include widespread availability, robustness and repeatability of the technique, time-efficient image acquisitions of large body volumes, high temporal and spatial resolution as well as multiple post-processing capabilities. However, as the technique employs ionizing radiation and intravenous iodine-based contrast media, the associated potential risks have to be taken into account...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29152431/intensity-modulated-proton-therapy-with-advanced-planning-techniques-in-a-challenging-hepatocellular-carcinoma-patient
#10
Smith Apisarnthanarax, Jatinder Saini, Avril O'Ryan-Blair, Jackie Castro, Stephen R Bowen
The use of radiation therapy has been increasing over recent years for the treatment of hepatocellular carcinoma (HCC). Proton beam therapy (PBT) has emerged as a promising treatment option for HCC patients due to its dosimetric advantages of sparing more normal liver tissue from radiation at low to moderate doses compared to photon-based treatments while still delivering high doses of radiation to tumors. The PBT therapy may be particularly beneficial in high-risk HCC cirrhotic patients with large, bulky tumors and/or vascular invasion complicated by surrounding perfusion abnormalities...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29151545/-novel-perfusion-evaluation-method-using-phase-ratio-image-map-in-head-4d-ct
#11
Tomomi Ohmura, Yongbum Lee, Noriyuki Takahashi, Hideto Toyoshima
PURPOSE: CT perfusion (CTP) is a powerful tool for the assessment of cerebrovascular disease. However, CTP maps are significantly different depending on CTP software and algorithm, even when using identical image data. We developed a phase-ratio image map (PI map), which was a novel perfusion map, without using CTP software. The purpose of this study was to investigate the usefulness of the PI map by comparing it with a positron emission tomography (PET) image. METHODS: Twenty patients (16 men, 4 women; mean age: 61...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29150710/computed-tomography-perfusion-is-a%C3%A2-useful-adjunct-to-computed-tomography-angiography-in-the-diagnosis-of-brain-death
#12
M Sawicki, J Sołek-Pastuszka, K Chamier-Ciemińska, A Walecka, J Walecki, R Bohatyrewicz
BACKGROUND: In the diagnosis of brain death (BD), computed tomography angiography (CTA) results in some cases show intracranial filling, leading to diagnostic confusion. Because cerebral circulatory arrest commences at the capillary level, we hypothesized that computed tomography perfusion (CTP) would be a more sensitive approach than CTA; therefore, the aim of the study was to compare the sensitivities of CTP and CTA in the diagnosis of BD. MATERIAL AND METHODS: Whole brain CTP was performed in patients in the intensive care unit diagnosed with BD and CTA was derived from CTP datasets...
November 17, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29147830/asymptomatic-adult-intrapericardial-diaphragmatic-hernia-detected-on-cardiac-spect-ct
#13
Muhammad Yasir Adeel, Saad Sikanderkhel, Zartashia Shahab, Isabel Oliva, Jaime Gerber
An 83-year-old man underwent exercise stress test with single photon emission computed tomography (SPECT) myocardial perfusion imaging for new electrocardiogram (EKG) changes. The stress EKG did not show any significant changes. Myocardial perfusion imaging with SPECT demonstrated an inferior wall defect and extracardiac uptake of nuclear tracer. Simultaneous cardiac computed tomography performed for attenuation correction showed presence of intrapericardial hepatic tissue in an anterior diaphragmatic hernia...
November 16, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29147735/reduction-of-metallic-artifacts-of-the-post-treatment-intracranial-aneurysms-effects-of-single-energy-metal-artifact-reduction-algorithm
#14
Yu-Ning Pan, Ge Chen, Ai-Jing Li, Zhao-Qian Chen, Xiang Gao, Yi Huang, Bradley Mattson, Shan Li
PURPOSE: This study evaluated the quality of computed tomography (CT) and CT angiography images generated using the single-energy metal artifact reduction (SEMAR) algorithm during perfusion examination in patients who had undergone reconstruction with neurosurgical clipping or endovascular coiling for treatment of aneurysms. METHODS: A total of 55 patients with implanted intracranial clips or coils (24 men and 31 women; mean age 60.15 ± 15.86 years) underwent perfusion studies evaluated by CT and CT angiography with a 320-row CT scanner...
November 16, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29145285/degeneration-of-paramedian-nuclei-in-the-thalamus-induces-holmes-tremor-in-a-case-of-artery-of-percheron-infarction
#15
Tz-Shiang Wei, Chun-Sheng Hsu, Yu-Chun Lee, Shin-Tsu Chang
RATIONALE: Holmes' tremor is an uncommon neurologic disorder following brain insults, and its pathogenesis is undefined. The interruption of the dento-rubro-thalamic tract and secondary deterioration of the nigrostriatal pathway are both required to initiate Holmes' tremor. We used nuclear medicine imaging tools to analyze a patient with concurrent infarction in different zones of each side of the thalamus. Finding whether the paramedian nuclear groups of the thalamus were injured was a decisive element for developing Holmes' tremor...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29144161/use-of-patient-outcome-endpoints-to-identify-the-best-functional-ct-imaging-parameters-in-metastatic-renal-cell-carcinoma-patients
#16
Jill Rachel Mains, Frede Donskov, Erik Morre Petersen, Hans Henrik Torp Madsen, Jesper Thygesen, Kennet Thorup, Finn Rasmussen
OBJECTIVE: To use the patient outcome endpoints overall survival and progression-free survival to evaluate functional parameters derived from dynamic contrast-enhanced computed tomography (DCE-CT). METHODS: 69 patients with metastatic renal cell carcinoma (mRCC) had DCE-CT scans at baseline and after 5 and 10 weeks of treatment. Blood volume, blood flow and standardized perfusion values were calculated using deconvolution (BVdeconv, BFdeconv and SPVdeconv), blood flow and standardized perfusion values using maximum slope (BFmax and SPVmax), and blood volume and permeability surface area product using the Patlak model (BVpatlak and PS)...
November 16, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29142357/single-coronary-artery-demonstrating-slightly-decreased-13-nh3-stress-flows-in-its-distal-flow-territories
#17
Sabrine Q Kol, Jouke J Boer, Friso M van der Zant, Remco J J Knol
A 54-year-old male patient was referred for computed tomography angiography to rule out cardiovascular disease. The examination revealed a single coronary artery originating from the right sinus of Valsalva, extending to the normal left circumflex artery and left anterior descending artery domains. The computed tomography showed only mild coronary sclerosis. The myocardial stress flow on the subsequently performed (13)NH3 myocardial perfusion positron emission tomography demonstrated a relative stress flow reduction in the distal segments along the monocoronary...
October 2017: Indian Journal of Nuclear Medicine: IJNM: the Official Journal of the Society of Nuclear Medicine, India
https://www.readbyqxmd.com/read/29137612/comparison-of-semi-quantitative-and-quantitative-dynamic-contrast-enhanced-mri-evaluations-of-vertebral-marrow-perfusion-in-a-rat-osteoporosis-model
#18
Jingqi Zhu, Zuogang Xiong, Jiulong Zhang, Yuyou Qiu, Ting Hua, Guangyu Tang
BACKGROUND: This study aims to investigate the technical feasibility of semi-quantitative and quantitative dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in the assessment of longitudinal changes of marrow perfusion in a rat osteoporosis model, using bone mineral density (BMD) measured by micro-computed tomography (micro-CT) and histopathology as the gold standards. METHODS: Fifty rats were randomly assigned to the control group (n=25) and ovariectomy (OVX) group whose bilateral ovaries were excised (n=25)...
November 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29135347/relative-cerebral-blood-volume-is-associated-with-collateral-status-and-infarct-growth-in-stroke-patients-in-swift-prime
#19
Juan F Arenillas, Elisa Cortijo, Pablo García-Bermejo, Elad I Levy, Reza Jahan, Mayank Goyal, Jeffrey L Saver, Gregory W Albers
We aimed to evaluate how predefined candidate cerebral perfusion parameters correlate with collateral circulation status and to assess their capacity to predict infarct growth in patients with acute ischemic stroke (AIS) eligible for endovascular therapy. Patients enrolled in the SWIFT PRIME trial with baseline computed tomography perfusion (CTP) scans were included. RAPID software was used to calculate mean relative cerebral blood volume (rCBV) in hypoperfused regions, and hypoperfusion index ratio (HIR). Blind assessments of collaterals were performed using CT angiography in the whole sample and cerebral angiogram in the endovascular group...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29131773/update-on-cardiovascular-applications-of-multienergy-ct
#20
Kevin Kalisz, Sandra Halliburton, Suhny Abbara, Jonathon A Leipsic, Moritz H Albrecht, U Joseph Schoepf, Prabhakar Rajiah
Advances in scanner technology enabling shorter scan times, improvements in spatial and temporal resolution, and more dose-efficient data reconstruction coupled with rapidly growing evidence from clinical trials have established computed tomography (CT) as an important imaging modality in the evaluation of cardiovascular disorders. Multienergy (or spectral or dual-energy) CT is a relatively recent advance in which attenuation data from different energies are used to characterize materials beyond what is possible at conventional CT...
November 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
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