scholarly journals Diagnostic accuracy of flat-panel computed tomography in assessing cerebral perfusion in comparison with perfusion computed tomography and perfusion magnetic resonance: a systematic review

2019 ◽  
Vol 61 (12) ◽  
pp. 1457-1468 ◽  
Author(s):  
Ernst L. Stille ◽  
Ilaria Viozzi ◽  
Mark ter Laan ◽  
Frederick J.A. Meijer ◽  
Jurgen J. Futterer ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Systematic Review ◽  
Magnetic Resonance ◽  
Diagnostic Accuracy ◽  
Cerebrovascular Disease ◽  
Blood Volume ◽  
Perfusion Imaging ◽  
Cerebral Perfusion ◽  
Flat Panel ◽  
Perfusion Computed Tomography

Abstract Purpose Flat-panel computed tomography (FP-CT) is increasingly available in angiographic rooms and hybrid OR’s. Considering its easy access, cerebral imaging using FP-CT is an appealing modality for intra-procedural applications. The purpose of this systematic review is to assess the diagnostic accuracy of FP-CT compared with perfusion computed tomography (CTP) and perfusion magnetic resonance (MRP) in cerebral perfusion imaging. Methods We performed a systematic literature search in the Cochrane Library, MEDLINE, Embase, and Web of Science up to June 2019 for studies directly comparing FP-CT with either CTP or MRP in vivo. Methodological quality was assessed using the QUADAS-2 tool. Data on diagnostic accuracy was extracted and pooled if possible. Results We found 11 studies comparing FP-CT with CTP and 5 studies comparing FP-CT with MRP. Most articles were pilot or feasibility studies, focusing on scanning and contrast protocols. All patients studied showed signs of cerebrovascular disease. Half of the studies were animal trials. Quality assessment showed unclear to high risks of bias and low concerns regarding applicability. Five studies reported on diagnostic accuracy; FP-CT shows good sensitivity (range 0.84–1.00) and moderate specificity (range 0.63–0.88) in detecting cerebral blood volume (CBV) lesions. Conclusions Even though FP-CT provides similar CBV values and reconstructed blood volume maps as CTP in cerebrovascular disease, additional studies are required in order to reliably compare its diagnostic accuracy with cerebral perfusion imaging.

scholarly journals Systematic Review of Perfusion Imaging With Computed Tomography and Magnetic Resonance in Acute Ischemic Stroke: Heterogeneity of Acquisition and Postprocessing Parameters

Stroke ◽  
2012 ◽  
Vol 43 (2) ◽  
pp. 563-566 ◽  
Author(s):  
Krishna A. Dani ◽  
Ralph G.R. Thomas ◽  
Francesca M. Chappell ◽  
Kirsten Shuler ◽  
Keith W. Muir ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Systematic Review ◽  
Ischemic Stroke ◽  
Magnetic Resonance ◽  
Acute Ischemic Stroke ◽  
Perfusion Imaging

scholarly journals Is ultrasound perfusion imaging capable of detecting mismatch? A proof-of-concept study in acute stroke patients

2016 ◽  
Vol 37 (4) ◽  
pp. 1517-1526 ◽  
Author(s):  
Raluca Reitmeir ◽  
Jens Eyding ◽  
Markus F Oertel ◽  
Roland Wiest ◽  
Jan Gralla ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Magnetic Resonance ◽  
Perfusion Imaging ◽  
Contrast Enhanced Ultrasound ◽  
Proof Of Concept ◽  
Perfusion Computed Tomography ◽  
Magnetic Resonance Perfusion ◽  
Time To Peak ◽  
Contrast Enhanced ◽  
Chi Squared

In this study, we compared contrast-enhanced ultrasound perfusion imaging with magnetic resonance perfusion-weighted imaging or perfusion computed tomography for detecting normo-, hypo-, and nonperfused brain areas in acute middle cerebral artery stroke. We performed high mechanical index contrast-enhanced ultrasound perfusion imaging in 30 patients. Time-to-peak intensity of 10 ischemic regions of interests was compared to four standardized nonischemic regions of interests of the same patient. A time-to-peak >3 s (ultrasound perfusion imaging) or >4 s (perfusion computed tomography and magnetic resonance perfusion) defined hypoperfusion. In 16 patients, 98 of 160 ultrasound perfusion imaging regions of interests of the ischemic hemisphere were classified as normal, and 52 as hypoperfused or nonperfused. Ten regions of interests were excluded due to artifacts. There was a significant correlation of the ultrasound perfusion imaging and magnetic resonance perfusion or perfusion computed tomography (Pearson's chi-squared test 79.119, p < 0.001) (OR 0.1065, 95% CI 0.06–0.18). No perfusion in ultrasound perfusion imaging (18 regions of interests) correlated highly with diffusion restriction on magnetic resonance imaging (Pearson’s chi-squared test 42.307, p < 0.001). Analysis of receiver operating characteristics proved a high sensitivity of ultrasound perfusion imaging in the diagnosis of hypoperfused area under the curve, (AUC = 0.917; p < 0.001) and nonperfused (AUC = 0.830; p < 0.001) tissue in comparison with perfusion computed tomography and magnetic resonance perfusion. We present a proof of concept in determining normo-, hypo-, and nonperfused tissue in acute stroke by advanced contrast-enhanced ultrasound perfusion imaging.

scholarly journals Cerebral perfusion imaging in vasospasm

2006 ◽  
Vol 21 (3) ◽  
pp. 1-9 ◽  
Author(s):  
Shivanand P. Lad ◽  
Raphael Guzman ◽  
Michael E. Kelly ◽  
Gordon Li ◽  
Michael Lim ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Perfusion Imaging ◽  
Cerebral Perfusion ◽  
Single Photon ◽  
Early Recognition ◽  
Imaging Techniques ◽  
Photon Emission ◽  
Emission Computed Tomography ◽  
Common Cause ◽  
Perfusion Computed Tomography

✓Vasospasm following cerebral aneurysm rupture is one of the most devastating sequelae and the most common cause of delayed ischemic neurological deficit (DIND). Because vasospasm also is the most common cause of morbidity and mortality in patients who survive the initial bleeding episode, it is imperative not only to diagnose the condition but also to predict which patients are likely to become symptomatic. The exact pathophysiology of vasospasm is complex and incompletely elucidated. Early recognition of vasospasm is essential because the timely use of several therapeutic interventions can counteract this disease and prevent the occurrence of DIND. However, the prompt implementation of these therapies depends on the ability to predict impending vasospasm or to diagnose it at its early stages. A number of techniques have been developed during the past several decades to evaluate cerebral perfusion, including positron emission tomography, xenon-enhanced computed tomography, single-photon emission computed tomography, perfusion- and diffusion-weighted magnetic resonance imaging, and perfusion computed tomography. In this article, the authors provide a general overview of the currently available perfusion imaging techniques and their applications in treating vasospasm after a patient has suffered a subarachnoid hemorrhage. The use of cerebral perfusion imaging techniques for the early detection of vasospasm is becoming more common and may provide opportunities for early therapeutic intervention to counteract vasospasm in its earliest stages and prevent the occurrence of DINDs.

Thumb Injuries and Instabilities. Part 1: Anatomy, Kinesiology, and Imaging Techniques of the Thumb

2021 ◽  
Vol 25 (02) ◽  
pp. 346-354
Author(s):  
Alain G. Blum ◽  
Marnix T. van Holsbeeck ◽  
Stefano Bianchi
Keyword(s):  
Magnetic Resonance Imaging ◽  
Computed Tomography ◽  
Magnetic Resonance ◽  
Diagnostic Accuracy ◽  
Motor Function ◽  
Crucial Role ◽  
Imaging Techniques ◽  
Resonance Imaging ◽  
Pathologic Lesions ◽  
Essential Function

AbstractThe unique anatomical characteristics of the thumb offer a broad range of motion and the ability to oppose thumb and finger, an essential function for grasping. The motor function of the thumb and its orientation make it particularly vulnerable to trauma. Pathologic lesions encountered in this joint are varied, and imaging techniques play a crucial role in injury detection and characterization. Despite advances in diagnostic accuracy, acute thumb injuries pose a challenge for the radiologist. The complex and delicate anatomy requires meticulous and technically flawless image acquisition. Standard radiography and ultrasonography are currently the most frequently used imaging techniques. Computed tomography is most often indicated for complex fractures and dislocations, and magnetic resonance imaging may be useful in equivocal cases. In this article, we present the relevant anatomy and imaging techniques of the thumb.

Sign in / Sign up

Export Citation Format

Share Document