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Brain perfusion CT for acute stroke using a 256-slice CT

Philips CT Clinical Science Philips Healthcare • USA

Improvement of diagnostic information by large volume coverage

Dorn F, Muenzel D, Meier R, Poppert H, Rummeny EJ, Huber A

* This article was originally published in the September, 2011 edition of European Radiology.
To compare a 256-slice CT with a simulated standard CT for brain CT perfusion (CTP). CTP was obtained in 51 patients using a 256-slice CT (128 detector rows, flying z-focus, 8-cm detector width, 80 kV, 120 mAs, 20 measurements, 1 CT image/2.5 s). Signal-to-noise ratios (SNR) were compared in grey and white matter. Perfusion maps were evaluated for cerebral blood flow (CBF), cerebral blood volume (CBV) and mean transit time (MTT) in hypo-perfused areas and corresponding contralateral regions. Two reconstructed 10-mm slices for simulation of a standard CT (SDCT) were compared with the complete data sets (large-volume CT, LVCT). Adequate image quality was achieved in 50/51 cases. SNR were significantly different in grey and white matter. A perfusion deficit was present in 27 data sets. Differences between the hypo-perfusions and the control regions were significant for MTT and CBF, but not for CBV. Three lesions were missed by SDCT but detected by LVCT; twenty-four lesions were covered incompletely by SDCT, and six by LVCT. Twenty-one lesions were detected completely by LVCT, but none by SDCT. CTP imaging of the brain using an increased detector width can detect additional ischaemic lesions and cover most ischaemic lesions completely.
For more information about this publication, check out the PubMed listing for this article.

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Nov 14, 2011

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brain, Brain Perfusion, Head, image quality, lesions, Neuro, stroke

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