Brain perfusion CT for acute stroke using a 256-slice CT: improvement of diagnostic information by large volume coverage
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : F. Dorn & D. Muenzel & R. Meier & H. Poppert & E. J. Rummeny & A. Huber
- چاپ و سال / کشور: 2011
Description
Objectives To compare a 256-slice CT with a simulated standard CT for brain CT perfusion (CTP). Methods CTP was obtained in 51 patients using a 256-slice CT (128 detector rows, flying z-focus, 8-cm detector width, 80 kV, 120mAs, 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 hypoperfused 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). Results 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 hypoperfusions and the control regions were significant for MTT and CBF, but not for CBV. Three lesions were missed by SDCT but detected by LVCT; 24 lesions were covered incompletely by SDCT, and 6 by LVCT. 21 lesions were detected completely by LVCT, but none by SDCT. Conclusions CTP imaging of the brain using an increased detector width can detect additional ischaemic lesions and cover most ischaemic lesions completely.
Eur Radiol (2011) 21:1803–1810 DOI 10.1007/s00330-011-2128-0 Received: 12 October 2010 / Revised: 7 March 2011 / Accepted: 10 March 2011 / Published online: 19 May 2011
