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British Journal of Radiology 74 (2001),552-555 © 2001 The British Institute of Radiology

Short communication

Reproducibility of quantitative CT perfusion imaging

J H Gillard, BSc, MD, FRCR 1 N M Antoun, FRCP, FRCR 1 N G Burnet, FRCS, FRCR 2 and J D Pickard, FRCS 3

Departments of 1Radiology, 2Oncology and 3Neurosurgery, Addenbrooke's Hospital and the University of Cambridge, Cambridge CB2 2QQ, UK

The ability to demonstrate regions of abnormal cerebral blood flow in the setting of acute stroke is of diagnostic and prognostic importance. It may also influence therapeutic strategies. The advantage of CT perfusion imaging is its ability to give quantifiable measurements of cerebral blood flow on any modern CT machine without the need to buy specialized equipment. The aim was to assess day-to-day variability of values of cerebral blood volume obtained with this technique. Seven patients with cerebral gliomas were studied using dynamic CT perfusion imaging on two occasions, approximately 24 h apart to reduce variability from diurnal variations. Regions of interest were produced in predominately middle cerebral artery locations in both hemispheres on the first and second CT perfusion studies. Absolute values for cerebral blood flow were produced for these regions and were correlated with flows obtained in the same regions of interest on the follow-up study. The Pearson correlation coefficient obtained was 0.884. CT perfusion imaging is easily performed on conventional modern CT equipment and demonstrates little variability in measures of absolute cerebral blood flow within individuals when studied on two occasions within 24 h.




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