Methods: Cerebral CTP maps were retrospectively obtained from 20 patients with suspicion of acute ischemic stroke and served as the reference standard. To simulate a 4s gap for interleaving CTP with vCTA, we eliminated one acquisition at various time points of CTP starting from the bolus-arrival-time (BAT). Optimal timing of the vCTA was evaluated. At the time point with least errors, we evaluated elimination of a second time point (6s gap).
Results: Mean absolute percentage errors of all perfusion values remained below 10% in all patients when eliminating any one time point in the CTP sequence starting from the BAT. Acquiring the vCTA 2s after reaching a threshold of 70HU resulted in the lowest errors (mean<3.0%). Eliminating a second time point still resulted in mean errors <3.5%. CBF/CBV showed no significant differences in perfusion values except MTT. However, the percentage errors were always below 10% compared to the original protocol.Conclusion: Interleaving cerebral CTP with neck CTA is feasible with minor effects on the perfusion values.
A pdf file of this publication is available for personal use. Enter your e-mail address in the box below and press the button. You will receive an e-mail message with a link to the pdf file.