关键词: 脑梗死; 辐射剂量; 体层摄影术; X线计算机

Abstract: Objective To determine the radiation dose delivered during “one-stop-shop” computedtomography(CT) imaging for acute ischemic stroke.Methods "One-stop shop" CT examination was performed in 34 patients with symptoms ofacute stroke less than 9 hours. The Protocol includes an un-enhanced CT(NECT) head, CTperfusion(CTP), and CT angiography(CTA) from cranial base to vertex. The weighted volumeCT dose index(CTDIvol) and dose-length products(DLP) were recorded during the CT scanning.Effective doses for each examination were calculated using the DLP and normalized values ofeffective dose per DLP appropriate for the head regions imaged.Results In 34 patients, mean CTDIvol was 845.96±23.78 mGy; mean DLP was2748.92±129.25 mGy×cm; the effective doses ranged from 5.96 to 7.81 mSv, mean effective dosewas 6.32±0.03 mSv. Largest contribution to effective dose was the CTP with a mean effectivedose of 3.51 mSv. Mean effective doses for the NECT, CTA were 2.14±0.27 mSv, 0.67±0.07 mSv,respectively.Conclusion Parameters of “one-stop-shop” CT comply with the standards that American food anddrug administration recommends, and the radiation doses are reasonable, furthermore, “one-stopshop”CT plays a key role in the management of the patients with acute ischemic stroke.

Key words: Brain infarction; Radiation dosage; Tomography; x-ray computed