Single- versus multi-detector row CT of the brain: Quality assessment

PURPOSE: To assess the quality of brain computed tomographic (CT) studies o btained with a four-channel multi-detector row CT scanner compared with tho se obtained with a single-detector row CT scanner. MATERIALS AND METHODS: Forty-seven patients referred for brain CT were imag ed with both single- and multi-detector row scanners. Single-detector row C T Ii-rages were acquired by using a 5-mm-collimated beam in the transverse mode. Multi-detector row CT images were acquired in four simultaneous 2.5-m m-thick sections, which were combined in projection space to create two con tiguous 5-mm-thick sections. Two neuroradiologists blinded to the acquisiti on technique independently evaluated the CT image pairs, which were present ed in a stacked mode on two adjacent monitors. Each study was graded by usi ng a five-point scale for posterior fossa artifact, overall image quality, and overall preference. RESULTS: Multi-detector row CT studies were acquired 1.8 times faster than single-detector row CT studies (0.92 vs 0.52 section per second). Multi-det ector row CT posterior fossa artifact was less than single-detector row CT posterior fossa artifact in 87 (93%) of 94 studies. Overall preference was expressed for multidetector row CT in 84 (89%) of 94 studies. The differenc es in mean posterior fossa artifact scores (P < .001) and mean overall imag e quality scores (P = .001) were significant. CONCLUSION: Brain CT image obtained with multi-detector row CT resulted in -significantly less posterior fossa artifact and were preferred to single-d etector row CT images.