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Single– versus Multi–Detector Row CT of the Brain: Quality Assessment

2001; Radiological Society of North America; Volume: 219; Issue: 3 Linguagem: Inglês

10.1148/radiology.219.3.r01jn47750

1527-1315

Timothy R. Jones, Richard T. Kaplan, Barton Lane, Scott W. Atlas, Geoffrey D. Rubin,

Advanced MRI Techniques and Applications

PURPOSE: To assess the quality of brain computed tomographic (CT) studies obtained with a four-channel multi–detector row CT scanner compared with those obtained with a single–detector row CT scanner. MATERIALS AND METHODS: Forty-seven patients referred for brain CT were imaged with both single– and multi–detector row scanners. Single–detector row CT images 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-mm-thick sections, which were combined in projection space to create two contiguous 5-mm-thick sections. Two neuroradiologists blinded to the acquisition technique independently evaluated the CT image pairs, which were presented in a stacked mode on two adjacent monitors. Each study was graded by using 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–detector 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 multi–detector row CT in 84 (89%) of 94 studies. The differences in mean posterior fossa artifact scores (P < .001) and mean overall image quality scores (P = .001) were significant. CONCLUSION: Brain CT images obtained with multi–detector row CT resulted in significantly less posterior fossa artifact and were preferred to single–detector row CT images.