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DOI: 10.1148/rg.271065037
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RadioGraphics 2007;27:49-62
© RSNA, 2007

EDUCATION EXHIBIT

Price of Isotropy in Multidetector CT1

Neal C. Dalrymple, MD, Srinivasa R. Prasad, MD, Fadi M. El-Merhi, MD and Kedar N. Chintapalli, MD

1 From the Department of Radiology, University of Texas Health Science Center at San Antonio, Mail Code 7800, 7703 Floyd Curl Dr, San Antonio, TX 78229-3900. Presented as an education exhibit at the 2005 RSNA Annual Meeting. Received March 21, 2006; revision requested June 5 and received July 10; accepted July 11. All authors have no financial relationships to disclose. Address correspondence to N.C.D. (e-mail: dalrymplen{at}uthscsa.edu).

Recent advances in multidetector computed tomography (CT) have made isotropic data acquisition feasible for nearly every application. The benefits of routine use of isotropic data for image display and interpretation have been described in the literature and at educational conferences. However, there is usually a trade-off in the form of an increased radiation dose to the patient. The parameters that affect the radiation dose vary considerably in accordance with the CT scanner design, and those variations determine the cost in dose increase relative to the voxel size. The detector configuration and beam collimation (narrow or wide) used for a particular acquisition also affect the voxel size and the relationship between spatial resolution and the radiation dose. By closely comparing the quality of multidetector CT images obtained with different detector configurations on scanners with four, 16, 40, and 64 channels and the estimated radiation exposure incurred with each option, radiologists may achieve an understanding of the relationship between radiation dose and voxel size. This understanding, in turn, may help balance the need for diagnostic image quality against the concern for patient safety.

© RSNA, 2007






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