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Medical Physics |
1 From the Department of Radiology (D.F., G.D.R., P.R.H., C.F.B.) and Radiological Science Library (D.S.P., S.Y.Y., S.N.), Stanford University School of Medicine, 300 Pasteur Dr, S-072 Stanford, CA 94305-5105. From the 1999 RSNA scientific assembly. Received August 2, 1999; revision requested October 5; revision received October 28; accepted November 10. D.F. supported by the Austrian Science Fund, Vienna. G.D.R. supported by National Institutes of Health grant R01 HL 58915. D.S.P. supported by the National Library of Medicine, Bethesda, Md. P.R.H. supported by the Swiss National Science Foundation and the Holderbank Foundation, Zurich, Switzerland. S.N. supported by National Institutes of Health grant R01 CA 72023. Manuscript preparation supported in part by the Ludwig Boltzmann Institute for Radiological Sciences, Vienna, Austria. Address correspondence to G.D.R. (e-mail: grubin@stanford.edu).
PURPOSE: To compare the effects of acquisition parameters on the magnitude and appearance of artifacts between single and multiple detector-row helical computed tomography (CT).
MATERIALS AND METHODS: A cylindric (12.7 x 305.0-mm) acrylic rod inclined 45° relative to the z axis was scanned at the isocenter and 100 mm from the isocenter with single detector-row (single-channel) helical CT (beam width, 1–10 mm; pitch, 1.0, 2.0, or 3.0) and multiple detector-row (four-channel) helical CT (detector width, 1.25, 2.5, 3.75, and 5 mm; pitch, 0.75 or 1.5). The SD of radius measurements along the rod (SDr) was used to quantify artifacts in all 72 data sets and to analyze their frequency patterns. Volume-rendered images of the data sets were ranked by six independent and blinded readers; findings were correlated with acquisition parameters and SDr measurements.
RESULTS: SDr was smaller in four- than in single-channel helical CT for any given table increment (TI). In single-channel helical CT, SDr increased linearly with beam width and geometrically with pitch. In four-channel helical CT, SDr measurements were directly proportional to the TI, regardless of the detector width and pitch combination used. Off-center object position on average increased SDr by a factor of 1.6 for single-channel helical CT and by a factor of 2.0 for four-channel helical CT. Subjective rankings of image quality correlated excellently with SDr (Spearman r = 0.94, P < .001).
CONCLUSION: Artifacts are quantitatively and subjectively smaller with four- compared with single-channel helical CT for any given TI.
Index terms: Computed tomography (CT), artifact, **.12113 • Computed tomography (CT), helical technology • Computed tomography (CT), three-dimensional • Test objects
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