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Low-Dose CT of the Abdomen: Evaluation of Image Improvement with Use of Noise Reduction Filters—Pilot Study¹

¹ From the Department of Radiology, Massachusetts General Hospital, Harvard Medical School, White 270-E, 55 Fruit St, Boston, MA 02114 (M.K.K., M.M.M., D.V.S., M.A.B., P.F.H., E.H., S.S.); and GE Medical Systems, Milwaukee, Wis (G.B.A., T.L.T.). Received June 10, 2002; revision requested August 20; revision received September 5; accepted October 24. Supported in part by a grant from GE Medical Systems. Address correspondence to S.S. (e-mail: ssaini@partners.org).

View larger version (26K): [in a new window]   Figure 1. Flowchart depicts basic processing steps of noise reduction filters used in the present study.

View larger version (143K): [in a new window]   Figure 2a. Contrast-enhanced transverse CT images of the abdomen of a 68-year-old man. All images were obtained at the same level with 140 kVp and 0.8-second gantry rotation time. (a) Baseline standard-dose CT image acquired at 260 mA. (b) Baseline low-dose CT image acquired at 130 mA. (c, d) Low-dose CT images postprocessed with filters (c) C and (d) F. Note the substantial improvement in image quality of c and d as compared with b; also note the edge enhancement (arrow) on d.

View larger version (157K): [in a new window]   Figure 2b. Contrast-enhanced transverse CT images of the abdomen of a 68-year-old man. All images were obtained at the same level with 140 kVp and 0.8-second gantry rotation time. (a) Baseline standard-dose CT image acquired at 260 mA. (b) Baseline low-dose CT image acquired at 130 mA. (c, d) Low-dose CT images postprocessed with filters (c) C and (d) F. Note the substantial improvement in image quality of c and d as compared with b; also note the edge enhancement (arrow) on d.

View larger version (149K): [in a new window]   Figure 2c. Contrast-enhanced transverse CT images of the abdomen of a 68-year-old man. All images were obtained at the same level with 140 kVp and 0.8-second gantry rotation time. (a) Baseline standard-dose CT image acquired at 260 mA. (b) Baseline low-dose CT image acquired at 130 mA. (c, d) Low-dose CT images postprocessed with filters (c) C and (d) F. Note the substantial improvement in image quality of c and d as compared with b; also note the edge enhancement (arrow) on d.

View larger version (143K): [in a new window]   Figure 2d. Contrast-enhanced transverse CT images of the abdomen of a 68-year-old man. All images were obtained at the same level with 140 kVp and 0.8-second gantry rotation time. (a) Baseline standard-dose CT image acquired at 260 mA. (b) Baseline low-dose CT image acquired at 130 mA. (c, d) Low-dose CT images postprocessed with filters (c) C and (d) F. Note the substantial improvement in image quality of c and d as compared with b; also note the edge enhancement (arrow) on d.