New Abdominal CT Technique Reduces Dose, Noise

Adaptive statistical iterative reconstruction offers alternative to standard CT for abdominal imaging

FRIDAY, Aug. 20 (HealthDay News) -- A new low-dose computed tomography (CT) technique appears to be an effective alternative to standard CT for abdominal scans, with reduced radiation dose and less imaging noise, according to research published in the September issue of the American Journal of Roentgenology.

Yoshiko Sagara, M.D., of Oita University in Japan, and colleagues conducted abdominal low-dose CT with adaptive statistical iterative reconstruction (ASIR) on 53 patients who had previously had contrast-enhanced routine-dose CT with filtered back projection (FBP). They compared the image quality, noise, and radiation dose of the two imaging methods.

The researchers found the radiation dose lower by 23 to 66 percent depending on body mass index in low-dose CT with ASIR compared to routine-dose CT with FBP, and the quantitative and qualitative assessment of image noise was significantly lower for the ASIR images. Image sharpness, however, was lower with ASIR.

"Compared with routine-dose CT with FBP, abdominal low-dose CT with ASIR significantly reduces noise, thereby permitting diagnostic abdominal examinations with lower (by 23 to 66 percent) radiation doses. Despite reduced image sharpness in average and small patients, low-dose CT with ASIR had diagnostic acceptability comparable to that of routine-dose CT with FBP," the authors write.

Three authors disclosed a research agreement with GE Healthcare.

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