Impact of iterative reconstruction on image quality and radiation dose in multidetector CT of large body size adults

To compare image quality and radiation dose using Adaptive Statistical Iterative Reconstruction (ASiR) and Filtered Back Projection (FBP) in patients weighing a parts per thousand yen91 kg. In this Institution Review Board-approved retrospective study, single-phase contrast-enhanced abdominopelvic CT examinations of 100 adults weighing a parts per thousand yen91 kg (mean body weight: 107.6 +/- 17.4 kg range: 91-181.9 kg) with (1) ASiR and (2) FBP were reviewed by two readers in a blinded fashion for subjective measures of image quality (using a subjective standardized numerical scale and objective noise) and for radiation exposure. Imaging parameters and radiation dose results of the two techniques were compared within weight and BMI sub-categories. All examinations were found to be of adequate quality. Both subjective (mean = 1.4 +/- 0.5 vs. 1.6 +/- 0.6, P < 0.05) and objective noise (13.0 +/- 3.2 vs.19.5 +/- 5.7, P < 0.0001) were lower with ASiR. Average radiation dose reduction of 31.5 % was achieved using ASiR (mean CTDIvol. ASiR: 13.5 +/- 7.3 mGy; FBP: 19.7 +/- 9.0 mGy, P < 0.0001). Other measures of image quality were comparable between the two techniques. Trends for all parameters were similar in patients across weight and BMI sub-categories. In obese individuals, abdominal CT images reconstructed using ASiR provide diagnostic images with reduced image noise at lower radiation dose. aEuro cent CT images in obese adults are noisy, even with high radiation dose. aEuro cent Newer iterative reconstruction techniques have theoretical advantages in obese patients. aEuro cent Adaptive statistical iterative reconstruction should reduce image noise and radiation dose. aEuro cent This has been proven in abdominopelvic CT images of obese patients.