MDCT of chest, abdomen, and pelvis using attenuation-based automated tube voltage selection in combination with iterative reconstruction: an intrapatient study of radiation dose and image quality.

OBJECTIVE. The purpose of this study was intrapatient comparison of image quality and radiation dose between MDCT scans of the chest, abdomen, and pelvis obtained with attenuation-based automated kilovoltage selection and sinogram-affirmed iterative reconstruction and scans obtained with standard kilovoltage selection and a filtered backprojection image reconstruction algorithm. MATERIALS AND METHODS. One hundred one oncology patients who had undergone two chest, abdominal, and pelvis CT scans within 1 year were imaged with standard tube voltage selection of 120 kVp using a filtered backprojection reconstruction algorithm (protocol 1) and with attenuation-based automated tube voltage selection using an iterative reconstruction algorithm (protocol 2). Radiation dose parameters (volumetric CT dose index [CTDIvol], dose-length product, and effective dose) as well as image noise, signal-to-noise ratio, and contrast-to-noise ratio were compared. Two independent radiologists evaluated image quality and sharpnes...