How patient off-centering impacts organ dose and image noise in pediatric head and thoracoabdominal CT.

• Patient off-centering has a substantial impact on organ radiation dose and image noise in pediatric CT. • Impact of patient off-centering on radiation dose and noise differs between head and thoracoabdominal CT. • Differences are caused by both ATCM and bowtie filter in thoracoabdominal CT, but mainly by bowtie filter in head CT.