Radiation dose reduction by adjusting bolus tracking parameters in a 320–detector row scanner

摘要

BackgroundThe importance of bolus tracking (BT) regarding total effective radiation dose (ERD) in the era of advanced coronary computed tomography angiography (CTA) has been ignored. We aimed to investigate whether adjusting BT parameters reduces ERD. MethodsAdults consecutively referred to CTA (n?=?289) in a 320 detector-row scanner were distributed into four BT protocols according to delay time and time between intermittent scans, as follows: A (n?=?70, delay 10s, intermittent scans 1s); B (n?=?79, delay 10s, intermittent scans 2s); C (n?=?68, delay 15s, intermittent scans 1s); and D (n?=?72, delay 15s, intermittent scans 2s). Image quality was assessed. ResultsThe overall ERD in BT and AP were 0.32?±?0.14?mSv and 6.06?±?0.66?mSv, respectively. ERD in BT was different among protocols (A:0.44?±?0.14?mSv; B:0.32?±?0.10?mSv; C:0.28?±?0.14?mSv; D:0.23?±?0.09?mSv; p?