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

• Published in: Journal of cardiovascular computed tomography 2018-07, Vol.12 (4), p.312-315
• Main Authors: Matsumoto, Jacqueline Kioko Nishimura, Assuncao-Jr, Antonildes Nascimento, Dantas Junior, Roberto Nery, Araujo-Filho, Jose de Arimateia Batista, Andrade, Solange de Sousa, Nomura, Cesar Higa, Parga, Jose Rodrigues
• Format: Article
• Language: English
• Subjects: 320 detector-row scanner; Bolus tracking; Coronary computed tomography angiography; Image quality; Radiation dose reduction
• ISSN: 1934-5925; 1876-861X
• DOI: 10.1016/j.jcct.2018.03.009

The 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. Adults 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. The 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