Coronary computed tomography angiography (CCTA) has evolved to an unprecedented rate during the last decade.
It has become an effective and accurate tool for cardiac imaging with a growing list of clinical indications .
The detection of coronary disease in the investigation of atypical chest pain patients at low and intermediate risk with non-contributory functional tests is one of the main indications.
CCTA is also useful for acute chest pain patients at low risk with normal...
Methods and materials
A retrospective survey was carried out in 2013 within 8 academic and non–academic French hospitals specialized in cardiac imaging.
460 CCTA performed in a 3 months period were collected.
The CT scanners of these centres were 64 to 320-detectors CT scanners from different manufacturers using different routine protocols,
taking differently into account the patient BMI (Table 1).
Prospective ECG-gating mode and iterative reconstruction algorithm were available on six of them. Table 1. CT...
The large gap in dose between the prospective and the retrospective ECG gating modes required to analyse separately the CTDI vol and DLP for the two modes.
Mean values are presented in table 2 for each centre. Table 2 .
Mean values of CTDI vol and DLP per centre,
for CCTA performed with prospective and retrospective ECG-gating modes Centre A B C D E F G H Retrospective mode n 16 49 49 49 49 49 mean CTDIvol ± SD (mGy) 34±13 64±9 25±7 38±14 21±11 26±15 mean DLP ± SD (mGy.cm) 752 ±257 1144 ±168...
Prospective ECG gating and IR are efficient dose reduction techniques in CCTA but they do not exempt the centres from a more global optimization approach.
Whatever the brand and the generation of CT scanner,
a significant dose optimization is possible,
using simple methods such as tube current and voltage adaptation to the BMI.
This study confirms the large variability in patient doses in CCTA,
underlining the need for cardiac acquisition protocols optimization.
The availability of National...
Master Degree in Medical Physics.
Institut de Radioprotection et de Sûreté Nucléaire.
Radiation Protection Ingenieer.Institut de Radioprotection et de Sûreté Nucléaire.
Pesenti-Rossi (MD) .
Clinique Ambroise Paré.
Service de cardiologie.
Convers-Domart (MD) .
Service de cardiologie.
Ou (MD) ....
 Lin EC, Bredeweg RP,
Sicuro PL et al.
Coronary CTAngiography. http://emedicine.medscape.com/article/1603072-overview#showall .
Achieved 27 December 2013.  Hammas S,
Amato A,Amabile N,Pesenti Rossi D andCaussin C.
Use of multislice computed tomography angiography in percutaneous coronary intervention.
2011;3(4):417-419.  Pesenti Rossi D,
Coronary aorto-ostial analysed by...