This poster is published under an
open license. Please read the
disclaimer for further details.
Keywords:
Cardiac, Radioprotection / Radiation dose, Radiation physics, CT, CT-Angiography, Dosimetry, Equipment, Radiation safety, Dosimetric comparison, Education and training
Authors:
F. Mafalanka1, J.-L. Rehel1, D. Pesenti-Rossi2, L.-P. Christiaens3, R. Convers-Domart4, P. Ou5, E. Schouman-Claeys5, M. Sirol5, C. Etard1; 1Fontenay-aux-Roses/FR, 2Neuilly-sur-Seine/FR, 3Poitiers/FR, 4Le Chesnay/FR, 5Paris/FR
DOI:
10.1594/ecr2014/B-0779
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 scanners of the 8 centres included in this study
Centre
|
CT Scanner
|
Gantry rotation (s)
|
Detector array (mm)
|
ECG gating mode
|
Iterative reconstruction
|
Retrospective
|
Prospective
|
A
|
GE Discovery CT 750 HD
|
0.35
|
64x0.625
|
yes
|
yes
|
yes
|
B
|
GE Discovery CT 750 HD
|
0.35
|
64x0.625
|
yes
|
yes
|
yes
|
C
|
SIEMENS Sensation 64
|
0.33
|
64x0.6
|
yes
|
no
|
no
|
D
|
GE Lightspeed VCT 64
|
0.35
|
64x0.625
|
not used in routine
|
yes
|
yes
|
E
|
GE Lightspeed VCT 64
|
0.35
|
64x0.625
|
yes
|
no
|
no
|
F
|
TOSHIBA Aquilion 320
|
0.35
|
320x0.5
|
not used in routine
|
yes
|
yes
|
G
|
SIEMENS Somatom Definition AS+
|
0.30
|
64x0.6
|
yes
|
not used in routine
|
yes
|
H
|
PHILIPS Brilliance 64
|
0.4
|
64x0.625
|
yes
|
yes
|
yes
|
Acquisition parameters,
Computed Tomography Dose Index (CTDIvol) and Dose Length Product (DLP) related to about 50 sequential CCTA were collected in each centre.
This study focused on CCTA performed for assessment of coronary artery disease.
Calcium scoring was excluded,
as well as evaluation of bypass graft patency and preparation of TAVI.
The study was restricted to adults,
but no selection criteria on gender or patient BMI was applied.
When both prospective and retrospective ECG-gating modes were used in the same centre,
a sample of about 50 CCTA for each mode was collected.
Image quality was considered satisfactory by clinicians in each centre and has not been evaluated in this study.
Data were analysed by the French National Institute for Radiation Protection and Nuclear Safety (IRSN).