0014: Feasibility, image quality and radiation dose of Coronary CT Angiography (CCTA) in obese patients using a new generation 256 Multi-Detector CT (MDCT) - 12/02/16
, Jacques Feignoux, Jean-Louis SablayrollesRésumé |
Introduction |
To evaluate feasibility, image quality and radiation dose of CCTA in obese patients using new generation 256-MDCT.
Methods and materials |
Thirty consecutive obese patients (Body Mass Index (BMI)>30) undergoing CCTA on a 256-MDCT (Revolution CT, General Electric) were retrospectively included. Prevalence and impact on diagnosis of motion and step artifacts were independently evaluated by two experienced readers using a 3-point scale (0: no artifact; 1: artifacts without interference on diagnosis; 2: artifacts interfere with diagnosis) and percentage of assessable coronary segments was calculated. Contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) were measured for quantitative assessment. Radiation dose was evaluated by calculating the mean effective dose (ED).
Results |
Mean BMI was 36.0±5.9kg/m 2 with a mean HR of 91.4.0±48.9 bpm. Mean injected contrast volume (Iohexol 350) was 73.0±11.2mL. On a per-patient analysis, all the coronary segments were assessable in 29 (97%) patients. Only 2 coronary segments were not assessable in 1 patient due to motion arte-facts resulted in a coronary segments assessability of 99.6% (455/457 segments) in the overall population. No step artifact was observed whereas motion arte-facts (3-point scale score of 0.27±0.9) were infrequent and do not interfere with diagnosis. The mean CNR and mean SNR were respectively 10.0±2.6 and 11.1±2.0. ED remains low with an average of 2.71±1.6 mSv.
Conclusion |
CCTA is feasible in obese patients using a new generation 256-MDCT providing good image quality and low radiation dose in this challenging population.
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Vol 8 - N° 1
P. 18 - janvier 2016 Retour au numéro
Article précédent
- 0256: Accuracy of visual estimation compared to objective anatomical and functional measurement, QCA and FFR, in coronary lesions
- Julien Adjedj, Gabor Toth, Guiseppe Di Gioia, Angela Ferrara, Vincent Flore, Mariano Pellicano, Emanuele Barbato, William Wijns, Bernard de Bruyne
- 0012: Comparison of Coronary CT Angiography (CCTA) for patients with high heart rates using a new generation 256 Multi-Detector CT (MDCT) and a 64-MDCT: image quality and radiation dose
- Laurent Macron, Jean-Louis Sablayrolles, Jacques Feignoux
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