Dose and image quality comparison between prospectively gated axial and retrospectively gated helical coronary CT angiography.
Br J Radiol
; 84(997): 51-7, 2011 Jan.
Article
in En
| MEDLINE
| ID: mdl-21172966
ABSTRACT
OBJECTIVE:
Our aim was to compare image quality, coronary segment assessability and radiation dose in prospectively gated axial (PGA) coronary CT angiography (CTA) and conventional retrospectively gated helical (RGH) coronary CTA.METHODS:
Institutional review committee approval and informed consent were obtained. RGH CTA was performed in 41 consecutive patients (33 males, 8 females; mean age 52.6 years), then the PGA CTA technique was evaluated in 41 additional patients (24 males, 17 females; mean age 57.3 years) all with a pre-scan heart rate of ≤70 beats per minute (bpm). Two radiologists, blinded to clinical information, independently scored subjective image quality on a five-point ordinal scale.RESULTS:
The mean effective dose in the PGA group was 4.7±0.9 mSv, representing a 69% dose reduction compared with the RGH CTA group (15.1±1.9 mSv, p<0.001). The mean segmental image quality score was significantly higher in the PGA group (3.4 vs 3.2) than in the RGH CTA group (p<0.005). The percentage of assessable segments was 98.1% in the PGA group and 97.3% in the RGH group (p = 0.610).CONCLUSION:
PGA CTA offers a significant reduction in radiation dose compared with RGH CTA, with comparable image quality for patients with heart rates below 70 bpm.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Coronary Artery Disease
/
Coronary Angiography
/
Tomography, Spiral Computed
Type of study:
Observational_studies
Limits:
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Br J Radiol
Year:
2011
Document type:
Article
Affiliation country: