Abstract
Objectives: For dual-source cardiac computed tomography (CT) scans without heart rate (HR) control, the influence of body habitus on quality is uncertain. We evaluated study quality across a range of HRs and body size.
Methods: One hundred sixty subjects were randomly selected for 4 HR groups (<70, 70.79, 80.89, .90 beats per minute) from 703 subjects who underwent cardiac CT without premedication. Coronary visualization quality was scored on a 3-point scale (1, nondiagnostic; 2, diagnostic; 3, excellent).
Results: Ninety-nine percent of coronaries were diagnostic quality. Six vessels were nondiagnostic, mostly due to motion. Nondiagnostic or diagnostic scores (<3) were greatest in the group with HR ofmore than or equal to 90 beats per minute. All normal weight subjects had excellent quality, but 6% of vessels in overweight and 17% in obese subjects had diagnostic scores less than 3. The mean effective dose was 11.4 mSv and correlated with body size.
Conclusions: Diagnostic quality cardiac CT examinations can be obtained without premedication regardless of body size.
Original language | English (US) |
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Pages (from-to) | 949-955 |
Number of pages | 7 |
Journal | Journal of computer assisted tomography |
Volume | 38 |
Issue number | 6 |
DOIs | |
State | Published - Dec 11 2014 |
Keywords
- Body mass index
- Cardiac CT
- Heart rate
- Image quality
- β-blockers
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging