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[Initial experience with prospectively triggered, sequential CT coronary angiography on a 128-slice scanner].

K Anders¹, U Baum, S Gauss

¹Radiologisches Institut, Friedrich-Alexander-Universität Erlangen-Nürnberg. katharina.anders@uk-erlangen.de

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Summary

Sequential coronary CT angiography (CTA) with a 128-slice scanner offers feasible image quality for detecting coronary plaque. This method achieves lower effective dose values compared to spiral CTA, making it a promising alternative.

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Area of Science:

Radiology and Imaging
Cardiovascular Imaging
Medical Technology

Background:

Coronary CT angiography (CTA) using low-pitch scanning and ECG-gated reconstruction is effective for detecting coronary plaque.
However, conventional spiral CTA results in considerable radiation dose exposure.
There is a need for dose-optimized CTA techniques for coronary imaging.

Purpose of the Study:

To evaluate image quality, artifacts, and radiation dose of sequential coronary CTA.
To assess the feasibility of using a 128-slice scanner with a temporal resolution of 150 ms.
To compare dose values with traditional spiral coronary CT scans.

Main Methods:

Twenty patients underwent sequential coronary CTA using a 128-slice scanner (120 kV, 200 ref mAs, 150 ms temporal resolution).
Image quality was assessed on a 4-point scale, and artifacts were evaluated.
Radiation dose was estimated from the dose length product, with a mean effective dose of 3.6 mSv.

Main Results:

Mean heart rate was 62 bpm with beta-blocker pretreatment.
5% of segments were non-diagnostic, primarily due to calcifications and motion artifacts.
Mean effective dose was 3.6 mSv, significantly lower than spiral coronary CT.

Conclusions:

Sequential coronary CTA is technically feasible in select patients with heart rate control and breath-hold compliance.
The effective dose is substantially lower than that of spiral coronary CT scans.
This technique offers a dose-reduced alternative for coronary plaque detection.