Abstract:

Purpose. Was to compare beam loading and quality of coronary arteries’ imaging (CA) in case of using the 64-lise computed tomography (MSCT) in retro-and prospective electrocardiographic synchronization mode.

Materials and methods. 57 patients with coronar arteries disease suspicious were examined with the help of computed tomography (CT) coronarography in prospective (n = 27) and retrospective (n = 30) EKG-synchronization modes. All the experiments were held on multislice Discovery CT 750 MD («General Electric»). The quality of obtained CR images was estimated subjectively – from 1 (perfect quality) to 4 (non-

diagnostic).

Results. The analyses of obtained images during retro-and prospective EKG-synchronization did not reveal serious differences (1,4 ± 0,38

and 1,5 ± 0,46 accordingly). The effective dose during prospective EKG-synchronization was 59% less than during retrospective EKG-synchronization (3,8 ± 0,83 mSv and 9,3 ± 2,5 mSv, р < 0,05).

Conclusion. CT-coronarography in prospective EKG-synchronization mode leads to essential decrease in beam loading on the patient without deterioration of the received image quality.  

References 

1.    Gaemperli O. et al. Accuracy of 64-slice CT angiography for the detection of functionally relevant coronary stenoses as assessed with myocardial perfusion SPECT. Eur. J Nucl. Med. Mol. Imaging. 2007; 34: 1162–1171.

2.    Mollet N.R. et al. High-resolution spiral computed tomography coronary angiography in patients referred for diagnostic conventional coronary angiography. Circulation. 2005; 112: 2318–2323.

3.    Raff G.L. et al. Diagnostic accuracy of noninvasive coronary angiography using 64-slice spiral computed tomography. J. Am. Col. Cardiol. 2005; 46: 552–557.

4.    Scheffel H. et al. Accuracy of dual-source CT coronary angiography. First experience in a high pre-test probability population without heart rate control. Eur. Radiol. 2006; 16: 2739–2747.

5.    Husmann L. et al. Comparison of diagnostic accuracy of 64-slice computed tomography coronary angiography in patients with low, intermediate and high cardiovascular risk.

6.    Acad. Radiol. 2008; 15: 452–461. Leschka S. et al. Low kilovoltage cardiac dual-source CT. Аttenuation, noise, and radiation dose. Eur. Radiol. 2008; 18: 1809–1817.

7.    Hausleiter J. et al. Radiation dose estimates from cardiac multislice computed tomography in daily practice. Impact of different scanning protocols on effective dose estimates. Circulation. 2006; 113: 1305–1310.

8.    Husmann L. et al. Feasibility of low-dose coronary CT angiography. First experience with prospective ECGgating. Eur. Heart. J. 2008; 29:191–197.

9.    Herzog B.A. et al. Accuracy of low-dose computed tomography coronary angiography using prospective electrocardiogram triggering. First clinical experience. Eur. Heart. J. 2008; 29: 3037–3042.

10.  Husmann L. et al. Diagnostic accuracy of computed tomography coronary angiography and evaluation of stress-only single-photon emission computed tomography / computed tomography hybrid imaging. Сomparison of prospective electrocardiogram-triggering vs. retrospective gating. Eur. Heart. J. 2009; 30:600–607.

11.  Hsieh J. et al. Step-and-shoot data acquisition and reconstruction for cardiac x-ray computed tomography. Med. Phys. 2006; 33:4236–4248.

12.  Earls J.P. et al. Prospectively gated trans-verse coronary CT angiography versus retrospectively gated helical technique. Improved image quality and reduced radiation dose. Radiology. 2008; 246: 742–753.

13.  Shuman W.P. et al. Prospective versus retrospective ECG gating for 64-detector CT of the coronary arteries.