Figure 1.
Flow Chart of References Searching.
The diagram shows the exact criteria for the inclusion and exclusion of subjects.
Table 1.
Baseline Characteristics of the Study.
Figure 2.
Methods of Traditional and Doppler-Guided Prospective ECG Gating.
A) presents a schematic view of traditional prospective ECG gating. The exposure window is adjusted to cover both systole and diastole. B) offers a schematic view of Doppler-guided prospective ECG gating. The exposure window was adjusted at systole or diastole.
Table 2.
Image Quality in Different Sub-groups.
Figure 3.
Dose of Traditional and Doppler-Guided Prospective ECG Gating.
Overall, applying Doppler-guided prospective ECG gating, the patient dose of CTA was significantly lower than that of traditional prospective ECG gating.
Figure 4.
Example of CTA with Doppler-Guided Prospective ECG Gating.
A male patient with a BMI of 21.5. The predicted length of DTD was 81 ms, and the exposure timing was preset at 30%–50% during the R-R interval. The scanning heart rate was 78 bpm. CTA with Doppler-guided prospective ECG gating (A) and ICA (B) showed stenosis of LAD (white arrows). The effective dose of CTA was 3.2 mSv.
Table 3.
Diagnostic Accuracy of Traditional and Doppler-Guided Group at Patient-, Artery- and Segment- levels.