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| Clinical study of different acquisition time windows on reducing CT radiation dose |
| XING Jie1, LI Juntang1, HAO Dapeng2 |
1. Department of Radiology, Qingdao Municipal Hospital Affiliated to Qingdao University, Qingdao 266071 China;
2. Department of Radiology, Affiliated Hospital of Qingdao University |
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Abstract Objective To study the influence of different heart rates, acquisition time windows and artifacts in CT imaging diagnosis.Methods 120 patients who underwent coronary CTA scan in our hospital from August 2017 to September 2019 were selected for this study. Coronary CTA scan was performed for each patient, and the optimal imaging period for patients with different heart rates was determined by the phase. The difference between the optimal imaging phase and acquisition time window of patients with different heart rates，the difference between subjective and objective evaluation of image quality, and the radiation of different acquisition time windows were analyzed.Results The optimal imaging phase and acquisition time window of low heart rate group were higher than those of other two groups (P < 0.05); the subjective scores of image quality of right coronary artery, left anterior descending branch and circumflex branch in low heart rate group were significantly higher than those of other two groups (P < 0.05); the CT value and contrast noise ratio (CNR) of the right coronary artery, left anterior descending branch and circumflex branch in low heart rate group were significantly higher than those of other two groups (P < 0.05), and the fat noise was significantly lower than those of the other two groups (P < 0.05). There was no significant difference between the effective dose index of the best acquisition time window and the effective dose index of the whole cardiac cycle among the three groups (P > 0.05). At the same time, the effective dose index of the best acquisition time window had no statistical significance. It was significantly lower than the total effective dose index (P < 0.05).Conclusion In the diagnosis of patients with low heart rate, the time of image acquisition should be in the middle and end diastole, while in the diagnosis of patients with high heart rate, the time of image acquisition should be in systole.
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Received: 07 September 2019
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