Dual Source CT High Pitch Prospective Scan in Triple-rule-out Acute Chest Pain Examination
10.3969/j.issn.1005-5185.2015.03.012
- VernacularTitle:双源CT大螺距前瞻扫描在胸痛三联症成像中的应用
- Author:
Lianzhi TANG
;
Hong JIANG
;
Baojin WU
;
Ting MAO
;
Yang YU
- Publication Type:Journal Article
- Keywords:
Coronary artery disease;
Pulmonary embolism;
Pulmonary artery;
Aneurysm,dissecting;
Triple-rule-out;
Acute disease;
Tomography,spiral computed;
Heart rate;
Radiation dosage
- From:
Chinese Journal of Medical Imaging
2015;(3):200-203,208
- CountryChina
- Language:Chinese
-
Abstract:
PurposeTo investigate the image quality of Dual Source CT (DSCT) high pitch prospective scan in acute chest pain examination by using triple-rule-out (TRO) protocol and its responses to heart beat rate change.Materials and Methods Thirty-two consecutive patients who planned to undergo TRO acute chest pain examination were enrolled and randomly divided into research group and control group. The conventional retrospective spiral scanning protocol was applied to the patients in the control group, while the high pitch prospective spiral scanning mode was used in the research group. CT value, noise level, SNR, CNR and radiation dosage in aorta and pulmonary arteries were recorded and compared between the two groups, and the image quality of the coronary arteries was scored subjectively.Results No significant difference was found in the aspects such as CT value, noise level, SNR, CNR radiation dosage in aorta and pulmonary arteries (P>0.05); however, the subjective scoring for coronary artery in the research group (85.5%) was significantly lower than that in the control group (93.9%) (χ2=8.33,P<0.05). Considering the influence of severe heart rate changes, we excluded those patients whose heart rate variance was more than 5 beats/min (control group:n=5; research group:n=4) and then compared the image quality of the two groups again. The subsequent results showed no difference (χ2=0.12,P>0.05). In addition, the radiation dosage in the control group was significantly higher than that in the research group [(20.8±6.2) mSvvs. (2.3±0.4) mSv;t=17.142,P<0.01].Conclusion DSCT high pitch prospective scanning in TRO protocol shows high success rate in examining patients with acute chest pain whose heart beat rate is lower than 80 beats/min and heart beat variance is less than 5 beats/min. The image quality has no difference with that derived from retrospective scan but with far more less radiation dose (2.3±0.4) mSv. This method thus is promising and can be widely promoted clinically.
