The aim o this article is to discuss the protocol o betablockers that is commonly used or prospectively ECGtriggered coronary computed tomography angiography(CCTA).It is essential to ensure a low and regular heart rat...The aim o this article is to discuss the protocol o betablockers that is commonly used or prospectively ECGtriggered coronary computed tomography angiography(CCTA).It is essential to ensure a low and regular heart rate in patients undergoing prospectively ECG-triggered CCTA or optimal visualization o coronary arteries.Although early generations o computed tomographyscanners are not applicable to be tailored according to patients’heart rate,a low and regular heart rate is possible to be achieved by the administration o medications according to the beta-blocker protocol.Betablocker can be sa ely administered to reduce patients’heart rate or CCTA examination i patients are screened or certain contraindications.展开更多
Objective To assess the image quality and effective radiation dose of prospectively electrocardiogram-triggered high-pitch spiral acquisition (flash spiral mode)dual-source CT coronary angiography in patients with hig...Objective To assess the image quality and effective radiation dose of prospectively electrocardiogram-triggered high-pitch spiral acquisition (flash spiral mode)dual-source CT coronary angiography in patients with high heart rate(HR).Methods From 1321 consecutive patients,seventy patients with HR≥70 bpm (group A) and seventy patients with HR<70 bpm (group B) underwent CT angiography and were prospectively included in this study.The start phase for image acquisition of the most cranial slice was selected at 20%-30% of the R-R interval for group A and at 60% of the RR interval for group B.Assessed the image quality and effective radiation dose of two group.Results (1)There were no significant differences in age,sex,BMI and scan time between the two groups.(2)Image qualities:The segments with non-diagnostic image quality occurred (i.e.score 3) had no significant difference between group A and group B (2.1% vs.1.5%,P=0.48).Non-diagnostic image quality was most often found in the RCA and LCX in both groups.(3)The estimated radiation dose was on average (1.00±0.15) mSv(0.7-1.82 mSv) in group A and (1.01±0.16)mSv (0.65-1.82 mSv) in group B.Conclusions Patients with high heart rates can be performed CTCA with high-pitch spiral acquisition mode.20%-30% of the R-R interval window for data acquisition for high-pitch dual-source CTCA may probably obtain good image quality with low doses.The highest HRs are 100 bpm with good image quality.HR variability is a great effect factor of image quality.The estimated radiation dose is about 1 mSv.展开更多
Background：Accurate assessment of intra-as well as extra-cardiac malformations and radiation dosage concerns are especially crucial to infants and children with interrupted aortic arch （IAA）.The purpose of this stu...Background：Accurate assessment of intra-as well as extra-cardiac malformations and radiation dosage concerns are especially crucial to infants and children with interrupted aortic arch （IAA）.The purpose of this study is to investigate the value of prospective electrocardiogram （ECG）-triggered dual-source computed tomography （DSCT） angiography with low-dosage techniques in the diagnosis of IAA.Methods：Thirteen patients with suspected IAA underwent prospective ECG-triggered DSCT scan and transthoracic echocardiography （TTE）.Surgery was performed on all the patients.A five-point scale was used to assess image quality.The diagnostic accuracy ofDSCT angiography and TTE was compared with the surgical findings as the reference standard.A nonparametric Chi-square test was used for comparative analysis.P＜0.05 was considered as a significant difference.The mean effective radiation dose （ED） was calculated.Results：Diagnostic DSCT images were obtained for all the patients.Thirteen IAA cases with 60 separate cardiovascular anomalies were confirmed by surgical findings.The diagnostic accuracy of TTE and DSCT for total cardiovascular malformations was 93.7％ and 97.9％ （P＞0.05）,and that for extra-cardiac vascular malformations was 92.3％ and 99.0％ （P ＜ 0.05）,respectively.The mean score of image quality was 3.77 ± 0.83.The mean ED was 0.30 ± 0.04 mSv （range from 0.23 mSv to 0.39 mSv）.Conclusions：In infants and children with IAA,prospective ECG-triggered DSCT with low radiation exposure and high diagnostic efficiency has higher accuracy compared to TTE in detection of extra-cardiac vascular anomalies.展开更多
文摘The aim o this article is to discuss the protocol o betablockers that is commonly used or prospectively ECGtriggered coronary computed tomography angiography(CCTA).It is essential to ensure a low and regular heart rate in patients undergoing prospectively ECG-triggered CCTA or optimal visualization o coronary arteries.Although early generations o computed tomographyscanners are not applicable to be tailored according to patients’heart rate,a low and regular heart rate is possible to be achieved by the administration o medications according to the beta-blocker protocol.Betablocker can be sa ely administered to reduce patients’heart rate or CCTA examination i patients are screened or certain contraindications.
基金grants from the Natural Science Foundation of Inner Mongolia (20110054)
文摘Objective To assess the image quality and effective radiation dose of prospectively electrocardiogram-triggered high-pitch spiral acquisition (flash spiral mode)dual-source CT coronary angiography in patients with high heart rate(HR).Methods From 1321 consecutive patients,seventy patients with HR≥70 bpm (group A) and seventy patients with HR<70 bpm (group B) underwent CT angiography and were prospectively included in this study.The start phase for image acquisition of the most cranial slice was selected at 20%-30% of the R-R interval for group A and at 60% of the RR interval for group B.Assessed the image quality and effective radiation dose of two group.Results (1)There were no significant differences in age,sex,BMI and scan time between the two groups.(2)Image qualities:The segments with non-diagnostic image quality occurred (i.e.score 3) had no significant difference between group A and group B (2.1% vs.1.5%,P=0.48).Non-diagnostic image quality was most often found in the RCA and LCX in both groups.(3)The estimated radiation dose was on average (1.00±0.15) mSv(0.7-1.82 mSv) in group A and (1.01±0.16)mSv (0.65-1.82 mSv) in group B.Conclusions Patients with high heart rates can be performed CTCA with high-pitch spiral acquisition mode.20%-30% of the R-R interval window for data acquisition for high-pitch dual-source CTCA may probably obtain good image quality with low doses.The highest HRs are 100 bpm with good image quality.HR variability is a great effect factor of image quality.The estimated radiation dose is about 1 mSv.
文摘Background：Accurate assessment of intra-as well as extra-cardiac malformations and radiation dosage concerns are especially crucial to infants and children with interrupted aortic arch （IAA）.The purpose of this study is to investigate the value of prospective electrocardiogram （ECG）-triggered dual-source computed tomography （DSCT） angiography with low-dosage techniques in the diagnosis of IAA.Methods：Thirteen patients with suspected IAA underwent prospective ECG-triggered DSCT scan and transthoracic echocardiography （TTE）.Surgery was performed on all the patients.A five-point scale was used to assess image quality.The diagnostic accuracy ofDSCT angiography and TTE was compared with the surgical findings as the reference standard.A nonparametric Chi-square test was used for comparative analysis.P＜0.05 was considered as a significant difference.The mean effective radiation dose （ED） was calculated.Results：Diagnostic DSCT images were obtained for all the patients.Thirteen IAA cases with 60 separate cardiovascular anomalies were confirmed by surgical findings.The diagnostic accuracy of TTE and DSCT for total cardiovascular malformations was 93.7％ and 97.9％ （P＞0.05）,and that for extra-cardiac vascular malformations was 92.3％ and 99.0％ （P ＜ 0.05）,respectively.The mean score of image quality was 3.77 ± 0.83.The mean ED was 0.30 ± 0.04 mSv （range from 0.23 mSv to 0.39 mSv）.Conclusions：In infants and children with IAA,prospective ECG-triggered DSCT with low radiation exposure and high diagnostic efficiency has higher accuracy compared to TTE in detection of extra-cardiac vascular anomalies.
