| PAN Yu-ning,HUANG Qiu-li,REN Da-wei,et al.Application value of low radiation dose coronary angiography using 320-slice volume CT[J].Chinese Journal of Radiological Medicine and Protection,2012,32(4):420-424,435 |
| Application value of low radiation dose coronary angiography using 320-slice volume CT |
| Received:December 19, 2011 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.04.025 |
| KeyWords:320-slice volume CT Coronary angiography Noise Radiation dose |
| FundProject:宁波市社会发展科研项目(2011C50075) |
| Author Name | Affiliation | E-mail | | PAN Yu-ning | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | | | HUANG Qiu-li | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | huang_qiuli@126.com | | REN Da-wei | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | | | WU An-le | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | | | YE Xian-wang | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | | | ZHANG Jie | Department of Radiology, Ningbo First Hospital, Ningbo 315010, China | | | CHEN Xiao-min | 315010 宁波市第一医院心内科 | | | WANG Jian | 315010 宁波市第一医院心内科 | |
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| Abstract:: |
| Objective To evaluate the image quality and radiation dose of prospective electrocardiography-triggered coronary 320-slice volume CT angiography with different kV, and the feasibility of coronary scan with <1 mSv radiation dose.Methods Eighty consecutive patients were randomly divided into two groups equally.The tube voltage according to paradigm was 100 kV in group A and 120 kV in group B. All raw data in group A was reconstructed by the software AIDR in CT system to create a new group named as A1. Such parameters as the mean intraluminal attenuation (SI), noise (SD), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR),effective radiation dose(E) and image quality score measured in group A were compared with those in group B. The values such as SI, SD, SNR, CNR, image quality scores were compared between group A and group A1. The significance of group B and group A1 was compared in SI, SD, SNR, CNR, image quality scores as well. Results E in group A was significantly lower than that in group B[E=(0.67 ± 0.18) mSv in group A vs. E=(3.08 ± 1.04) mSv in group B]. The value of E in group A was decreased by 78% compared to group B(t=-14.30, P<0.05). There was no significant difference in mean image quality scores between two groups(4.57 ± 0.57 in group A vs. 4.59 ± 0.59 in group B, t=-1.17, P>0.05). The values of SI, SD, SNR, CNR in group A were (570.8±131.5)HU, 25.1±6.9, 24.5±9.1, 19.8±6.1. And the values of SI, SD, SNR, CNR in group B were (460.6 ± 14.3) HU, 15.1±3.6, 31.7±7.7, 29.3±6.8. The values of SI and SD in group A were significantly higher than those in group B(t=4.49,8.18, P<0.05). The values of SNR and CNR in group A were lower than those in group B (t=-4.24,-6.19, P<0.05). The values of SI,SD, SNR, CNR,image quality scores in group A1 were (557.9±24.5) HU, 21.1±6.0, 27.7±10.0, 23.4±7.8, 4.60 ± 0.56. There was no difference in the SI and the image quality scores between group A and group A1 (t=1.09,-1.90, P>0.05). Conclusions 320-slice volume CT with 100 kV tube voltage and prospective ECG-triggered technique can reduce the radiation dose to less than 1 mSv and obtain optimal images in diagnosis of coronary arterial diseases. |
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