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KMID : 1151820190130030371
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 3 p.371 ~ p.379
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Analysis of the ESD and DAP According to the Change of the Cine Imaging Condition of Coronary Angiography and Usefulness of SNR and CNR of the Images: Focusing on the Change of Tube Current
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Seo Young-Hyun
Song Jong-Nam
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Abstract
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The purpose of this study was to investigate the effect of the change in the X-ray condition on the entrance surface dose (ESD) and dose area product (DAP) in the cine imaging of coronary angiography (CAG), and to analyze the usefulness of the condition change on the dose relation and image quality by measuring and analyzing the Signal to Noise Radio (SNR) and Contrast to Nois Ratio (CNR) of the angiographic images taken by the Image J program. Data were collected from 33 patients (24 males and 9 females) who underwent CAG at this hospital from November 2017 to March 2018. In terms of imaging condition and data acquisition, the ESD and DAP of group A with a high tube current of 397.2 mA and group B with a low tube current of 370.7 mA were retrospectively obtained for comparison and analysis. For the SNR and CNR measurement and analysis via Image J, the result values were derived by substituting the obtained data into the formula. The correlations among ESD and DAP according to the change in the imaging condition, SNR, and CNR were analyzed by using the SPSS statistical analysis software. The relationships of groups A and B, having a difference in the imaging condition, mA, with ESD (A: 483.5±60.1; B: 464.4±39.9) and DAP (A: 84.3±10.7; B: 81.5±7) were not statistically significant (p > 0.05). In the relationships with SNR and CNR based on Image J, the SNR (5.451±0.529) and CNR (0.411±0.0432) of the images obtained via the left coronary artery (LCA) imaging of group B showed differences of 0.475±0.096 and -0.048±0.0, respectively, from the SNR (4.976±0.433) and CNR (0.459±0.0431) of the LCA of group A. However, the differences were not statistically significant (p < 0.05). In the SNR and CNR obtained via the right coronary artery (RCA) imaging, the SNR (4.731±0.773) and CNR (0.354±0.083) of group A showed increased values of 1.491±0.405 and 0.188±0.005, respectively, from the SNR (3.24±0.368) and CNR (0.166±0.033) of group B. Among these, CNR was statistically significant (p < 0.05). In the correlation analysis, statistically significant results were shown in SNR (LCA) and CNR (LCA); SNR (RCA) and CNR (RCA); ESD and DAP; ESD and sec; DAP and CNR (RCA); and DAP and sec (p < 0.05).
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KEYWORD
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Coronary Angiography, Signal to Noise Ratio, Contrast to Noise Ratio
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