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KMID : 1151820180120050669
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Journal of the Korean Society of Radiology
2018 Volume.12 No. 5 p.669 ~ p.675
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Analysis of the Relationships Between ESD and DAP, and Image SNR·CNR According to the Frame Change of Cine Imaging in CAG : With Focus on 10 f/s and 15 f/s
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Jung Myo-Young
Seo Young-Hyun
Song Jong-Nam
Han Jae-Bok
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Abstract
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This study aimed to investigate the difference of X-ray exposure by comparing and analyzing entrance surface dose and absorbed dose according to the frame change in coronary angiography using an X-ray machine. Moreover, appropriate frame selection measures for examination, including the effect of frame change on the image quality, were sought by measuring and analyzing the SNR and CNR of the image through image J. The study was conducted on 30 patients (19 males and 11 females) who underwent CAG at this hospital from June 2017 to October 2017. In regard to the patients, their age range was 49-82 years (mean of 65±9 years), body weight was 45-91 kg (mean of 67±8.9 kg), height was 150-179cm (mean of 165.1±8.9 kg), and BMI was 19.5-30.5(mean of 24.5±2.9). For the entrance surface dose and absorbed dose, air kerma value and DAP were obtained and analyzed retrospectively. The SNR and CNR were measured and analyzed through imageJ, and the result values were derived by applying the values to the formula. As for the statistical analyses, the correlations between the entrance surface dose and absorbed dose, and between the SNR and CNR were analyzed by using the SPSS statistical program. The relationship between the entrance surface dose and absorbed dose was not statistically significant for both 10 f/s and 15 f/s (p>0.05). In terms of the relationship between the SNR and CNR, the SNR (3.374±2.1297) and CNR (0.234±0.2249) in 10 f/s were 1.43±0.4861 and 0.132±0.0555 lower, respectively, than the SNR (4.929±2.8532) and CNR (0.391±0.3025) in 15 f/s, which were not statistically significant (p>0.05). In the correlation analysis, statistically significant results were obtained among the BMI, air kerma, and DAP; between air kerma and DAP; and between SNR and CNR (p<0.001, p<0.001). In conclusion, there was no significant difference between the entrance surface dose and absorbed dose even when the images were taken by changing the frame from 10 f/s to 15 f/s at the time of the coronary angiography. SNR and CNR increased at 15 f/s than at 10 f/s, but they were not statistically significant. Therefore, this study suggests that the concern of the patient and practitioner regarding image quality degradation, as well as the problem of X-ray exposure caused by imaging at 10 f/s and 15 f/s, may be reduced.
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KEYWORD
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Entrance surface dose, absorbed dose, signal-to-noise ratio, contrast-to-noise ratio
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