KMID : 1033420190220010046
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Journal of Korean Society of Cardio-Vascular Interventional Technology 2019 Volume.22 No. 1 p.46 ~ p.57
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The Comparison of Radiation Dose and Image Evaluation between Manual and Intelligent Measure Field
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Shim Jae-Min
Yang Min-Jae Jeong Tae-Seob Song Chang-Uk Bang Yong-Sik
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Abstract
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Purpose : To assess and compare the radiation dose and image evaluation between Manual and Intelligent Measure Field during PCNA(Percutaneous Needle Aspiration : PCNA).
Materials and Methods : LUNGMAN Phantom(Chest Phantom K1, KYOTO KAGAKU, Japan) was sccaned with Dyna CT(AXIOM-Artis zee ceiling, Siemens, Germany) with each of Manual and Intelligent Measure Field, 30 times respectively. Analyzed significance test at 95% of confidence level to assess and compare about Contrast, SNR(Signal to Ratio), CNR(Contrast to Ratio), DAP(Dose Area Product) by using independent t-test analysis. 3 radiologists blinded to the both of Measure Fields independently scored subjective image quality on 5-point Likert scale and measured image noise.
Result : DAP for Dyna CT from Manual and Intelligent Measure Field were 566.97¡¾7.98¥ìGy?m2 and 748.24¡¾3.44¥ìGy?m2 ; statistically significant difference(p<0.05) was shown. Contrast were ?877.80¡¾5.50 and ?886.86¡¾4.47 ; statistically significant difference(p<0.05) was shown. SNR were ?8.83¡¾0.32 and ?9.22¡¾0.49 ; statistically significant difference(p<0.05) was shown. CNR were ?14.38¡¾0.41 and ?15.07¡¾0.62 ; statistically significant difference(p<0.05) was shown. Blinded scores were mean 2.2 ; Overall percent agreement for pairwise ratings was ¡Ã81% for all conditions(p<0.05).
Conclusion : The phantom study indicates that not only Manual Measure Field applies significantly less dose and higher Contrast, SNR, CNR to the patient but also achieves similar image quality.
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KEYWORD
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PCNA, DAP, Contrast, SNR, CNR
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