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KMID : 1149020180200010023
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 1 p.23 ~ p.32
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Investigating Decrease in Radiation Dose using Acute Chest Pain Coronary CT with 128 slice MDCT Scanner
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Kim Yong-Seob
Park Cheon-Woong
Kim Eun-Jeong
Lee Sook-Hee
Im Heung-Sun
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Abstract
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Purpose: In this study, an area of examination is divided into helical scan mode and retrospective ECG gated helical scan mode in order to decrease radiation dose. The practicality of this new approach is further evaluated by investigating radiation dose and its image quality.
Methods: A total of 120 outpatients who visited the hospital for Acute Chest pain from June 2016 to January 2017 were examined using a cross-sectional design. 60 patients in the control group were scanned with retrospective ECG gated helical mode, and other 60 patients in the experimental group were scanned with both helical mode and retrospective ECG gated helical mode. While an area of the examination was selected from lung apex to CPA for the control group, an area of examination for the experimental group was divided into two sections: from CPA to carina trachea using retrospective ECG-gated helical scan mode, and from carina trachea to lung apex using helical scan mode.
Result: 1. Quantitative Analysis: On average, the control group was exposed to 1670.6 mGy of radiation, and the experimental group was exposed to 1035.4 mGy of radiation. Which means the experimental group was less exposed to radiation by 38.06% compared to the control group, and the data were statistically significant (p <0.05). 2. Qualitative Analysis: When an area of examination is divided into helical scan mode and retrospective ECG gated helical scan mode, the overall quality of Acute Chest pain CT examination is increased by 4.68 within 5 grade scoring system.
Conclusions: According to the qualitative analysis, the average radiation dose is reduced by 38.06% using the newly suggested method in this study. By dividing the sections of an examined area, the overall image quality and DLP are enhanced at the same time. Therefore, if this method becomes applicable with other examinations as well, it will minimize the patients' unnecessary radiation exposure and further decrease some potential risks of the examination.
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KEYWORD
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CCTA, Acute chest pain, Dose reduction, DLP[mGy*cm]
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