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KMID : 1149020180200020123
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Journal of Korean Society of Computed Tomographic Technology
2018 Volume.20 No. 2 p.123 ~ p.132
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Study on the Radiation Dose of Abdominal CT Scan Using Dual Energy
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Park Dae-Hyun
Kim Yung-Kyoon
Ahn Jong-Ho
Chang Kwang-Hyun
Nam Yoon-Chul
Ahn Mi-Sub
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Abstract
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Purpose: To investigate the changes of CTDIvol, DLP and organ dose in abdominal CT using dual energy.
Material and methods: Somatom Definition Flash (Siemens Healthcare, Forchheim, Germany) was used for CT scan. The CTDIvol measurement was performed using a 32 cm PMMA phantom and Unfors Xi, and the integral dose and the organ dose were measured with a Rando phantom and a glass dosimeter. 120 kVp single energy, 80+140 kVp, 80+Sn140 kVp dual energy and 100+Sn140 kVp dual energy were used. The AEC was used for exposure factor and the pitch was 1. Linear regression analysis was performed on the measured CTDIvol displayed on the console monitor and the dose measured with the ionization chamber. Paired t-test was used to compare the average value differences in dose between groups.
Result: The linear regression analysis of the change of CTDIvol measured by the PMMA phantom and ionization chamber showed that R2 of single energy was 0.996 and R2 of dual energy was more than 0.999. The Rando phantom test results using AEC showed 284.91±2.20, 284.91±2.73, 284.91±1.60 and 284.91±1.17 mGy?cm, respectively. Highest organ dose was the dose of gonad in the eight major organs, spine has lowest organ dose. Comparison of the quality of radiation showed that 80+140 kVp was generally low. There was a statistically significant difference between the SECT and DECT groups in all groups in the lung, stomach, spine, gonad, and bladder(p< 0.05).
Conclusion: The power output performance evaluation for the change of CTDIvol was stable because R2 of SECT and DECT were close to 1. When the estimated CTDIvol is set to the same value, the difference between SECT and DECT is measured CTDIvol 3.8 mGy maximum and dose-length product 16.25 mGy maximum, organ dose was mostly high in dual energy, and difference was 0.9 mGy maximum at gonad.
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KEYWORD
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Abdominal CT, Dual energy CT, Radiation dose
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