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KMID : 0357520150380030245
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Journal of Radiological Science and Technology
2015 Volume.38 No. 3 p.245 ~ p.252
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A Comparative Study of CTDI and the Effective Dose and the SNR according to the Area in the Abdominal CT
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Choi Sung-Jun
Kang Jun-Guk
Kim Su-In
Kim Youn-Ho
Lee Do-Gyeong
Jung Jin-Gyung
Cho Ar-A
Jang Jae-Hyeok
Kweon Dae-Cheol
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Abstract
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To obtain the best SNR (signal to noise ratio) due to changes in CTDI (computed tomography dose index) made for the purpose of setting the optimum image obtained by reducing the dose in abdominal CT. Abdominal CT scans of 59 patients a 400-499 cm2 (n = 12), 500-599 cm2 (n = 21), 600-699 cm2 (n = 17), 700-799 cm2 (n = 9) were separated by four groups and the effective dose was used in the Excel to get the area of the patient using the ImageJ program. Patients of CTDI, DLP, SNR, the effective dose were analyzed. Abdominal CT area was increased to 13 mGy in CTDI is 7.3 mGy, DLP to 732 in 394.4 mGy?cm, also effective dose was 5.9 mSv increase in 11mSv. SNR is 15 dB was maintained at 12.7. CTDI according to the average of the abdominal area of 8.9 mGy, the average of the DLP was 481.5 mGy?cm, the effective dose is calculated to be 7.2 mSV. Effective dose was calculated by multiplying the load factor of DLP in the abdomen showed no statistically significant difference of (p < .05), there was a significant difference in SNR (p > . 05). To improve image quality of abdominal CT scan image in consideration of the CTDI according to the volume of the patient it should be able to reduce the radiation exposure of the patients.
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KEYWORD
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Abdomen, CT, CTDI, Effective Dose, SNR
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