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KMID : 1131320150170010101
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 1 p.101 ~ p.107
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Study of Dose Reduction Through Monitoring Start Time Change With Height In Liver 3-Phase CT Scan
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Lee Jeong-Beom
Lee Hyun-Jin
Lee Sang-Hyeon
Kim Sun-Bae
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Abstract
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Purpose : By using the bolus tracking in liver 3-phase CT scan, when things reach the desire HU value in the ROI after contrast injection, drawbacks to induce unnecessary radiation exposure was caused in monitoring scan. This study is using patient’s height that operator is it easy to see, by adjusting the first monitoring scan time, to try to reduce unnecessary exposure.
Materials and method : Divided into Group A(Control group) and Group B(experimental group) targets liver 3-phase CT scan subjected to visit Health Care Center, DLP values were examined from monitoring scan time to post contrast 150HU time, and adjust monitoring start time to fit the height, were checked for exposure dose reduction in Group B.
Result : It was able to reduce the exposure dose through monitoring start time change with height. Changes to the monitoring start time by height less than 160cm is 15sec, from 160cm and more to less than 170cm is 20sec, 170cm and more is 25sec, and it was able to reduce the exposure dose in less than 160cm is 14.0%, from 160cm and more to less than 170cm is 40.6%, 170cm and more is 56.6% compared to Group A.
Conclusion : Post contrast 150HU time is affected by height, age, weight and pulse, but it is not affected sex, systolic blood pressure and diastolic blood pressure. If the inspection to change monitoring start time in accordance with height, I think I will be able to reduce unnecessary monitoring exposure dose.
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KEYWORD
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Liver 3-phase CT, height, bolus tracking, post contrast 150HU time, monitoring start time, DLP
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