CTDI 팬텀을 이용한 CT 검사에서Bolus Tracking Technique의 선량 평가
Analysis of Radiation Dose for the Bolus Tracking Technique using the CTDI Phantom of CT Study
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The purpose of this study is to measure the dose using head and body CTDI phantom,and the bolus tracking technique according to monitoring for CT study. CT-dose-index (CTDI)phantoms of the head and body were used to measure dose in CT using the bolus trackingtechnique. Scout scans were applied with a tube voltage of 120 kVp and a tube current of 30 mAsin the head and CTDI body phantom. Bolus tracking technique scanning was performed at 20mAs for monitoring and 0.5 sec, B30f (medium smooth) kernel and 2.0 mm thickness. For dosemeasurement, the dose including scout monitoring was measured five times using an ionizationchamber (UNFORS Xi, Raysafe AB, Billda, Sweden) dosimeter in the center of the head and bodyphantom. The effective dose was 0.018 mSv for the head phantom multiplied by k (conversioncoefficients) by DLP and 0.066 mSv for the body phantom. Even if the radiation dose frommonitoring is low, it can be applied as a basic data effectively to reduce the dose from monitoringin the clinical trial for patients.
Abstract
The purpose of this study is to measure the dose using head and body CTDI phantom,and the bolus tracking technique according to monitoring for CT study. CT-dose-index (CTDI)phantoms of the head and body were used to measure dose in CT using the bolus trackingtechnique. Scout scans were applied with a tube voltage of 120 kVp and a tube current of 30 mAsin the head and CTDI body phantom. Bolus tracking technique scanning was performed at 20mAs for monitoring and 0.5 sec, B30f (medium smooth) kernel and 2.0 mm thickness. For dosemeasurement, the dose including scout monitoring was measured five times using an ionizationchamber (UNFORS Xi, Raysafe AB, Billda, Sweden) dosimeter in the center of the head and bodyphantom. The effective dose was 0.018 mSv for the head phantom multiplied by k (conversioncoefficients) by DLP and 0.066 mSv for the body phantom. Even if the radiation dose frommonitoring is low, it can be applied as a basic data effectively to reduce the dose from monitoringin the clinical trial for patients.
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