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KMID : 1164220090210020089
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Journal of Korean Society for Radiotherapeutic Technology
2009 Volume.21 No. 2 p.89 ~ p.95
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Efficiency Evaluation of CT Simulator QA Phantom
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Hwang Se-Ha
Min Je-Sun
Lee Je-Hee
Park Heung-Deuk
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Abstract
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Purpose: The purpose is to evaluate efficiency of the CT simulator QA phantom manufactured for daily QA.
Materials and Methods: We made holes (1×100×1㎜) to verify accuracy between image and real measurement in polystyrene phantom and made 1 mm holes to verify table movement accuracy at superior and inferior 100 mm to the center of the phantom and inserted radiopacity material. To evaluate laser alignment, we made cross mark on the right and left side at phantom and to evaluate CT number accuracy we made 3 cylindrical holes and inserted equivalence material of bone, water, air in them. After CT scanning the phantom, We evaluated accuracy between image and real measurement, accuracy of table movement, laser, and CT number using exposed image.
Results: It was measured that the accuracy between image and real measurement was ±0.3㎜, table movement accuracy was ±0.5㎜ , laser accuracy was ±0.5㎜ from 7th January to 7th March in 2008 as within the reference point ±1 ㎜. In the CT number accuracy of bone was ±10 HU , air was ±5HU, water was ±5 HU as within the reference point is ±10 HU .
Conclusion: We was able to perform CT simulator QA and laser equipment QA more conveniently and fast using manufactured phantom at the same time. We will be able to make more accurate treatment plan that added to QA procedures using images at previous daily QA.
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KEYWORD
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CT simulator, QA, phantom
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