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KMID : 1151820200140040375
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 4 p.375 ~ p.3830
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Study on Usefulness of Entrance Surface Dose (ESD), Entropy Analysis Method to Evaluate Ionization Chamber Performance and Implementation of Optimal Chamber Combination Model when using Automatic Exposure Control (AEC) Device in Digital Radiography (DR)
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Hwang Jun-Ho
Choi Ji-An
Lee Kyung-Bae
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Abstract
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This study aimed to propose a methodology for quantitatively analyzing problems resulting from the performance and combination of the ionization chamber when using an automatic exposure control (AEC) and to optimize the performance of the digital radiography (DR). In the experimental method, the X-ray quality of the parameters used for the examination of the abdomen and pelvis was evaluated by percentage average error (PAE) and half value layer (HVL). Then, the stability of the radiation output and the image quality were analyzed by calculating the entrance surface dose (ESD) and entropy when the three ionization chambers were combined. As a result, all of the X-ray quality of the digital radiography used in the experiment showed a percentage average error and a half value layer in the normal range. The entrance surface dose increased in proportion to the combination of chambers, and entropy increased in proportion to the combination of ionization chambers except when three chambers were combined. In conclusion, analysis using entrance surface dose and entropy was found to be a useful method for evaluating the performance and combination problems of the ionization chamber, and the optimal performance of the digital radiography can be maintained when two or less ionization chambers are combined.
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KEYWORD
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Digital radiography (DR) , Automatic exposure control (AEC) , Ionization chamber , Entrance surface dose (ESD) , Entropy
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