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KMID : 0357520160390010001
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Journal of Radiological Science and Technology
2016 Volume.39 No. 1 p.1 ~ p.11
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Evaluation on Organ Dose and Image Quality of Lumbar Spine Radiography Using Glass Dosimeter
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Kim Jae-Kyeom
Kim Jeong-Koo
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Abstract
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The purpose of this study was to provide resources for medical exposure reduction through evaluation of organ dose and image resolution for lumbar spine around according to the size of the collimator in DR system.
The size of the collimator were varied from 8″×17″ to 14″×17″ by 1″ in AP and lateral projection for the lumbar spine radiography with RANDO phantom. The organ dose measured for liver, stomach, pancreas, kidney and gonad by the glass dosimeter. The image resolution was analyzed using the Image J program. The organ dose of around lumbar spine were reduced as the size of the collimator is decreased in AP projection. There were no significant changes decreasing rate whenever the size of the collimator were reduced 1″ in the gonad. The organ dose showed higher on liver and kidney near the surface in lateral projection. There were decreasing rate of less than 5% in liver and kidney, but decreasing rate was 24.34% in the gonad whenever the size of the collimator were reduced 1″. Organ dose difference for internal and external of collimator measured 549.8 μ㏉ in the liver and 264.6 μ㏉ in the stomach. There were no significant changes organ dose difference that measured 1,135.1 μ㏉ in the gonad. Image Quality made no difference because SNR and PSNR were over than 30 dB when the collimator size is less than 9″×17″ on AP projection and 10″×17″ on lateral projection.
Therefore, we are considered that the recommendations criterion for control of collimator were suggested in order to reduce unnecessary X-ray exposure and to obtain good image quality because lumbar spine radiography contains a lot of peripheral organs rather than other area radiography.
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KEYWORD
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Organ dose, Image Quality, Lumbar spine radiography, Glass Dosimeter
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