Investigation of Image Quality and Radiation Dose for Whole-Spine Examination in Pediatrics: Phantom Study
碩士 === 長庚大學 === 醫學影像暨放射科學系 === 104 === This study was aimed to compare the radiation dose of whole-spine examination for pediatrics between CR and DR system, to evaluate the feasibility of using bismuth shielding to protect sensitive superficial organs such as breast tissue, and to optimize the imag...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2016
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| Online Access: | http://ndltd.ncl.edu.tw/handle/jbrt7a |
| Summary: | 碩士 === 長庚大學 === 醫學影像暨放射科學系 === 104 === This study was aimed to compare the radiation dose of whole-spine examination for pediatrics between CR and DR system, to evaluate the feasibility of using bismuth shielding to protect sensitive superficial organs such as breast tissue, and to optimize the imaging protocol to reduce the dose.
Dose evaluation were done for Anterior-to-posterior (AP) and lateral (LAT) projection. The image acquisitions were performed on one CR system and one DR system. Dose were measured with thermoluminescent dosimeter (TLD) chips inserted within a 10 year-old anthropomorphic phantom. The organ doses and the effective doses were thus calculated and compared with Monte Carlo simulation program investigation. The breast area was covered by bismuth shielding. The figure of merit of the images was the index used to determine the optimal imaging protocol.
For a scoliosis examination, the effective doses ranged from 0.23 to 0.47 mSv of DR systems, and from 0.21 to 0.24 mSv of the CR system, respectively. Effective dose of AP projection is slightly higher than those of LAT projection. The maximum organ dose was observed in the breast. The breast organ dose with bismuth shielding could be lower 30% than those without bismuth shielding at least. The optimization imaging protocol could decrease the effective dose about 50% than the currently clinical imaging protocol.
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