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KMID : 0357520200430050343
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Journal of Radiological Science and Technology
2020 Volume.43 No. 5 p.343 ~ p.351
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Lens Dose Reduction Methods and Image Quality in Orbital Computed Tomography Scan
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Moon Se-Young
Hong Sang-Woo
Seo Ji-Sook
Kim Yeong-Beom
Kwak Wan-Sin
Lee Seong-Yeong
Kim Jung-Soo
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Abstract
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This study analyzed dose reduction and quality of images through dose reduction tools and shielding board to protect sensitive eye lens in radiation during orbit CT examinations for clinical data use. During CT scans of the phantom, surface dose (CT scanner dosimetry phantom, ion chamber-3 times) and quality of image (radiosurgery head phantom, visual assessment-2 times, HU standard deviation) were evaluated using X-care which is dose reduction tools and bismuth shielding board. The results of experiments of eight conditions showed a relatively reduced dose in all other conditions compared to when no conditions were set. In particular, the area corresponding to the ophthalmic part reduced the surface dose by up to 45.7 %. The visual evaluation of images by specialists and the quality evaluation of images analyzed by HU standard deviation were clinically closest to the use of X-care and shielding board (1 cm in height). Therefore, it is believed that the use of shielding board in a suitable location with dose reduction tools while investigating the optimal radiation dose will reduce the exposure dose of sensitive lens at radiation while maintaining the quality of the images with high diagnostic value.
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KEYWORD
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Lens dose, X-CARE mode, Bismuth shield, Dose reduction, Image quality
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