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KMID : 0357520180410050405
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Journal of Radiological Science and Technology
2018 Volume.41 No. 5 p.405 ~ p.411
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Comparison of Estimated and Measured Doses of Dual-energy Computed Tomography
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Kim Yung-Kyoon
Kim Yon-Min
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Abstract
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We will provide basic data on the evaluation of patient dose in terms of DECT quality control by comparing the equipment-provided dose with the measured dose according to the configuration method of the X-ray generator by the manufacturer of the dual-energy CT unit. For computed tomography (CT) equipment, Discovery 750HD, Aquilion ONE GENESIS Edition, and Somatom Definition Flash were used. The CTDIvol value was measured by inserting the Unfors Xi ion chamber into a 32 cm PMMA acryl Phantom. The results of estimated CTDIvol DECT and measured CTDIvol showed that the dose difference between DECT 80 + 140 kVp of G company was at least 0.51% and -1.90% max, and measured CTDIvol was slightly lower (p<0.05). The difference of 80 + 140 kVp of S company was the minimum of 5.84% and the maximum of 7.52% (p<0.05). The measured CTDIvol was less than estimated CTDIvol. The C company’s 80 + 135 kVp showed a difference of at least 7.58% and a maximum of 13.58% (P<0.05), and all of measured CTDIvol was less. The linearity of exposure dose for all DECT equipment was very linearly reflected with R2 being 0.97 or above, and the measured dose of the ionization chamber was less than the predicted dose of the monitor.
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KEYWORD
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Dual energy CT, CTDIvol, Estimated Radiation dose, Measurement Radiation dose, Quality assueance
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