Dual-energy 컴퓨터단층촬영에서 장비 제공선량과 측정선량 비교

Comparison of Estimated and Measured Doses of Dual-energy Computed Tomography

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 CTDI vol value was measured by inserting the Unfors Xi ion chamber into a 32 cm PMMA acryl Phantom. The results of estimated CTDI vol DECT and measured CTDI vol showed that the dose difference between DECT 80 + 140kVp of G company was at least 0.51% and -1.90% max, and measured CTDI vol 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 CTDI vol was less than estimated CTDI vol . 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 CTDI vol was less. The linearity of exposure dose for all DECT equipment was very linearly reflected with R 2 being 0.97 or above, and the measured dose of the ionization chamber was less than the predicted dose of the monitor.