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Abstract

To implement dual-energy cone-beam computed tomography (CBCT), a 1 to 3 mm thick copper filter was
applied in front of the kilovolt generator mounted on a medical linear accelerator. The energy calibration was
performed from three energy peaks among the electromagnetic radiation, gamma rays, emitted by the 192Ir
source. The energy spectrum was measured using a cadmium zinc telluride (CZT) detector. A figure-of-merit
(FOM) value was defined and evaluated in order to consider both the increase in the mean energy and the
decrease in the intensity according to the filter. For a 1 mm thick filter, the FOM values were 0.82 and 0.92 for
tube voltages of 100 and 120 kVp, respectively. The intens ity was maintained reasonably and the effect of
increasing the mean energy was evident, thus indicating its suitability for implementing dual-energy CBCT.

치료용 선형가속기의 kV CBCT에 대한 관전압 별, 구리 필터 두께에 따른 energy spectrum 측정 실험

CZT 검출기로 측정한 Ir-192의 energy spectrum

Affiliations

Seunghyeop Baek (Department of Radiological Science, Yonsei University), Jin Sung Kim (Department of Radiation Oncology, Yonsei University College of Medicine,), Woo Sang Ahn * (Department of Radiation Oncology, Gangneung Asan Hospital, University of Ulsan College of Medicin), Sohyun Ahn * (Department of Radiation Oncology, Yonsei University College of Medicine)