2020
DOI: 10.4283/jmag.2020.25.4.614
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Energy Spectrum of Electromagnetic Radiation for a Dual-Energy Cone-Beam Computed Tomography in Radiotherapy

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 192 Ir 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 energ… Show more

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