Photon counting CT apparatus and estimated dose calculation method

摘要

In the photon counting CT apparatus, the exposure amount of the subject is accurately estimated with a simple configuration regardless of the spectrum shape of the irradiated X-ray. The exposure dose by X-rays with a predetermined intensity for each predetermined energy range is obtained in advance and held as band-unit exposure dose data. When the imaging conditions are set, the number of photons (intensity) of incident X-rays for each energy range is obtained as an X-ray spectrum that is irradiated according to the set imaging conditions and is incident on the detector without a subject. . For each energy range, the incident X-ray intensity is multiplied by the band-unit exposure data, and the result is added up for the entire energy range. Thereby, the exposure amount by irradiation X-rays irradiated according to the set imaging conditions is estimated.