Patent ID: 8787520

Claim:
A radiation imaging apparatus, comprising: a radiation source for irradiating a subject with radiation; a detector having multiple pixels for detecting the radiation; a storage means for storing a scattered radiation correction function for correcting influence of scattered radiation on a detection result obtained from the detector, and a beam hardening correction function for correcting influence of beam hardening on the corrected detection result; and a correction means for correcting the detection result by the scattered radiation correction function, and for correcting the corrected detection result by the beam hardening correction function, wherein the scattered radiation correction function is calculated by using data measured with changes in a transmission distance and with changes in a scattered radiation amount, and returns a correction value of the scattered radiation amount in response to the detection result, wherein the scattered radiation correction function is obtained by approximating a relation between a first transmittance data item corresponding to a first scattered radiation amount obtained from a first function that approximates a relation between the transmittance data and the scattered radiation amount with respect to each transmission distance, and a difference value obtained by subtracting the transmittance data when the scattered radiation amount obtained from the first function is nearly zero, from the first transmittance data item, and wherein the correction means converts the detection result detected by the detector using the first scattered radiation amount, into the transmittance data, and corrects the influence of the scattered radiation by subtracting the correction value calculated from the transmittance data from the transmittance data.