Patent ID: 7599541
Filing Date: 2009-10-06
Classification: H04N

Abstract:
1. A radiographic apparatus for executing radiography, comprising: a setting unit that sets one of a reference image radiography mode and a radiographic image radiography mode; a first acquisition unit that acquires a first FPN image as a reference by causing a sensor having an amplifier IC to detect a radiation ray within a dose range with linearity, when the reference image radiography mode is set; a second acquisition unit that acquires a second FPN image by causing the sensor to detect a radiation ray which is irradiated on the basis of a radiography condition being set for the purpose of radiographing an object, when the radiographic image radiography mode is set; a first division unit that divides the first FPN image into respective first rectangles, each of which has a size corresponding to the amplifier IC; a second division unit that divides the second FPN image into respective second rectangles, each of which has the size; a first calculation unit that calculates statistical amount of pixels included in the first rectangle, for each of the first rectangles; a second calculation unit that calculates second statistical amount of pixels included in the second rectangle, for each of the second rectangles; a third calculation unit that calculates variation amounts between the first statistical amounts and the second statistical amounts; and a determination unit that determines that an afterimage is present on the first and second FPN images, when at least one of the variation amounts is larger than a predetermined amount.