| 摘要 |
<p>The present invention provides an imaging device, in which a plurality of gain correction images are acquired from uniform irradiation with a plurality of mutually different X-ray doses, approximation expressions (first-order expression (f(x)), polynomial expression (g(x))) of a gain correction coefficient are obtained from the acquired plurality of gain correction images, and the approximation expressions express the relationship between the input dose indicating the dose of X-rays input and the pixel values (output values) of the gain correction images. By using these approximation expressions to correct the gain of image information that is subjected to gain correction, it is possible to acquire an image having been corrected with a highly sensitive degree of correction precision across a wide input dose range outside of a specified dose. More preferably, approximation is performed by using the first-order expression (f(x)) in a low dose region, and by using the polynomial expression (g(x)) in a high dose region.</p> |
