Patent ID: 7262426

Claim:
An image data correction method for correcting image data representing a radiograph recorded in and read from a stimulable phosphor sheet used repeatedly in radiography, the image data correction method comprising the steps of: preparing light emission change characteristic data representing a change, according to an accumulated dose of radiation on the stimulable phosphor sheet, in an amount of light emitted from the stimulable phosphor sheet having been exposed to a stimulating ray in advance; obtaining an accumulated dose of radiation in each of areas generated by dividing a light emission surface of the sheet; finding a light emission change rate representing a change in the amount of the light in each of the areas corresponding to the accumulated dose of radiation thereon, by using the light emission change characteristic data; and correcting a value of the image data for each of the areas obtained by reading thereof, by counterbalancing the change in the amount of the light included in the image data, with reference to the light emission change rate.