| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of the quality of a radiological image obtained from an accumulative fluorescent sheet used repeatedly for radiography in an image data compensator. SOLUTION: A luminous characteristic storage means 10 stores data on a characteristic of a change in emitted light quantity, and a split region storage means 15 stores the position and the range of each split region formed by splitting the luminous surface of the accumulative fluorescent sheet. An accumulated exposure acquisition means 20 acquires accumulated radiation exposure in each of the split regions, and an emitted light quantity change rate acquisition means 25 finds a rate of a change in the quantity of emitted light which represents a change in the emitted light quantity of accelerated phosphorescence luminescence, according to accumulated radiation exposure in each split region by the use of the data on the characteristic of the change in the emitted light quantity. By using the rate of the change in the luminous light quantity in each split region, a compensation means 30 compensates a variation component of a value of the image data caused by the change in the emitted light quantity of the accelerated phosphorescence luminescence which image data obtained by reading each split region have, with respect to each split region. COPYRIGHT: (C)2006,JPO&NCIPI
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