| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the irradiation field for X-rays. SOLUTION: This dosage measuring device 1 is constituted of a density data converting means 62, an information processing means 63 and a display means 72. The density data converting means 62 scans a film 35 for measurement, which is irradiated with rays, and converts the radiation field image to density data. The information processing means 63 processes two-dimensional information and three-dimensional information based on the density information. The display means 72 displays a density image based on the processed density information. The film for measurement is irradiated with the rays, and variable density information (radiation field variable density image) is obtained. Then, the variable density information is converted into density data, and the radiation field and the flatness are projected on the display means and measured. Since the radiation field is obtained from the density data, the size and the shape of the radiation field can be accurately measured. The flatness can be easily calculated as well. By this constitution, the adjustment of the radiation field or a replacement timing for a target which is built in the radiation device can be accurately grasped.
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