| 摘要 |
In a method of forming an energy subtraction image, an S value (a sensitivity value) corresponding to a dose of radiation delivered in an operation for recording a radiation image is calculated from an image signal, which is obtained by reading out the radiation image. In cases where the S value is large, i.e. in cases where the dose of radiation is small, since the level of noise is high, the number of repetitions of noise reducing processes is set to be large, or the degree of a smoothing process is set to be high. In cases where the S value is small, i.e. in cases where the dose of radiation is large, since the level of noise is low, the number of repetitions of noise reducing processes is set to be small, or the degree of a smoothing process is set to be low. An energy subtraction image having good image quality is thereby obtained.
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