| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, the smaller a tube current and an imaging time are, the larger deviation from an actual measurement value is, because a quantity of radiation is calculated using a calculating formula assuming that the quantity of radiation is proportional to the tube current and imaging time in an X-ray high voltage device having capability to calculate the quantity of radiation on the basis of an imaging condition. SOLUTION: As a calculating formula, a dosage characteristic constant DT (V) of a term corresponding to the quantity of radiation of an X-ray irradiated as a wave tail X-ray is added to an existing term in proportion to a tube current and an imaging time, and the DT (V) and the dosage characteristic coefficient Dt (V) of the term in proportion to the tube current and the imaging time is beforehand stored in a DT (V) memory 14 and a Dt (V) memory 15, respectively. Then, a computational part 16 calculates the quantity of radiation from the calculating formula using the imaging condition obtained from an X-ray controller 3 at the setup time of the imaging condition and memory values stored in both the memories. COPYRIGHT: (C)2008,JPO&INPIT
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