| http://www.w3.org/ns/prov#value | - For the purposes of keeping the accuracy, with which the shape and location of the irradiation field are determined, high, a judgment may be made as to the characteristics of the detected prospective contour point, and the region other than the region, which corresponds to the radiation blocking material or the part outside of the concave irradiation field, may thereby be detected as the irradiati
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