| 摘要 |
PROBLEM TO BE SOLVED: To enable photographing of a desired X-ray image in accordance with each of fluoroscopy, radiography of moving images in an area of interest and spot radiography by simplified operations, and to reduce an exposure dose to a subject. SOLUTION: A correlation table is previously input before radiographing (S1), and is memorized (S2). A radiographer sets an irradiation field R to R1 (S3), and an X-ray aperture is opened by predetermined quantity (S4). An opening value is sent to a control part (S5), and X-rays irradiate a subject P on an irradiation condition of a tube voltage (V) and tube current (A) based on the correlation table (S6). The emitted X-rays pass through the subject, enter a planar X-ray-detecting element, then are read and converted to picture signals. In addition, a method of reading picture signals through a reading circuit can be linked to information on the correlation table, and the reading circuit is controlled so as to add picture signals, for instance, of 4 by 4 (= 16) pixels which are adjacent to each other into a picture signal of 1 pixel and read it (S7). COPYRIGHT: (C)2005,JPO&NCIPI
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