| 摘要 |
PURPOSE: To eliminate adverse effects during layer exposure without intervening an X-ray generator by multiplying a weighting factor depending on a radiation source position at the time of generating a relating single image to an image value and adding it to a tomographic image point. CONSTITUTION: An arithmetic and control unit 80 decides an address inside a memory 7 where the image value Bn (x+io n, y) of the tomographic image point provided with a coordinate value x, y in a layer (i) is stored. The image value is taken out from the memory 7 and supplied to a multiplication stage 81 and the weighting factor gj (n) taken out from the memory 82 is multiplied. Then, the value stored in the x, y address of the tomopgraphic image is taken out and added to the value calculated in the multiplication stage 81 by using an addition unit 84 and the total value is stored in the address of the memory 83 called in advance. Thereafter, after the processing is repeated to all the single images, the tomographic image value Si (x, y) is supplied to the memory 83 and a layer image is calculated and displayed on a monitor 9. |
