| 摘要 |
PURPOSE:To easily obtain a back projection picture from back projection data and to increase the speed by adding a picture memory, the read contents and data and installing an adder, etc., inputting to the memory again. CONSTITUTION:Projection data of the first view is first given to a data memory 40 by a control processor 70. Next, an address is obtained based upon the coefficient given from the processor 70 through the picture memory 10, memory scanning circuit 20, address operation circuit 50 and clock occurrence circuit 60. By this address, the memory 10 and memory 40 are address-designated, respective contents are read and are inputted to an adder 30. The output is written in the same address as the address designated when the picture memory is read again. After the writing ends, the next clock occurs from the circuit 60, thereafter the same operation is repeated, the picture memory is wholly scanned, and the data is accumulated. For this reason, the back projection picture can be easily and speedily obtained. |
