| 摘要 |
PROBLEM TO BE SOLVED: To remove a streak artifact by means of an object with a high radiation absorption rate by correcting the high frequency component of a projection at a specified corresponding position on the projection of several views concerning the image of the high radiation absorbing object of a tomographic image which is re-constituted from the projection. SOLUTION: When the projection PRj1 in the view j1 is the one in a figure, for example, and a sinogram SN, that is the projection of the object is positioned at Pi on an i-axis, correction is executed concerning a prescribed range (d) including the position Pi. A corresponding position is correctly specified concerning the position Pi by utilizing the sinogram. At the time of correction, signals are made to be the ones only with the high frequency component by processing the projection PRj1 by a proper high-pass filter, a signal strength in each high frequency component belonging to the range (d) among them is obtained and subtraction is executed in the strengths which correspond in position in the projection PRi1. Thus, the high frequency components of the range (d) are cancelled. |
