Method and apparatus for filtering projection images

摘要

An image processing apparatus for executing reconstruction of a tomographic image from a plurality of radiation projection images by using a reconstruction filter comprises an obtaining unit that obtains the radiation projection images obtained by detecting X-rays irradiated from a plurality of positions by a digital radiation detector; a reconstructing unit that executes the reconstructing process of the tomographic image on the basis of the obtained radiation projection images and the reconstruction filter; and a processing unit that reduces an influence on a first pixel value of a pixel obtained by the reconstruction filter, that influence having been exerted by a second pixel in which a difference between a pixel value of a target pixel of a filtering process in the radiation projection image and a pixel value of a peripheral pixel of the target pixel is larger than a predetermined threshold value in the reconstructing process.

主权项

1. An image processing apparatus comprising:
an obtaining unit configured to obtain a plurality of radiation projection images from a digital radiation detector; a reconstructing unit configured to execute a filtering process on the plurality of radiation projection images using a reconstruction filter and a reconstructing process to create a tomographic image on the basis of the obtained plurality of radiation projection images; and a processing unit, including a central processing unit, configured to reduce an influence on a value of a first pixel in a radiation projection image to be supplied to the reconstruction unit, the influence being exerted by a second pixel, in a case in which a difference between the value of the first pixel and the value of the second pixel is larger than a predetermined threshold value, wherein when an absolute value of the difference between the first pixel value and the second pixel value is smaller than the threshold value, the processing unit is configured to output the difference value, and when the absolute value of the difference is larger than the threshold value, the processing unit is configured to output a value smaller than the difference value; and wherein the reconstructing unit is configured to execute the reconstructing process of the tomographic image on the basis of a value output by the processing unit.