Phase contrast x-ray imaging system and image processing method
AssigneeShimadzu Corporation
InventorTakahiro Doki
Life of this patent
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Abstract
A phase contrast X-ray imaging system includes an X-ray source, a plurality of gratings, a detector for detecting X-rays, a grating movement mechanism, and a controller. The controller generates a phase contrast image based on intensity changes that represent changes in pixel values of pixels detected by the detector while moving a scanning grating, which is at least one of the plurality of gratings, using the grating movement mechanism. The controller acquires an analysis period representing a period of the intensity change to reduce a moire artifact, and adjusts a set value of movement of the scanning grating for generating the phase contrast image based on the analysis period acquired.
Claims11
A phase contrast X-ray imaging system comprising:
- an X-ray source;
- a plurality of gratings including a first grating for forming a self-image by irradiation with X-rays from the X-ray source, and a second grating for interfering with the self-image of the first grating;
- a detector for detecting the X-rays for irradiation from the X-ray source;
- a grating movement mechanism for moving at least one of the plurality of gratings;
- and
- a controller for generating a phase contrast image based on intensity changes that represent changes in pixel values of pixels detected by the detector while moving a scanning grating, which is the at least one of the plurality of gratings, using the grating movement mechanism, wherein
- the controller is configured
- to acquire an analysis period that represents a period of the intensity change to reduce a moire artifact as a noise component included in the phase contrast image, and
- to adjust a set value of movement of the scanning grating for generating the phase contrast image based on the analysis period acquired.
An image processing method comprising:
- detecting X-rays for irradiation from an X-ray source that passes through a plurality of gratings while moving a scanning grating, which is at least one of the plurality of gratings including a first grating for forming a self-image by irradiation with X-rays from the X-ray source and a second grating for interfering with the self-image of the first grating;
- generating a phase contrast image based on intensity changes that represent changes in pixel values of pixels detected;
- acquiring an analysis period that represents a period of each intensity change to reduce a moire artifact as a noise component in the phase contrast image generated;
- and
- adjusting a set value of movement of the scanning grating for generating the phase contrast image based on the analysis period acquired.
Dependencies are inferred from the claim text.