X-ray diagnostic apparatus
AssigneeKabushiki Kaisha Toshiba
InventorYasunori Goto
Life of this patent
Estimating the term…
Abstract
An X-ray tube and an X-ray detector are supported by an arm in such a manner that a distance between the X-ray tube and an image reception plane of the X-ray detector can be changed. A grid is arranged on the image reception plane of the X-ray detector. The arm is supported by an arm support apparatus in such a manner that an angle of the arm can be changed. Moire image data files obtained by the grid are stored in a storage device in association with the distance between the X-ray tube and the image reception plane of the X-ray detector and the angle of the arm. Image data outputted from the X-ray detector is corrected by the moire correction circuit based on the moire image data selectively read from the storage device in accordance with the distance and the angle.
Claims24
An X-ray diagnostic apparatus comprising:
- an X-ray tube;
- an X-ray detector;
- a grid arranged on an image reception plane of said X-ray detector;
- an arm configured to support said X-ray tube and said X-ray detector in such a manner that a distance between said X-ray tube and said image reception plane of said X-ray detector can be changed;
- an arm support device configured to support said arm in such a manner that an angle of said arm can be changed;
- a storage device configured to store moire image data files including moire fringes by said grid in association with at least one of said distance and said angle;
- and
- a moire correction circuit configured to correct image data outputted from said X-ray detector based on moire image data file selectively read from said storage device in accordance with at least one of said distance and said angle.
An X-ray diagnostic apparatus comprising:
- an X-ray tube;
- an X-ray detector;
- a gird arranged on an image reception plane of said X-ray detector;
- an arm configured to support said X-ray tube and said X-ray detector in such a manner that a distance between said X-ray tube and said image reception plane of said X-ray detector can be changed;
- an arm support device configured to support said arm in such a manner that an angle of said arm can be changed;
- a moire correction data generation circuit configured to perform frequency analysis of image data outputted from said X-ray detector, specifies a spatial frequency corresponding to a moire pattern, and generates moire correction data based on said specified spatial frequency;
- and
- a moire correction circuit configured to correct image data outputted from said X-ray detector based on said generated moire correction data.
An X-ray diagnostic apparatus comprising:
- an X-ray tube;
- an X-ray detector;
- a grid arranged on an image reception plane of said X-ray detector;
- an arm configured to support said X-ray tube and said X-ray detector in such a manner that a distance between said X-ray tube and said image reception plane of said X-ray detector can be changed;
- an arm support device configured to support said arm in such a manner that an angle of said arm can be changed;
- a frequency analysis circuit configured to subject image data outputted from said X-ray detector to frequency analysis and specify a spatial frequency corresponding to a moire pattern;
- and
- a moire correction circuit configured to attenuate a component of said specified spatial frequency included in image data outputted from said X-ray detector.
An X-ray diagnostic apparatus comprising:
- an X-ray tube;
- an X-ray detector;
- a grid arranged on an image reception plane of said X-ray detector;
- an arm configured to support said X-ray tube and said X-ray detector in such a manner that a distance between said X-ray tube and said image reception plane of said X-ray detector can be changed;
- a sensor configured to detect a distance between said X-ray tube and said image reception plane of said X-ray detector;
- an arm support device configured to support said arm in such a manner that an angle of said arm can be changed;
- a storage device configured to store moire image data when a distance between said X-ray tube and said image reception plane of said X-ray detector is a reference distance;
- a moire image enlargement circuit which is configured to enlarge said moire image data based on said distance detected by said sensor and said reference distance;
- and
- a moire correction circuit which corrects image data outputted from said X-ray detector based on said enlarged moire image data.
Dependencies are inferred from the claim text.