Radiation imaging apparatus and method for controlling same
A technology of radiography and radiographic images, which is applied in the fields of radiological diagnosis instruments, medical science, diagnosis, etc., can solve the problems of difficult and high-precision offset correction, difficult to ensure the accuracy of offset correction, etc.
Active Publication Date: 2015-01-28
CANON KK
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[0007] However, in the offset correction method described above, since the offset image is obtained after X-ray irradiation (timing 712), there is a problem that the time period from X-ray irradiation to displaying the preview image ( Figure 7 T6 in ) becomes longer
Therefore, it is difficult to ensure the accuracy of offset correction
In particular, it is difficult to perform high-precision offset correction at or near the time of device start-up where the offset fluctuates
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[0020] An example of a preferred embodiment of the present invention will now be described with reference to the accompanying drawings. In the following embodiments, an X-ray imaging apparatus is described as an example of a radiation imaging apparatus for obtaining an X-ray image as a radiographic image by performing imaging using X-rays as radiation. figure 1 is a block diagram showing one example of a schematic configuration of the X-ray imaging apparatus according to the present embodiment.
[0021] Such as figure 1 As shown, the X-ray imaging apparatus 10 according to the present embodiment includes an X-ray generating unit 1 , an operation input unit 2 , an imaging control unit 3 , a sensor 4 and a display unit 5 . The imaging control unit 3 includes a control unit 301 , a correction unit 306 , and a storage device 311 . The control unit 301 includes a CPU (not shown), and functions as an X-ray image obtaining unit 302, an imaging condition setting unit 303, an offse...
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A radiation imaging apparatus performs radiation image obtaining processing in accordance with an exposure instruction, and obtains a radiation image. Then the radiation imaging apparatus performs offset correction for the obtained radiation image, and displays it. The radiation imaging apparatus determines, in accordance with a predetermined criterion, whether or not offset images obtained by offset image obtaining processing are stable over time. Then, if it is determined that the offset images are not stable, offset correction is performed by using an offset image obtained by performing offset image obtaining processing, following the obtaining of the radiation image. If it is determined that the offset images are stable, the offset correction is performed by using an offset image obtained before the obtaining of the radiation image.
Description
technical field [0001] The present invention relates to a radiation imaging apparatus and a control method thereof. Background technique [0002] Currently, in medical X-ray still image imaging systems, a film method is widely used. In this method, an object is irradiated with X-rays, and the transmitted X-ray images are exposed on a film. Such film methods provide functions for displaying and recording information, they allow a large area, exhibit good grayscale characteristics, and are lightweight and portable. Therefore, the film method is widely used throughout the world. However, film methods require space, labor and time due to the complexity arising from the required development process and the need to maintain long-term storage and accessibility. [0003] In recent years, hospitals have seen an increasing demand for digital X-ray images. Radiation imaging apparatuses that convert radiation into electrical signals and form images by a plurality of radiation detecti...
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IPC IPC(8): A61B6/00
CPCA61B6/5205A61B6/585A61B6/5258
Inventor 山中信司
Owner CANON KK