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Radiation imaging apparatus

A photographing device, radiation technology, applied in the fields of radiological diagnosis instruments, medical science, image data processing, etc., can solve problems such as insufficient irradiation dose and errors

Inactive Publication Date: 2010-03-31
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even if the detection object with movement is simply subtracted from the image with time difference, there are obvious errors caused by the calculation process
In order to minimize this error, the shooting rate is increased to minimize the time difference, and the energy irradiated per unit time becomes larger as the shooting rate is increased, so that the low-pressure side becomes insufficiently irradiated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]

Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. figure 1 It is a block diagram of the X-ray imaging apparatus of Examples 1-3. Including Embodiments 2 and 3 described later, in Embodiment 1, a flat-panel X-ray detector (hereinafter, abbreviated as 'FPD') is used as a radiation detection unit as an example, and an X-ray imaging device is used as an example It will be described as a radiation imaging device.

[0024]

X-ray imaging devices such as figure 1 As shown in , it includes a desktop 1 on which an inspection object M is mounted, an X-ray tube 2 for irradiating X-rays to the inspection object M, and an FPD 3 for detecting X-rays transmitted through the inspection object M. The X-ray tube 2 corresponds to the radiation irradiation unit of the present invention, and the FPD 3 corresponds to the radiation detection unit of the present invention.

[0025]

The X-ray imaging device also includes a desktop con...

Embodiment 2

[0054]

Next, Embodiment 2 of the present invention will be described with reference to the drawings. Image 6 It is a schematic diagram showing the flow of each image data related to the second embodiment.

[0055]

Such as Image 6 As shown in , assuming that the composite low-voltage image is H', in the second embodiment, the composite image generator 9b generates a composite high-voltage image H' for each time between the same high voltages based on the two high-voltage images H. Especially, in this embodiment 2, such as Image 6 As shown in , the composite image generator 9b generates a composite high-voltage image H' of 2m frames based on the high-voltage images H of (2m-1) frames and the high-voltage images H of (2m+1) frames. As a specific example of generation, a composite high-voltage image H' of 2m frames is generated by adding (2m-1) high-voltage images H and (2m+1) high-voltage images H. The synthesized high-voltage images H' of 2m frames generated in the syn...

Embodiment 3

[0062]

Next, Embodiment 3 of the present invention will be described with reference to the drawings. Figure 7 It is a schematic diagram showing the flow of each image data related to the third embodiment.

[0063]

Such as Figure 7 As shown in , in the third embodiment, the composite image generator 9b generates a composite high-voltage image H' at each time between the same high voltages based on the two high-voltage images H, and the composite image generator 9b generates a composite high-voltage image H' based on the two low-voltage images L , generating a composite low voltage image L' for each time between the same low voltages. Especially, in the present embodiment 3, such as Figure 7 As shown in , the synthesized image generator 9b generates a synthesized high-voltage image H' as a (2m+1) frame based on the high-voltage image H of 2m frames and the high-voltage image H of (2m+2) frames, and the synthesized image generator 9b generates a synthesized high-voltage ...

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Abstract

In a radiation imaging apparatus, a composite image generating means periodically generates composite high-voltage / low-voltage images of the same high-voltage / low-voltage on the basis of a plurality of high-voltage / low-voltage images acquired sequentially by a high-voltage / low-voltage image acquiring means and a subtraction processing means performs subtraction processing for the high-voltage andlow-voltage images on the basis of the composite high-voltage / low-voltage images generated by the composite image generating means to acquire subtraction images. This minimizes errors due to arithmetic processing while ensuring a sufficient dose.

Description

technical field [0001] The present invention relates to a radiographic apparatus for radiographic imaging, and more particularly to a technique for performing subtraction processing. Background technique [0002] In radiographing, an energy subtraction method is used to extract an image of a soft body portion or an image of a bone portion. By acquiring a high-voltage image and a low-voltage image, and performing subtraction processing on these images, it is possible to output a subtraction image of a soft body part or a bone part. In recent years, in order to perform energy subtraction using moving images, it has been proposed to alternately irradiate radiation corresponding to a high voltage value and radiation corresponding to a lower voltage value, and to alternately acquire high-voltage images and low-voltage images sequentially. A method of acquiring a subtraction image (for example, refer to Patent Document 1). In the method of this patent document 1, any one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00G06T1/00
CPCA61B6/482A61B6/032A61B6/405
Inventor 酒井泷人
Owner SHIMADZU SEISAKUSHO CO LTD