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Periodic pattern detection device and method

A detection device, periodic technology, applied in image enhancement, image analysis, radiation intensity measurement, etc., can solve the problem of not containing periodic patterns

Inactive Publication Date: 2014-11-05
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of photographing a subject using the irradiation field aperture, the area outside the irradiation field in the radiographic image is not irradiated with radiation, so the periodic pattern is not included

Method used

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  • Periodic pattern detection device and method
  • Periodic pattern detection device and method

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Embodiment Construction

[0066] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is a schematic block diagram showing the configuration of a radiographic diagnostic system to which the periodic pattern detection device according to the first embodiment of the present invention is applied. Such as figure 1 As shown, the radiation image diagnostic system is composed of a radiation generator 1, a radiation detector 2, an image processing device 3, an imaging control device 4, and a grid 5. The radiation generator 1 and the radiation detector 2 face each other with an object S interposed therebetween. ground configuration. Furthermore, the imaging control device 4 is connected to the radiation generator 1 , the radiation detector 2 , and the image processing device 3 , respectively, and the radiation detector 2 is also connected to the image processing device 3 . In addition, in the present embodiment, the subject S is equipped with a protec...

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Abstract

[Problem] To render possible the highly accurate detection of periodic patterns in cases when areas in which periodic patterns are more difficult to detect are included in an irradiation-field area. [Solution] An image acquisition unit (31) acquires a radiation image (P0) from a radiation detector (2), and an irradiation-field-area detection unit (32) detects an irradiation-field area (P1) from the radiation image (P0). An analysis-area setting unit (33) detects direct radiation areas, highly absorbent body areas, and high noise areas, as areas in which the presence of periodic patterns is unlikely, and excludes these areas from the irradiation-field area (P1) to set an analysis area (P2). A frequency analysis unit (34) performs frequency analysis with respect to the analysis area (P2) alone to detect frequency components of periodic patterns caused by an anti-scatter grid. A filtering processing unit (35) removes, from the radiation image (P0), the frequency components of the periodic patterns caused by the anti-scatter grid.

Description

technical field [0001] The present invention relates to a periodic pattern detection device and method for detecting the frequency component of the periodic pattern when suppressing the periodic pattern contained in the image. Background technique [0002] Conventionally, in the medical field and the like, various radiation detectors for recording radiation images of a subject by irradiation of radiation transmitted through the subject have been proposed and put into practical use. As such a radiation detector, for example, there is a radiation detector using amorphous selenium that generates charges by irradiation with radiation. In an imaging device using this radiation detector, between a radiation source that irradiates radiation and the radiation detector, lead or the like that does not transmit radiation and aluminum or wood that easily transmits radiation are provided in a predetermined manner. Scattered radiation removing gratings (hereinafter simply referred to as ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00
CPCA61B6/5205A61B6/4291A61B6/5252A61B6/06A61B6/107A61B6/5258G06T5/10G06T2207/10116G06T2207/20056G06T5/70G01T1/16
Inventor 今井睦朗
Owner FUJIFILM CORP