Radiological image capturing system and radiological image capturing method

Abstract

There is described a radiological image capturing system, which makes it possible to obtain an accurate radiological image, irrespective of the position of the diagnosis object in the thickness direction of the subject. The system includes a radiographing apparatus that output radiological image data, based on the radial rays detected by the image detecting device, an image processing apparatus that applies a degraded image restoration processing to the radiological image data and a fixing member onto which the subject is fixed. The subject is positioned at such a position that a ratio of blurs between the first radiological image radiographed at a first position and the second radiological image radiographed at a second position, which is apart from the image detecting device by a distance farther than that of the first position, is reduced to a value to such an extent that a blur difference between them can be ignored.

Description

technical field [0001] The present invention relates to a radiographic imaging system and a radiographic imaging method in which a subject is irradiated with radiation to capture a radiographic image of the subject. Background technique [0002] In recent years, the performance of radiation irradiators and radiation detectors used in radiographic imaging systems has been improved, and in conjunction with CAD (Computer-Aided Diagnosis), fine early-stage lesions can be found from radiographic images. In addition, in radiographic imaging systems, there is a demand for capturing high-definition images with a low dose of radiation so that fine lesions can be diagnosed with high precision. [0003] Therefore, in a normal radiographic image, blurring occurs due to scattered radiation appearing inside the subject. Here, in order to obtain a high-definition radiographic image by eliminating the blurring, a radiographic imaging system is proposed in which a point spread function (Poi...

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Problems solved by technology

[0006] However, during examination, since the lesion and internal organs of each patient are different, when the lesion or internal organs of the object of diagnosis are not symmetrical in the object such as the body shape of the object is different, even as in the patent document 1 or Patent Document 2, if the degradation restoration is performed using a predetermined PSF corresponding to the imaging conditions as an image restoration parameter, it may not be possible to perform accurate degradation restoration on a blurred image.

[0007] That is, there is a problem that if the position of the diagnostic object in the thickness direction of the object is different from patient to patient, the point image distribution of the X-rays passing through each diagnostic object is different. Restoration parameters are also different, and the radiographic images of each diagnostic object cannot be degraded and restored correctly by degraded restoration processing using one image restoration parameter

[0008] On the contrary, if different image restoration parameters are used for the position of the diagnostic object in the thickness direction of each object to perform degradation restoration processing, then another problem arises, that is, the processing content becomes very complicated and costs a lot. , in addition, high efficiency of processing cannot be realized,

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