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Tomographic image reconstructing process and radiographic apparatus

A technology of tomography and radiography, used in diagnosis, instruments for radiological diagnosis, material analysis using wave/particle radiation, etc., can solve the problem that reconstruction calculation takes a long time, and achieve the effect of reducing calculation time

Inactive Publication Date: 2003-03-05
SHIMADZU SEISAKUSHO CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

It can be seen that the total computational complexity of the prior art involves 11×n×n×Np steps, therefore, the reconstruction calculation takes a long time

Method used

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  • Tomographic image reconstructing process and radiographic apparatus
  • Tomographic image reconstructing process and radiographic apparatus
  • Tomographic image reconstructing process and radiographic apparatus

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Embodiment Construction

[0045] Referring to the accompanying drawings, preferred embodiments of the present invention will be described in detail below.

[0046] Fig. 3 is a block diagram of an X-ray radiographic apparatus, which is an example of radiographic apparatus according to the present invention. This X-ray radiography apparatus includes an input unit 10 for inputting various information and instructions, an apparatus controller 20 for controlling the entire apparatus (such as an X-ray radiography operation based on the input information and instructions), an A driver 30 for manipulating the image acquisition station 40 under the control of the device controller 20, an image acquisition station 40 for acquiring an image of a target area of ​​the object M, and an image acquisition station 40 for collecting image information acquired by the image acquisition station 40 The image collector 50, an image processor 60 for performing predetermined image processing such as image reconstruction in ord...

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Abstract

An X-ray tube (X-ray focus) and an X-ray detector opposed to each other across an object synchronously scan the object to acquire radiographic data in each scan position. A section reconstruction method is provided in which the radiographic data or data resulting from a filtering process of the radiographic data is projected as back projection data back to a two-dimensional or three-dimensional reconstruction area virtually set to a region of interest of the object. Enlarged interpolation data is generated by interpolating the back projection data and then the enlarged interpolation data is projected back to the reconstruction area without interpolation. The number of interpolation computations is reduced to an amount corresponding to the enlargement by interpolation of the back projection data, to shorten the reconstruction computation time.

Description

technical field [0001] The present invention relates to a tomographic image reconstruction method for projecting radiographic data obtained at each scanning position or filtered radiographic data back-projected onto a reconstruction area as back-projection data, and to various applications in medical, industrial and other fields. A tomographic device used for radiographic examination and reconstruction of tomographic images of patients or objects. In particular, the invention relates to a technique for speeding up backprojection in reconstruction operations. Background technique [0002] Fig. 1 shows a conventional X-ray tomography apparatus. The apparatus includes an X-ray focal point f and an X-ray detector 42 with an array of X-ray detecting elements facing each other across the object or patient. The X-ray focus f and the X-ray detector 42 are simultaneously rotatable around the axis of the object to intermittently emit X-rays to the object from different angles for ra...

Claims

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Application Information

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IPC IPC(8): G10L15/06A61B6/02G01N23/00
Inventor 浮田昌昭岸武人大西修平新谷锐一
Owner SHIMADZU SEISAKUSHO CO LTD
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