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X-ray scatter correction

A scatter image, backscatter grid technology, used in X-ray equipment, instruments for radiological diagnosis, instruments, etc.

Inactive Publication Date: 2009-02-04
UNIVERSITY OF ROCHESTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technique needs to determine the convolution kernel instead of using the existing convolution kernel for cubic spline interpolation

Method used

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Embodiment Construction

[0090] A preferred embodiment of the present invention will now be set forth in detail with reference to the accompanying drawings, wherein like reference numerals designate like elements or steps throughout.

[0091] The preferred embodiment incorporates x-ray beam compensation filters (bow-tie filters), air gap techniques, backscatter grids and scatter correction algorithms as described below to reduce and correct scatter. A preferred system configuration therefore consists of an x-ray tube for producing a conical x-ray beam, a bow-tie filter, an anti-scatter grid in front of the 2D detector, the 2D detector and a computer system , used to control the system and process the two sets of projections to obtain scatter-corrected projections and to reconstruct 3D images from one set of scatter-corrected projections. There should be two versions of the system: one with a beam interceptor array (BSA) in place and one without the BSA.

[0092] The technique used in this preferred e...

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Abstract

In cone-beam volume computed tomography or similar imaging techniques, the effects of x-ray scatter are reduced through using a beam compensation filter (a bow tie filter), air gap technique, and an antiscatter grid and corrected through the use of a beam stop array combined with interpolation or convolution operation. Images are taken with the beam stop array, and a larger number of images are taken without the beam stop array. The images taken with the beam stop array are spatially interpolated to derive scatter information, which is then angularly interpolated to provide as many scatter images as there are images taken without the beam stop array. The interpolations are performed through cubic spline interpolation or any other interpolation techniques or low-pass filtering operation (convolution operation with a selected kernel). Each scatter image is subtracted from a corresponding one of the images taken without the beam stop array to provide a sequence of scatter-corrected images.

Description

technical field [0001] The present invention relates to a system and method for reducing X-ray scatter in an imaging system, and more particularly to a system and method for reducing scatter using spatial and temporal interactions. The invention is applicable to several imaging techniques, including fan-beam CT and cone-beam CT. Background technique [0002] Scatter reduction and correction is required for medical imaging applications such as clinical imaging and small animal imaging, and non-medical imaging applications such as explosives detection, non-destructive testing, and industrial image-guided manufacturing applications. Compton scattering interactions are always present in the x-ray energy range useful for imaging (10 keV to several MeV). In some x-ray spectral bands, x-ray scattering interactions dominate. For example, in the effective energy range of medical diagnostic CT (60-80keV), when x-ray photons pass through water-like soft tissues, relative to photoelec...

Claims

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Application Information

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IPC IPC(8): A61B6/03A61B6/02G06T11/00
CPCA61B6/5282A61B6/483A61B6/032A61B6/4291A61B6/508A61B6/5235Y10S378/901A61B6/4085G06T11/005A61B6/027A61B6/4035A61B6/583
Inventor 劳拉·宁
Owner UNIVERSITY OF ROCHESTER