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X-ray computerised tomograph capable of automatically subducing boundary false image

A computerized and automatic technology, applied in the field of medical image processing, which can solve the problems of increasing machine cost, inability to remove image artifacts, and increasing X-radiation dose, etc.

Active Publication Date: 2005-08-24
NEUSOFT MEDICAL SYST CO LTD
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Problems solved by technology

The former reduces the use efficiency of CT and increases the dose of X-radiation received by the scanned patients, and this method may not be able to remove the artifacts in the images for patients with fatter bodies; the latter uses a larger phantom, which may The correction effect will be affected due to the effects of X-ray hardening and scattering, which will affect the quality of the corrected image in the smaller phantom that is acceptable; at the same time, the increase of the phantom will increase the cost of the machine, and it is necessary to re-execute the calibration work. It will also increase the complexity of the calibration work

Method used

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  • X-ray computerised tomograph capable of automatically subducing boundary false image
  • X-ray computerised tomograph capable of automatically subducing boundary false image
  • X-ray computerised tomograph capable of automatically subducing boundary false image

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Embodiment Construction

[0043] First, the calibration curve h(x) is obtained when the water model is used for calibration calculation, such as figure 1 a, Between this calibration curve [185, 535] is the range covered by the water model. For the part between [0, 185] and [535, 720] that cannot be covered by the water model, the original way is to operate by assigning the same value to the simple boundary. Such as figure 1 As shown in a, this operation results in figure 2 The appearance of streaking artifacts within the circles shown in a.

[0044] To remove this artifact, we wish to use the corrected figure 1 The curve in a is extended according to a certain characteristic of the machine. Such as figure 1 The performance curve g(x) of the machine shown in b. This curve is the filter material for each channel that objectively exists between the bulb and the detector. This filter substance curve cannot be represented by a simple polynomial, or not analytically. By the method of the present inv...

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Abstract

A CT machine able to automatic subduce the false edge image features that the calibrating curve of original model is analyzed and extended according to the performance of the machine to calibrate the excessive part of curve, and the calibrated curve is input to its computer to subduce the false edge image. Said analyzing and extending method includes such steps as maintaining the central part of calibrating curve for original model, analyzing and extending the excessive part of curve, and smoothing the edge interface by interpolation method.

Description

technical field [0001] The invention belongs to the technical field of medical image processing, in particular to a processing technology for image artifacts in an X-ray computer tomography machine. Background technique [0002] An X-ray computed tomography (X-ray computed tomography, hereinafter referred to as CT) machine needs to use a calibration curve to calibrate the scan data to obtain a CT image that can be used for diagnosis. The calibration curve is mainly obtained by pre-scanning the calibration phantom before the machine is used, that is, in order to obtain the ideal CT image quality, the CT machine uses phantoms similar in shape and size to different parts for processing. Under normal circumstances, these phantoms can meet the correction needs, but some special patients are obese or difficult to adjust their positions due to illness, so that the scan data exceeds the phantom correction range, resulting in edge artifacts in the image and affecting the image quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03G06T7/00
Inventor 孙海宁楼珊珊张坚刘晋军李双学
Owner NEUSOFT MEDICAL SYST CO LTD
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