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Apparatus and method for the correction of scatter in a radiographic system

一种X射线、散射核的技术，应用在校正射线照相系统中散射的装置领域，达到消除散射的效果

Active Publication Date: 2019-11-01
IBEX INNOVATIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although the invention described in WO2016 / 051212 reduces the X-ray dose and improves the signal-to-noise ratio, the structures used to modify the X-ray signal still absorb X-ray radiation

Method used

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  • Apparatus and method for the correction of scatter in a radiographic system
  • Apparatus and method for the correction of scatter in a radiographic system
  • Apparatus and method for the correction of scatter in a radiographic system

Examples

Experimental program
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Effect test

Embodiment 1

[0110] An image of a sample consisting of a 7.6 cm block of PMMA with 1.36 cm of aluminum embedded inside was taken and the image was cleaned of scatter.

[0111] Obtain X-ray images of the observations using an X-ray imaging system. The imaging system includes American general medical system composed of 3mm aluminum filter plate, 80kV, 5mA tungsten tube and Raines detector.

[0112] A set of embodied training materials representing the samples consisted of five 5 cm thick PMMA plates and five 1 cm thick aluminum plates.

[0113] Images of this set of training materials were taken using X-ray imaging equipment as follows.

[0114] For PMMA, obtain the first x-ray image of a sample consisting of a 5 cm thick PMMA plate from this training set. Take a second, third, fourth and fifth image, each time adding a 5cm thick PMMA plate from this training set.

[0115] For aluminum, obtain the first x-ray image of a sample consisting of a 1 cm thick aluminum plate from this training s...

Embodiment 2

[0126] Figure 10a and Figure 10b The images shown in are after correcting scattering according to the method of the present invention respectively ( Figure 10a ) and for comparison the femoral neck after scattering correction with the anti-scatter grid ( Figure 10b ). These images were captured on a General Motors VMX Plus mobile X-ray system equipped with a Raines 1417Csl detector.

[0127] Figure 10a and Figure 10b The images in are taken with the equivalent beam of 6.4mA and 75kV, and the distance from light source to detector is 115cm. Figure 10a The image is not affected by the absorption loss associated with the anti-scatter grid, which means that, even with the same dose to the patient, Figure 10a The dose at the middle detector is also significantly higher. A comparison of the signal-to-noise ratio (SNR) of the entire image shows that using the scatter reduction method of the present invention is beneficial over the use of an anti-scatter grid. Notice, ...

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Abstract

An x-ray imaging method comprises the steps of: providing a set of at least one training material, the set comprising different materials and / or different thicknesses of the or each material; obtaining observed x-ray images of the at least one training material with a pixellated detector; building a database in a simulator of simulated scatter kernels for variable parameters within the simulator for each of the at least one training material; generating a transfer function between parameters of the simulator and parameters of the observed image which is independent of sample type and thickness; generating a whole image scatter estimate; predicting the direct radiation for each scatter kernel; applying the transfer function to the scatter estimate and the direct radiation or the inverse ofthe transfer function to the observed intensity values; performing the calculation Z-S-D < threshold to provide scatter free data and / or a scatter free image.

Description

technical field [0001] The present invention relates to a device and method for correcting scatter in a radiographic system, and mainly relates to a device and method without using an anti-scatter grid. Background technique [0002] When an object is exposed to X-ray radiation, some X-ray photons are absorbed, some pass through the object without scattering, and hit the X-ray detector, which is called "direct radiation". Some X-rays are absorbed, while others are scattered. The intensity of the resulting scatter may exceed the magnitude of the direct radiation detected by the detector. Scattered radiation reduces contrast and increases noise, resulting in lower image quality. The absorbed X-rays create contrast in the X-ray image. If scattered X-ray photons hit the detector, random noise in the image increases because it is impossible to discern where the scattered X-ray photons came from. [0003] To solve the scattering problem, the most common method is to place an an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/00
CPCA61B6/5282A61B6/583A61B6/00G01T1/29G06T11/005G06T2207/20224G06T2207/10081G06T2207/10116G06T5/70G06T7/0012A61B6/4233A61B6/4291A61B6/482A61B6/5205
Inventor 尼尔·洛斯利保罗·斯科特
Owner IBEX INNOVATIONS LTD
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