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A Method for Measuring CT Spatial Resolution by Improved Disk Carding Method

A technology of spatial resolution and measurement method, applied in the field of image processing, which can solve the problems of complex test process, large influence, and complicated calculation.

Active Publication Date: 2021-06-29
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disc card is easy to make, but the test process is complicated, and the test results require complicated calculations
In the calculation process of the disc card method, due to the noise and the insufficient precision of the disc card, this has a great impact on the most important step in the test process, that is, the calculation of the average gray level, and the final result of the spatial resolution will be different from the real one. There is a certain gap in the value

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  • A Method for Measuring CT Spatial Resolution by Improved Disk Carding Method
  • A Method for Measuring CT Spatial Resolution by Improved Disk Carding Method
  • A Method for Measuring CT Spatial Resolution by Improved Disk Carding Method

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Embodiment Construction

[0060] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict. Wherein, the accompanying drawings are used for illustrative purposes only, and represent only schematic diagrams rather than physical diagrams, and should not ...

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Abstract

The invention relates to a method for measuring CT space resolution by improving the disk clamping method, and belongs to the technical field of image processing. The method includes: S1: installing and starting the CT detection device, S2: fan-beam ray scanning; S3: reconstructing the two-dimensional image of the disc card: reconstructing the two-dimensional image of the disc card by using the fan-beam FBP algorithm according to the obtained projection data; S4: Use the RTV algorithm to obtain the denoised grayscale image; S5: Use the improved disc card method to calculate the reconstructed two-dimensional image and the denoised gray image, and obtain the average gray level of the edge of the disc card value; S6: Calculate the ERF and PSF curves to obtain the MTF curve and CT spatial resolution of the disc card. The present invention reduces the influence of noise and insufficient manufacturing precision of the disc card on the calculation of the average gray value of the edge when calculating the gray value of the edge of the disc card, thereby having more accurate and reasonable results when calculating the spatial resolution of the CT system.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a CT (Computed Tomography) spatial resolution measuring method which improves the disc card method. Background technique [0002] Spatial resolution, also known as high-contrast resolution, is an important indicator to describe the CT system. The current test methods include the wire pair card method, the circular hole card method and the disc card method. Although the testing process of the line pair card method and the round hole card method is simple, it requires high production requirements. The disk card is easy to make, but the testing process is complicated, and the test results require complicated calculations. In the calculation process of the disc card method, due to the noise and the insufficient precision of the disc card, this has a great impact on the most important step in the test process, that is, the calculation of the average gray level, and the final r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/04G01N23/046
Inventor 曾理程武昌沈宽龚长城
Owner CHONGQING UNIV
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