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Test method for evaluating spectrographic imaging after applying ct attenuation correction

A test method, attenuation correction technology, applied in applications, 2D image generation, instruments used for radiological diagnosis, etc., can solve the problem that CTAC does not have a test test method, etc.

Active Publication Date: 2020-07-07
BEIJING INST OF MEDICAL DEVICE TESTING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, as an important function of the SPECT / CT all-in-one machine, CTAC currently has no corresponding test method

Method used

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  • Test method for evaluating spectrographic imaging after applying ct attenuation correction
  • Test method for evaluating spectrographic imaging after applying ct attenuation correction
  • Test method for evaluating spectrographic imaging after applying ct attenuation correction

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Embodiment Construction

[0036] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] 1. Provide test phantom

[0038] figure 1 Shown is the test phantom provided by the present invention, and polymethyl methacrylate can be used as the material. This phantom is the head phantom and should be placed on the examination table, centered on the axial field of view, but displaced (vertically) 25 mm off-axis. Should be used 60mm from the axis of the phantom, and in increments of 120°, such as figure 1 3 cylindrical inserts with a diameter of 50 mm are arranged. For CT measurements, the phantom should be filled with non-radioactive water. One hollow cylindrical insert should be filled with non-radioactive air, the other with non-radioactive water, and the third insert is solid and made of a substance close to the density of bone, such as polytetrafluoroethylene, or a solution of calcium phosphate . For SPECT measurements, ...

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Abstract

The invention provides a testing method for evaluating SPECT imaging after application of CT attenuation correction. A test mold body adopted in the method is a cylindrical mold body composed of three cylindrical inserts with the diameter of 50 mm according to the increment of a 120-degree angle, and the distance between the cylindrical inserts and a mold body shaft is 60 mm. An SPECT image is subjected to summation in the axial direction, three round regions of interests (ROIs) with the diameter of 30 mm are specified in the SPECT image obtained after summation, and the centers of the regions are aligned to images of the inserts of air, solids and air correspondingly. Nine ROIs with the diameter of 30 mm are further specified and are all located in an even radial region. According to the method, the performance and actual clinical operation process of a mainstream SPECT / CT product are considered, and the method can be used for SPECT / CT product performance evaluation and quality control.

Description

technical field [0001] The invention relates to a test method for CT attenuation correction, in particular to a test method for applying CT attenuation correction in a SPECT / CT integrated machine. Background technique [0002] The method of CT attenuation correction (CTAC) has become a hot spot in the research of nuclear medicine technology. Search the keyword "SPECT CT ATTENUATION correction" from the PubMed academic paper database, and get 252 search results, the earliest related result is A technique for using CTimages in attenuation correction and quantification in SPECT published on Nucl Med Commun by Fleming JS in 1989 . The important value of CTAC to clinical diagnosis has been elaborated in many papers. For example, in the article SPECT / CT published by Scheidhauer et al. on J Nucl Med in 2008, an intuitive comparison with actual clinical images proved that CTAC can improve the accuracy of diagnosis. properties, especially in myocardial perfusion imaging. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03G06T11/00
CPCA61B6/032A61B6/037A61B6/52A61B6/5235A61B6/58G06T11/003G06T2207/10081
Inventor 冯健李文王培臣
Owner BEIJING INST OF MEDICAL DEVICE TESTING