Test method as well as correction method and device for detection efficiency of PET (positron emission tomography) system

A technology of positron emission and detection efficiency, applied in radiological diagnostic testing/calibration, computerized tomography scanners, instruments for radiological diagnosis, etc., can solve problems such as difficult implementation and unsatisfactory accuracy, and achieve easy implementation and solution Irregular changes with activity and the effect of improving imaging uniformity

Active Publication Date: 2017-01-04
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0009] The present invention solves the problem that the existing positron emission tomography system multi-factor normalization correction method has unsatisfactory accuracy and difficult realization due to the inherent crystal detection efficiency changing with the activity

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  • Test method as well as correction method and device for detection efficiency of PET (positron emission tomography) system
  • Test method as well as correction method and device for detection efficiency of PET (positron emission tomography) system
  • Test method as well as correction method and device for detection efficiency of PET (positron emission tomography) system

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] In one embodiment of the present invention, as figure 1 As shown, the PET apparatus 1 has a control unit 10 as a center, and includes a frame 20 , a signal processing unit 30 , a coincidence unit 40 , a storage unit 50 , a reconstruction unit 60 , a display unit 70 and an operation unit 80 .

[0028] figure 2 It is a schematic cross-sectional view of the detector ring 100 configured on the rack 20 . The frame 20 has a detector array composed of a plurality of detector rings 100 arranged along the central axis Z of the circumference. The detector ring 100 has a plurality of detectors 200 arranged on a circumference around a central axis Z. As shown in FIG. A field of view (Field Of View, FOV) is formed on the opening of the detec...

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Abstract

The invention provides a test method as well as a correction method and device for detection efficiency of a PET (positron emission tomography) system. The test method comprises steps as follows: using the PET system for first acquisition to obtain a first activity related factor affecting the detection efficiency; using the PET system for second acquisition to obtain a second activity related factor according to data obtained through the second acquisition as well as the first activity related factor; removing information affected by the second activity related factor and information affected by geometric distribution information of an acquired object from the data obtained through the second acquisition so as to obtain inherent crystal detection efficiency of a detector. Further, the inherent crystal detection efficiency of the detector is used for correction. The acquired data is subjected to adaptive correction in combination with geometrical structure factors and activity related factors on the basis of the obtained inherent crystal detection efficiency of the detector, so that normalization correction of the system is completed conveniently and accurately.

Description

technical field [0001] The invention relates to a positron emission tomography system, in particular to the technical field of correction of a positron emission tomography system. Background technique [0002] Positron Emission Tomography (PET) has become an important molecular imaging tool in preclinical research and clinical diagnosis, and its imaging performance is closely related to the data preprocessing method before image reconstruction. Data preprocessing includes normalization correction, random correction, scatter correction, attenuation correction, etc. Among them, normalization correction is the first step of preprocessing, and its accuracy directly determines the accuracy of subsequent scattering correction and random correction, thereby affecting the performance of the final reconstructed image, such as uniformity, noise characteristics, and artifact characteristics. [0003] Affected by the structure design of the PET system, the coupling mode of the front-en...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03A61B6/00
CPCA61B6/037A61B6/58
Inventor 郭金霞吕杨唐嵩松
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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