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PET flight time state quality detection method and PET scanning device

A quality inspection method and time-of-flight technology, applied in computerized tomography scanners, echo tomography, etc., can solve problems such as time-consuming, and achieve the effect of simple operation

Active Publication Date: 2017-03-29
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

However, the common problem with this method is that the radioactive source needs to be positioned at the center of the PET scanning cavity, and the case where the radioactive source is placed off-centre cannot be handled, and it takes a lot of time for the operator to locate the center of the scanning cavity

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  • PET flight time state quality detection method and PET scanning device
  • PET flight time state quality detection method and PET scanning device
  • PET flight time state quality detection method and PET scanning device

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Embodiment Construction

[0038] In order to make the above objects, features and advantages of the present invention more obvious and comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0039] In PET imaging, the positrons emitted by the nuclide carried in the tracer drug annihilate with the electrons in the detected object to produce two gamma photons with opposite directions and energy of 511KeV (such an annihilation is called a coincidence event). The PET probe is composed of several detector rings. The number of detector rings determines the size of the PET axial field of view and the number of fault planes. The axial field of view of the PET is perpendicular to the plane of the detector ring. Such as figure 1The projection line shown in the coincidence detection is called the Line of Response (LOR). After obtaining a large number of coincidence events, the distribution of radionuclide...

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Abstract

The invention discloses a PET flight time state quality detection method. The method comprises the steps that a die body is arranged in the PET scanning view range, and the axis of the die body is parallel to the axis of the scanning view range; a coincidence event is detected, coincidence data are obtained, and the position of the die body is obtained according to the coincidence data; according to the position of the die body, the difference of flight time from two photons of the coincidence event on a response line to a pair of detector crystals is calculated, wherein the difference of flight time is decided by the position; according to the flight time sine chart of the coincidence data and a to-be-detected time compensation table, the flight time difference measurement value of the response line is obtained; whether the flight time state quality is qualified or not is judged by comparing whether the flight time difference decided by the position and the flight time difference measurement value are equal or not. The flight time state quality can be accurately detected without arranging the die body at the center position of a scanning cavity, and operation is easy. In addition, the invention provides a PET scanning device.

Description

[0001] 【Technical field】 [0002] The invention relates to quality state detection of medical imaging equipment, in particular to a PET time-of-flight state quality detection method and a PET scanning device. [0003] 【Background technique】 [0004] Positron Emission Tomography (PET), as today's high-level nuclear medicine technology, is also recognized as one of the most advanced large-scale medical diagnostic imaging equipment in the current medical field, and has become indispensable for the diagnosis of tumors and heart and brain diseases. important method. Its working principle is as follows: inject radiopharmaceuticals capable of emitting positrons into the organism, and the positrons annihilate with the electrons in the organism. According to the law of conservation of energy and the law of conservation of momentum, a pair of Gamma photons; the detector array surrounding the measured object performs coincidence measurement on these photons moving in the opposite directi...

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Application Information

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IPC IPC(8): A61B6/03
Inventor 吕新宇
Owner SHANGHAI UNITED IMAGING HEALTHCARE