Radiation detection measurement and imaging method and variable-structure PET equipment

Abstract

The invention discloses a radiation detection measurement and imaging method and variable-structure PET equipment. The method comprises the following steps: (1), determining the spatial position of a to-be-measured and -imaged region; (2), adjusting the angle of at least one detector, enabling the central axis of the adjusted detector to pass through the to-be-measured and -imaged region; (3), carrying out measurement or imaging, wherein a detector for measurement or imaging comprises a detector which is adjusted partly or wholly. Through the adjustment of the rotating angle of the detector in PET equipment in a fixed rack, the method enables the central axis of at least one detector to be gathered in the to-be-measured and -imaged region, so that paired gamma rays transmitted from the region can enter into crystals of corresponding detectors as vertically as possible, eliminates the loss, caused by a depth effect, of spatial resolution as much as possible, and improves the spatial resolution of the system in the to-be-measured and -imaged region.

Description

technical field [0001] The invention belongs to the field of medical imaging equipment, and relates to an imaging technology, in particular to a tomography method and device. Background technique [0002] In the field of radiation detection measurement and imaging, the detector used is generally a structure coupled with a scintillation crystal and a photomultiplier device. Since the scintillation crystal has a certain thickness, when the ray is obliquely incident into the crystal, it will be converted into Visible photons are then detected by optoelectronic devices. Since the detector cannot know the specific depth of the interaction between the ray and the crystal, it can only use the coupling surface of the crystal and the detector as the position information of the ray being detected by the crystal. Therefore, it will lead to "depth effect" (depth of interaction, DOI), and the resulting tangential positioning error will reduce the accuracy of radiation detection measurem...

AI Technical Summary

Problems solved by technology

At the center of the field of view of the PET imaging system, since the central axes of all detectors converge here, the "depth effect" has little influence, and the spatial resolution here is higher; the closer to the edge of the field of view, the generated γ The greater the angle at which the ray cuts into the crystal, the greater the "depth effect" and the loss of spatial resolution

It can be seen that the traditional PET imaging system is affected by the "depth effect", and its spatial resolution will be reduced, and the closer to the edge of the field of view, the more serious the impact on its spatial resolution

At the same time, in clinical practice, it is often necessary to obtain high-quality PET imaging for local parts. Traditional PET systems cannot adjust the system structure according to the location of interest and improve the spatial resolution of specific locations.

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