Respiration correction technique in positron emission tomography

Abstract

The invention relates to a respiration correction technique in positron emission tomography, in particular to a technique for correcting the artifact of respiration tomography on the basis of the sensitivity characteristics of a three-dimensional positron emission detector, belonging to the field of nuclear medical tomography. The correction method provided by the invention can effectively compensate for the image artifact caused by respiration, thereby improving the diagnostic accuracy of doctors. The correction method comprises the following steps: frame segmentation is carried out on the acquired dynamic data by using the variation characteristics of the geometric sensitivity of a scanning detector in the three-dimensional PET, wherein the number of intra-frame photons can reflect the phase position of the organ motion, and the number of photons of each phase position has a linear relation with the motion displacement thereof; accordingly, each phase position is moved to certain reference phase position point for correcting; and the image reconstructed at last constitutes the image artifact caused by the respiration in the PET improved by correction. Compared with the prior artlike the gating correction technique, the method of the invention dispenses with hardware equipment and extra preparation by patients or clinic before scanning, therefore, the method is easier, more effective and more reliable in actual application.

Description

technical field [0001] The invention relates to a respiration correction technology in positron emission imaging, in particular to an image blur correction technology caused by respiration in nuclear medicine positron emission PET (Positron Emission Tomography) imaging. It belongs to the technical field of nuclear medicine engineering imaging. Background technique [0002] Nuclear medicine PET imaging mainly uses coincidence line detection technology and positron nuclides and their labeled compounds for imaging. The images can reflect the metabolic state of the human body in normal or disease state from the molecular level. Because changes can appear in the early stages of disease, positron emission tomography enables early diagnosis of disease and provides an objective basis for treatment decisions. The application of this technology has played an important role in the early diagnosis and treatment planning of lung cancer patients. [0003] However, due to the particulari...

AI Technical Summary

Problems solved by technology

However, it has disadvantages such as algorithmic responsibility, large amount of calculation, etc.

[0006] Although all current gating techniques can reduce the artifacts of respiratory imaging and improve image quality, their biggest defect is that the signal-to-noise ratio of the corrected image signal is too low

Because only 10-15% of the available respiration acquisition data is used in the gated-corrected images, most of the 75-90% of the data is wasted

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