Breathing movement gating correction and attenuation correction method based on PET/CT imaging

Abstract

The invention belongs to the technical field of nuclear medical imaging and provides a breathing movement gating correction and attenuation correction method based on PET / CT imaging. The method comprises the following steps: obtaining phantom original data and CT image data of a detected object through PET / CT scanning; carrying out gating correction on the original data to obtain new gating data; reading in CT image data by analyzing and processing software, obtaining CT attenuation coefficient according to a CT image, converting the CT attenuation coefficient into an attenuation correction coefficient under PET energy, and solving an attenuation correction factor on each response line; importing the gating data into the analyzing and processing software and multiplying with the obtained attenuation correction factor, so as to obtain data after attenuation correction; and rebuilding the data after the gating correction and attenuation correction, so as to obtain a clear PET image. The method provided by the invention has the advantages that not only is the scanning time shortened, and also better image quality is obtained compared with an image only subjected to the gating correction.

Description

technical field [0001] The invention belongs to the technical field of nuclear medicine imaging, and in particular relates to a respiratory motion gating correction and attenuation correction method based on PET / CT imaging. Background technique [0002] In the scanning imaging process of PET / CT (Positron Emission Tomography / Computed X-ray Tomography), the respiratory movement of the lung is an important factor affecting the imaging of the lungs. In order to improve the accuracy of diagnosis, the recent ten Over the past few years, scholars at home and abroad have studied and proposed many respiratory motion correction methods. Among all respiratory motion correction methods, gating correction is the most widely used respiratory motion correction method. This method reduces the respiratory motion of PET images. Artifacts. [0003] In addition to respiratory movement affecting the image quality of PET / CE, among many factors, the attenuation effect is also an important factor ...

AI Technical Summary

Problems solved by technology

The advantage of this method is that there is no need to convert between photon energies, but this limits the count rate that can be achieved by obtaining consistent data. In addition, the time required for transmission scanning is too long, and a FOV (scanning field of view) scan needs 10 to 15 minutes

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