Positron emission tomography (PET) and computed tomography (CT) cross-modality medical image fusion method based on wavelet transform

Abstract

The invention discloses a discloses a positron emission tomography (PET) and computed tomography (CT) cross-modality medical image fusion method based on wavelet transform, comprising the following steps shown in the figure 1: fixing a patient in a locating frame; acquiring a PET image according to the frame and simultaneously utilizing the locating frame to acquire a CT image; respectively extracting the PET image and the CT image; registering the extracted PET image and the extracted CT image according to locating points obtained in the locating frame; carrying out wavelet decomposition and variation solving fusion on the rectified PET image and the registered PET image and the registered CT image; and finally carrying out wavelet inverse transformation on the PET image and the CT image which are subject to fusion to generate a fused image. The invention has the advantages that rectification is carried out on the acquired PET image and the acquired CT image by an external label point-based method, and a variation method is innovatively proposed to be applied to a wavelet region, thus realizing the accurate fusion of PET and CT cross-modality medical image; and the method is simple in operation and accurate in results, and has important application value and economic benefits in clinical applications.

Description

technical field [0001] The invention relates to an image fusion method, in particular to a different-machine fusion method of PET images and CT images. Background technique [0002] Radiation therapy technology has gone through several stages of development: general radiotherapy, stereotactic radiosurgery (SRS), three-dimensional conformal radiation therapy (3DCRT), intensity-modulated radiation therapy (IMRT) and image-guided radiation therapy (IGRT). In the era of precise radiotherapy, precise radiotherapy can minimize the irradiation of normal tissues around the tumor, greatly increase the irradiation dose of the tumor, and improve the local control rate of the tumor. [0003] Tumor radiation therapy is a major field of medical image fusion applications, and accurate target delineation is the basis for accurate treatment. With the development of molecular imaging, PET, that is, positron emission tomography, can display the biological characteristics of tumors, and is inc...

AI Technical Summary

Problems solved by technology

There are many problems in the actual clinical application of the integration of the same machine: First, the fixed cost of the all-in-one machine is large, the cost recovery is difficult, and there is a serious waste of resources, and due to the economic situation and consumption level, it is limited to the nationwide equipment Insufficient and unbalanced quantity limit the clinical application and development of the same machine fusion. Simply put, the same machine equipment is very expensive. In comparison, the heterogeneous fusion is cheap and has a broad space for clinical application. ;Secondly, because the clinical needs are usually more complicated, it is impossible to combine all the required machines. If two images of the same mode are registered for the same patient at different times to measure the curative effect, software has to be used for registration. Fusion, it can be seen that software registration fusion, that is, fusion of different machines, is very necessary

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