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A Method of Improving Cone Beam Spectrum Imaging Resolution Using Eccentric Rotation

A high-resolution, eccentric rotation technology, applied in the field of medical image reconstruction, can solve problems affecting imaging quality, achieve the effect of improving resolution and overall imaging quality

Active Publication Date: 2021-11-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In SPECT, the key factor that limits the spatial resolution and sensitivity of the image is the size of the collimation aperture of the detector. Too large or too small a collimator aperture will affect the imaging quality.

Method used

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  • A Method of Improving Cone Beam Spectrum Imaging Resolution Using Eccentric Rotation
  • A Method of Improving Cone Beam Spectrum Imaging Resolution Using Eccentric Rotation
  • A Method of Improving Cone Beam Spectrum Imaging Resolution Using Eccentric Rotation

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Embodiment 1

[0073] While the detector is rotating around the object, at each rotation angle, the detector needs to perform an eccentric rotation operation to obtain several low-resolution projection images. In this example, the resolution of the low-resolution detector is 32×32 pixels, and the high-resolution pixels obtained by the target are 128×128, N=128, R=4, M=16 as an example, but it does not illustrate the The invention is limited only by these conditions, and the scope of the present invention is limited only by the appended claims.

[0074] This embodiment discloses a method for improving the resolution of cone beam SPECT imaging by utilizing eccentric rotation, and its specific implementation steps are as follows:

[0075] Step 1, obtain low-resolution projection images under 128 rotation angles, and obtain 16 low-resolution projection images under each rotation angle, and the collection of low-resolution projection images under each rotation angle must ensure the focus of the d...

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Abstract

The invention relates to a method for improving the resolution of cone beam SPECT imaging by using eccentric rotation, comprising the following steps: step 1, obtaining low-resolution projection images at N rotation angles, and obtaining several low-resolution images at each rotation angle Ratio projection image, the acquisition of the low-resolution projection image will ensure that the detector focus is always the same point, there is a geometric relationship between the low-resolution projection image and the high-resolution projection image under this rotation angle; Step 2, for Several low-resolution projection images under a single rotation angle are processed to obtain the corresponding high-resolution projection images under the rotation angle; step 3, repeat step 2 to obtain high-resolution projection images under N rotation angles, and finally obtain the real High resolution images. The invention can improve the resolution of the cone-beam SPECT image without changing the hardware of the detector.

Description

technical field [0001] The invention relates to a SPECT imaging mode, in particular to a method for improving the resolution of cone-beam SPECT imaging by utilizing eccentric rotation, and belongs to the field of medical image reconstruction. Background technique [0002] Single photon emission computed tomography (SPECT) is an important technology in nuclear medicine imaging. Radioactive tracers radiate gamma photons, which are detected by detectors after passing through the human body, and the tomographic images are finally reconstructed. It is widely used in the fields of tumor diagnosis, cardiovascular disease diagnosis and brain neuroscience research. Compared with other medical imaging modalities such as X-ray computed tomography (CT) and magnetic resonance imaging (MRI), SPECT has the limitation of lower resolution. In SPECT, the key factor that limits the image spatial resolution and sensitivity is the size of the collimation aperture of the detector. Too large or t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T3/60G16H30/40A61B6/03
CPCG06T3/60G16H30/40A61B6/037A61B6/52G06T2207/10108G06T5/90
Inventor 温俊海程志彪雷丙震
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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