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Image reconstruction method, reconstruction device and storage medium of compact CT detector

An image reconstruction and detector technology, applied in the field of medical imaging, to achieve the effect of suppressing artifacts, reducing volume and quality

Active Publication Date: 2022-06-24
NANJING ANKE MEDICAL TECH CO LTD
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Problems solved by technology

[0004] The traditional 3D filtered back-projection reconstruction method first weights and filters the projection data, and then reweights the back-projection. Generally, it is only suitable for the mode where the detector modules are arranged along the arc with the focus of the tube as the center. It is directly used for such as image 3 The compact detectors shown or other compact configurations will produce noticeable artifacts

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  • Image reconstruction method, reconstruction device and storage medium of compact CT detector
  • Image reconstruction method, reconstruction device and storage medium of compact CT detector
  • Image reconstruction method, reconstruction device and storage medium of compact CT detector

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Embodiment Construction

[0057] like figure 1 As shown, the mobile CT system scans the patient through an autonomously moving gantry. Mobile CT systems usually use stepped circular scanning or helical scanning. Step-by-step circular scanning, that is, the gantry scans a circle, and then the gantry moves as a whole by a distance covered by the detector, usually between 2-4cm. In the helical scanning mode, that is, during the rotation of the gantry, the gantry also moves along the direction of the patient bed. The movement or translation of the frame can be realized by the guide rails fixed on the frame, or the driving wheels of the wheels of the frame itself.

[0058] The geometry of a CT scan is as figure 2 As shown, the X-ray source and the detector P are opposite to each other, and rotate around the object f along a certain orbit, which can generally be a spiral or circular scanning orbit. is the projection angle, k is the cone angle, during the scanning process, at each angle X-rays pass t...

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Abstract

The invention discloses a compact CT detector image reconstruction method, a reconstruction device and a storage medium. The method comprises the steps of: using a compact detector to perform circular scanning or helical scanning on an object to be detected on a hospital bed to obtain initial projection data; Data rearrangement rearranges the initial projection data into traditional detector sampling; weights the rearranged projection data; filters the weighted projection data after weighting processing; performs weighted back projection on the filtered projection data to obtain reconstruction image. The present invention rearranges the initial projection data into traditional detector samples through data rearrangement, changes the pre-weighted and weighted back-projection weights of the original filtered back-projection reconstruction algorithm, and effectively suppresses pseudo to improve the quality of the reconstructed image. The invention is helpful for reducing the volume of the CT mobile system and promoting the application of compact detectors in clinical departments and intensive care units.

Description

technical field [0001] The invention relates to the technical field of medical imaging, in particular to a compact CT detector image reconstruction method, reconstruction device and storage medium. Background technique [0002] The traditional fixed CT system has a large volume, and is generally placed in a specific CT room and fixed on the ground, which brings great restrictions on the use of the CT system. If a critically ill patient is sent to the CT room for scanning, it is very dangerous, because when transferring the patient to the CT room, it is necessary to suspend the use of various important physiological monitoring and some rescue equipment, which may lead to complications or aggravate the patient's condition; but If CT scan is not performed in time, there is a risk of delay in diagnosis. Mobile CT systems have been introduced in recent years, and the entire CT system can move autonomously, which is especially suitable for use in intensive care units. The mobile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/00
CPCA61B6/52
Inventor 冯亚崇曾凯吴小页
Owner NANJING ANKE MEDICAL TECH CO LTD
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