Flat-panel CT machine

Abstract

The invention provides a flat-panel CT machine, which comprises a ray emitter and a flat-panel detector and adopts 360-degree scanning or 180-degree scanning. The length and width of a flat-panel detector are larger than those of a DSA flat-panel detector, the flat-panel detector can cover a single part of a human body, and spiral scanning is not needed any more. The scanning time is greatly shortened, and motion artifacts can be effectively reduced; the irradiation dose of a patient is greatly reduced; the spatial resolution and the number of longitudinal scanning layers are greatly improved,and gapless scanning is achieved. An X-ray emission pulse control technology is adopted, so that data obtained by the CT machine is complete and free of loss, and images are clearer. The scanning frequency is reduced by half through a pulse control technology or a 180-degree scanning mode; the requirement on the mobility of a thin film transistor of the detector can be reduced by about 10 times by a pulse control technology; the frequency is further reduced by redesigning the array element number of the detector, and the inversion frequency of a ray emitter is controlled within an achievablerange, so that the CT machine has the possibility of practical application.

Description

technical field

[0001] The invention relates to the technical field of CT equipment, in particular to a flat-panel CT machine. Background technique

[0002] CT (Computed Tomography), that is, computerized tomography. The basic principle of existing CT imaging is to use X-ray beams to scan a layer of a certain thickness of the human body inspection site. The X-rays that pass through this layer are received by the detector and converted into visible light. The analog / digital converter (analog / digital converter) converts the digital signal into a computer for processing. The processing of image formation is like dividing the selected layer into several cuboids with the same volume, which are called voxels. The scanned information is calculated to obtain the X-ray attenuation coefficient or absorption coefficient of each voxel, and then arranged into a matrix, that is, a digital matrix. Numerical matrices can be stored on disk or CD. Through the digital / analog converter, eac...

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