High-speed helical scanning CT machinewith large coverage area

Abstract

The invention discloses a high-speed helical scanning CT machinewith a large coverage area, which comprises a rotating frame.A bulb tube and a detecting device which are correspondingly arranged are mounted on therotating frame, a plurality of focal points are arranged on the bulb tube in the direction of a scanning channel, ray windowsin one-to-one correspondence with the focal points are arranged onthe lower surface of the bulb tube, the detecting device comprises a plurality of arc-shaped detector modules, and each arc segment of the detector modulesis in one-to-one correspondence with a focal point of the bulb tube, the corresponding focal point is taken as the arc center, the detector modulesare provided with collimating grids, and the rotating frame is provided with a high voltage generator and a control box which are used for controlling the exposure of each focal point of the bulb tube. According to the high-speed helical scanning CT machinewith thelarge coverage area, scanningwith the large coverage area can be realized by arrangingthe structureof the multifocal bulb tube and the multi-arc detector, the spiral scanning method and synchronous feeding of the rotating frameand a scanning bed are adopted to realize high-speed scanning, and the scanning efficiency is high.

Description

technical field [0001] The invention relates to the technical field of tomographic scanning medical equipment, and more specifically relates to a large-coverage high-speed helical scanning CT machine. Background technique [0002] As the coverage of the detector increases, the image quality deteriorates and brings cone beam artifacts. The current limit coverage is 160mm, and the effective coverage of the helical scan is only 80mm, which limits the rapid and large coverage of CT. In the existing 320-row and 256-row (512 flying focus) CT machine technology, the maximum detector coverage can only reach 160mm, and the 3D cone beam reconstruction algorithm is used to improve image quality and alleviate cone beam artifacts, but there are the following problems: 3D The cone-beam reconstruction algorithm cannot completely eliminate the cone-beam artifacts, and the image quality of the edge layer is worse than that of ordinary 64-row and 128-row CT images; 160mm coverage area cannot ...

AI Technical Summary

Problems solved by technology

[0002] As the coverage of the detector increases, the image quality deteriorates and brings cone beam artifacts. The current limit coverage is 160mm, and the effective coverage of the helical scan is only 80mm, which limits the rapid and large coverage of CT.

In the existing 320-row and 256-row (512 flying focus) CT machine technology, the maximum detector coverage can only reach 160mm, and the 3D cone beam reconstruction algorithm is used to improve image quality and alleviate cone beam artifacts, but there are the following problems: 3D The cone beam reconstruction algorithm cannot completely eliminate the cone beam artifacts, and the image quality of the edge layer is worse than that of ordinary 64-row and 128-row CT images; 160mm coverage area cannot perform effective helical scanning, and the maximum can only have the middle 128 layers (80mm detector width ) can perform effective helical scanning, which limits the efficient large-coverage helical scanning; the detector range cannot continue to expand to a wider coverage area above 160mm

When examining a patient, a single rotation (0.24s) cannot cover all internal organs, and the patient needs to hold his breath during the scan, which is prone to motion artifacts; one scan cannot be multi-energy spectral imaging, and the benign and malignant lesions cannot be finely identified

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