X-ray tomographic scanner

Abstract

An X-ray tomographic scanner comprises a ray source, a flat panel detector, a detection bed and a collection computer, wherein the ray source emits X-rays, the flat panel detector receives the X-rays, converts the X-rays into electric signals and is connected with the collection computer, and the detection bed supports a patient; a fixed support is arranged around the detection bed, a contact slip ring is arranged at the inner side of the fixed support, the ray source and the flat panel detector are fixedly arranged on the contact slip ring and arranged opposite with the same diameter and rotate synchronously, the contact slip ring rotates around the detection bed, and a movement detection device is arranged over the fixed support. Images collected by the ray source and the flat panel detector during rotation are two-dimensional projection, and the two-dimensional projection is reconstructed in a three-dimensional mode through the collecting computer to obtain three-dimensional images used for diagnosis of doctors. The use ratio of the X-rays is higher, the speed of collecting data is higher, and movement of the patient can be monitored at all times through the movement detection device.

Description

technical field [0001] The invention relates to the technical field of clinical medical equipment, in particular to a movable X-ray tomographic scanner with low radiation dose. Background technique [0002] Computed tomography (CT) is an important non-destructive testing technology, which can obtain two-dimensional or three-dimensional images of the internal and external structural features of objects by using X-ray projection data from multiple projection angles. With the advantages of non-destructive, high-precision, and three-dimensional visualization, it has been widely used in clinical medical imaging diagnosis, and the image provides an important basis for the diagnosis of patients' diseases. But now many hospitals need to make an appointment for CT examination, which cannot meet the needs of severe and acute patients, and is not conducive to the timely treatment of acute patients; as my country gradually enters an aging society, hospital resources will be more scarce ...

AI Technical Summary

Problems solved by technology

In the process of CT scanning, when data acquisition is required, the patient is absolutely still, but in fact, the patient will have voluntary or involuntary movement during the scan, which will destroy the consistency and integrity of the projection data. Once the data acquisition process Motion in the center will cause serious artifacts on the final CT image, and even affect the doctor's diagnosis

This problem is more likely to occur in cone-beam CT with longer data acquisition time

Usually, because the operator and the scanning patient are not in the same room, it is difficult to detect the motion in time during the scanning process. Often, it is judged whether the patient is moving according to the artifacts in the reconstructed image. Once the motion artifact makes the image difficult to diagnose, the patient will be re-scanned. This will result in an increased dose of X-ray radiation to the patient

[0004] In addition, the traditional CT projection data is a one-dimensional image, while the reconstructed image data is a two-dimensional image, and the final reconstructed three-dimensional image is formed by accumulating multiple consecutive two-dimensional slices, the metal artifacts of the image are serious, and Traditional CT scans with a fan-shaped beam of radiation, and the radiation dose of the radiation is relatively high

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