CN-122016883-A - CBCT device based on general image sensor

Abstract

The invention discloses a CBCT device based on a general image sensor, which comprises a main control computer, a bracket, a rotary suspension arm, a cone beam X-ray source and an imaging part. The imaging part consists of a scintillator, a plane reflecting mirror and a zoom camera. The cone beam X-rays pass through the measured body and irradiate the scintillator, and the scintillator converts an energy signal carried by the X-rays into a visible light signal. The visible light signal is reflected by the plane reflecting mirror, the light path is deflected by 90 degrees, and the visible light signal is imaged on an image sensor of the zoom camera through the lens. The proposed CBCT apparatus uses a general-purpose image sensor with higher resolution, lower noise level, and lower cost than the existing flat panel detector. In addition, the circuit part of the imaging part greatly prolongs the service life by avoiding being irradiated by X-rays. In addition, the field of view scope of the camera on the scintillator can be changed by changing the focal length, and meanwhile, the spatial resolution capability of the CBCT device is changed, so that the configuration flexibility of the CBCT device can be greatly improved.

Inventors

• GU YUZHANG
• YANG YANG
• RAN PENG
• WANG DAHE

Assignees

• 浙江大学嘉兴研究院

Dates

Publication Date

20260512

Application Date

20260129

Claims (8)

1. 1. A CBCT apparatus based on a general image sensor, comprising: a support for mounting the rotating motor and supporting the imaging section and the cone-beam X-ray source; the rotating motor is used for driving the suspension arm to rotate; The suspension arm is used for installing a cone beam X-ray source and an imaging part; The cone beam X-ray source is used for emitting cone beam X-rays; An imaging part for receiving and imaging the cone beam X-rays; the scintillator is used for converting an energy signal carried by the X-rays into a visible light signal; The plane reflector is used for reflecting visible light signals emitted by the scintillator to the zoom camera; the zoom camera is used for receiving and recording the scintillator visible light signal reflected by the plane reflector and carrying a general image sensor; The main control computer is used for controlling the rotating motor, the cone beam X-ray source and the zoom camera; The imaging part and the cone beam X-ray source are respectively and fixedly arranged on the suspension arm, the main control computer is respectively connected with the rotating motor, the cone beam X-ray source and the camera through cables, the imaging part comprises a cuboid hollow cavity structure, a scintillator arranged at the side wall of the cuboid hollow cavity structure and corresponding to the cone beam X-ray source, a plane reflector arranged in the cuboid hollow cavity structure and behind the scintillator, and a zoom camera arranged above the plane reflector and in the cuboid hollow cavity structure, the central axis of cone beam X-rays emitted by the cone beam X-ray source is vertically incident to the center of the scintillator, and the irradiation range of the cone beam X-rays covers the whole scintillator.
2. 2. The CBCT device based on a general purpose image sensor as in claim 1, wherein the zoom camera is located outside the cone beam X-ray irradiation range.
3. 3. The CBCT device based on a common image sensor as claimed in claim 1 or 2, wherein an optical axis of the zoom camera is perpendicular to a central axis of the cone beam X-ray and intersects a center of the plane mirror.
4. 4. A CBCT apparatus based on a general image sensor according to claim 3, wherein the optical axis of the zoom camera is in 45 ° angle of incidence with the plane mirror, and the central axis of the cone beam X-ray is in 45 ° angle of incidence with the plane mirror.
5. 5. The CBCT device based on a general image sensor of claim 4, wherein the zoom camera focuses on a virtual image plane of the scintillator plane after being reflected by the plane mirror.
6. 6. The CBCT device based on a common image sensor as claimed in claim 1,2,4 or 5, wherein the zoom camera changes its field of view on the scintillator by changing the focal length, thereby changing its spatial resolution on the scintillator.
7. 7. The CBCT device based on a common image sensor of claim 6, wherein the zoom camera is calibrated once for each preset focal length of the zoom camera for determining a scintillator size corresponding to a single pixel and for eliminating imaging distortion of a zoom camera lens.
8. 8. The CBCT device based on a general image sensor of claim 7, wherein the scintillator is easily detachable from an outside of the device.

Description

CBCT device based on general image sensor Technical Field The invention relates to the field of X-ray imaging, in particular to a CBCT device based on a general image sensor. Background The large-area-array X-ray flat panel detector for current commercial use has the problems of large pixel size, low spatial resolution capability, high cost and the like. For example, large area X-ray flat panel detectors commonly used in CBCT (Cone Beam Computed Tomography, cone-beam computed tomography) typically have pixel sizes greater than 100 microns, which are much larger than the pixel sizes of common image sensors, which are typically 2-5 microns. The size of the pixel size is a critical factor affecting the spatial resolution of the image. In addition to the pixel size, the photoelectric conversion efficiency and signal to noise ratio level of the flat panel detector and the image sensor are also key factors affecting the imaging quality. With rapid development of general image sensor technology and rapid improvement of manufacturing process in recent years, the performance of the image sensor in electronic circuits such as photoelectric conversion efficiency, signal to noise ratio level and the like is stronger, and part of the performance of the image sensor is far beyond that of a flat panel detector. Although the general image sensor is much smaller than the flat panel detector in terms of the area of a single pixel, the former has been enough to make up for the disadvantage of the smaller photosensitive area on a single pixel, and thus the X-ray imaging quality is improved as a whole, while the general image sensor has a more cost advantage than the large area array X-ray flat panel detector. Disclosure of Invention The invention provides a CBCT device based on a general image sensor, which replaces the existing large-area-array X-ray flat panel detector with the general image sensor. The invention is realized by the following technical scheme: The invention discloses a CBCT device based on a general image sensor, which comprises: a support for mounting the rotating motor and supporting the imaging section and the cone-beam X-ray source; the rotating motor is used for driving the suspension arm to rotate; The suspension arm is used for installing a cone beam X-ray source and an imaging part; The cone beam X-ray source is used for emitting cone beam X-rays; An imaging part for receiving and imaging the cone beam X-rays; the scintillator is used for converting an energy signal carried by the X-rays into a visible light signal; The plane reflector is used for reflecting visible light signals emitted by the scintillator to the zoom camera; the zoom camera is used for receiving and recording the scintillator visible light signal reflected by the plane reflector and carrying a general image sensor; The main control computer is used for controlling the rotating motor, the cone beam X-ray source and the zoom camera; The rotating motor is connected with the suspension arm, the imaging part and the cone beam X-ray source are respectively and fixedly arranged on the suspension arm, the main control computer is respectively connected with the rotating motor, the cone beam X-ray source and the camera through cables, the imaging part comprises a cuboid hollow cavity structure, a scintillator is arranged on the side wall of the cuboid hollow cavity structure and corresponds to the position of the cone beam X-ray source, a plane reflector is arranged in the cuboid hollow cavity structure and is arranged at the rear of the scintillator, a zoom camera is arranged above the plane reflector and is arranged in the cuboid hollow cavity structure, the central axis of cone beam X-rays emitted by the cone beam X-ray source is vertically incident to the center of the scintillator, and the irradiation range of the cone beam X-rays covers the whole scintillator. As a further improvement, the zoom camera of the present invention is located outside the cone beam X-ray irradiation range. As a further improvement, the optical axis of the zoom camera is perpendicular to the central axis of the cone beam X-ray and intersects with the center of the plane mirror. As a further improvement, the optical axis of the zoom camera of the invention has 45-degree incidence angle relation with the plane reflecting mirror, and the central axis of the cone beam X-ray has 45-degree incidence angle relation with the plane reflecting mirror. As a further improvement, the zoom camera of the present invention focuses on a virtual image plane in which the scintillator plane is reflected by the plane mirror. As a further improvement, the zoom camera of the present invention changes its field of view on the scintillator by changing the focal length, thereby changing its spatial resolution on the scintillator. As a further improvement, the zoom camera is calibrated once for each preset focal length of the zoom camera, so as to determine the scintillator size corresp