Variable-focal-length cone beam CT device

Abstract

The invention discloses a variable-focal-length cone beam CT device. The variable-focal-length cone beam CT device comprises a detector, a substrate, a translation device, a ray source and a collimator, wherein the detector is arranged at an end A of the substrate, the ray source is arranged at an end B of the substrate through the translation device, and the collimator is fixedly arranged at a ray outlet of the ray source; the translation device is fixedly arranged at the bottom of the substrate and comprises a ray source mounting plate, a linear guide device and a linear driving device; and the ray source is fixedly arranged on the ray source mounting plate of the translation device, and the linear driving device can drive the ray source to do translation motion along the linear guide device. The variable-focal-length cone beam CT device is suitable for the technical field of dental X-ray imaging equipment, the detector with a large view field is adopted, the ray source can do linear motion relative to the detector through the translation device, and therefore on the premise that the device has functions of shooting CT, panorama and the like, images of the true lateral of the head are successfully shot at a time, the shooting time of a patient is shortened, the radiation time is shortened, and the imaging quality is improved.

Description

technical field [0001] The invention belongs to the technical field of dental X-ray imaging equipment, in particular to a cone-beam CT device with variable focal length. Background technique [0002] With the development of technology, cone beam CT (CBCT) has been widely used in the field of stomatology and has become one of the most commonly used diagnostic tools for dentists. Cone beam oral CT commonly used in the market is mainly divided into three-in-one oral CT and large field of view professional oral CT. [0003] These two devices can be used to shoot CT, panorama, front side of the head, etc. The three-in-one oral CT uses different detectors for shooting CT, panorama and front side of the head, mainly because the field of view of the main detector is relatively small. Small size, not enough to capture the front and side images of the whole head, so an auxiliary detector specially used to take the front and side images of the head is added, but because the auxiliary ...

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Problems solved by technology

Based on the advantages of its large field of view, professional oral CT with a large field of view, when it is necessary to take images of the front and side of the head, take the CT first, and reconstruct the required image through the algorithm (because the head and the radiation source are aligned with the front and side of the head when the CT is taken). The spacing requirements between different methods are different. If you shoot directly, the image distortion will be too large because the distance between the detector, the patient’s head and the radiation source is too small); but this method takes a long time and causes serious damage to the patient. Large radiation, poor image quality

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