35 results about "Spiral CT Scans" patented technology

Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether there are drugs concealed in the inspected liquid article based on the difference between the acquired physical attributes and reference physical attributes of the inspected liquid article. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

An apparatus and method for scanning an object with a helical CT scanner, the method comprising: acquiring an amount of data corresponding to the object that is scanned by the CT scanner, wherein the amount of data is generated by an x-ray source that projects a fan beam of x-rays toward a detector array on an opposite side of a gantry of the CT scanner, the fan beam being generated at multiple x-ray source positions as the x-ray source is rotated about the object as the object passes through an opening in the gantry disposed about a conveyor for moving the object through the opening; monitoring a position of the conveyor as the object passes through the opening in the gantry; determining if the conveyor has been stationary for more than one rotation of the gantry and discarding redundant data after one rotation, optionally turning off the x-ray tube if the conveyor has been stationary for more than one gantry rotation, and if so preventing the conveyor from moving again until the tube is turned on and is stable, inputting the position of the conveyor at each x-ray source position into a reconstruction algorithm; and presenting an image of the object.

Apparatus and methods for computed tomography (CT) imaging are provided. One method includes providing a patient table to move along an examination axis of a rotating gantry of a CT imaging system having at least one imaging detector. The imaging detector includes a pixelated detector array. The method further includes configuring the CT imaging system to perform an overlapping helical CT scan by controlling a speed of the moving patient table along the examination axis through a field of view (FOV) of the at least one imaging detector of the rotating gantry.

Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether the inspected liquid article is dangerous based on the physical attributes. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

The present invention relates to the field of computer-aided surgery technology and craniomaxillofacial repair and reconstruction surgery medical equipment, in particular to an intraoperative real-time navigation operation method for assisting removal of foreign bodies in the mandibular region, which is characterized by the following steps: preoperatively modulating dental self-curing gum to make mouth opening Fix the guide plate, and then wear the guide plate in the mouth to perform thin-slice spiral CT scanning of the patient’s maxillofacial area, import the CT data into the navigation software i‑plan for preoperative planning, accurately mark the position of foreign bodies and set the approach of clamping instruments; , wearing a mouth opening guide plate for maxillofacial surgery area surface registration and clamping instrument registration, and the navigation operation can be performed after the accuracy is verified to be qualified. After exposing the operation area, follow the planned path and trajectory, observe and adjust the path of the instrument tip in real time on the navigation display, and remove the foreign body. The invention realizes the navigation surgery technique in the movable area of ​​the mandible, the method is convenient, the additional cost is low, easy to learn and use, and the curative effect is stable.

The invention discloses a making method for a fracture model of artificial bone, which comprises the following steps: carrying out continuous spiral CT (computed tomography) scanning on affected bone along the cross section to obtain a multi-layer image, storing according to a Dicom 3.0 standard and making out a three-dimensional reconstruction model of the bone and a fractured section by utilizing Mimics software; fractioning the model to be processed by UG (Unigraphics) software and making an appearance mold of the bone and a mark groove for the position of a fracture line of the archetypal bone by numerically-controlled mill processing; and carrying out three-dimensional printing to obtain a fractured section model, also placing at the position of the mark groove of the corresponding bone appearance mold, jointing an upper mold and a lower mold, filling polymethyl methacrylate, standing at room temperature, solidifying and taking out the fractured section model so as to obtain a specimen of the fracture model of the artificial bone. In this way, the prepared fracture model is made in one step, and the complicated processes of obtaining a bone specimen and afterwards making fracture artificially, the consumption of equipment and the worry of enhancing the cost are omitted. The condition of stress between fractured sections is comprehensively and truly reflected by an obtained fracture interface, and the assistance is provided to the treatment of clinical fracture.

The invention provides a control method of spiral CT equipment. The spiral CT equipment comprises a rotary stand, a CT bulb tube, a detector and a collimator which are fixedly arranged on the rotary stand, and a scanning bed for supporting a scanned object. The method comprises the following steps: receiving sign data of the scanned object; making a first scanning plan in accordance with the sign data; conducting CT scanning on the scanned object in accordance with the first scanning plan so as to acquire first projection data; implementing examination by virtue of the first projection data in accordance with an image reconstruction examination rule; assessing a result of examination in accordance with special conditions, keeping the first scanning plan when an assessment result satisfies a special condition, otherwise generating a second scanning plan and continuing to conduct CT scanning on the scanned object in accordance with the second scanning plan when the assessment result fails to satisfy the special condition, and acquiring second projection data; and implementing image reconstruction in accordance with the first projection data and / or the second projection data.

The invention is a method for preparing an artificial femur specimen by using polymethyl methacrylate (PMMA), which is characterized in that the method carries out continuous spiral CT scan on normal femur by taking along the cross section of the femur, and obtained multilayer images are manufactured into a three-dimensional reconstruction model of the femur; and then a femur model is manufactured, unbleached wax is utilized to manufacture a pulp cavity, and PMMA is poured into the model to be cured; finally, the unbleached wax is melted to obtain the hollow femur specimen. In the invention, PMMA is utilized to manufacture the femur model, the cost is low, the operation is simple, the performance is good, and the model can be easily stored, thus avoiding the worries about inadequate bone source and high cost. In addition, experiments which can not be carried out on the body of a patient can be carried out in vitro, such as the selection of different internal fixtures of identical typefracture and the analysis on stress applied on different type fractures of the same internal fixture, thus the method finds out solutions and provides helps for the selection of internal fixation of clinical femur fracture.

The invention discloses a method and equipment for inspecting a liquid article by dual-energy helical computed tomography (CT). The method comprises the following steps of: emitting high-energy and low-energy X rays by a ray source; detecting and acquiring the high-energy and low-energy X rays penetrating at least one liquid article to be inspected; carrying the liquid article to be inspected to ensure it can rotate around an axis and can be lifted, so that the liquid article to be inspected enters a detection region, and the high-energy and low-energy X rays emitted by the ray source can penetrate the liquid article to be inspected; performing dual-energy helical CT scanning on the liquid article to be inspected to form a group of helical CT images, each of which represents at least one physical attribute value of the liquid article to be inspected; analyzing the group of helical CT images to determine a helical CT image part of the liquid; and judging whether the liquid article is a dangerous article based on the physical attribute values and reference physical attribute values of the liquid article. By the invention, the liquid article can be quickly inspected.

The invention discloses a method for detecting a liquid article by using a double-energy spiral CT (captive test) and a device. The device comprises a ray source, a detecting and collecting device, a load bearing mechanism, a controller and a computer, wherein the ray source is used for emitting high-energy and low-energy X rays; the detecting and collecting device is used for detecting and collecting the high-energy and low-energy X rays which penetrate through at least one detected liquid article; the load bearing mechanism can bear the detected liquid article to rotate around a shaft and can move up and down so that the detected liquid article enters a detection area, thereby leading the high-energy and low-energy X rays emitted by the ray source to penetrate through the tested liquid article; the controller controls the ray source and the detecting and collecting device to carry out double-energy spiral CT scanning on the detected liquid article so as to form a group of spiral CT images which respectively represent at least one physical attribute value of the detected liquid article; and the computer analyzes the group of spiral CT images so as to determine the spiral CT image part of liquid and judges whether the detected liquid article is suspicious based on the physical attribute value and the reference physical attribute value of the liquid article. The method can quickly detect the liquid article.

A method and system for dose-optimized acquisition of a computed tomography (CT) scan of a target organ is disclosed. A localizer spiral CT scan is started at a beginning of a confidence range before a target organ. Real-time localizer scan images are automatically analyzed to predict a beginning location of the target organ based on the real-time localizer scan images. A diagnostic spiral CT scan is automatically started at the predicted beginning location of the target organ. Real-time diagnostic scan images are automatically analyzed to predict an end location of the target organ where full coverage of the target organ will be reached. The diagnostic spiral CT scan is automatically stopped in response to reaching the predicted end location of the target organ. A 3D profile can be acquired using a 3D camera and used to determine the confidence range before the target organ.

The invention relates to a method for making a navigation template for assisting the placement of thoracic pedicle screws, using spiral CT to scan the thoracic spine to obtain a tomographic image of the thoracic spine in the area to be operated; importing the image data into software for three-dimensional reconstruction to obtain a three-dimensional model of the thoracic spine ; Place a virtual screw on the target thoracic pedicle, confirm that the screw is in the ideal position on the transverse, sagittal, and coronal planes, and further adjust it on the three-dimensional view to make it meet the actual requirements of the operation; generate a virtual screw around the virtual screw. Screw placement channel; extract the anatomical information of the bony structure behind the thoracic vertebrae to generate a navigation template base; combine the virtual nail placement channel with the navigation template base, and add an arc-shaped support structure around the spinous process on the navigation template base. Connecting rods are added between the structure and the virtual screw channel and between each virtual screw channel to generate a virtual navigation template; a rapid prototyping machine is used to manufacture a solid navigation template. The present invention can make an individualized navigation template, and the navigation template is placed behind the thoracic vertebrae of the corresponding segment, and can guide and accurately place the pedicle screw.