34results about How to "Reduce X-ray radiation" patented technology

The invention relates to a catheter device, with a position sensor system, for treatment of a partial or complete vessel blockage under image monitoring, with the catheter device featuring a treatment catheter of a vessel blockage, especially by removal or destruction of plaque and/or expansion of the vessel,, which is embodied as an integrated unit, especially as a combination catheter, with an OCT catheter and an IVUS catheter for image monitoring and with the position sensor system.

DPC (differential phase contrast) images are acquired for each photon energy channel, which are called spectral DPC images. The final DPC image can be computed by summing up these spectral DPC images or just computed using certain ‘color’ representation algorithms to enhance desired features. In addition, with quasi-monochromatic x-ray source, the required radiation dose is substantially reduced, while the image quality of DPC images remains acceptable.

The invention discloses an automatic exposure control method and an automatic exposure control device for an imaging device. The automatic exposure control method includes performing the exposure process twice, processing pre-exposed images, calculating image gray values of tissue areas of portions under test, taking specific value of the mean gray value to the recommended value as the essential foundation for calculating secondary exposure parameter (the mA value or exposure time value), and limiting the regulated image gray value range according to the maximum gray value and the minimum gray value so as to guarantee high-quality images acquired by the secondary exposure and reduce X-ray radiation to people under test. Since the exposure parameters are estimated according to the image gray value statistic which is much direct than the signal to noise ratio, various images can be processed effectively, and automatic exposure control accuracy is improved.

The invention discloses a perspective navigation method used for a C-arm type X-ray machine, which utilizes an adapter of an image intensifier and is matched with a C-arm for use. The perspective navigation method comprises the steps of initializing a navigation control system; carrying out perspective navigation puncture positioning; setting a crisscross positioning point set by an X-axis laser head and a Y-axis laser head through a positioning control system, sending information to a command controller and carrying out laser positioning frequency flicker display; carrying out the positioningby an integrated positioning tracking system; judging whether the puncture part of a patient generates displacement or not; amending the original set value according to the actual displacement value;constituting an integrated three-dimension imaging and CT path graph by using information emitted by the command controller and the actual displacement value; and using data of the actual displacement value and the three-dimensional imaging and CT path graph for forming a new coordinate, carrying out puncture according to the new coordinate of the actual displacement value and sending the information to a data acquisition device. The perspective navigation method minimizes the harm of an operation to human body, thereby having very high safety factor.

An x-ray computed tomography apparatus has a stationary device (3) for generating x-ray radiation from an x-ray focus that moves around the examination volume on a target that at least partially surrounds an examination volume of the apparatus in one plane. From the x-ray focus an x-ray beam is directed through the examination volume onto respective, momentarily opposite detector elements of a stationary x-ray detector that at least partially surrounds the examination volume. One or more shaping elements for influencing one or more beam parameters of the x-ray beam are arranged between the target and the detector elements. One or more of the shaping elements is/are arranged on a carrier frame that can rotate around a system axis in synchronization with the movement of the x-ray focus. The shaping elements rotating with the x-ray focus enable an optimal beam shaping and/or suppression of scatter radiation.

An economical X-ray apparatus that allows a rapid exposure of comparatively large-format digital X-ray images has an exposure unit, with which a predetermined surface segment of an exposure plane can be exposed with X-ray radiation, and a digital X-ray detector that is moved in the exposure plane, with the X-ray detector being continuously periodically driven.

The invention discloses an X ray human body fluoroscopy security check system capable of performing partial scanning, which comprises an X ray generator (10), an X ray detector (20), a collimator (30), a movable platform (40) and an imaging device (50), wherein the movable platform (40) is arranged between the collimator (30) and the detector (20) and does reciprocating motion; an optical shutter device (60) is arranged in an X ray passage of the collimator (30) and comprises an optical shutter core (61) for defining a scanning region, a bearing (62) for supporting the optical shutter core, a motor (63) for driving the optical shutter core to rotate and a short shaft (64) for supporting and fixing the optical shutter core; and a plurality of X ray windows (65) corresponding to different parts of a human body are arranged at different positions on the optical shutter core (61), so that X ray irradiates the whole human body or a partial detection part of the human body through the X ray windows (65). According to the system, partial scanning can be performed aiming at a specific part of the human body, and the scanning coverage range can be adjusted, so that the radiation of X ray to the human body can be effectively reduced.

The invention discloses a control method and a control system for heart CT (computed tomography) and a CT machine. The method comprises the steps of determining the image scanning range of the heart; performing image data acquisition on each scanning segment in the image scanning range in a preset scanning viewing angle range in at least one heart quiescent period, wherein scanning viewing angles of image data in different heart quiescent periods corresponding to single scanning segment are not coincided and are equal to the preset scanning viewing angle range after being accumulated. By adopting the technical scheme disclosed by the invention, the image quality can be improved, and unnecessary X-ray radiation is reduced.

A computer-implemented method of processing 2D images of an asymmetrical object, includes:

• • a) generating a 3D surface reconstruction of the object from 2D images of the object obtained from different perspectives;
  • b) generating data specifying a point of interest in at least one 2D image used to generate the 3D surface reconstruction;
  • c) generating data specifying an area of interest in the object, wherein the specified point of interest lies within the specified area of interest;
  • d) identifying a plane containing view directions with reduced foreshortening for the specified area of interest;
  • e) determining a 3D point corresponding to the specified point of interest on the 3D reconstruction of the object; and
  • f) generating data representing at least one particular view direction corresponding to the 3D point and contained with the identified plane.

A corresponding apparatus and computer program are also disclosed.

The invention relates to an apparatus and a system for visualizing an image object relating to an instrument (3), partitularly a medical instrument, in an extracorporeal image. The image object may comprise a representation of the instrument (3) or an intracorporeal image (40) acquired using the instrument (3). The system comprises an extracorporeal image acquisition device (1) for acquiring extracorporeal images with respect to an extracorporeal image frame and a tracking arrangement (2) for tracking the instrument (3) independent of the extracorporeal images with respect to a tracking frame. Further, the invention relates to a method carried out in the system.

The invention relates to a surgical navigation method and system, in particular to a method and a system for realizing surgical navigation by using a real-time structured light technology. According to the method, real-time structured light is used for scanning a structured light coverage area of an operation area in real time to obtain three-dimensional point cloud data, and then registration is carried out through unmarked registration and preoperative images; meanwhile, the surgical instrument in the space is recognized through structured light, then the surgical instrument in the space is positioned, real-time 3D point cloud reconstruction and preoperative image superposition are synchronously carried out, and finally the purpose of precise navigation surgery is achieved. The invention further provides the system for implementing the method. The system comprises a DICOM module, a preoperative planning module, a three-dimensional scanning module, an unmarked registration module, a display module, a computer aided design (CAD) module and a computer vision enhancement module. According to the method and the system, the space relation between the focus and the operation instrument can be directly obtained, one-time space conversion is reduced, errors are reduced, and accurate positioning is achieved.

A master-slave same structure teleoperation fracture reduction mechanism includes a frame assembly, two parallel platform assemblies, a top platform connecting plate (9), an operating handle assembly, two fixing assemblies, a controller (15), six movement assemblies and 24 hydraulic pipes (26). The operating handle assembly is located in the middle of the upper platform (5), and the two fixing assemblies are located on the top of the parallel platform assembly. The two parallel platform assemblies are disposed on the frame assembly; the controller (15) and the six movement assemblies are disposed on the frame assembly; A top platform connecting plate (9) is connected to the fixing assembly parallel platform assembly. The hydraulic pipes (26) is in communication with motion hydraulic cylinders (7a) and the other end of the hydraulic pipes is in communication with one of platform hydraulic cylinders (7b). The invention assists a doctor to achieve fracture reduction.

A system is suggested comprising an optical sensing means and a processing unit. The optical sensing means may include an optical guide with a distal end, wherein the optical guide may be configured to be arranged in a device to be inserted into tissue in a region of interest. The processing unit may be configured to receive information of a region of interest including different tissue types as well as of a path through the tissues, to determine a sequence of tissue types along the path, to determine a tissue type at the distal end of the optical guide based on information received from the optical sensing means, to compare the determined tissue type with the tissue types on the path, to determine possible positions of the distal end of the optical guide on the path based on the comparison of tissue types, and to generate a signal indicative for the possible positions.

The invention discloses a bone age tester capable of scattering low-dose X-rays, which comprises a tester rack, an X image generator, a control module, a scanning module, a driving module, a detectionmodel, and a marking device, the X image generator is arranged on the tester rack and connected to the scanning module, the control module is connected to the X image generator, the driving module and the detection module, the marking device is arranged on a detected human tissue, the detection module is arranged on the X image generator, and the detection module is used for identifying the marking device. According to the bone age tester disclosed by the invention, as the detection module moves along with the scanning module, linear X-ray scanning is formed; moreover, only after the markingdevice is detected by the detection module can signals being fed back to the control module, the control module makes a judgment, if the detected human tissue is already completely scanned, then the scanning module makes a returning movement, returning to the initial position, consequently, the dose of X-rays is reduced, and X-ray radiation is decreased.