505 results about "Fluoroscopic image" patented technology

The present invention comprises a compact optical see-through head-mounted display capable of combining, a see-through image path with a virtual image path such that the opaqueness of the see-through image path can be modulated and the virtual image occludes parts of the see-through image and vice versa.

An image guided navigation system comprises a memory, a locator, a processor and a display. The memory stores a plurality of CT images and a software program. The locator is capable of indicating a direction to a surgical area, and the indicated direction of the locator is defined as a first direction. The processor is electrically connected to the memory and the locator. At least one corresponding image corresponding to the first direction is obtained from the plurality of CT images by the processor executing the software program. The at least one corresponding image comprises at least one simulated fluoroscopic image. The display is capable of showing the at least one corresponding image.

A robot-guided system to assist orthopaedic surgeons in performing orthopaedic surgical procedures on pre-positioned inserts, including for the fixation of bone fractures, and especially for use in long bone distal intramedullary locking procedures. The system provides a mechanical guide for drilling the holes for distal screws in intramedullary nailing surgery. The drill guide is automatically positioned by the robot relative to the distal locking nail holes, using data derived from only a small number of X-ray fluoroscopic images. The system allows the performance of the locking procedure without trial and error, thus enabling the procedure to be successfully performed by less experienced surgeons, reduces exposure of patient and operating room personnel to radiation, shortens the intra-operative time, and thus reduces post-operative complications.

A method and system for co-registration of angiography data and intra vascular ultrasound (IVUS) data is disclosed. A vessel branch is detected in an angiogram image. A sequence of IVUS images is received from an IVUS transducer while the IVUS transducer is being pulled back through the vessel branch. A fluoroscopic image sequence is received while the IVUS transducer is being pulled back through the vessel branch. The IVUS transducer and a guiding catheter tip are detected in each frame of the fluoroscopic image sequence. The IVUS transducer detected in each frame of the fluoroscopic image sequence is mapped to a respective location in the detected vessel branch of the angiogram image. Each of the IVUS images is registered to a respective location in the detected vessel branch of the angiogram image based on the mapped location of the IVUS transducer detected in a corresponding frame of the fluoroscopic image sequence.

A method for guiding stent deployment during an endovascular procedure includes providing a virtual stent model of a real stent that specifies a length, diameter, shape, and placement of the real stent. The method further includes projecting the virtual stent model onto a 2-dimensional (2D) DSA image of a target lesion, manipulating a stent deployment mechanism to navigate the stent to the target lesion while simultaneously acquiring real-time 2D fluoroscopic images of the stent navigation, and overlaying each fluoroscopic image on the 2D DSA image having the projected virtual stent model image, where the 2D fluoroscopic images are acquired from a C-arm mounted X-ray apparatus, and updating the projection of the virtual stent model onto the fluoroscopic images whenever a new fluoroscopic image is acquired or whenever the C-arm is moved, where the stent is aligned with the virtual stent model by aligning stent end markers with virtual end markers.

A robotic system for steering a flexible needle during insertion into soft-tissue using imaging to determine the needle position. The control system calculates a needle tip trajectory that hits the desired target while avoiding potentially dangerous obstacles en route. Using an inverse kinematics algorithm, the maneuvers required of the needle base to cause the tip to follow this trajectory are calculated, such that the robot can perform controlled needle insertion. The insertion of a flexible needle into a deformable tissue is modeled as a linear beam supported by virtual springs, where the stiffness coefficients of the springs varies along the needle. The forward and inverse kinematics of the needle are solved analytically, enabling both path planning and correction in real-time. The needle shape is detected by image processing performed on fluoroscopic images. The stiffness properties of the tissue are calculated from the measured shape of the needle.

In a method and apparatus for the automatic merging of 2D fluoroscopic C-arm images with preoperative 3D images with a one-time use of navigation markers, markers in a marker-containing preoperative 3D image are registered relative to a navigation system, a tool plate fixed on the C-arm system is registered in a reference position relative to the navigation system, a 2D C-arm image (2D fluoroscopic image) that contains the image of at least a medical instrument is obtained in an arbitrary C-arm position, a projection matrix for a 2D-3D merge is determined on the basis of the tool plate and the reference position relative to the navigation system, and the 2D fluoroscopic image is superimposed with the 3D image on the basis of the projection matrix.

An apparatus and method for medical practitioners to detect the presence of abnormal cells including cancerous and pre-cancerous cells by using a transport capsule containing an imaging apparatus including UV sources and fluorescence detectors for obtaining images and fluorescence data of biological cells and tissue. The method includes the steps of scanning biological tissue using an ultra-violet (UV) source to obtain fluorescence data, transferring fluorescence data and/or images using a radio frequency (RF) or other suitable means to a personal computer (PC) system, analyzing the image and/or fluorescence data in the PC, identifying -tissues with precancerous and cancerous cells, and optionally determining their precise location, and assessing the accuracy of the calculated fluoroscopic images.

Certain embodiments of the present invention provide a method and system for improved registration of image and navigation references used in image-guided operations. Certain embodiments of the system include an image acquisition device for obtaining at least one image of an object, a first calibration fixture positioned in relation to the image acquisition device, and a second calibration fixture positioned in relation to the object. The position data from first calibration fixture is used to form a characterization of the image acquisition device, which is corrected by position data from the second calibration fixture. In an embodiment, a first calibration fixture is affixed to a C-arm camera and a smaller second calibration fixture is affixed to a patient. Data from the first and second calibration fixtures is used with tracking data to calibrate the image acquisition data and register reference points in image and navigation reference frames.

A system and method to image an imaged subject is provided. The system comprises an ultrasound imaging system including an imaging probe operable to move internally and acquire ultrasound image data of the imaged subject, a fluoroscopic imaging system operable to acquire fluoroscopic image data of the imaged subject during image acquisition by the ultrasound imaging system, and a controller in communication with the ultrasound imaging system and the fluoroscopic imaging system. A display can be illustrative of the ultrasound image data acquired with the imaging probe in combination with a fluoroscopic imaging data acquired by the fluoroscopic imaging system.

A method for 3D reconstruction of the positions of a catheter as it is moved within a region of the human body, comprising: (a) ascertaining the 3D position of a point on a catheter for insertion in the body region; (b) acquiring a fixed angle, single-plane fluoroscopic image of the body region and of the catheter; (c) transferring the image data and catheter-point position to a computer; (d) determining the 2D image coordinates of the point on the catheter; (e) changing the length of catheter insertion by a measured amount; (f) thereafter acquiring a further single-plane fluoroscopic image of the body region and the catheter from the same angle, transferring the length change and additional image data to the computer, and determining the 2D image coordinates of the point on the catheter; (g) computing the 3D position of the catheter point; and (h) repeating steps e-g plural times. A 3D model is constructed by assembling the plural 3D positions of the point within the body region into a 3D model of the region.

A method for non-rigid registration of digital 3D coronary artery models with 2D fluoroscopic images during a cardiac intervention includes providing a digitized 3D centerline representation of a coronary artery tree that comprises a set of S segments composed of Q_S 3D control points, globally aligning the 3D centerline to at least two 2D fluoroscopic images, and non-rigidly registering the 3D centerline to the at least two 2D fluoroscopic images by minimizing an energy functional that includes a summation of square differences between reconstructed centerline points and registered centerline points, a summation of squared 3D registration vectors, a summation of squared derivative 3D registration vectors, and a myocardial branch energy. The non-rigid registration of the 3D centerline is represented as a set of 3D translation vectors r_s,q that are applied to corresponding centerline points x_s,q in a coordinate system of the 3D centerline.

A CT scanner for scanning a subject is provided, the scanner comprising: a gantry capable of rotating about a scanned subject; at least two cone beam X-Ray sources displaced from each other mounted on said gantry; at least one 2D detector array mounted on said gantry, said detector is capable of receiving radiation emitted by said at least two X-Ray sources and attenuated by the subject to be scanned; a first image processor capable of generating and displaying CT images of a volume within the subject; a second image processor capable of generating projection X-Ray images of said volume, wherein the images are responsive to X-Ray separately emitted by each of said at least two cone beam X-Ray sources; and a third image processor capable of generating and displaying fluoroscopic images composed of said projection X-Ray images, wherein said fluoroscopic images are spatially registered to said CT images.

A method and system for constructing from volumetric CT or MRI scan data of a patient region, a virtual two-dimensional fluoroscopic image of the patient region as seen from a selected point in space are disclosed. In practicing the method, a plurality of rays are constructed between a selected view point and each of a plurality of points in an XY array, where at least some of the rays pass through the patient target region, the points in the XY array correspond to the XY array of pixels in a display screen, and each pixel in the display screen includes multiple N-bit registers for receiving digital-scale values for each of multiple colors. For each pixel element, a sum of all M-bit density values associated with voxels along a ray extending from the selected point to the associated pixel element is calculated. The summing is carried out by distributing the M bits in the voxel density values among the multiple N-bit registers of that pixel, such that such that one or more bit positions of each M-bit value is assigned to a selected register. The image constructed of gray-scale values representing the summed M-bit density values at each pixel in the screen is displayed to the user.

An apparatus and method for detecting, tracking and registering a device (218) within a tubular organ (210) of a subject. The devices include guide wire (216) tip or therapeutic devices, and the detection and tracking uses fluoroscopic images taken prior to or during a catheterization operation. The devices are fused with images or projections of models depicting tile tubular organs. Tile method and apparatus are used for treating chronic total occlusion or near total occlusion situations, by navigating a driller along the tubular organ (210) proximally to the occlusion point, in areas which are-not viewable in an angiogram, and optionally enabling the penetration of the occlusion in a preferred area.

Various improved catheter marking arrangements are described. In a first aspect of the invention, a first longitudinally extending radiopaque marker is positioned on the catheter. A second longitudinally extending radiopaque marker is positioned opposite the first marker at a rotational orientation that is approximately 180 degrees offset from the first marker. The second marker has a length that is sufficiently different from the first marker such that a surgeon utilizing the catheter in a surgical procedure would be able to readily differentiate the first and second markers in a fluoroscopic image based on their respective lengths in order to determine the rotational orientation of the catheter.

In some embodiments, the catheter includes a lumen that has a side port that opens to a side of the catheter. The first marker is composed of a pair of axially aligned marker segments located on opposite ends of the side port. The length of the first longitudinal extending marker defined as an end-to-end length of the pair of axially aligned marker segments is longer than the length of the second marker. The markers may be formed from any suitable materials that can be clearly detected by an imaging system.