33 results about "Blood vessel visualization" patented technology

An image data subtraction system enhances visualization of vessels subject to movement using an imaging system. The imaging system acquires data representing first and second anatomical image sets comprising multiple temporally sequential individual mask (without contrast agent) and fill images (with contrast agent) of vessels respectively, during multiple heart cycles. An image data processor automatically identifies temporally corresponding pairs of images comprising a mask image and a contrast enhanced image and for the corresponding pairs, automatically determines a shift of a contrast enhanced image relative to a mask image to compensate for motion induced image mis-alignment. The image data processor automatically shifts a contrast enhanced image relative to a mask image in response to the determined shift. The image data processor subtracts data representing a mask image of a corresponding pair from a shifted contrast enhanced image of the corresponding pair, to provide multiple subtracted images showing enhanced visualization of vessels.

The invention discloses a three-dimensional blood vessel segmentation method based on a symmetric matching filter group and regional growth. Firstly, a basic matching filter template of a tubular structure with the satisfaction of a shape characteristic and a gray distribution characteristic of a three-dimensional blood vessel is designed, and two orthogonal planes are used to equally divide a basic matching filter into four quadrants. Then a matching filter group whose direction and scale can be changed is designed, the spatial convolution with a medical image to be enhanced is carried out, the obtainment of a maximum convolution response value is determined as a fusion rule, the blood vessel enhancement of a multi-scale and multi-direction matching filter group is realized, an enhanced image is obtained, and finally the regional growth is used to extract a three-dimensional blood vessel for the enhanced image. According to the method disclosed by the invention, a blood vessel visual effect can be effectively enhanced, the method has a good enhancement effect for a small branch peripheral blood vessel and a blood supply artery close to a lesion tumor especially, at the same time the to suppression of the limbic cortex and other impurities is obvious, thus the contrast of a vessel and a background significantly enhanced, and a solid base is laid for the extraction of a final vessel.

The invention relates to the technical field of thin optical lens assemblies in medical instruments, in particular to a high-contrast high-acutance medical miniature near-infrared blood vessel visualization lens, which comprises four optical lenses, a diaphragm and an infrared filter, wherein the four optical lenses are divided into three groups; the first group comprises two lenses and consists of a positive lens and a negative lens which are the first and second slices; the face type of the positive lens is convex on the front and convex on the back; the face type of the negative lens is convex on the front and concave on the back; the diaphragm is arranged between the positive lens and the negative lens; the second group is a positive lens which is concave on the front and convex on the back and is the third slice; the third group is a negative lens and is the fourth slice, the first face of the negative lens is a convex face, and the second face of the negative lens is a concave face; the four lenses are all aspherical; the infrared filter is arranged on one side of the third group of negative lens. On the premise of miniaturization, the contrast and the acutance of the lens can be improved to the maximum, edge parameters are limited, and the stability for processing and forming the lens is greatly improved.

The invention provides a hepatic vessel three-dimensional reconstruction and visualization method based on a vascular tubular model. The method comprises the steps of S10, obtaining a liver CT image,and adjusting the window width and window position, so as to enable the liver CT image to accord with the gray scale display range of display equipment; s20, performing preprocessing of denoising andimage enhancement on the liver CT image conforming to the gray level display range of the display device; s30, segmenting the blood vessel by using a segmentation method based on a Hessian matrix anda region growing algorithm according to the preprocessed blood vessel image; s40, filling a cavity caused by blood vessel segmentation by adopting a morphological method; s50, volume rendering is performed on the blood vessel by using a triangular mesh surface rendering and light projection algorithm according to inherent characteristics of the liver blood vessel so as to realize three-dimensionalreconstruction; and S60, visually displaying the three-phase image sequence by adopting a computer-aided liver blood vessel visualization system based on a CT dynamic enhanced image. According to themethod, segmentation and three-dimensional reconstruction are accurately and reliably carried out on the liver blood vessel, and visual display can be well carried out to assist a doctor in determining the liver condition.

A catheter device for providing visualization as well as support and/or stability for blood vessels during procedures for inserting electrical leads. The catheter device comprises a longitudinal member having a distal end and a proximal end, an expandable element near the distal end of the longitudinal member for providing support to the blood vessel, and a contrast release port near the distal end of the longitudinal member for releasing a contrast medium into the blood vessel to visualize the blood vessel.

The expandable element may comprise an inflatable balloon, or a plurality of compressible elements that expand to a balloon like shape, or a compressible coil housed in a protective sheath that retracts to allow the coil to expand. The catheter device comprises two inflatable balloons. At its proximal end, the catheter device comprises one or more inflation ports for inflating the one or more balloons.

To allow for visualization using a contrast agent, the catheter device further comprises a contrast injection port near its proximal end, and a contrast release port near its distal end.

A system for visualizing an anatomical target includes a scope (102) for internal imaging having a field of view less than a region to be imaged. A planning module (104) is configured to receive video from the scope such that field of view images of the scope are stitched together to generate a composite image of the region to be imaged. An image guidance module (016) is configured to move the scope along the anatomical target during a procedure such that an image generated in the field of view of the scope is displayed as live video overlaid on a field of the composite image.