40 results about "Angio ct" patented technology

A method and apparatus for imaging a body by exposing the body to radiation transmitted through the body via successive angular portions from a radiation source on one side of the body to a radiation detector in alignment with the radiation source on the opposite side of the body; the radiation detector including a two-dimensional matrix of detector elements producing electrical outputs corresponding to the magnitudes of the radiation received by each detector element; the radiation source producing a conical beam sufficiently large such that each exposure covers all the detector elements in the two-dimensional array after traversing the body. Also described are a method and apparatus for producing angiographical images having an enhanced contrast-to-noise ratio (CNR) by subtracting, from each contrast image produced after injecting a contrast material, a masking image produced before injecting the contrast material, starting with the masking image determined to have a minimum change over its immediately preceding masking image in the respective sequence.

The invention provides a system for moving fluorescence dye carried by blood flow in visible cardiovascular bypass graft in operation. The system includes: a radiating device for providing radiation suitable for exciting fluorescent dye; a camera for capturing radiation emitted from fluorescent dye in blood vessel as angiography image; and the camera captures image with at least 15 frames per second speed; wherein, the fluorescent dye has absorption and emitting peak value in a rang of 800-850 nm; wherein, the camera can obtain a plurality of cardiovascular bypass graft images when hearts beating; wherein, the system is suitable for transforming image to visual image.

A method and system for extracting coronary vessels fluoroscopic image sequences using coronary digital subtraction angiography (DSA) are disclosed. A set of mask images of a coronary region is received, and a sequence of contrast images for the coronary region is received. For each contrast image, vessel regions are detected in the contrast image using learning-based vessel segment detection and a background region of the contrast image is determined based on the detected vessel regions. Background motion is estimated between one of the mask images and the background region of the contrast image by estimating a motion field between the mask image and the background image and performing covariance-based filtering over the estimated motion field. The mask image is then warped based on the estimated background motion to generate an estimated background layer. The estimated background layer is subtracted from the contrast image to extract a coronary vessel layer for the contrast image.

The invention discloses an imaging system of an endoscope.According to the system, one end of a first switch is connected with red laser and the other end of the first switch is connected with a first controllable decorrelation device to serve as a first channel; one end of a second switch is connected with a green light source and the other end of the second switch is connected with a first controllable decorrelation device to serve as a second channel; one end of a third switch is connected with a blue light source and the other end of the third switch is connected with a third controllable decorrelation device to serve as a third channel; the first channel, the second channel and the third channel are connected with a mixer, and mixed signal light is output; the first controllable decorrelation device in the first channel is not enabled, output signal light is used for laser speckle imaging, a laser speckle angiography image is generated, output signal light of the second channel and the third channel is used for narrow-band light imaging, and a narrow-band light image is generated.The imaging system of the endoscope breaks through narrow-band light imaging depth, detects the angiemphraxis condition, and improves the capacity of recognizing blood vessel depth information.