Automatic Remasking of Digital Subtraction Angiography Images in Pulmonary Angiography

MR Digital Subtraction Angiography

Analysis of Subtraction Methods in 3D Contrast-Enhanced MR Digital Subtraction Angiography Yuexi Huang Master of Science 2001 Department of Medical Biophysics University of Toronto 3D Contrast-enhanced MR angiography is promising as a replacement to catheter-based x-ray angiography due to its non-invasive nature. However, the image quality of MR angiography is still inferior to that of x-ray an...

Digital subtraction angiography.

Improvement of cervicocranial i.v. digital subtraction angiography with pixel remasking and cardiac gating.

A Philips DVI 2 apparatus* was used, and the technique has been described [8] . A total of 264 carotid bifurcations were studied retrospectively , 130 with and 134 without cardiac gating and postprocessing with pixel shift (Fig . 1 ). Only patients without renal failure or major cardiac disease were included. The ideal study of an area of interest consisted of two or more views with no movement...

Automatic registration of temporal image pairs for digital subtraction angiography

Temporal Digital Subtraction Angiography (DSA) is used to visualize blood vessels in x-ray images. A DSA image pair consists of the mask image, which is a digitized x-ray taken before a contrast medium is injected into the bloodstream, and the live image, which is taken once the contrast medium has traversed the circulatory system and reached the blood vessels of interest. The mask image is the...

Motion compensated digital subtraction angiography

Digital subtraction angiography, whether based on traditional X-ray or MR, su ers from patient motion artifacts. Until now, the usual remedy is to pixel shift by hand, or in some cases performing a global pixel shift semi-automatically. This is time consuming, and cannot handle rotations or local varying deformations over the image. We have developed a fully automatic algorithm that provides fo...