Abstract: A method for in-room computer reconstruction of a three-dimensional (3-D) coronary arterial tree from routine biplane angiograms acquired at arbitrary angles and without using calibration objects.

Abstract: A method and system for displaying medical images and computer output from various CAD schemes on the images. Images are loaded into the display system and displayed in a main viewing area. The system can display various CAD schemes, such as the automated detection of lung nodules, interstitial infiltrates, and heart size, in the case of a chest image, on the image. The method and system also display interval change (temporal subtraction) between images. Individual abnormality from CAD schemes can be viewed by clicking buttons with minified (postage stamp size) images with CAD annotation rendered into them. The images and results are then shown on a high-speed monitor. Interval change between the current and a previous image can also be chosen by clicking buttons containing minified images. Interval change between any other pair of images for a patient can be selected by choosing from minified subtraction images presented in a two-dimensional array format.

Abstract: A process of determining the three-dimensional location of a pacemaker lead in the heart of a subject is provided. The process includes the steps of acquiring a plurality of two-dimensional images of the lead; calculating the imaging geometry; identifying the two-dimensional position of the lead in each of the images; temporally interpolating the identified two-dimensional positions to identify a two-dimensional position of image at a single time; and calculating the three dimensional location of the lead from the two-dimensional position at that time.

Abstract: A method and system for quantitation of blood flow rates by using digital subtraction angiographic (DSA) images, wherein the spatial shift of the distribution of contrast material injected into an opacified vessel in the acquired angiographic images is analyzed as a bolus of the contrast material proceeds through the vessel. In order to determine the distance that the bolus travels between image acquisitions, there is obtained from the DSA images the distribution of vessel contrast along the length of the vessel, called and "distance-density" curve. The distance that the contrast material travels during the time between two images acquisitions is determined by means of cross correlation of the two respective distance-density curves. The flow rate between the image acquisitions is calculated by multiplying this distance by the frame rate and the vessel cross-sectional area which is estimated from the vessel size assuming a circular cross section.