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Computer measurement and representation of the heart in two and three dimensionsMethods for the measurement and display by minicomputer of cardiac images obtained from fluoroscopy to permit an accurate assessment of functional changes are discussed. Heart contours and discrete points can be digitized automatically or manually, with the recorded image in a video, cine, or print format. As each frame is digitized it is assigned a code name identifying the data source, experiment, run, view, and frame, and the images are filed for future reference in any sequence. Two views taken at the same point in the heart cycle are used to compute the spatial position of the ventricle apex and the midpoint of the aortic valve. The remainder of the points on the chamber border are corrected for the linear distortion of the X-rays by projection to a plane containing the chord between the apex and the aortic valve center and oriented so that lines perpendicular to the chord are parallel to the image intensifier face. The image of the chamber surface is obtained by generating circular cross sections with diameters perpendicular to the major chord. The transformed two- and three-dimensional imagery can be displayed in either static or animated form using a graphics terminal.
Document ID
19760050482
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Rasmussen, D.
(NASA Ames Research Center Moffett Field, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Man/System Technology And Life Support
Meeting Information
Meeting: Conference on Cardiovascular Imaging and Image Processing: Theory and Practice-1975
Location: Stanford, CA
Start Date: July 10, 1975
End Date: July 12, 1975
Sponsors: Stanford Univ. and NASA
Accession Number
76A33448
Distribution Limits
Public
Copyright
Other

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