NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Real-time detection and data acquisition system for the left ventricular outlineThe paper describes the design and capabilities of a computer-interfaced angiocardiographic automated border recognizer for real-time detection and data acquisition regarding the left ventricular outline. The contour detection is based on a thresholding technique that uses an analog comparator to compare the video signal with a constant reference level, which can be used satisfactorily only if the brightness level is roughly constant along a ventricular border. The use of dynamic reference level is described for achieving a marked improvement by having the reference level dynamically adjusted according to local brightness levels on a line-to-line basis. Also discussed are the features of the computer interface designed and implemented for the real-time on-line storage of the obtained border coordinates. Results to date indicate that the system provides an accurate left ventricular contour even in pictures with relatively low contrast. Application of the threshold detection technique to echocardiography is briefly discussed.
Document ID
19770034509
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Reiber, J. H. C.
(NASA Ames Research Center Moffett Field, Calif.; Rotterdam, Erasmus Universiteit, Rotterdam, Netherlands; Stanford University, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1975
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
Accession Number
77A17361
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available