Use of spline interpolation for border definition from two-dimensional echocardiograms: comparison to manual method

Update Item Information
Title Use of spline interpolation for border definition from two-dimensional echocardiograms: comparison to manual method
Publication Type thesis
School or College School of Medicine
Department Biomedical Informatics
Author Ryser, Antoinette Fay
Date 1985-06
Description A semiautomatic method for definition of cardiac chamber borders from two-dimensional echocardiograms has been developed which incorporates spline interplation to produce a smooth cure with moderate operator involvement. This research compares the semiautomatic border definition (SBD) method to the currently used manual border definition (MBD) method according to the following criteria: time requiarements, storage requirements, reproducibility, and accuracy. A paired t-test showed the mean contour generation time over multiple observers, patients, trials and cardiac contours to be significantly greater for SBD than for MBD (p=0). The mean number of stored border points for SBD was 9 ± 3.84. Manual contours each required 64 stored border points to maintain contour integrity. Reproducibility of 6 cardiac contours was compared via a sign test analysis of variances of 64 radial or hemichordal lengths recorded from contours generated over multiple observers, trials and patients. SBD produced significantly more reproducible contours for the short axis view at the mitral valve level at end-diastole (p-0) and at end-systole (p=0) and for the apical four-chamber view at end-diastole (p=0). There was no significant difference in reproducibility between methods for the apical four-chamber view at end-systole (p=.136) and the apical two-chamber view at end-diastole (p=.784) Only the apical two-chamber view at end-systole proved to be significantly more reproducible using MBD (p=.046). Accuracy of methods was compared by generating contours from black-on-white phantom images for which the true border coordinates were known. A mean absolute radial difference was calculated from 64 radial measurements taken from each contour and a paired t-test comparing these values between methods showed SBD to be significantly more accurate then MBD (p=0). Time requirements for SBD are highly machine dependent and may be significantly reduced with upgraded hardware. Subjectively, SBD appears to be less tedious and less fatiguing for the operator. For these reasons and because it has been shown more accurate and equally reproducible or more reproducible contours than MBD, SBD appears to be the preferred method for two-dimensional echocardiographic contour generation.
Type Text
Publisher University of Utah
Subject Physiopathology; Cubic Spline
Subject MESH Electrocardiography; Heart; Heart Diseases
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Relation is Version of Digital reproduction of "Use of spline interpolation for border definition from two-dimensional echocardiograms: comparison to manual method." Spencer S. Eccles Health Sciences Library. Print version of "Use of spline interpolation for border definition from two-dimensional echocardiograms: comparison to manual method." available at J. Willard Marriott Library Special Collection RC 39.5 1985 R95.
Rights Management © Antoinette Fay Ryser.
Format application/pdf
Format Medium application/pdf
Format Extent 2,404,097 bytes
Identifier undthes,4631
Source Original: University of Utah Spencer S. Eccles Health Sciences Library (no longer available).
Funding/Fellowship Departmnet of Medical Biophysics and Computing, University of Utah Fellowship.
Master File Extent 2,404,140 bytes
ARK ark:/87278/s6x63pt4
Setname ir_etd
ID 191815
Reference URL https://collections.lib.utah.edu/ark:/87278/s6x63pt4
Back to Search Results