Comparison of MPEG-1 digital videotape with digitized sVHS videotape for quantitative echocardiographic measurements.
Digital format is rapidly emerging as a preferred method for displaying and retrieving echocardiographic studies. The qualitative diagnostic accuracy of Moving Pictures Experts Group (MPEG-1) compressed digital echocardiographic studies has been previously reported. The goals of the present study were to compare quantitative measurements derived from MPEG-1 recordings with the super-VHS (sVHS) videotape clinical standard. Six reviewers performed blinded measurements from still-frame images selected from 20 echocardiographic studies that were simultaneously acquired in sVHS and MPEG-1 formats. Measurements were obtainable in 1401 (95%) of 1486 MPEG-1 variables compared with 1356 (91%) of 1486 sVHS variables (P <.001). Excellent agreement existed between MPEG-1 and sVHS 2-dimensional linear measurements (r = 0.97; MPEG-1 = 0.95[sVHS] + 1.1 mm; P <.001; Delta = 9% +/- 10%), 2-dimensional area measurements (r = 0.89), color jet areas (r = 0.87, p <.001), and Doppler velocities (r = 0.92, p <.001). Interobserver variability was similar for both sVHS and MPEG-1 readings. Our results indicate that quantitative off-line measurements from MPEG-1 digitized echocardiographic studies are feasible and comparable to those obtained from sVHS.
Garcia
M J
MJ
The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. garciam@ccf.org
Thomas
J D
JD
Greenberg
N
N
Sandelski
J
J
Herrera
C
C
Mudd
C
C
Wicks
J
J
Spencer
K
K
Neumann
A
A
Sankpal
B
B
Soble
J
J
D004452:Echocardiography; D006801:Humans; D007091:Image Processing, Computer-Assisted; D012815:Signal Processing, Computer-Assisted; D014743:Videotape Recording