The following table or figure may be downloaded to PowerPoint for personal use in teaching and presentations. This feature is available to all subscribers to the journal.
You MUST read and follow the guidelines at Request to Reproduce AJR Content if you are distributing or using AJR content beyond academic use (limited distribution, non-revenue producing, or educational purposes).
(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.
Fig. 1 —Flowchart shows methodologic approach followed by each
reviewer to evaluate interobserver variability in assessment of right
ventricular ejection fraction (RVEF) with MDCT. First step was to investigate
influence of operator technique on determination of reconstruction window for
diastolic and systolic phases, assessed by comparing concordant and discordant
selections between reviewer 1 and reviewer 2 in step 1, reconstruction window.
Interobserver variability in manual segmentation process was evaluated by
comparing end-systolic (ESV) and end-diastolic (EDV) right ventricular volumes
obtained by each reviewer after concordant selections of reconstruction
windows by both reviewers (step 2, segmentation process).The variability of
RVEF measurements with CT was investigated by comparing each reviewer's
measurement on MDCT with that obtained on equilibrium radionuclide
ventriculography (step 3, MDCT vs scintigraphy). Agreements between two
reviewers and between MDCT and scintigraphy were assessed by means of
intraclass correlation coefficient. Agreement was also assessed by
Bland-Altman method and by mean absolute percent error.
