Analysis of edge-tracking errors inherent in fluoroscopic images of the beating heart.

Abstract:

RATIONALE AND OBJECTIVES:Because of the complex relationships between the dynamic three-dimensional cardiac surface shape and its projected image, errors arise with the use of two-dimensional silhouettes to measure displacements of the heart. The character and frequency of such errors are examined. METHODS:A high-precision x-ray scatter imaging technique was used to reconstruct the three-dimensional shape of the left ventricular free wall throughout the cardiac cycle. Displacements of the three-dimensional surface were then compared with those on the two-dimensional projected silhouette. Silhouette displacement errors were determined as a function of time during the cardiac cycle and variability between hearts. RESULTS:Differences between silhouette measurements and those on the cardiac surface range from 0% to 125% of peak-to-peak displacements occur, along 33% to 75% of the silhouette contours and cover 66% of the cardiac cycle. CONCLUSION:Two-dimensional silhouette displacements provide inconsistent measurements of motion patterns on the three-dimensional cardiac surface.

journal_name

Invest Radiol

journal_title

Investigative radiology

authors

McInerney JJ,Weldner PW,Herr MD,Copenhaver GL

doi

10.1097/00004424-199403000-00004

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

273-80

issue

3

eissn

0020-9996

issn

1536-0210

journal_volume

29

pub_type

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