Evaluation of Methods for Quantitating Left Ventricular Segmental Wall Motion in Man Using Myocardial Markers

Radiopaque markers were implanted in the left ventricular myocardial midwall in 58 patients and studied in the 30° right anterior oblique projection by computer-aided fluoroscopy. Marker motion was used as a standard of segmental wall motion against which the accuracy of five methods for measuring left ventricular wall motion was assessed: two methods using hemiaxial measurements in rectangular coordinates, two using radial measurements in polar coordinates (all with frame-by-frame axial reindexing) and one using radial measuremehts in fixed external polar coordinates. The latter method showed significantly les error (25.9%, p < 10-6) in measuring midwall marker motion than the other four methods (range 42.5-47.5%) in the