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

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