PMID: 751731Jan 1, 1978Paper

Determination and importance of the magnification factor in the calculation of ventricular volume: development of a simple, accurate method

Catheterization and Cardiovascular Diagnosis
P N CascadeM Rubenfire

Abstract

A study of single-plane right anterior oblique left ventricular angiography was undertaken to determine the importance of obtaining correct positioning of a magnification grid and to develop a simple but accurate technique to minimize magnification errors. Theoretical and experimental volume determinations demonstrated 3% to 28% volume errors for grid placement errors ranging from 1 centimeter to 5 centimeters. An experiment was designed whereby cross table lateral radiographs of the chest were taken during contrast injections of the left ventricle. The relative position of the left ventricular center was found at a point 66% of the distance from the anterior to the posterior margin of the heart. Finding this point on noncontrast lateral films of the chest for positioning of a square centimeter grid should yield a more accurate determination of the magnification factor than other current emperic methods.

References

Jan 1, 1976·Catheterization and Cardiovascular Diagnosis·H R WagnerT O Siu
Jan 1, 1975·Catheterization and Cardiovascular Diagnosis·J H Gault
Jan 1, 1967·Circulation·D G GreeneI L Bunnell
Aug 1, 1972·The British Journal of Radiology·G M Rees
Mar 1, 1969·Investigative Radiology·I S Kasser, J W Kennedy

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Citations

May 1, 1983·Progress in Cardiovascular Diseases·W Bulawa, S N Meyers
Jan 12, 2001·Current Problems in Cardiology·M A Schmidt, M R Starling

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