Key result
A geometric method for measuring left ventricular volumes from gated blood-pool studies using a slant-hole collimator correlated highly with contrast ventriculography (r=0.93 for end-diastolic volume).
Why the study?
Does a geometric method using a slant-hole collimator accurately measure left ventricular volumes compared to contrast ventriculography in patients?
Observational (n=30)
Does a geometric method using a slant-hole collimator accurately measure left ventricular volumes compared to contrast ventriculography in patients?
A geometric method using a slant-hole collimator for gated blood-pool studies provides accurate left ventricular volume measurements highly correlated with contrast ventriculography.
Answers are grounded in this paper and cite their sources.
May support slant-hole collimator for gated LV volumetry; leaves open prospective validation before practice change.
A geometric method of measuring absolute left ventricular volumes from gated blood-pool studies obtained in a single-plane modified left anterior oblique view was evaluated prospectively in 30 patients who also underwent single-plane contrast ventriculography. The gated studies used a 30 degrees straight-bore slant-hole collimator with the holes slanted caudally. Left ventricular end-diastolic volume was calculated using the area-length method, with semiautomatic definition of the left ventricular region of interest and the maximum length of the left ventricle. Ejection fraction was determined from the left ventricular time/activity curve. The left ventricular end-systolic volume was derived using the end-diastolic volume and ejection fraction. Correlation coefficients between the two methods were 0.93 for end-diastolic volume, 0.95 for end-systolic volume, and 0.91 for ejection fraction. This method provided accurate and highly reproducible measurements of actual left ventricular volumes and was easily applicable in routine clinical studies.
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Uren et al. (1983) reported an observational. Geometric method from gated blood-pool studies using a slant-hole collimator vs. Single-plane contrast ventriculography was evaluated on Correlation of left ventricular volumes and ejection fraction (r=0.93 for end-diastolic volume, r=0.95 for end-systolic volume, r=0.91 for ejection fraction). A geometric method for measuring left ventricular volumes from gated blood-pool studies using a slant-hole collimator correlated highly with contrast ventriculography (r=0.93 for end-diastolic volume).
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