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Comparison between vertical parallel hole collimator and 30 degrees rotating slant hole collimator for assessing
P Berthout1, J C Cardot, R Faivre
1Service de Cardiologie, C.H.U. de Beançon, France.
Insights
Equilibrium radionuclide angiography accurately assesses left ventricular ejection fraction (LVEF) and regional wall motion abnormalities. This technique shows strong correlation with contrast ventriculography, offering a reliable diagnostic tool for heart disease.
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Assessing left ventricular ejection fraction (LVEF) and regional wall motion abnormalities is crucial for diagnosing and managing heart conditions.
- Equilibrium radionuclide angiography (ERNA) is a non-invasive imaging technique used for cardiac function assessment.
Purpose of the Study:
- To evaluate the diagnostic accuracy of ERNA using two different collimator types (vertical parallel hole collimator - VTC, and 30 degrees rotating slant hole collimator - RSHC) in assessing LVEF and regional wall motion abnormalities.
- To compare the performance of ERNA with contrast ventriculography (CV), the gold standard for evaluating cardiac function.
Main Methods:
- 40 patients (30 with coronary artery disease, 10 with valvular heart disease) underwent ERNA with VTC and RSHC in various views.
- Scintigraphic data were analyzed for LVEF and regional wall motion.
- ERNA results were compared against CV findings, including sensitivity, specificity, and agreement for regional wall motion abnormalities.
Main Results:
- ERNA demonstrated a strong correlation with CV for LVEF (r=0.89 for VTC, r=0.87 for RSHC).
- For regional wall motion analysis in coronary artery disease patients, VTC showed 100% sensitivity and 63% specificity, while RSHC achieved 91% sensitivity and 87% specificity.
- Agreement in localizing wall motion abnormalities between ERNA and CV was comparable for both collimators (70.6% for VTC, 71.2% for RSHC).
Conclusions:
- ERNA is a reliable method for assessing LVEF and regional wall motion abnormalities, correlating well with contrast ventriculography.
- The 30 degrees RSHC offers a better balance of sensitivity and specificity for detecting regional wall motion abnormalities compared to the VTC.
- ERNA serves as a valuable non-invasive tool in the diagnosis of cardiac diseases like coronary artery disease and valvular heart disease.
Abstract:
Left ventricular ejection fraction (LVEF) and regional wall motion abnormalities were determined in 40 patients (30 with coronary artery disease and 10 with valvular heart disease) using equilibrium radionuclide angiography. Scintigraphic acquisitions were collected in random order with 2 different collimators as follows: in anterior face (AF), left anterior oblique (25 degrees-45 degrees LAO) and 70 degrees LAO, with a vertical parallel hole collimator (VTC), and in 25 degrees-45 degrees LAO and 65 degrees-80 degrees LAO with a 30 degrees rotating slant hole collimator (RSHC), with the slant of the collimator directed towards the cardiac apex in both projections. Results were compared to contrast ventriculography (CV) performed in the 30 degrees right anterior view (3 segments: anterior, apical, inferior) and in a 60 degrees left anterior oblique view (3 segments: septal, apical and lateral). Radionuclide LVEF in both series was closely correlated with contrast ventriculographic LVEF (r = 0.89, VTC vs CV and r = 0.87, RSHC vs CV, respectively). Regional wall motion analysis was only performed among the 30 patients suffering from coronary heart disease. Eight contrast angiographic studies were normal and 22 abnormal. Global sensitivity and specificity were 100% and 63% with the VTC (3 false positives) and 91% and 87% with the 30 degrees RSHC (2 false negatives and 1 false positive, P = ns). Agreement for the localisation of the regional wall motion abnormalities between CV and radionuclide angiography was 70.6% with the VTC and 71.2% with the RSHC (P = ns).(ABSTRACT TRUNCATED AT 250 WORDS)