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Thallium-201 stress-redistribution myocardial rotational tomography: development of criteria for visual
Insights
Single photon emission computerized tomography (SPECT) with thallium-201 (Tl-201) effectively detects coronary artery disease (CAD). New criteria improve SPECT
Area of Science:
- Nuclear Cardiology
- Cardiovascular Imaging
- Medical Diagnostics
Background:
- Planar thallium-201 (Tl-201) scintigraphy has limitations in localizing coronary artery disease (CAD) due to myocardial segment overlap.
- Single photon emission computerized tomography (SPECT) offers a 3D view of Tl-201 distribution, potentially improving CAD localization.
Purpose of the Study:
- To systematically develop visual interpretive criteria for perfusion abnormalities using SPECT stress-redistribution Tl-201 imaging.
- To evaluate the diagnostic performance of these criteria for overall CAD detection and localization within specific coronary circulations.
Main Methods:
- SPECT stress-redistribution Tl-201 imaging was performed on 50 consecutive patients (22 normal, 28 with CAD).
- Visual interpretive criteria for perfusion defects were developed and applied to SPECT images.
- Diagnostic accuracy (true positive/negative rates) was calculated for overall CAD detection and for anterior, posterior, and dual coronary circulation disease.
Main Results:
- A criterion of ≥8 sectors with moderately decreased Tl-201 uptake demonstrated 96% true positive and 91% true negative rates for overall CAD detection.
- For anterior circulation disease, ≥3 sectors of moderately decreased uptake yielded 71% true positive and 100% true negative rates.
- For posterior circulation disease, rates were 100% true positive and 50% true negative; for dual circulation disease, rates were 71% true positive and 82% true negative.
Conclusions:
- SPECT stress-redistribution Tl-201 imaging, with developed visual criteria, is highly sensitive and specific for overall CAD detection.
- The established criteria enhance the localization of CAD within anterior and posterior coronary circulations, aiding in more precise diagnosis.
Abstract:
Despite high sensitivity and specificity for overall detection of coronary artery disease (CAD), planar stress-redistribution thallium-201 (Tl-201) scintigraphy remains suboptimal in localizing disease, because of overlap of myocardial segments. Single photon emission computerized tomography (SPECT), by providing three-dimensional representation of myocardial Tl-201, offers promise for improved localization of CAD. In 50 consecutive patients (22 normal and 28 with CAD), who underwent SPECT stress-redistribution Tl-201 imaging, we systemically developed visual interpretive criteria for perfusion abnormality on SPECT. For overall detection of disease, the best criterion for abnormality was greater than or equal to 8 sectors of moderately decreased Tl-201 uptake. With this criterion, the true positive and true negative rates for overall detection of disease were 96% and 91%, respectively. The best criterion for significant defect in the anterior or posterior coronary circulation was greater than or equal to 3 sectors of moderately decreased Tl-201 uptake. With this criterion, the true positive and true negative rates for anterior circulation disease were 71% and 100%, respectively. With respect to posterior circulation disease, the true positive and true negative rates were 100% and 50%, respectively. Regarding identification of dual circulation disease, the true positive and true negative rates were 71% and 82%, respectively.