Visualization of myocardial 101thalium clearance

Differences in the distribution pattern of 201thallium between late and initial views after physical exercise or pharmacological dilatation of the coronary vessels, can be represented in parametric images by exactly superimposing the scintigrams. The regional parametric distribution is particularly well suited for establishing the diagnosis when several vessels are diseased, or for decisively confirming the presumptive diagnosis, since conventional 201thallium scintigrams can sometimes fail to reveal any marked distribution anomalies of the activity. Colour documentation is of particular importance for pointing up small regional parametric differences in the assessment and in documentation. (orig.)