The first question concerns the definition of accuracy. The calculationofaccuracyrequiresdeterminings…
ificity (2). This study evaluates sensitivitybut not specificity when comparing the new Emory …

Criteria for Reversibility. Since exercise and delayed 201Tl images are processed by the
same technologist in standard clinical practice, intraobserver variability was used to define …

In this issue Holman and his colleagues have described a new myocardial perfusion
imaging agent, hexakis (t-butylisonitrile)-technetium (I)[Tc-99m TB!](1). In order to view their …

The clinical usefulness ofan imaging modality depends on its sensitivity, specificity and
predictive accuracy. However, of equal imponance is the reproducibility of inretpretation, not …

Myocardial ischemia is currently interpreted from SPECT thallium-201 (@ Â1Tl) tomograms
by the subjective visual finding of stress-induced perfusion defects which †œnormal ize― …

MATERIALS AND METHODS One hundred sequential Tl-201 myocardial images were
retrospectively selected; 50 from each institu tion. Selection criteria were identical at the two …

washoutin which the patient'sstressa@ dwashoutcircumferentialprofilesare compared with
observed normal limits. The present study reports the results of a muldcentar thai In which …

50% Nyquist, order5. For thetypeB systemsthefilter parame tess for stress were:
Criticalfrequency ofO. 52 cycles/cm, powerS, and for rest imageswere: criticalfrequencyof 0.4 …

Sestamibi planar myocardial perfusion studies were performed at Hotel-Dieu de Montreal on
28 patients with documented coronary artery disease and 16 normal subjects. Stress and …

Quantitative analysis of 201T1images has been proposed as a method of improving the
detection and localization of myocardial isehemia (18). Unfortunately, computer programs …