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Quantifying Transient Ischemic Dilation Using Gated SPECT

Northwest Molecular, Kellogg, Idaho

View larger version (20K): [in a new window]   FIGURE 1. Relationship between ESV weighing factor Z, myocardial ischemia, and SDS as determined by their correlation coefficient after correcting for type of cardiac stress performed. When Z = 5, correlation is greater than either stress-to-rest EDV ratio (Z = 0) or stress-to-rest ESV ratio (Z = ).

View larger version (18K): [in a new window]   FIGURE 2. After correcting for type of cardiac stress performed, correlation coefficient between myocardial ischemia and ESV weighing factor Z reaches its peak when Z value is between 4.6 and 5.

View larger version (30K): [in a new window]   FIGURE 3. Representative midventricular tomograms from end-diastole (left), end-systole (middle), and summed planar tomogram (right). There is an increased count density at end-systole compared with end-diastole, creating a much greater contribution to summed planar tomogram from which the TID ratio is derived.