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A quadrant slant-hole (QSH) collimator was constructed for myocardial perfusion tomography on a 15-inch large-field gamma camera. This system optimizes the crystal area for multiple-view photon detection while at the same time offering excellent tomographic performance. In addition to the advantages associated with parallel slant-hole collimation, this(More)
Most current methods for measuring the number of clusters use optimum index values by comparing within-group and between-group variations at a global scale. An indicator based on local spatial variation to decide the existence of local scale cluster is needed. This study employed a new k-means algorithm for cluster analyses and geostatistical variograms for(More)
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