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K1 estimates obtained with 99mTc-tetrofosmin SPECT (filled cicles, black) and 13N-NH3 PET (filled squares, red) plotted against the estimated MBF measured with 13N-NH3 PET for 9 patients at rest and stress. Note that K1 estimates measured with 13N-NH3 PET is nearly idential with MBF.
