Fig. 6
From: Hyperpolarized 13C urea myocardial first-pass perfusion imaging using velocity-selective excitation
Representative comparison of perfusion curves extracted from a 6 sector AHA segmentation (a). Measurements were obtained within the same maintained dobutamine administration in the same animal for: (b) 13C urea conventional excitation. (c) 13C urea velocity selective excitation. (d) 1H gadolinium. Myocardial response data is presented as measured (markers) and fitted (lines). Arterial input data (red) is downscaled by factors 5 or 20 for better visualization. Gamma-variate fitting was employed for input curves and 13C urea response, 4th order polynomials were used for 1H gadolinium response