Figure 1:

Cartoon representation of $\text{Φ}$, which includes velocities $v$ over ±FOV_v, off-resonance values $\text{Δ}f$ across ±125 Hz, and RF transmit scaling $b_1$ from 1–0.5. ${\text{Φ}}_b\in \text{Φ}$, where ${\text{Φ}}_b$ includes only low-velocities $v_m$ anticipated over the myocardium during stable diastole. ${\text{Φ}}_m\in \text{Φ}$, where ${\text{Φ}}_m$ includes the range of expected coronary arterial blood velocities $v_b$. $v$ represents the velocity vector component encoded along the z-direction. While this whole space is considered for optimization, later figures only show ASL signal as a function of off-resonance for b₁=1, and ASL signal as a function of b₁ scale for $\text{Δ}f=0$.