Fig. 1

Modification of the presaturation pulse. a It is an imaging plan for the time-of-flight magnetic resonance angiography. The presaturation pulse (yellow box) for the venous saturation is placed above the actual imaging plan (red box). b Standard slab-selective RF pulse (left) and GR (right) waveform (black lines) are changed to new-shaped models (red line) using the minimum-time variable-rate selective excitation algorithm. RF, radiofrequency; GR, gradient waveform