Which sequence uses T1 gradient echoes and suppresses signal from stationary tissues?

The choice indicating TOF MRA as the correct answer is appropriate due to its specific technique that enhances the visibility of flowing blood while minimizing the signal from stationary tissues. Time-of-Flight (TOF) Magnetic Resonance Angiography is particularly effective because it uses a combination of T1-weighted gradient echo sequences and specific timing of radiofrequency pulses to saturate the signal from stationary tissues like muscle and fat.

This selective suppression allows for the vivid contrast to be created where blood flow occurs, making the vascular structures stand out clearly against the background of surrounding tissues. As regionally stationary tissues receive saturation pulses that effectively null their signal, it results in clearer images of the vessels filled with flowing blood.

In contrast, other options like CE MRA, PC MRA, and diffusion-weighted sequences either do not primarily feature T1 gradient echoes or serve different purposes such as contrast enhancements, phase contrast imaging, or diffusion measurements. Thus, TOF MRA is unique in its method of suppressing signals from static tissues while enhancing the moving blood signal, making it the correct selection for this question.