[Retracted] Changes of Short-Term Heart Rate Variability and Vertebral Artery Magnetic Resonance Angiography in Patients with Cervical Vertigo

Figure 2

Relationship between excitation angle and in TOF technology (a) represents the case of TR/T1 = 0.01, and (b) represents the case of TR/T1 = 0.1. j represents the number of stimulation pulses received by circulating blood within the FOV imaging area. In MRI, the location of proton populations in resting tissue is relatively constant, but the location of proton populations in circulating blood is constantly changing, which inevitably affects MRI signals. An example of flow in the read direction is the rotation of the flow during sampling, which simply moves in the direction of the read gradient.

(a)

(b)