diastolic pseudogating
Diastolic pseudogating appears as periodic bright and dark signal in arteries such as the aorta as one progresses through a series of images. Synchronization of the cardiac cycle and the pulse sequence results in high signal in the artery during diastole when blood is relatively stationary and loss of signal during systole when flow is high.
The change in intensity of blood occurs when there is synchronization of the cardiac cycle and the pulse sequence, i.e., repetition rate = heart rate or TR=1/HR.
In the contiguous series of axial images through the lower chest and upper abdomen on the right you can see the intensity of the aorta alternate between dark to bright.
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