Reduced FOV velocity mapping by complex subtraction unfolding

Motion encoding sequences require a long acquisition time. To reduce motion artifacts on the time-resolved images, a relatively long breath-hold, reaching 25 to 30 seconds, is required from the patient. A technique that allows dynamic acquisition time optimization through field of view (FOV) reduction was proposed and studied in order to reduce breath-hold duration. The technique unfolds fold-over regions by complex difference of two images, one of which is motion encoded and the other acquired without an encoding gradient. By implementing this method, Proof-of-concept is demonstrated on a volunteer providing stimulating preliminary results in order to achieve multi-dimensional velocity and acceleration mapping in a single breath-hold.

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