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A diagram outlining the principle of pseudocontinuous ASL imaging. Inflowing arterial water is labelled by applying an inversion radiofrequency pulse at the neck. A “labelled” image is then acquired. Subsequently, a “control” image is acquired without labelling. The final image is produced by subtracting the “labelled” image from the “control” image. Diagram reproduced with permission from the Functional MRI Laboratory, University of Michigan.
