We are designing a study for aortic valve evaluation using NaF. Would Cardiac gatting be useful?
I would say yes, for a number of reasons:
- It's added information at very little extra effort
- It allows you to see the motion of your target across the cardiac cycle so you can estimate its effect on your signal (and AoV especially moves asymmetrically which may lead to asymmetrical blurring in the final composite image).
- If you perform gated imaging at a longer scan time, you could get images in a particular phase of the cardiac cycle with the same amount of counts as a "normal" ungated scan. To explain: if a normal ungated scan would be performed at 3 min/bedposition, a gated scan of the heart of 16 min and 8 frames of gating would give you each frame at (16/8=) 2 min/bedposition, which would be 2/3 of a normal scan. That way, you could opt for evaluation of a mid-diastolic phase image at almost the same image quality as a "normal" scan.
Obviously the last comment means scanning the patient longer, but I feel it would be justifiable for the extra information.
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