There isn't a restraint strong enough to prevent image degradation from movement. Clench and unclench a muscle group and you'll ruin images through that area.
Breath-holding can be controlled via the anaesthetist. For example, cardiac imaging on young humans requires a GA. Tying down a kid to force them into a scanner would be brutal? No thanks. Many are just terrified, and will remember the event, making subsequent scans even harder. This doesn't seem like something anyone would advocate.
There isn't a restraint strong enough to prevent image degradation from movement. Clench and unclench a muscle group and you'll ruin images through that area.
Breath-holding can be controlled via the anaesthetist. For example, cardiac imaging on young humans requires a GA. Tying down a kid to force them into a scanner would be brutal? No thanks. Many are just terrified, and will remember the event, making subsequent scans even harder. This doesn't seem like something anyone would advocate.