Can we use a plastic cover over the head of ultrasound or PEMF to avoid cross contamination, especially concerning if using on different individuals. Would it interfere on any way? Also, some say use gel.

Yes, you can use a plastic cover for PEMF without interfering the usage. For ultrasound it is also possible, but it will interfere the usage in a minor way.

You don't need gel for PEMF because PEMF is a non contact mode. There is no electrical current flowing from the coil to the body. For ultrasound you should use a gel to enhance the contact.

For more details, please check the link:

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