Can we use a plastic cover over the head of ultrasound or PEMF to avoid cross contamination, especially concerning if using on different individuals?

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