Induction methods of diathermy involve placing the body part into what?

Induction methods of diathermy involve placing the body part into what?

• A. An electromagnetic field
• B. A magnetic shield
• C. A heat source
• D. An optical field

Answer: (A)

Induction diathermy heats tissue by using an electromagnetic field. A high-frequency current in a coil creates a rapidly changing magnetic field; when the body part is placed in that field, the changing magnetic field induces eddy currents in the tissue. These currents meet resistance in the tissue and convert the energy into heat, warming deeper structures. A magnetic shield would block or alter the field rather than generate heat, so it isn’t the method used. A heat source would provide direct external heat (conduction), not induction heating. An optical field involves light or lasers, which is a different modality.

Induction diathermy heats tissue by using an electromagnetic field. A high-frequency current in a coil creates a rapidly changing magnetic field; when the body part is placed in that field, the changing magnetic field induces eddy currents in the tissue. These currents meet resistance in the tissue and convert the energy into heat, warming deeper structures.

A magnetic shield would block or alter the field rather than generate heat, so it isn’t the method used. A heat source would provide direct external heat (conduction), not induction heating. An optical field involves light or lasers, which is a different modality.