Drawing of a capacitive diathermy physiotherapy device applied at the knee area. The high frequency electric field (dotted lines) formed between the two parallel condenser electrodes penetrates skin, soft tissues and bones. 

 
  Part of: Dougas G (2023) Electromagnetic radiation as antiviral treatment with a focus on Rabies post-exposure prophylaxis. Research Ideas and Outcomes 9: e107227. https://doi.org/10.3897/rio.9.e107227