Plesiotherapy

Plesiotherapy is a radiation therapy modality in which a source of ionizing radiation is placed in contact with the exterior surface of the body.[1]

This is as distinguished from teletherapy in which radiation is projected by the source from a distance, from brachytherapy in which one or more sealed sources of radiation are placed inside the body, and from radiopharmaceutical therapy in which a source is introduced into the body, but that source is unsealed.

In contrast with teletherapy, where the distance between the source and the patient is exploited to produce a shallow fall-off of beam intensity with depth; in plesiotherapy, the source geometry is exploited to produce a dose fall-off that is steep, for treating superficial areas.[2][3][4]

One example of plesiotherapy is use of the 90Sr eye applicator in the treatment of pterygium.[5]

References
  1. "Glossary of Medical Physics and Radiology". Glossary. Medical Physics Publishing. Retrieved May 13, 2020.
  2. Mitchell, A.; Jacob, D.; Andreou, K.; Raben, A.; Chen, H.; Koprowski, C.; Mourtada, F. (2014). "SU-D-19A-07: Dosimetric Comparison of HDR Plesiotherapy and Electron Beam Therapy for Superficial Lesions". Medical Physics. 41 (6 Part 3): 111. Bibcode:2014MedPh..41..111M. doi:10.1118/1.4887870. ISSN 2473-4209.
  3. Ray, Amitabh; Basu, Ayan; Aich, Ranen; Biswas, Litan; Pal, J (2010). "Plesiotherapy for non-melanoma skin cancer: Innovating to overcome!". Indian Journal of Dermatology. 55 (4): 363–6. doi:10.4103/0019-5154.74547. PMC 3051298. PMID 21430891.
  4. Korzeniowski, MA; Crook, JM (30 Sep 2017). "Contemporary role of radiotherapy in the management of penile cancer". Translational Andrology and Urology. 6 (5): 855–867. doi:10.21037/tau.2017.07.02. PMC 5673811. PMID 29184783. Retrieved 14 May 2020.
  5. Stevenson, T. C. (1953). "Use of strontium 90 applicator in beta ray therapy of the eye". Transactions of the Pacific Coast Oto-Ophthalmological Society Annual Meeting. 34: 115–123. PMID 13146801. Retrieved 11 August 2023.


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