Radiation therapy questions with correct answers

What is brachytherapy? - Answer radiation at a short distance using radioactive isotopes What is Plesiotherapy? - Answer contact/surface therapy; applicators that are placed directly onto superficial tumors What are interstitial/intracavitary implants? - Answer implanted into tissues; What is teletherapy? - Answer radiation from a distance What the 2 types of teletherapy? - Answer Orthovoltage( low voltage) and Megavoltage( highvoltage) What are the advantages of Megavoltage teletherapy? - Answer deeper penetration, homogeneously absorption and tissue sparing What are the disadvantages of Orthovoltage teletherapy? - Answer less tissue penetration, heterogenous absorption( bone more), unpredictable, highes dose at skin surface