Radiation Therapy Exam Questions With 100% Pass

Radiation Therapy Exam Questions With 100% Pass radiation therapy is a ... therapy for solid tumors - Answer- local radiation vs. chemotherapy - Answer- radiation= local chemo= systemic high energy ionizing radiation used to target.. - Answer- tumor cells 3 ways to administer radiation therapyh *= most common - Answer- 1. external beam ** 2. implant therapy 3. systemic radiotherapy External beam/ Teletherapy examples *= most common machine used - Answer- 1. linear accelerator ** 2. cyberknife 3. cobalt, orthovoltage machine radiation therapy from a distance - Answer- teletherapy short distance radiation therapy - Answer- bracytherapy 3 types of implant therapy - Answer- 1. short term 2. permanent implants 3. surface applicators indications for radiotherapy - Answer- 1. companion animal tumrrs 2. large animal tumors 3. human do we perform a lot of linear accelerator radiotherapy on horses? - Answer- no sedation multiple times, multiple treatments companion animal radiotherapy 2 forms of therapy - Answer- 1. definitive therapy: curative intent 2. palliative therapy: pain relief over ... of people with cancer are given some form of radiotherapy as part of their treatment - Answer- half radiation only works where... - Answer- you put it - field is collimated much like a diagnostic radiograph do animals get radiation sickness when treated? - Answer- no, only local side effects how radiation works it is an ionizing radiation with high ... photons - Answer- energy radiation used is 1000x kVp of X ray energy ... voltage - Answer- megavoltage what is targeted with radiation therapy? - Answer- DNA - damages the cells causing them to die when they attempt to undergo mitosis radiation sensitivity is greatest at what part in the cell cycle?*** - Answer- G2/M combining different modalities of radiotherapy can target... - Answer- different phases of cell cycle radiation damage does radiation just target the tumor? - Answer- no, it will also target the surrounding healthy tissue causing damage when do we see radiation damage?* - Answer- when cells go through MITOSIS each does of radiation is called a .. - Answer- fraction (fx) unit of radiation - Answer- Gy (gray) Linac stands for.. - Answer- linear accelerator RT or XRT stands for.. - Answer- radiation therapy fractionation* total dose (Gy) = ...x... - Answer- number of fractions x fraction size fractionation can give a higher ... with smaller.... to avoid permanent damage - Answer- higher total dose with smaller fraction size tissue repairs itself between fractions which heals better, normal tissue or tumor? - Answer- normal tissue tumor what type of normal tissue is MOST sensitive to the size of each fraction - Answer- LATE responding normal tissue fractionation protocols 10-20 fractions x 2.5-4.1 Gy= 48-60 Gy - Answer- conventional protocol fractionation protocol 2-6 fractions x 4019 Gy= 20-36 Gy - lower the number of treatments because we are giving more radiation - Answer- hypofractionation "coarse" conventional vs. hypofractionation type of therapy - Answer- conventional: curative intent hypo: palliative/ sterotactic radiation therapy/ non curable tumor that we can shrink to make patient feel better definitive radiation a. ... intent b. combined with ... sometimes - Answer- a. curative b. surgery radiation works best in a ... disease setting - Answer- microscopic - less than 1 billion cells, then prognosis is better (cubic cm of tissue) if we cannot use surgery, definitive radiation can be used in high dose. don't expect a cure but can prolong quality of life 2 ex of tumors that we utilize this for - Answer- 1. nasal 2. brain