Radiotherapy Flashcards
What type of radiotherapy would be used for lesions requiring full dose to the surface (skin) to max 2-3cm depth meaningful treatment such as to the following areas:
Eyes
Skin lesions
Post op skin lesions
Benign conditions
Superficial KV photons
Only penetrates a few mm (good for skin lesions)
LINAC based treatments utilise what as radiotherapy? [1]
Electrons
LINAC Electron based treatments are used for lesions in where in body? [4]
Lesions requiring dose closer to the skin
Lesions on the skin – using bolus
Skin
Lymph node regions
Where would LINAC based treatments: MV photons (mega voltage) [1]
What is dosing regimen like? [1]
More penetrative treatment and dose at depth
High dose radical treatments are fractionated (broken up into smaller daily treatments) to deliver treatment safely and avoid damage to adjacent normal tissues/organs
What are stereotactic radiotherapy treatments? [1]
Higher dose treatments: smaller margins, closer monitoring
Often considered ‘radiosurgery’, very targeted
What is brachytherapy?
Using radioactive seed or implant to deliver targeted radiotherapy
Brachytherapy can be used in which locations? [2]
Prostate – implanted radioactive seeds which deposit dose into prostate tissue
Cervix – radioactive seed Ir192 introduced via rods inserted through the tumour/cervix. Treatment plan created to calculate dwel l time of seed at various positions to deposit dose before removing.
What is neoadjuvant chemotherapy? [1]
Treatment given as a first step to shrink a tumor before the main treatment is given
What is adjuvant chemotherapy? [1]
after primary treatment with surgery or radiotherapy
What is concomitant chemotherapy? [1]
Given at the same time as radiotherapy
What is the most common platinum agent used for chemotherapy in concomitant therapy? [1]
cisplatin given with radiotherapy for SCC- acts as a radiosensitiser in many cases
