different types of RT treatments (dosimetry)

conforms the radiation beam so that the target volume receives the prescribed dose and the surrounding healthy tissue receives a much lower dose

3D conformal

a mono energetic beam that is used to treat superficial tumors

electron beam

(T/F) electron beams scatter easily in air

T

electron beam has the field edges balloon out because why

bc of scatter and aren’t definitive like photo beams

for electron beam there is a “? ?” of dose, which means that deeper organs and tissues will receive very little or no dose

rapid fall off

electron has less or more skin sparing

what does that mean?

less

more dose to the skin compared to photons

what type of treatment is a radiation beam that has bearing intensity throughout the beam

IMRT

for IMRT, is the dose uniform?

No

what are two things that IRT uses to create a plan?

Inverse Treatment planning and dynamic MLC

• treats small tumors within the cranium at a high dose

• treats tumors with only one fraction

SRS

SRS is used for tumors that are usually used less than ? cm

3

For SRS treatment positioning must be accurate within ? millimeter

1

examples of machines that can perform SRS are what two things

gamma knife

cyber knife

treats small tumors outside the cranium with a very high dose for about 3-5 fractions

stereotactic body radiation therapy

radiation therapy that targets the whole body to prepare for bone marrow transplant and to treat other malignancies

total body irradiation

high energy charged particles, such as protons, alpha particles, and carbon ions

particle beam radiotherapy

how does the dose curve start and end when dealing w a proton beam

starts off low at the beginning, but then rapidly rises toward the end of the path and then abruptly falls to zero (bragg peak)