ASRT Exam 3 Flashcards
(38 cards)
The current of a CT scanner’s x-ray tube is controlled by:
mA
The component of the CT scanner that converts light to an electronic signal is the:
Photodiode assembly
___________ is the ethical theory that bases decisions on individual motives and morals.
Deontology
When interacting with mature adults over the age of 65, radiation therapists should remember:
Most of these individuals are senile.
These mature adults consider themselves at a disadvantage because of their age.
These mature adults consider themselves middle aged.
These mature adults are less educated and less health savvy than those under the age of 65.
These mature adults consider themselves middle aged.
Which of the following variations from treatment would be considered a systemic error?
Bolus was omitted for one fraction
Imaging was completed on fraction 7 rather than fraction 6
Wrong electron cutout was used for one day of the boost treatment
Wrong monitor units (MU) were inputed and used for the entire course of treatment
Wrong monitor units (MU) were inputed and used for the entire course of treatment
The imaging size of a CT scanner is most dependent on:
SFOV
By which two lymph node routes does ovarian cancer spread MOST often?
para-aortics and pelvic
cervical and intramammary nodes
para-aortics and intestinal
pelvic and cervical
para-aortics and pelvic
Average tissue-to-air ratio (TAR) is used when calculating monitor units for which type of treatment
fields?
Rotational fields
En face electrons
Parallel opposed fields
Four field box
Rotational fields
A common distant metastatic site of bladder cancer is the:
lung
To ensure patient safety, the NCRP requires testing of the interlocks system at least once per:
week
Non-small cell lung cancer commonly metastasizes to the:
brain
Which of the following are recommended skin care practices for patients undergoing radiation therapy to
the head and neck? Please select all that apply
Covering skin to protect from sunlight.
Use of a loofa sponge.
Application of water based lotion and creams.
If a patient needs to shave, electric razors are preferred.
Covering skin to protect from sunlight.
Application of water based lotion and creams.
If a patient needs to shave, electric razors are preferred.
Xerostomia occurs after _________ cGy resulting in significant long-term effects.
1000 cgy???
The legal term that describes the actions of a therapist that would be used by another therapist in similar
circumstances is _________________
standard of care
In the CT scanner, movable lasers are used to do which of the following? Please select all that apply.
Display field size
Provide isocenter position information
Reposition the CT table
Provide additional illumination
Display field size
Provide isocenter position information
Chemotherapy is administered concurrently with radiation therapy in the treatment of:
Hodgkin Lymphoma
Damage by ionization of a biologic macromolecule is caused by _______ action.
direct
When treating with multiple fields, what is TRUE regarding beam weighting?
The beam that is further from the tumor is given higher weight
Beam weighting is most useful when the target is midplane
Beam weighting is useful when treating through a sensitive structure
Beam weighting is only used when three or more fields are used
Beam weighting is useful when treating through a sensitive structure
MV port film image quality is low due to:
increased scatter
A cancerous tumor of the glandular tissue would likely be classified as a:
adenocarcinoma
Electron beam energy is reduced by _____ MeV per cm in unit density tissue.
2 MeV
What is the primary benefit of prone breast irradiation?
decreased heart dose
The term used to describe table movement per rotation divided by slice thickness is:
Voxel.
Hounsfield unit.
Roll.
Pitch.
pitch
The small bowel joins which component of the large intestine?
Ascending colon
Vermiform appendix
Hepatic flexure
Cecum
cecum
