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RTT Orientation Exam Questions And Accurate Answers
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RTT Orientation Exam Questions And Accurate AnswersWhat does SSD stand for?
Source to skin distance
What does SAD stand for?
Source to axis distance
What does DRR stand for?
Digitally Reconstructed Radiograph
What does IGRT stand for?
Image guided radiation therapy
What does SRS stand for?
Stereotactic radiosurgery
What does SBRT stand for?
Stereotactic body radiation therapy
What does IMRT stand for?
Intensity-modulated radiation therapy
What does ODI stand for?
Optical distance indicator
What does MU stand for?
Monitor units
What does QA stand for?
Quality assurance
What does MLC stand for?
Multi-leaf collimator
Briefly explain the treatment light field of the treatment machine
The light field is used to display the position of the radiation field on the patient skin. In
, other words, it shows the area where radiation from the machine will cover.
What material are the MLC's made out of?
Tungsten
Typically how many MLC's are there in a linac?
120
The part of the linac that rotates around the patient:
Gantry
The target of the linear accelerator where the electrons are accelerated towards is
made of:
Tungsten
Briefly describe what a bolus is made of and what is the purpose of a bolus
A bolus is made of a tissue-equivalent material and its purpose is to bring the radiation
dose higher to the skin surface instead of deeper in the patient.
If a patient is prone :
They are laying on their stomach
If a patient is supine:
They are lying on their back
Briefly describe what brachytherapy is
Brachytherapy is a type of treatment where seeds are placed in your body at or near the
area of treatment. These seeds contain radiation which treats the cancer.
Briefly describe why a Dr. would prescribe electron treatment for a patient
Electron treatment can be used to treat more superficial cancers like skin cancer. A Dr.
would prescribe this type of treatment because it is less penetrating, and only treats
superficial areas.
What does the acronym AIR stand for?
Anterior, inferior, right
When making these shifts, always add to the number on the monitor. When shifting
posterior, superior, or left you would subtract from the number on the monitor.
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