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Radiation Therapy Techniques Exam Questions with Correct Answers
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  • Course
  • Radiation therapy
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  • Radiation Therapy

Mark all concerning wedges: - reduce hot spots - can be hard or dynamic - used for tissue compensating of sloping surfaces - known as superflab - Answer-- reduce hot spots - can be hard or dynamic - used for tissue compensating of sloping surfaces Irradiated volume - Answer-Volume of ...

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  • October 7, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • radiation therapy techniques exam questions with c
  • mark all concerning wedges reduce hot spots

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  • Radiation therapy
  • Radiation therapy

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Radiation Therapy Techniques Exam
Questions with Correct Answers
Mark all concerning wedges:
- reduce hot spots
- can be hard or dynamic
- used for tissue compensating of sloping surfaces
- known as superflab - Answer-- reduce hot spots
- can be hard or dynamic
- used for tissue compensating of sloping surfaces

Irradiated volume - Answer-Volume of tissue receiving a significant dose (50% or more
of the prescribed dose)

GTV - Answer-The gross, palpable, visible, or clinically demonstratable location of the
cancerous growth

CTV - Answer-Tissue volume that contains the clinical and subclinical disease

PTV - Answer-Surrounds the clinical and subclinical growth and an additional margin to
compensate for different types and variations and uncertainties of the beam

Treated volume - Answer-Larger than the target volume, encompasses the additional
margins around the target to allow for limitations of the treatment technique

Localization - Answer-geometrical definition of the tumor and anatomic structures using
surface or fiducial marks for reference

Verification - Answer-a check that each beam/port covers the intended treatment area
and spares organs at risk

Simulation - Answer-The process carried out by the radiation therapist under the
direction of the radiation oncologist. This is a mock up of the patient positioning for
treatment

IFD - Answer-Patient separation between two beams

Is a photon beam heterogenous or homogenous? - Answer-Heterogenous

What is the average energy of an 18MV beam? - Answer-6mv

SAD setup - Answer-iso in 100 or less

SSD setup - Answer-iso is 100 or more

, What is the importance of shielding blocking devices - Answer-- high intensity
- high atomic number
- low melting point

Shielding material should the original intensity of the beam to ___% or less - Answer-5

MLC or blocks should be at least ___ cm away to avoid ___scatter - Answer-15-20,
electron

What are the material and amount of those materials in cerrobend? - Answer-Bismuth -
50%
Lead - 26.7%
Tin - 13.3%
Cadmium - 10%

What is the most toxic ingredient in cerrobend? - Answer-Cadmium

What is true about compensators? - Answer-- maintain skin sparing
- used for tissues with different densities
- allow for normal depth dose for irregular surfaces

What are the different types fo wedge filters? - Answer-- EDW
- Virtual
- Dynamic
- Individualized

What does bolus change? - Answer-The location of DMAX

What does bolus do to skin sparing? - Answer-Decreases skin sparing because DMAX
depth is decreased.

What angle are EDW wedge filters measured at? - Answer-10cm

Do compensators affect DMAX? - Answer-no

4mv DMAX - Answer-1cm

6mv DMAX - Answer-1.5 cm

10mv DMAX - Answer-2.5cm

18mv DMAX - Answer-3.5cm

24mv DMAX - Answer-4cm

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