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Intro to Radiation Therapy Ch 8 Exam Questions and Answers
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  • Radiation therapy
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  • Radiation Therapy

Beam Modifiers - Answer-Devices that change the shape of the treatment field or distribution of the radiation at depth Beam's Eye View (BEVs) - Answer-Visualization perspective that is "end on" or positioned as if looking at a volume from the source or radiation. Made possible from collected C...

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

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  • intro to radiation therapy ch 8 exam questions and
  • beam modifiers answer devices that change the s

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Intro to Radiation Therapy Ch 8 Exam
Questions and Answers
Beam Modifiers - Answer-Devices that change the shape of the treatment field or
distribution of the radiation at depth

Beam's Eye View (BEVs) - Answer-Visualization perspective that is "end on" or
positioned as if looking at a volume from the source or radiation.
Made possible from collected CT data, this perspective is essential in 3D planning

Collimation - Answer-

Elapsed Days - Answer-Total time over which radiation treatment is delivered

Feathering - Answer-Migration of a gap between treatment fields through the treatment
course

Fiducial Markers - Answer-Include natural anatomy or be artificial markers placed
internally or at the skin surface or fixed external to the patient to document location
through various imaging modalities

Fractionation - Answer-Radiation therapy treatments given in daily fractions over an
extended period of time, sometimes up to 6 to 8 weeks

Hinge Angle - Answer-Measure of the angle between central rays of two intersecting
treatment beams

Immobilization Device - Answer-Device that assists in reproducing the treatment
position while restricting movement

Interlocks - Answer-Safety switches blocking or terminating radiation production

Isocenter - Answer-Point of intersection of the three axes of rotation of the treatment
unit

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

Orthogonal - Answer--Two images taken at a 90 degrees apart
-May required for treatment planning purposes to define the location and relationship of
various anatomic structures relative to the field's isocenter

Protraction - Answer-Time over which total dose is to be delivered

, Stereoscopic Images - Answer-Two images from different angles focused on the same
point

Treatment Record - Answer-Documents the delivery of the treatments, recording
fractional and cumulative doses, machine settings, verification imaging; and the
ordering and implementation of prescribed changes

Treatment Technique - Answer-Defined method by which a treatment is delivered to the
patient

Triangulation - Answer-Treatment isocenter is located relative to three setup
coordinates on the patient's surface or on the equipment fixed relative to their anatomy

Verification Imaging - Answer-Final check that each of the planned treatment beams
does cover the tumor or target volume and does not irradiate normal tissue structures

Quality Assurance (QA) Program - Answer-A series of documentation and activities
performed with the purpose of optimizing patient care

Parallel Opposed Portal - Answer--The most basic multiple field technique.
-Two treatment fields share common central axes, 180° apart

Portal - Answer-- Aka: treatment field - the volume of tissue exposed to radiation from a
single radiation beam
- Each portal is assigned an identifier and name indicating the prescription site and
beam direction

BLUE BOX QUESTION
How are treatment field dimensions stated? - Answer-Width by length in centimeters

BLUE BOX QUESTION
What are universal precautions? - Answer-Methods of infection control in which any
human blood or body fluid is treated as if it were known to be infectious.

BLUE BOX QUESTION
How may opposing oblique or tangential fields be accommodated without rotation of the
treatment table? - Answer-By making lateral shifts of the patient (consequently
isocenter) relative to the table surface

BLUE BOX QUESTION
What is the graticule? - Answer-Calibrated device, a tray that fits into the collimator and
provides radiographic representation of the central ray, aperture size, rotation, and
magnification of the treatment aperture on the digital radiograph

Bolus - Answer-Materials that interact with the radiation beam in a way that mimics
tissue .

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