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Radiation Therapy Clinical Prep Exam Questions and Answers
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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 Isocenter - Answer-point of intersection of the three axes of rotation (gantry, collimator, and base of couch) of the treatment u...

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

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  • radiation therapy clinical prep exam questions and
  • triangulation answer treatment isocenter is loc

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Radiation Therapy Clinical Prep Exam
Questions and Answers
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

Isocenter - Answer-point of intersection of the three axes of rotation (gantry, collimator,
and base of couch) of the treatment unit

X, Y, and Z planes - Answer-a 3D coordinate system;
X is the transverse axis that extends right to left,
Y is the longitudinal axis extending head to foot,
Z is the axis extending upward from the tabletop

Orthogonal images - Answer-Two images taken 90 degrees apart; required for
treatment planning purposes to define the location and relationship of various
anatomical structure relative to the field's isocenter

ODI - Answer-Optical Distance Indicator; rangefinder; it projects a scale onto the
patient's skin, which corresponds to the source distance used during the simulation or
treatment process

SSD - Answer-Source - Skin Distance; distance from the source of radiation to the
patient's skin

SAD - Answer-Source - Axis Distance; distance from the source of radiation to the axis
of rotation of the treatment unit

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

EPID - Answer-Electronic Portal Imaging Device; system producing near real-time portal
images on a computer screen for evaluation.

IGRT - Answer-Image Guides Radiation Therapy; used in a variety of forms, including
Electronic Portal Imaging Devices, in room CT scanners, kV cone beam CT, mV cone
beam CT, ultrasound and others.
Purpose: to image the patient prior to treatment and compare to treatment plan.

MLC - Answer-Multi-Leaf Collimators; part of the linear accelerator that allows treatment
field shaping and blocking through use of motorized leaves in the head of the machine

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