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Rad Onc II Final Exam 2024/2025 with 100% correct answers
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Know how to acquire TBI Off Axis Measurements correct answersMeasure OAR at extended distance in phantom Magnify and scale: chamber or film difference between TBI and TMI correct answersTBI target is whole body, TMI is the skeleton with a margin TBI uses low energy x-rays, TMI is treatment wit...

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  • September 12, 2024
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  • 2024/2025
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Rad Onc II Final Exam

Know how to acquire TBI Off Axis Measurements correct answersMeasure OAR at extended distance in
phantom

Magnify and scale: chamber or film



difference between TBI and TMI correct answersTBI target is whole body, TMI is the skeleton with a
margin

TBI uses low energy x-rays, TMI is treatment with tomotherapy

TMI has less toxicities



prescription point for TBI x-rays correct answersUmbilicus



Know about isocentricity for SRS and SRT correct answersWithin a sphere radius of 1mm

Can be mechanical or radiative



how SRS can be delivered correct answersStereotactic radiosurgery: heavy charged particles, Co-60, MV
linac beam

1 fraction

fixed pin frame



the Lutz test tool when checking alignment of isocentricity correct answersUsed for stereotactic
accuracy: concentricity of the ball image within a circular field is analyzed with special magnifying
eyepiece containing a scale.

Alignment within 0.1mm



Know about fiducial boxes correct answersAttached to the frame: makes a fixed coordinate system to see
where the skull lies in the set-up. Then take a scan and create a coordinate system that is easy to fuse
with isocentric uncertainty less than 1mm

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