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Radiation Therapy Calculations Exam Questions and Answers
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  • Course
  • Radiation therapy
  • Institution
  • Radiation Therapy

If the field size is 10x15 at 100cm, what is it on a port film at 125cm? - Answer- Setup for Entire Femur: Largest field length at 100cm is 40cm • Need 56cm length • What would be the SSD required? - Answer-140cm SSD What is the gap needed between two adjacent fields to a depth of 6cm....

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  • October 7, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • radiation therapy calculations exam questions and
  • if the field size is 10x15 at 100cm what is it on

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  • Radiation therapy
  • Radiation therapy

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Radiation Therapy Calculations Exam
Questions and Answers
If the field size is 10x15 at 100cm, what is it on a port film at 125cm? - Answer-

Setup for Entire Femur:
Largest field length at 100cm is 40cm
• Need 56cm length
• What would be the SSD required? - Answer-140cm SSD

What is the gap needed between two adjacent fields to a depth of 6cm. The field
lengths of the fields are 8cm
and 20cm, respectively at 100cm SSD? - Answer-

If the Intensity at 100cm is 200cGy, what is the
Intensity at 50cm? - Answer-

What is the equivalent square of a 10 x 14 cm field size? - Answer-FS eq. = 11.667 cm

A 10 x 14 cm field size has a 2 cm square blocked on one side, and another 3 cm
square contralaterally. What is the field size equivalent of the 10 x 14 cm rectangle? -
Answer-FS eq. = 4x(A/P)
Area = (1014)−(22)−(33)
Perimeter =8+2+2+12+7+3+3+11

FS 10.58 cm

Calculate the MU necessary to deliver
200cGy to a depth of 3cm
(PDD value = 95.1%)
10x10 field size 6Mv Linac
100cmSSD
Reference Dose Rate at 101.5cm from source
is 1.0cGy/monitor unit - Answer-210.3 MU

For a 6Mv beam, what is the dose
to the depth of 5cm when the dose at 3cm is
200cGy?
• PDD value at D3 = .951
• PDD value at D5 = .876 - Answer-• To calculate the dose at some point along
the central axis - use direct proportion.
• (Dose at Point A / PDD at Point A) = (Dose at Point B / %DD at Point B)

x = 184.23 cGy

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