For Questions 23-27 refer to the following: The following is an excerpt of the c

Question

For Questions 23-27 refer to the following: The following is an excerpt of the care plan for a head and neck patient: Dose fractionation: 7000 cGy in 35 fractions over 7 weeks Dose coverage guidelines: 100% of the prescription dose to cover 95% of the PTV ii, less than 20% of the PTV to receive more than 110% of the prescription dose ii. mean dose to the PTV to be less than or equal to 105% of the prescription dose iv maximum dose of 120% of the prescription dose organs at risk tolerance guidelines: i. max point dose of 4800cGy to the cord ii mean dose of 2600 cGy to the right parotid iii, less than 50% of the right parotid to receive more than 3000 cGy The IMRT treatment plan presented to the oncologist included the following dose volume histogram: Dose Volume Histogram Tobo 2000 3000 abu 6000 7000 Dose (cGy) Q23. What percentage of the PTV gets 100% of the prescribed dose? A, 100% B 98% D. 90% Q24. What percentage of the PTV gets more than 11086 of the prescribed dose? A, 30% B. 2096 10% less than 5% D) Q25. What is the mean dose to the PTV A. 7000 cGy B) 7297.9 cGy C. 7552.6 cGy

Explanation / Answer

Sovle MCQ using given information

Q23) c) 95% .........(see dose coverage guideline (i) )

Q24) B)20% ,,,,,,,,,,,,(see dose coverage guideline (ii) )

Q25) C)7297.7cGy ......(from graph)

Q26) D)3000cGy.........(from graph)

Q27)C)2635cGy...............(mean dose of 2600cGy to the right perotid and from graph )

Q28)D)

Q29)B)

Q30)D

Q31)D

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