CTP1 Exam 2 Questions with Complete Solutions (Latest 2025) Percent Depth Dose (PDD) is defined as the dose at depth ddivided by the dose at dmax times 100.PDD=(D_depth/D_max)*100 T/F? - Correct Answers ✅TRUE
On a dose profile, the field width is defined by the: - Correct
Answers ✅50% isodose line A dose of 180 cGy prescribed to the 92% isodose line is
giving what total dose to the isocenter: - Correct Answers
✅196cGy
The wedge angle will:
- Increase with depth
- Decrease with depth
- Does not change with depth
- Increase and then decrease with depth after dmax -
Correct Answers ✅Decrease with depth
Wedges can be defined as:
- Depth at 10cm
- Depth at dmax
- Depth of the 50% line 1 / 2
CTP1 Exam 2 Questions with Complete Solutions (Latest 2025)
- Both A and C
- All of the above - Correct Answers ✅Both A and C
Factors that affect compensator isodose distributions are - Correct Answers ✅Depth Field Size Energy Shape of Compensator For an average AP/PA patient with a 20cm separation and
treated with a 6x beam will have an approximate hot spot of:
- Correct Answers ✅15%
Intregal dose should be kept as low as possible in order to minimize toxicities and can be calculated as the
ID=mass*dose:
T/F? - Correct Answers ✅True When discussion AP/PA isodose distributions, the hot spot will
increase as:
- Field size increases
- Separation decreases
- Energy increases
- / 2