CTP II Exam 2 Questions with Complete Solutions (Latest 2025) Length of Scan for Male Pelvis - Correct Answers ✅T12 to the lesser trochanter Immobilization for male pelvis - Correct Answers ✅less is more external devices cannot immobilize prostate or internal anatomy
Rectum contrast - Correct Answers ✅no contrast: easiest
and more reproducible
contrast: can assist in defining prostate/rectum interface,
have to watch for pooling, can affect volume of the rectum
LAG - Correct Answers ✅lymphangiography: good for
detecting small lymph nodes containing microscopic disease procedure is difficult, uncomfortable, and time consuming LAG with CT and MRI - Correct Answers ✅All good for identifying enlarged lymph nodes LAG-CT is better to delineate pelvic lymph nodes compared to CT or MRI alone 1 / 4
CTP II Exam 2 Questions with Complete Solutions (Latest 2025) contouring pelvic nodal region with vessels - Correct Answers ✅lymph nodes follow path of major vessels 2-3cm expansion from the vessels could be an option for
contouring: could result in inadequate CTV coverage
could also include too much normal tissue External iliac vessels - Correct Answers ✅next to external iliac vessels above iliopsoas muscle includes obturator nodes full bladder for simulation - Correct Answers ✅easier to define assist in reproducibility assist for ultrasound location assist in good planning empty bladder simulation - Correct Answers ✅worst case scenario for planning easier of patient to get through treatment 2 / 4
CTP II Exam 2 Questions with Complete Solutions (Latest 2025) bladder contrast - Correct Answers ✅helps to define the base of the prostate need to assign bulk density of urethrogram can be used to define inferior border of prostate gland bladder wall thickness - Correct Answers ✅3-5mm may have volume averaging issues
FCCC Bladder constraints - Correct Answers ✅V25: 65 Gy
V50: 40 Gy
Rectum contrast - Correct Answers ✅no contrast: easiest
and more reproducible
contrast: assist in defining prostate/rectum interface, be
careful of pooling in superior area Rectum preparation for simulation - Correct Answers ✅full
rectum: not ideal, evaluate scan and see if it needs to be re-
done
empty rectum: preferable, require a lot of work beforehand.
Reproducible? 3 / 4
CTP II Exam 2 Questions with Complete Solutions (Latest 2025) Rectum contouring - Correct Answers ✅do not include the muscle surround it.formal definition of rectum - Correct Answers ✅anal verge
- 13cm superior
clinical definition of rectum - Correct Answers ✅contour 102cm sup and inf of PTV
FCCC rectum contraints - Correct Answers ✅V17: 65Gy
V35: 40Gy
50% isodose line does not enclose entire rectum contouring the prostate - Correct Answers ✅do not contour the surrounding muscle, can use other viewing planes do not include rectal wall or seminal vesicles prostate apex location - Correct Answers ✅apex located 12-15mm superior of the urethrogram 15-20mm superior to penile bulb prostate MRI - Correct Answers ✅best delineation of prostate
- / 4