CTP1 Exam 1 Questions with Complete Solutions (Latest 2025) GTV vs CTV vs PTV - Correct Answers ✅GTV- Gross target (tumor) volume -area of proven disease -gross palpable or visible -malignant and mAcroscopic Unless it's prostate CA which is whole prostate CTV - Correct Answers ✅CTV- Clinical target (tumor) volume -GTV plus mIcroscopic margin -may include nodes and distant spread of disease -anatomical-clinical volume
- fixed or variable margin around for example
CTV=GTV+1cm margin PTV - Correct Answers ✅PTV- Planning target (tumor) volume
-CTV plus margin to account for:
-set up error -patient motion -localization of critical structures -static geometric volume- fixed volume in space 1 / 3
CTP1 Exam 1 Questions with Complete Solutions (Latest 2025)
- ICRU 50 - Correct Answers ✅ICRU 50-prescribing,
recording, and reporting photon beam therapy. Making therapy standardized for protocols and transfering from different centers. WK2 slide 2 ICRU 62 - Correct Answers ✅ICRU 62- internal margin added to the CTV (microscopic and IM) which is motion that occurs from breathing or digestive. Also wt loss or gain, and setup margins. Purpose is to tighten margins to you confidently tx the correct area. "90% of patients must get a minimal CTV dose of 95% or more." HW2 ICRU 50 and 62 address standardization of contours and prescription reporting? - Correct Answers ✅TRUE What does TNM stand for? - Correct Answers ✅The TNM Staging System is based on the extent of the tumor (T), the extent of spread to the lymph nodes (N), and the presence of metastasis (M). The T category describes the original (primary) tumor TNM Staging stage0 - stage 4 - Correct Answers ✅-Stage 0 carcinoma in situ.-Stage 1 cancers are localized to one part of the body -Stage 2 cancers are locally advanced 2 / 3
CTP1 Exam 1 Questions with Complete Solutions (Latest 2025) -Stage 3 cancers are also locally advanced. Whether a cancer is designated as a Stage 2 or Stage 3 can depend on the specific type of cancer;late locally advanced -Stage 4 cancers have often mets, or spread to other organs or throughout the body TNM stages (T, N, M,) - Correct Answers ✅T- primary
tumor: TX= cannot be evaluated, T0= no evidence,
Tis=carcinoma in situ, T1-T4= size and/or extent
N-regional lymph nodes: NX= cannot be evaluated, N0= no
involvement, N1-N4=number of lymph nodes and/or extend of spread
M-distant metastasis: MX= cannot be evaluated, M0= none,
M1= distant metastasis is present Immobilization - Correct Answers ✅-comfortable, reproducible, minimal beam attenuation, affordable geometric edge - Correct Answers ✅The geometric edge of a treatment field is usually defined by the 50% isodose line distance between the 50% and 95% isodose lines is, in most linear accelerators, approximately 5mm.Setup Accuracy for Frames and body fix - Correct Answers ✅
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