CRO-CT Exam Part 9 Questions & Answers 2024/2025
Goals of simulation - ANSWERSto identify location of tumor and its relationship to surrounding anatomy
-to determine the ideal pt position
Conventional Sim - ANSWERS-pt set up in establish tx position
-field size marked on pt
-setup docume...
Goals of simulation - ANSWERSto identify location of tumor and its relationship to surrounding anatomy
-to determine the ideal pt position
Conventional Sim - ANSWERS-pt set up in establish tx position
-field size marked on pt
-setup documented
-only contour taken at central axis
-needed orthogonal images to find isocenter
-fluoroscopy
Borders - ANSWERSused to be very standardized and could include healthy tissue
Fluoroscopy - ANSWERS-live-x-ray
-push pedal and plays x-rays
-can see pts moving around
-can see them swallowing
Virtual Sim - ANSWERSCT
3D planning - ANSWERS-anatomy better visualized
-tx plans conform to true tumor vol
-increased dose to tumor and decreased dose to normal tissue
-have outlines that are diff colors for diff doses
, 5 Major advantages of CT over conventional sim - ANSWERS-better visualization of anatomy
-helps increase tx dose
-helps minimize dose to surrounding critical structures
-ability to simulate hard to verify tx portals
-DRRS allow image manipulation
Disadvantages of CT - ANSWERS-bore size can limit pts position
-loss of real time imaging
CT Sim table - ANSWERS-must be identical to tx table
-concave tables must be modified
CT Gantry - ANSWERS-has bore
-field of view (actual width of imaging capability, 20 cm less than bore size of gantry)
-pts entire anatomy must be visible from al 360 degrees
-scan as close to center of bore as possible
-make sure not to cut off any anatomy
TX planning computer - ANSWERS-shape beam to anatomy
-depict exact dose of each organ
-manipulate isodose line to get optimal tx plan
-archives treatment data
Intro of what allowed drs to increase dose - ANSWERSCT
Understanding CT images - ANSWERS-knowledge of sectional anatomy is important
-can be viewed axial, coronal and sagittal
-axial plane is most common to view in RTT
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