ONS Radiation Therapy Certificate - Section 3 (Treatment) Exam Questions and Answers 100% Pass

ONS Radiation Therapy Certificate - Section 3 (Treatment) Exam Questions and Answers 100% Pass Goal of radiation - Correct Answer ️️ -- to irradiate a predefined target volume while minimizing exposure to adjacent normal tissues. - Radiation oncologists and medical oncologists collaborate to determine overall goals and treatment approaches. - Multiple diagnostic procedures are employed to define the tumor volume and prescribe the correct dose of radiation. - Radiation physicists, dosimetrists, oncologists, and therapists use sophisticated hardware and software to model geometric and dosimetric planning to ensure quality and accuracy. dosimetrist - Correct Answer ️️ -part of radiation therapy team who calculates the absorbed dose of radiation in matter and tissues Successful treatment - Correct Answer ️️ -depends upon accurate writing and interpretation of the radiation prescription. treatment volume - Correct Answer ️️ -- the area that requires direct irradiation. GTV - Gross tumor volume - Correct Answer ️️ -The visible tumor - the malignant growth that is felt or seen on imaging CTV - Clinical tumor volume - Correct Answer ️️ -The tissue that includes the GTV and the microscopic malignant tissue PTV - Planning target volume - Correct Answer ️️ -The additional margins added to CTV to account for the pt movement, tumor growth, and inaccuracies in calculations treated volume - Correct Answer ️️ -the volume enclosed by an isodose surface that is determined by the RO to be appropriate for the tx of this person and condition - 95% isodose surface isodose - Correct Answer ️️ -radiation dose of equal intensity to more than one body area irradiated volume - Correct Answer ️️ -the volume that receives a dose significant in relation to normal tissue tolerance Organs at risk (OARs) - Correct Answer ️️ -normal tissues whose radiosensitivity and location may determine the course of treatment planning. ICRU 50 - reference point - Correct Answer ️️ -the point that should be in the central part of the PTV. It should be unambiguous, accurately determined, and clinically relevant. Dose volume histograms (DVHs) - Correct Answer ️️ -complex models used in the reporting and evaluating of 3D radiotherapy dose distribution planning - Correct Answer ️️ -ensures the most accurate delivery of the most accurate dose, and includes: Determining patient positioning/immobilization to ensure consistent positioning throughout treatment course Data from computed tomography, magnetic resonance imaging, positron emission tomography, and manual contouring Definition of the treatment volumes and the OARs The design of the treatment (type of radiation, any modifiers