Radiation Therapy EXAM QUESTIONS WITH DETAILED VERIFIED ANSWERS RATED A+

Radiation Therapy EXAM QUESTIONS WITH DETAILED VERIFIED ANSWERS RATED A+ Three principle modalities used in cancer treatment: - Answer- 1. Rad Oncology (therapy) 2. Surgery 3. Chemotherapy 4. Immuno Therapy Radiation Therapy - Answer- Is the use of ionizing radiation in the treatment of patients with benign and malignant disease Goals of treatment: - Answer- -Precisely deliver a cancercidal dose of radiation to a defined tumor volume -limit the dose to normal healthy tissue Who is involved with radiation therapy for patients: - Answer- Radiation Oncologist Radiation Physicist Radiation Therapist Medical Dosimetrist Radiation Oncologist: - Answer- prescribes the *quantity* of radiation and determines the anatomic region(s) to be treated is concerned with the causes, prevention, and the treatment of the cancer involving special expertise in the therapeutic sue of radaition therapy, either alone or in conjunction with surgery, chemotherapy, biotherapy, heat, or oxygen Radiation Physicist: - Answer- calibrates and maintains the radiation-producing equipment; helps doctor w/ dose calculations Radiation Therapist: - Answer- obtains images that localize the treatment area; administers the treatments, records the dose delivered each day, and monitors the patient's physical and emotional well-being Medical Dosimetrist: - Answer- devises plan for delivery of the treaments to best kill the tumor and protect normal tissue Wilhelm Roentgen - Answer- describe the x-ray in 1895 when he passed a current through the Crookes' tube covered by black card board and produced a ray on paper Henri Becquerel - Answer- Discovered the natural radioactivity of uranium Marie and Pierre Curie - Answer- Discovered radium in 1898 1922 - Answer- Deep therapy xray machines were available for treating patients 1950 - Answer- Cobalt-60 machine and the linear acclerator Rad - Answer- The unit of absorbed dose Rad - Answer- cGy Gray - Answer- Replaced rad as the international standard measure of radiation dose Gy - Answer- .01 X-RAY - Answer- External x-ray electrical Teletherapy Change the tube for x-ray create a photon 1930 Van De Graff- 2.5 MeV, 3 MeV Radium - Answer- Internal Decay brachytherapy Distance therapy Radionucleoids Cs 137 In 192 Co 60 - 1.25 MeV- .5 cm Dmax gamma rays I 125 Pd 123 Dmax - Answer- Depth of the maximum build up, in which 100% of the dose is deposited beneath the skin Radium - Answer- Was on the skin surface, if deep seeded wouldn't treat the tumor very well. Less than 1MeV (.66MeV) Radiation Therapy may be used for: - Answer- -Cure -Pallitive Care How does radiation kill cells primaryily - Answer- By damaging the DNA, directly or indirectly Indirectly damaging DNA - Answer- caused when ionizing radiation interacts with the cell's water to produce free radicals, these are highly reactive and can cause the breakage of DNA Directly damaging DNA - Answer- Hits the DNA directly and kills the DNA, so it can not replicate Fractionation is: - Answer- the delivery of small doses daily until entire treatment dose is reached