Raphex Therapy Exam Questions and
answers Newest RATED A+ 2025/2026
The dose received at isocenter in a CBCT prior to treatment is approximately ____ cGy - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
Answers 2-4 cGy
II! II! II! II! II! II! II!
II! for cranial stereotactic radiosurgery, accuracy and reproducibility should be on the order of
II! II! II! II! II! II! II! II! II! II! II! II!
II! ____mm - Correct Answers 2 II! II! II! II! II! II! II! II! II!
II! for an implant, for same initial dose rate, the required total activity of I-125 will be (greater or
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! less) than that needed of Ir-192 - Correct Answers greater- lower exposure rate constant
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! which isotope is created in a cyclotron? - Correct Answers F-18
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Patients can be released from the hospital when the projected dose to individuals around the
II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! patient is less than or equal to _____ - Correct Answers 5 mSv
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! In hyperthermia the tumor and its vicinity are heated using___ - Correct Answers microwave
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! radiation
II! for a 24x24 parallel opposed isocentric 6MV plan, the patient's AP thickness can be up to ____cm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! if the max tissue dose is not to exceed 110% of the dose at isocenter - Correct Answers 25
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! btw. universal and dynamic wedges, which requires more MU? - Correct Answers Universal
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! btw universal and dynamic wedges, which makes a more penetrating depth dose? - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers universal II! II! II! II! II!
, II! for which does the wedge transmission factor vary with field size? universal or dynamic? -
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Correct Answers both II! II! II! II! II! II!
II! what is the WAHA equation? - Correct Answers WA=(180-HA)/2
II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Equation for the gap on the skin surface for a pair of matched fields at some depth - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers g=(d/SAD)*(C1+C2)/2 II! II! II! II! II!
II! Equation for the RPO gantry angle given the LAO gantry angle - Correct Answers
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! RPO=LAO+180-(2xdivergence angle) II!
II! flattening filters flatten the beam at a depth of - Correct Answers 10cm II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! what two factors are important in selecting a PDD table from literature for a superficial x-ray unit?
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! - Correct Answers HVL and SSD
II! II! II! II! II! II! II! II! II! II!
II! dose under a 1.5cm width block of 5 HVL thickness in a 15x15 6MV photon beam at 5 cm depth
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! due to transmission plus scatter is approximately ____% of the dose in the open beam - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers 15% II! II! II! II! II!
II! A patient treated with 6MV tangential breast fields, the dose to the ovaries 20cm inferior to the
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! fields is approximately ___% of the prescribed dose - Correct Answers .5%
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how far from the field edge does 5% occur for a 6MV beam? - Correct Answers 2cm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how quickly are electrons attenuated in lead? - Correct Answers 2MeV/mm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how much more cerrobend is needed than lead for electrons? (%) - Correct Answers 20%
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
answers Newest RATED A+ 2025/2026
The dose received at isocenter in a CBCT prior to treatment is approximately ____ cGy - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
Answers 2-4 cGy
II! II! II! II! II! II! II!
II! for cranial stereotactic radiosurgery, accuracy and reproducibility should be on the order of
II! II! II! II! II! II! II! II! II! II! II! II!
II! ____mm - Correct Answers 2 II! II! II! II! II! II! II! II! II!
II! for an implant, for same initial dose rate, the required total activity of I-125 will be (greater or
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! less) than that needed of Ir-192 - Correct Answers greater- lower exposure rate constant
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! which isotope is created in a cyclotron? - Correct Answers F-18
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Patients can be released from the hospital when the projected dose to individuals around the
II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! patient is less than or equal to _____ - Correct Answers 5 mSv
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! In hyperthermia the tumor and its vicinity are heated using___ - Correct Answers microwave
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! radiation
II! for a 24x24 parallel opposed isocentric 6MV plan, the patient's AP thickness can be up to ____cm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! if the max tissue dose is not to exceed 110% of the dose at isocenter - Correct Answers 25
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! btw. universal and dynamic wedges, which requires more MU? - Correct Answers Universal
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! btw universal and dynamic wedges, which makes a more penetrating depth dose? - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers universal II! II! II! II! II!
, II! for which does the wedge transmission factor vary with field size? universal or dynamic? -
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Correct Answers both II! II! II! II! II! II!
II! what is the WAHA equation? - Correct Answers WA=(180-HA)/2
II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Equation for the gap on the skin surface for a pair of matched fields at some depth - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers g=(d/SAD)*(C1+C2)/2 II! II! II! II! II!
II! Equation for the RPO gantry angle given the LAO gantry angle - Correct Answers
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! RPO=LAO+180-(2xdivergence angle) II!
II! flattening filters flatten the beam at a depth of - Correct Answers 10cm II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! what two factors are important in selecting a PDD table from literature for a superficial x-ray unit?
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! - Correct Answers HVL and SSD
II! II! II! II! II! II! II! II! II! II!
II! dose under a 1.5cm width block of 5 HVL thickness in a 15x15 6MV photon beam at 5 cm depth
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! due to transmission plus scatter is approximately ____% of the dose in the open beam - Correct
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! Answers 15% II! II! II! II! II!
II! A patient treated with 6MV tangential breast fields, the dose to the ovaries 20cm inferior to the
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! fields is approximately ___% of the prescribed dose - Correct Answers .5%
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how far from the field edge does 5% occur for a 6MV beam? - Correct Answers 2cm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how quickly are electrons attenuated in lead? - Correct Answers 2MeV/mm
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
II! how much more cerrobend is needed than lead for electrons? (%) - Correct Answers 20%
II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II! II!
