Mosby 4 Flashcards
assuming ideal patient contour, the optimal hinge angle for a 45 degree wedged pair is
90
kidney tolerance td 5/5 in the adult would be
2000 cgy
when protons interact with matter
the rate of ionization increases as the proton is slowed down in matter and they recoil for nuclei
you may acquire a new external contour by using
plaster of Paris, solder wire, CT
breast self examinations should be performed
monthly
which of the following physical hazards associated with MR imaging is caused by the strong stationary magnetic field
projectile effect
which of the following photon interactions with matter involves energy being converted mass?
pair production
the field size of an x-ray or gamma ray beam is defined the area enclosed within the boundary of the ___%depth dose line
50
endometrial cancers are typically detected at an early stage. an early sign of endometrial cancer is
abnormal vaginal bleeding
Co-60 and Co-57 are elements that have
the same number of protons but different number of neutrons
in the adult, a platelet count within normal range would be approximately ___ mm3
400,000
early stage ovarian cancer can be successfully treated with
surgery followed by chemo
which part of the larynx contains the true vocal cords
glottis
what percentage of adenomatous polyps of the colon contains invasive cancer cells
3% to 5%
regarding management of skin reactions, all of the following are true except
erythematous areas should be kept moist
which theory of radiation interaction is illustrated by the operating principles of an ionization chamber
Bragg-gray cavity theory
electron beams are useful in radiation therapy primary because they
have a definite range in tissue
when caring for a patient on oxygen therapy, the therapist must remember that oxygen
must be ordered by the physician
what is the standardized barometric pressure
760 mmHg