Mosby 4 Flashcards

1
Q

assuming ideal patient contour, the optimal hinge angle for a 45 degree wedged pair is

A

90

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2
Q

kidney tolerance td 5/5 in the adult would be

A

2000 cgy

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3
Q

when protons interact with matter

A

the rate of ionization increases as the proton is slowed down in matter and they recoil for nuclei

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4
Q

you may acquire a new external contour by using

A

plaster of Paris, solder wire, CT

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5
Q

breast self examinations should be performed

A

monthly

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6
Q

which of the following physical hazards associated with MR imaging is caused by the strong stationary magnetic field

A

projectile effect

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7
Q

which of the following photon interactions with matter involves energy being converted mass?

A

pair production

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8
Q

the field size of an x-ray or gamma ray beam is defined the area enclosed within the boundary of the ___%depth dose line

A

50

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9
Q

endometrial cancers are typically detected at an early stage. an early sign of endometrial cancer is

A

abnormal vaginal bleeding

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10
Q

Co-60 and Co-57 are elements that have

A

the same number of protons but different number of neutrons

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11
Q

in the adult, a platelet count within normal range would be approximately ___ mm3

A

400,000

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12
Q

early stage ovarian cancer can be successfully treated with

A

surgery followed by chemo

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13
Q

which part of the larynx contains the true vocal cords

A

glottis

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14
Q

what percentage of adenomatous polyps of the colon contains invasive cancer cells

A

3% to 5%

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15
Q

regarding management of skin reactions, all of the following are true except

A

erythematous areas should be kept moist

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16
Q

which theory of radiation interaction is illustrated by the operating principles of an ionization chamber

A

Bragg-gray cavity theory

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17
Q

electron beams are useful in radiation therapy primary because they

A

have a definite range in tissue

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18
Q

when caring for a patient on oxygen therapy, the therapist must remember that oxygen

A

must be ordered by the physician

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19
Q

what is the standardized barometric pressure

A

760 mmHg

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20
Q

standardized temperature

A

273.2 Kelvin

21
Q

normal rectal temperature for the adult in Fahrenheit is

A

99.6

22
Q

mucositis is more likely to occur in which of the following malignant conditions

A

leukemia

23
Q

what type of dose response model applies to MR to address biologic effects of the magnetic fields used to image patients

A

nonlinear, threshold

24
Q

reductions in ___ intake have coincided with ___ rates in colon cancer

A

fiber, increasing

25
Q

the use of iodine or barium contrast in CT scanning exploits the characteristics of

A

photoelectric effect

26
Q

which of the following is true of Co-60 decay

A

excess energy is given off as two gamma rays of discrete energies

27
Q

when treating opposed oblique fields for a lung tumor

A

ssds for each field should be read and documented

28
Q

the basic types of interaction between x-radiation and matter include all of the following except

A

radiative bremsstrahlung production

29
Q

photon production from a diagnostic X-ray tube requires

A

direct current and voltage potential

30
Q

the mass attenuation coefficient is

A

independant of density

31
Q

it is important to detect a neoplasm early, when it is small, because smaller tumors show

A

fewer cells

32
Q

the ___ nature of cancer cells affects their sensitivity to radiation

A

undifferentiated

33
Q

the backscatter factor depends on

A

field size and energy

34
Q

which histological type would a tumor of the larynx likely be?

A

squamous cell carcinoma

35
Q

total dose to the lumpectomy site following accelerated partial breast irradiation utilizing high dose rate brachytherapy will be approximately

A

45 Gy

36
Q

chemotherapy related side effect characterized by a decrease in MANY cellular components of the blood is

A

pancytopenia

37
Q

if radiation is used preoperatively for the management of colon cancer, the total tumor dose would be __ Gy

A

50

38
Q

the tredelenberg position is appropriate for a patient experiencing a medical emergency such as

A

shock

39
Q

which of the following factors influences brightness of an image displayed on a viewing monitor

A

window level

40
Q

which modalities are commonly used for IGRT

A

CT and ultrasound

41
Q

when treating a patient with prostate cancer, which of the following factors would not cause prostate movement

A

cecum volume

42
Q

which photon interaction with matter involves direct photon interaction with the nucleus

A

pair production

43
Q

the pulse in the adult is most commonly evaluated at all the following sites except

A

aorta

44
Q

shoulder retractors are important for

A

pulling the shoulders out of the treatment field

45
Q

cellular radiosensitivity is __ proportional to the rate of cell division and ___ proportional to the degree of cell differentiation

A

directly; inversely

46
Q

a good surface landmark for the true vocal cords is the

A

thyroid cartilage

47
Q

in the usual orientation of the three planes with respect to the patient

A

the transverse plane lies across the patient

48
Q

the best position for treating vertex field is

A

chin flexed

49
Q

which of the following sites is most likely to show bone metastasis

A

thoracic spine