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FOR BOARDS > Mosby 3 > Flashcards

Mosby 3 Flashcards

1
Q

the therapist may see a patient treated in the seated position because of

A

shortness of breath and/or weight exceeds the couch limit

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2
Q

indian club needles have

A

one hot end

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3
Q

dense metal accessories should be placed at a suitable distance from the patients skin surface in order to prevent contamination from secondary

A

electrons and neutrons

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4
Q

during radiation treatment to the thorax, the arm position should be

A

consistent throughout the treatment course

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5
Q

beam symmetry and flatness are defined over what percentage of the field

A

80

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6
Q

which of the following equipment produces extra nuclear indirectly ionizing radiation

A

linear accelerator

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7
Q

a low residue diet would be recommended for the patient receiving radiation to the

A

bladder

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8
Q

the pituitary gland is situate in the

A

sella turcica of the sphenoid bone

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9
Q

the most important method used to confirm malignancy is

A

histopathological study

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10
Q

the backscatter factor depends on

A

energy and field size

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11
Q

what is a nonmalignant condition treated by stereotactic radiosurgery

A

arteriovenous malformation

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12
Q

the td 5/5 for the lens of the eye is

A

500 cGy

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13
Q

which of the following radioisotopes is sometimes administered into the peritoneal cavity in the treatment of gynecological malignancies

A

Phosphorus-32

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14
Q

a good surface landmark to approximate the apex of the lung is

A

clavicle

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15
Q

in a linear accelerator, microwave amplification occurs in the

A

klystron

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16
Q

a patient undergoing treatments to the oral cavity and oral pharynx will experience

A

altered taste, sore throat, difficulty swallowing

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17
Q

the use of the wedge filter helps to

A

achieve a more homogenous dose distribution, compensate for the absence or presence of tissue, avoid hot spots

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18
Q

the process of cellular growth and development is called

A

proliferation

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19
Q

what technique is used to treat early pre-cancers of the cervix

A

loop electrosurgical excision

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20
Q

which of the following radiation interactions with matter occur independently of atomic number

A

Compton effect

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21
Q

bite block systems may be used in head and neck irradiation for the purpose of

A

reducing the volume of oral mucosa in the field

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22
Q

how many joules are in 1 electron volt

A

1.6x10^-19 J

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23
Q

Bragg peak is

A

maximum ionization near the end of the range of a heavy, charged particle

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24
Q

between the thyroid notch and the cricoid cartilage lies the

A

larynx

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25
Q

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

A

radiative bremmstralung production

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26
Q

increasing the dose rate on a linear accelerator will ___ the percent depth dose

A

not change

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27
Q

the treatment field for a right upper lobe tumor has the central axis at the level of the sternal angle. the verification port will likely show the central axis at about the level of the

A

carina

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28
Q

in an SSD treatment technique dose is normalized to

A

Dmax

29
Q

the greater the distance between the radiation source and the barrier, the

A

less exposure incident on the barrier

30
Q

radon is a natural radioactive gas with a half-life of

A

4 days

31
Q

a method of radiation therapy in which the source is moved around the patient, but only through certain sectors of a circle is called

A

arc therapy

32
Q

the range in water of a 20 MeV electron beam is approximately

A

10 cm

33
Q

the record and verify system is intended to do all of the following except verify the

A

patient position

34
Q

lucite is often used as the material for positioning devices. one major concern when this material is in the path of the treatment beam is

A

beam attenuation

35
Q

what factors contributes to cancer fatigue

A

pain, metabolic changes, and treatment

36
Q

Wilm’s tumor originates in the

A

kidney

37
Q

the attenuation of cerrobend is less dense than lead by

A

15%

38
Q

increasing the field size from 5x5 to 20x20, with all other factors remaining the same, the percent depth dose will

A

increase

39
Q

in the adult, a platelet count within normal range would be approximately __mm^3

A

150-450,000

40
Q

a breast bridge may be used to

A

immobilize the breast tissue

41
Q

the preferred material for the patient couch as part of the CT simulator or linear accelerator is carbon fiber. this material is preferred due to its

A

radiolucency, low attenuation

42
Q

the tolerance dose (TD 5/5) for the optic chiasm

A

60 Gy

43
Q

in radiation therapy, which of the following interactions with matter are least important

A

photoelectric effect

44
Q

the unit of radiation dose REM stands for

A

roentgen equivalent in man

45
Q

the prodromal stage of acute radiation syndrome consists of

A

nausea

46
Q

in primary bone tumors, the primary mode of distant metastasis is through

A

vasculature

47
Q

the depth of inguinal lymph nodes

A

can range from 2-18 cm depending on patient size

48
Q

the rate of kinetic energy lost per unit path length is referred to as

A

stopping power

49
Q

the French American British staging system is used to classify

A

acute leukemia

50
Q

which of the following is an example of indirectly ionizing radiation

A

neutrons

51
Q

electron contamination of high energy photon beams may result from photon interactions with the

A

collimators

52
Q

a fletcher-suite applicator consists of

A

tandem and a pair of ovoids

53
Q

the type of nutrition that bypasses the gastrointestinal tract and introduces nutrients into the veins is called

A

parenteral

54
Q

a grade 1 morbidity score for the colon would indicate

A

change in frequency of bowel habits

55
Q

the most likely photon beam energy used to treat areas in the head and neck would be

A

6 MV

56
Q

early stage ovarian cancer can be successfully treated with

A

surgery followed by chemotherapy

57
Q

A patient treated with two fields separated by 120 degrees, likely needs a __ degree wedge inserted for even dose distribution

A

30

58
Q

a 30 year old radiation worker would be allowed __ rem whole-body cumulative exposure

A

30

59
Q

which part of the larynx contains the true vocal cords

A

glottis

60
Q

which of the following is true of Beta+ decay

A

a proton is converted to a neutron

61
Q

light field and radiation field congruence should be checked

A

monthly

62
Q

placing marks on the central axis only is

A

insufficient for daily realignment and targeting

63
Q

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

A

50

64
Q

when calibrating ion chambers, which of the following correction factors are needed

A

barometric pressure, volume of the chamber, and temperature

65
Q

which SI unit of measure expresses the strength of the magnetic field during MRI

A

tesla

66
Q

the highest dose from manmade radiation comes from

A

medical and dental use

67
Q

squamous cell carcinoma would be the likely histological classification for a malignant growth in the

A

larynx

68
Q

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

A

bragg-gray cavity theory

FOR BOARDS (23 decks)

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