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FOR BOARDS > Mosby exam > Flashcards

Mosby exam Flashcards

1
Q

For portal verification, bone tissue contrast is better using a kilovoltage imager rather than a megavoltage imager due to the absence of:

A

screens in the MV beam

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2
Q

the most common type of leukemia in children is

A

ALL

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3
Q

the amount of kinetic energy transferred in a medium per unit mass is referred to as

A

KERMA

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4
Q

the quality factor for gamma radiation is

A

1

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5
Q

the unit of exposure in the air is the

A

Roentgen

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6
Q

which of the forces of nature is the weakest?

A

gravitational force

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7
Q

the prodromal stage of acute radiation syndrome consists of

A

nausea

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8
Q

what does the fletcher suite applicator consist of

A

tandem and a pair of ovoids

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9
Q

why is IR 192 the commonly used source in HDR after loading brachytherapy

A

it has a high specific activity and lower photon energy

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10
Q

the class of cytotoxic agents that has the potential to burn the skin of the administered is:

A

alkalizing agents

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11
Q

in one month, the output of a cobalt machine would reduce by about:

A

1%

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12
Q

what thickness of cerrobend would be equivalent to 5 cm of lead

A

6

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13
Q

the tail of the pancreas is located

A

in the hilum of the spleen

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14
Q

which of the following techniques is used to treat early pre=cancers of the cervix?

A

loops electrosurgical excision

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15
Q

linear energy transfer is measured in units of

A

keV/micrometer

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16
Q

a joule is a unit of

A

energy

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17
Q

during xray production, the process by which electrons are liberated at the cathode is known as

A

thermionic emission

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18
Q

the parathyroids are located on the

A

posterior surface of both thyroid lobes

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19
Q

for patients with bladder cancer, the preoperative radiation treatment fields should be large enough to include the bladder and regional nodes such as

A

obturator, external iliac, and internal iliac

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20
Q

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

A

photoelectric effect

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21
Q

the production of x-rays by bremsstrahlung ____ with ____ atomic number (increases/decreases)

A

increases with increasing atomic number

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22
Q

the attenuation of cerrobend is less dense than lead by about

A

15%

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23
Q

an allogenic bone marrow transplant is one in which bone marrow is

A

received from a sibling or person immunologically compatible

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24
Q

the transient sensation of electrical shock traveling down the neck and extremities following radiation to the spine is called

A

Lhermitte’s sign

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25
Q

diastolic pressure is within the arteries that exists while the heart is:

A

resting

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26
Q

suitable material for skin sparing, customized to use as a tissue compensator include all of the following except:

A

superflab

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27
Q

the most important method used to confirm malignancy is

A

histolopathological screening

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28
Q

if a healthcare worker is accidentally punctured by a contaminated needle, the potential route of disease transmission is

A

FOMITE

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29
Q

which tumor marker among the following is helpful in the diagnosis of testicular cancer

A

AFP alphafetoprotein

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30
Q

with all other factors remaining the same, increasing the field size from 6x6 to 10x10, backscatter would

A

increasing the field size increases the backscatter

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31
Q

the energy of an electromagnetic radiation is inversely proportional to it’s

A

wavelength

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32
Q

the primary lymphatic drainage for the lower lip would be to the

A

submental nodes

33
Q

Metastatic disease may lead to an abnormal accumulation of fluid in the pericardial sac. This may lead to:

A

pericardial tamponade

34
Q

A grade 1 morbidity score for the colon would indicate:

A

change in frequency of bowel habits

35
Q

if custom blocks need to be used, the shadow tray will __ the output.

A

decrease

36
Q

The natural slope of the chest may cause high dose regions in the upper mediastinum. This area of increased dose may be managed by the use of a:

A

custom compensator

37
Q

adults undergoing total body irradiation may be treated at an extended distance while assuming the position of

A

semi recumbent with the knees bent on a gurney

38
Q

if the upper mantle is treated, the arms may be elevated above the head or positioned akimbo in order to move

A

the axillary nodes away from the field

39
Q

the seven warning signs of cancer include:

A

dot——

40
Q

if a patient has a large pelvic tumor involving the bladder and prostate and there is a presacral mass, the best arrangement would be

A

opposing anterior and posterior fields

41
Q

what reduces the risk of ovarian cancer?

A

birth control pills, pregnancy, breastfeeding, tubal ligation, and hysterectomy

42
Q

a normal pulse rate in the adult is

A

60-90 bts/min

43
Q

when an actual doe delivered needs to be verified, in vivo dosimetry can be accomplished by using

A

TLDs

44
Q

if there is a serious complication during therapy, the patient could initiate legal action against:

A

the physician, the hospital, the therapist

45
Q

when treating areas in the head and neck, the most reproducible position is

A

supine

46
Q

normal rectal temperature for the adult in Fahrenheit is

A

99.6

47
Q

the systolic pressure represents

A

the highest point reached during contraction of the ventricles

48
Q

the volume larger than the treatment volume receiving some significant dose is the

A

irradiated volume

49
Q

while treating early to midstaged vulvar cancer, the patient may be positioned in the frog legged position in order to avoid

A

increased dose in the inguinal fold

50
Q

whole brain treatments are best delivered using

A

6 mV photons

51
Q

which of the following are adverse results of cachexia

A

impairment of immunities, changed in metabolism, electrolyte imbalance

52
Q

the signs of petite seizure include

A

sudden cessation of focus and response, sudden gasp or sharp vocal cry

53
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

A

beam attenuation

54
Q

if a patient is experiencing a severe reaction in the perineal area they should not

A

use hot baths to soothe the skin

55
Q

which of the following best defines a wedge factor

A

ratio of dose at depth with the wedge inserted to the dose at depth with no wedge inserted

56
Q

unsealed radioactive sources must be safely handled by

A

wearing gloves and protective clothing while working, preparing solutions in a well ventilated work area, covering work areas with plastic, glass, or stainless steel

57
Q

which type of chemotherapy is known to cause hearing loss

A

cisplatin

58
Q

an example of a non stochastic effect from radiation exposure

A

erythema

59
Q

malignant neoplasms that originate in lympho-reticular tissues are called

A

lymphomas

60
Q

a common symptom of prostate carcinoma is

A

dysuria

61
Q

the actual physical dimensions of the tumor, including regions of presumed occult spread is the

A

tumor volume

62
Q

to achieve a neutral head position for a large patient with a large, barrel chest, the therapist may use a

A

high headrest

63
Q

among the following, which of the following sites is common for the development of Ewings sarcoma

A

pelvis

64
Q

skin cells are called

A

epithelial

65
Q

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

A

45 Gy

66
Q

misalignment of treatment fields may result from all of the following except

A

dose rate change

67
Q

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

A

shock

68
Q

patients should be weighed and remeasured through the treatment axis periodically so that

A

anatomic variations can be monitored

69
Q

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

A

cecum volume

70
Q

the average energy deposited per unit path length to a medium by ionizing radiation as it passes through that medium best describes

A

a linear energy transfer

71
Q

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

A

Bragg gray cavity theory

72
Q

photon production from a diagnostic X-ray tube requires

A

direct current, voltage potential

73
Q

anaplasia describes

A

loss of differentiation

74
Q

when treating superficial lesions, a thin lead sheet with an opening for the treatment field may be placed on the patients skin for

A

field shaping

75
Q

in the maintenance phase of managing ALL, whole brain irradiation may be given with the inferior border of the treatment field at the

A

C2

76
Q

mechanical errors may be reduced by

A

performing regular quality, allowing periodic overhaul by equipment engineers, daily observation of equipment

77
Q

the ability to displace the small bowel away from pelvic fields depends on

A

whether the patient has had previous pelvic surgery

78
Q

a patient who is documented as afebrile has

A

normal body temperature

79
Q

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

A

fiber, increasing

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