Mosby exam

Question 1

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

Answer 1

screens in the MV beam

Question 2

the most common type of leukemia in children is

Answer 2

ALL

Question 3

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

Answer 3

KERMA

Question 4

the quality factor for gamma radiation is

Answer 4

1

Question 5

the unit of exposure in the air is the

Answer 5

Roentgen

Question 6

which of the forces of nature is the weakest?

Answer 6

gravitational force

Question 7

the prodromal stage of acute radiation syndrome consists of

Answer 7

nausea

Question 8

what does the fletcher suite applicator consist of

Answer 8

tandem and a pair of ovoids

Question 9

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

Answer 9

it has a high specific activity and lower photon energy

Question 10

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

Answer 10

alkalizing agents

Question 11

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

Answer 11

1%

Question 12

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

Answer 12

6

Question 13

the tail of the pancreas is located

Answer 13

in the hilum of the spleen

Question 14

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

Answer 14

loops electrosurgical excision

Question 15

linear energy transfer is measured in units of

Answer 15

keV/micrometer

Question 16

a joule is a unit of

Answer 16

energy

Question 17

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

Answer 17

thermionic emission

Question 18

the parathyroids are located on the

Answer 18

posterior surface of both thyroid lobes

Question 19

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

Answer 19

obturator, external iliac, and internal iliac

Question 20

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

Answer 20

photoelectric effect

Question 21

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

Answer 21

increases with increasing atomic number

Question 22

the attenuation of cerrobend is less dense than lead by about

Answer 22

15%

Question 23

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

Answer 23

received from a sibling or person immunologically compatible

Question 24

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

Answer 24

Lhermitte’s sign

Question 25

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

Answer 25

resting

Question 26

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

Answer 26

superflab

Question 27

the most important method used to confirm malignancy is

Answer 27

histolopathological screening

Question 28

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

Answer 28

FOMITE

Question 29

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

Answer 29

AFP alphafetoprotein

Question 30

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

Answer 30

increasing the field size increases the backscatter

Question 31

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

Answer 31

wavelength

Question 32

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

Answer 32

submental nodes

Question 33

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

Answer 33

pericardial tamponade

Question 34

A grade 1 morbidity score for the colon would indicate:

Answer 34

change in frequency of bowel habits

Question 35

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

Answer 35

decrease

Question 36

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:

Answer 36

custom compensator

Question 37

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

Answer 37

semi recumbent with the knees bent on a gurney

Question 38

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

Answer 38

the axillary nodes away from the field

Question 39

the seven warning signs of cancer include:

Answer 39

dot------

Question 40

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

Answer 40

opposing anterior and posterior fields

Question 41

what reduces the risk of ovarian cancer?

Answer 41

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

Question 42

a normal pulse rate in the adult is

Answer 42

60-90 bts/min

Question 43

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

Answer 43

TLDs

Question 44

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

Answer 44

the physician, the hospital, the therapist

Question 45

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

Answer 45

supine

Question 46

normal rectal temperature for the adult in Fahrenheit is

Answer 46

99.6

Question 47

the systolic pressure represents

Answer 47

the highest point reached during contraction of the ventricles

Question 48

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

Answer 48

irradiated volume

Question 49

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

Answer 49

increased dose in the inguinal fold

Question 50

whole brain treatments are best delivered using

Answer 50

6 mV photons

Question 51

which of the following are adverse results of cachexia

Answer 51

impairment of immunities, changed in metabolism, electrolyte imbalance

Question 52

the signs of petite seizure include

Answer 52

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

Question 53

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

Answer 53

beam attenuation

Question 54

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

Answer 54

use hot baths to soothe the skin

Question 55

which of the following best defines a wedge factor

Answer 55

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

Question 56

unsealed radioactive sources must be safely handled by

Answer 56

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

Question 57

which type of chemotherapy is known to cause hearing loss

Answer 57

cisplatin

Question 58

an example of a non stochastic effect from radiation exposure

Answer 58

erythema

Question 59

malignant neoplasms that originate in lympho-reticular tissues are called

Answer 59

lymphomas

Question 60

a common symptom of prostate carcinoma is

Answer 60

dysuria

Question 61

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

Answer 61

tumor volume

Question 62

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

Answer 62

high headrest

Question 63

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

Answer 63

pelvis

Question 64

skin cells are called

Answer 64

epithelial

Question 65

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

Answer 65

45 Gy

Question 66

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

Answer 66

dose rate change

Question 67

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

Answer 67

shock

Question 68

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

Answer 68

anatomic variations can be monitored

Question 69

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

Answer 69

cecum volume

Question 70

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

Answer 70

a linear energy transfer

Question 71

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

Answer 71

Bragg gray cavity theory

Question 72

photon production from a diagnostic X-ray tube requires

Answer 72

direct current, voltage potential

Question 73

anaplasia describes

Answer 73

loss of differentiation

Question 74

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

Answer 74

field shaping

Question 75

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

Answer 75

C2

Question 76

mechanical errors may be reduced by

Answer 76

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

Question 77

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

Answer 77

whether the patient has had previous pelvic surgery

Question 78

a patient who is documented as afebrile has

Answer 78

normal body temperature

Question 79

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

Answer 79

fiber, increasing