Mosby 3

Question 1

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

Answer 1

shortness of breath and/or weight exceeds the couch limit

Question 2

indian club needles have

Answer 2

one hot end

Question 3

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

Answer 3

electrons and neutrons

Question 4

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

Answer 4

consistent throughout the treatment course

Question 5

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

Answer 5

80

Question 6

which of the following equipment produces extra nuclear indirectly ionizing radiation

Answer 6

linear accelerator

Question 7

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

Answer 7

bladder

Question 8

the pituitary gland is situate in the

Answer 8

sella turcica of the sphenoid bone

Question 9

the most important method used to confirm malignancy is

Answer 9

histopathological study

Question 10

the backscatter factor depends on

Answer 10

energy and field size

Question 11

what is a nonmalignant condition treated by stereotactic radiosurgery

Answer 11

arteriovenous malformation

Question 12

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

Answer 12

500 cGy

Question 13

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

Answer 13

Phosphorus-32

Question 14

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

Answer 14

clavicle

Question 15

in a linear accelerator, microwave amplification occurs in the

Answer 15

klystron

Question 16

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

Answer 16

altered taste, sore throat, difficulty swallowing

Question 17

the use of the wedge filter helps to

Answer 17

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

Question 18

the process of cellular growth and development is called

Answer 18

proliferation

Question 19

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

Answer 19

loop electrosurgical excision

Question 20

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

Answer 20

Compton effect

Question 21

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

Answer 21

reducing the volume of oral mucosa in the field

Question 22

how many joules are in 1 electron volt

Answer 22

1.6x10^-19 J

Question 23

Bragg peak is

Answer 23

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

Question 24

between the thyroid notch and the cricoid cartilage lies the

Answer 24

larynx

Question 25

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

Answer 25

radiative bremmstralung production

Question 26

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

Answer 26

not change

Question 27

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

Answer 27

carina

Question 28

in an SSD treatment technique dose is normalized to

Answer 28

Dmax

Question 29

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

Answer 29

less exposure incident on the barrier

Question 30

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

Answer 30

4 days

Question 31

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

Answer 31

arc therapy

Question 32

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

Answer 32

10 cm

Question 33

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

Answer 33

patient position

Question 34

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

Answer 34

beam attenuation

Question 35

what factors contributes to cancer fatigue

Answer 35

pain, metabolic changes, and treatment

Question 36

Wilm's tumor originates in the

Answer 36

kidney

Question 37

the attenuation of cerrobend is less dense than lead by

Answer 37

15%

Question 38

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

Answer 38

increase

Question 39

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

Answer 39

150-450,000

Question 40

a breast bridge may be used to

Answer 40

immobilize the breast tissue

Question 41

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

Answer 41

radiolucency, low attenuation

Question 42

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

Answer 42

60 Gy

Question 43

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

Answer 43

photoelectric effect

Question 44

the unit of radiation dose REM stands for

Answer 44

roentgen equivalent in man

Question 45

the prodromal stage of acute radiation syndrome consists of

Answer 45

nausea

Question 46

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

Answer 46

vasculature

Question 47

the depth of inguinal lymph nodes

Answer 47

can range from 2-18 cm depending on patient size

Question 48

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

Answer 48

stopping power

Question 49

the French American British staging system is used to classify

Answer 49

acute leukemia

Question 50

which of the following is an example of indirectly ionizing radiation

Answer 50

neutrons

Question 51

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

Answer 51

collimators

Question 52

a fletcher-suite applicator consists of

Answer 52

tandem and a pair of ovoids

Question 53

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

Answer 53

parenteral

Question 54

a grade 1 morbidity score for the colon would indicate

Answer 54

change in frequency of bowel habits

Question 55

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

Answer 55

6 MV

Question 56

early stage ovarian cancer can be successfully treated with

Answer 56

surgery followed by chemotherapy

Question 57

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

Answer 57

30

Question 58

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

Answer 58

30

Question 59

which part of the larynx contains the true vocal cords

Answer 59

glottis

Question 60

which of the following is true of Beta+ decay

Answer 60

a proton is converted to a neutron

Question 61

light field and radiation field congruence should be checked

Answer 61

monthly

Question 62

placing marks on the central axis only is

Answer 62

insufficient for daily realignment and targeting

Question 63

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

Answer 63

50

Question 64

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

Answer 64

barometric pressure, volume of the chamber, and temperature

Question 65

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

Answer 65

tesla

Question 66

the highest dose from manmade radiation comes from

Answer 66

medical and dental use

Question 67

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

Answer 67

larynx

Question 68

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

Answer 68

bragg-gray cavity theory