Mosby 4

Question 1

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

Answer 1

90

Question 2

kidney tolerance td 5/5 in the adult would be

Answer 2

2000 cgy

Question 3

when protons interact with matter

Answer 3

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

Question 4

you may acquire a new external contour by using

Answer 4

plaster of Paris, solder wire, CT

Question 5

breast self examinations should be performed

Answer 5

monthly

Question 6

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

Answer 6

projectile effect

Question 7

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

Answer 7

pair production

Question 8

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

Answer 8

50

Question 9

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

Answer 9

abnormal vaginal bleeding

Question 10

Co-60 and Co-57 are elements that have

Answer 10

the same number of protons but different number of neutrons

Question 11

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

Answer 11

400,000

Question 12

early stage ovarian cancer can be successfully treated with

Answer 12

surgery followed by chemo

Question 13

which part of the larynx contains the true vocal cords

Answer 13

glottis

Question 14

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

Answer 14

3% to 5%

Question 15

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

Answer 15

erythematous areas should be kept moist

Question 16

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

Answer 16

Bragg-gray cavity theory

Question 17

electron beams are useful in radiation therapy primary because they

Answer 17

have a definite range in tissue

Question 18

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

Answer 18

must be ordered by the physician

Question 19

what is the standardized barometric pressure

Answer 19

760 mmHg

Question 20

standardized temperature

Answer 20

273.2 Kelvin

Question 21

normal rectal temperature for the adult in Fahrenheit is

Answer 21

99.6

Question 22

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

Answer 22

leukemia

Question 23

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

Answer 23

nonlinear, threshold

Question 24

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

Answer 24

fiber, increasing

Question 25

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

Answer 25

photoelectric effect

Question 26

which of the following is true of Co-60 decay

Answer 26

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

Question 27

when treating opposed oblique fields for a lung tumor

Answer 27

ssds for each field should be read and documented

Question 28

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

Answer 28

radiative bremsstrahlung production

Question 29

photon production from a diagnostic X-ray tube requires

Answer 29

direct current and voltage potential

Question 30

the mass attenuation coefficient is

Answer 30

independant of density

Question 31

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

Answer 31

fewer cells

Question 32

the ___ nature of cancer cells affects their sensitivity to radiation

Answer 32

undifferentiated

Question 33

the backscatter factor depends on

Answer 33

field size and energy

Question 34

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

Answer 34

squamous cell carcinoma

Question 35

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

Answer 35

45 Gy

Question 36

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

Answer 36

pancytopenia

Question 37

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

Answer 37

50

Question 38

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

Answer 38

shock

Question 39

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

Answer 39

window level

Question 40

which modalities are commonly used for IGRT

Answer 40

CT and ultrasound

Question 41

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

Answer 41

cecum volume

Question 42

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

Answer 42

pair production

Question 43

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

Answer 43

aorta

Question 44

shoulder retractors are important for

Answer 44

pulling the shoulders out of the treatment field

Question 45

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

Answer 45

directly; inversely

Question 46

a good surface landmark for the true vocal cords is the

Answer 46

thyroid cartilage

Question 47

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

Answer 47

the transverse plane lies across the patient

Question 48

the best position for treating vertex field is

Answer 48

chin flexed

Question 49

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

Answer 49

thoracic spine