PCE Mock

if planning a 120 degree arc as the sole treatment beam, where would you expect high dose zone to fall

anterior to tumor

in general, what margin is needed distal and proximal to a soft tissue sarcoma

5cm

what margin is needed distal and proximal to as esophageal cancer

5cm

where does the spinal cord start and stop in normal adults

C1 to L2

what anatomical landmark does CSF stop flowing

S2

how do you determine the practical range of an electron beam

divide energy by 2

mayneord F factor calculation corrects for which set up factor (energy, field size, depth, or distance)

distance

for radiation workers, the occupational dose is usually reported in what unit

mSv

where are pancoast tumors located

apices/top of lung

the most radioresistant stage of the cell cycle is what

S

the point of intersection of the collimators and the gantry axis of rotation is called

isocenter

what do you call an infection that is caused by hospital employees/hospital environments

nonsocomial

the patient’s seperation is 30cm. if the posterior SSD is 89, what is the anterior SSD

80cm

during convulsive seizure, the most important action to be taken by the therapist is

keep the pt safe (pillow under the head)

the term that best describes the complete removal of all microorganisms is

sterilization

what tool would be most valuable in preventing the spread of airborne droplet infections

mask

what is the best way to prevent infection

hand washing

what medical apparatus should normally remain below the level of the patient at all times

catheter foley bag

what medical apparatus should normally remain ABOVE the level of the pt at all times

IV bags

what does it mean when i say the patient is receiving hyperalimentation

feeding by IV injections

patients who are neutropenic often present with this condition

infection

when treating the whole brain, what type drug would be used to reduce edema

decadron

which chemotherapy drug is known to cause significant risk of cardiac toxicity

doxorubicin

written defamation of character is best known as

libel

the most common long term effect of radiation therapy to the lung is

fibrosis

after what period would fibrosis generally appear following standard external beam theapy

6mo-1yr

the term for low white count is

leukopenia

restraining a pt in a thermoplastic mask without consent could be considered

false imprisionment

MV portal films taken on a megavoltage machine have much less contrast than KV films bc of what

scatter

if working in podunk, where they do not have ASJ, what would happen to isocenter if 1.5cm was added to the inferior border of a treatment port

isocenter moves 0.75cm inferior

the standard amount of time that should elapse between two radiation therapy treatments given in the same day to the same site is

6hrs

what does MSDS stand for

medical safety data sheets

if the SSDs on a four field pelvis are ant 91, post 87, right lat 82, adn the left lat 85, what are the patient’s diameters

ant/post = 22cm; lateral = 33cm

according to ICRU terminology, what do we call the area that is defined as the palpable or visible extent of the malignant tumor

gross tumor volume (GTV)

what is the dose at dmax is 200cGy is delivered to a depth of 7cm, and the PDD is 72%

277cGy

to preserve skin sparing properties of an MV beam, cerrobend blocks and compensators should be placed at least this distance from the pts skin

15cm

two wedges are used to treat a maxillary antrum tumor an anterior and lateral port. What part of the wedges should be adjacent

anterior: toes are adjacent

laterals: heels are adjacent

what is the most common potent chemical modifer of radiosensitivity to x and gamma radiation

add oxygen

when treating tissue known to be hypoxic/anoxic, what type of radiation would be most effective

protons

for treatment of bladder cancer, the bladder should be _ during treatment of entire bladder as target volume

empty

the organization that publishes '“task groups” reports

AAPM

two common presenting symptoms of vena cava syndrome are

cyantosis and distended veins

the practical range of a 6MeV electron beam is

3

what is the largest salivary gland in the head and neck

parotid

a treatment of 137 monitor units requires that a blocking tray factor of .963 be included in the calculations. what are the correct monitor units

142MU

if a patient received a tumor dose of 250cGy per day at the 79.2% depth dose, what is the daily maximum dose

315cGy

what is the equivalent square of the resultant field of a 12×12 field with a 4×6 block in corner of field

11 × 11

the depth of dmax is most dependent upon what

energy

what would divide an electron energy by to estimate the 90% isodose range

4

a strontium-90 applicator may be useful in the treatment of what eye condition

pterygium

what is the most common pathology for endometrium cancer

adenocarcinoma

what type of lung cancer has the highest incidence of metastases at presentation

small cell

what is the technique in which a skin cancer is removed and examined one layer at a time

moh’s surgery

why is the patient’s chin tilted down when treating a pituitary gland

to keep eyes out of the field

at what vertebral body location is the xiphoid

T9-T10

the inferior border of the larynx port for a vocal cord carcinoma should be at what location

C6

the collapse of a part of or all of the lung, which is often results from bronchial obstruction is called what

atelectasis

based on external anatomy, what is the location of the pituitary

anatomically, where is the pituitary located

in the sella turcica

the trachea bifurcates at the level of what vertebral body

T4-T5

what anatomic landmark can be used to locate the carina

T5

in what quadrant is the liver located

RUQ

what term is used to identify the degree of cellular differentiation and rate of tumor growth

grade

when treating the entire CNS axis, the bottom of the spine port generally extends to include the cauda equina by extending to what level

S2

the common iliac nodes are generally found around what level of vertebral bodies

L4-L5

in what quadrant is the spleen located

LUQ

what external landmark can be used to localize the top of the larynx

hyoid bone

in what region of vertebral bodies (C,T, or L) is spinal cord compression most common

T

if a pathology report indicates a stage of T2, NO, M3, what can be said about the lymph node status

no nodal involvement

the most common type of breast cancer

infiltrating ductal carcinoma

in the normal patient anatomy, where does the prostate sit in relationship to the bladder

inferior to bladder

the lower, narrowed portion of the uterus is called what

cervix

the vocal cords are found within what anatomic structure

larynx

what cancer may need prophylactic brain treatment

small cell lung cancer

what cancer may need prophylactic irradiation of testes

leukemia

what cancer is “peau de orange” associated with

breast cancer

the largest lymphoid tissue is where

spleen

the epiglottis is a flap of cartilage that folds back to cover the entrance of what structure

larynx

hypo-fractionation is treatment given how

less fx, higher dose each fx

the most common site for mets spread for cancer of the penis

inguinal nodes

into what lymph node group does breast cancer most often spread

axillary nodes

when patient presents with bloody nasal discharge and a neck mass at the JD node, what diagnosis would you expect

nasopharyngeal tumor

from what type of tissue do most sarcomas arise

connective tissue

what is the purpose of the scattering foil in a linear accelerator

to spread out the electron beam for a more uniform dose

each month, the output of a Co60 machine well reduce by what factor

about what size is the focal spot size for a linear accelerator

2-3mm

electromagnetic waves are produced here before being sent to the accelerator guide in a linac

trimmer bars attached to the collimator are used to reduce the effects of what

pneumbra

what is the best absorbing material for neutrons

who is responsible for acceptance testing and commissioning of a treatment planning system

physicist and the vendor

one Gy is equal to how many cGy

100cGy

the formula used to calculate equivalent square is called, and wha tis the formula

sterling’s formula; 4(A/P)

the depth of dose maximum in a patient for kv xrays is

0 or at the skin (surface)

what is recommended depth for calibration of an accelerator photon beam

10cm

for what purpose would a dosimetrist use Clarkson’s method of calculation

the clearance between the patient skin surface and the collimator accessories is required why

collision w the pt and distance for scatter

what is the approximate primary transmission for a block used to shield a portion of the field

what is the thickness of blocks used for field blocking in HVLs

custom blocks, prepared to incorporate beam divergence, reduce what type of pneumbra (transmission or geometric)

transmission

what thickness of lead would you use with 10MeV electron beam