Radiation Therapy Registry Study Guide

Which is not used to achieve a uniform dose by compensating for missing or curved tissue?

A. wedges

B. shielding blocks

C. MLC

D. Bolus

C. MLC

Collimator indicator agreement checks should be performed ___ and have a tolerance of _____

monthly : 1 degree

A light/radiation field coincidence check should be performed _____ and has a tolerance of ________

monthly : 2 mm

MLC transmission should be within:

.5%

The xray output constancy measured during daily warm up procedure of a medical accelerator has a tolerance of +/- ?

3%

It is recommended that medical accelerators with arc therapy capability require dosimetry checks _____

annually

Multileaf collimators must be thick enough to reduce beam transmission through the leaf itself to less than?

2%

Mechanical accuracy for stereotactic radiosurgery with regard to isocenter displacement from the target is : +/- ?

+/- 1 mm

The recommended tolerance for CT number accuracy for water checked on a daily basis is?

+/- 5HU

Level II axillary lymph nodes lie:

under the pectoralis muscle

As SSD increases, TAR _____

remains the same

What all applies to the concept of isocenter?

- fixed reference point in space;

- couch, collimator and gantry all rotate about the isocenter;

- on a LINAC it is 100cm from the target

What factors affect the shape of the isodose curve?

- beam energy

- SSD

- Field Size

- Source Size

The central Hounsfield Unit within a group of CT numbers is known as:

Window Level

Using a system of closed circuit cameras and intercoms during radiation treatments is considered?

indirect monitoring

What type of lung cancer is centrally located in the right or left mainstem bronchus?

squamous cell carcinoma

Which studies involve ionizing radiation?

radiography, CT, Nuc Med Bone scan (Not doppler/sonography/MRI)

Ratio of dose rate with a scattering medium to the dose rate at the same point without a medium (in air) at dmax.

backscatter factor

Aka TAR at Dmax

Lymph leaving the cisterna chyli travels to the:

Thoracic Duct

During a set up of a left breast tx, the therapist did not cover up the patient's right breast. This is considered:

invasion of privacy

As SSD increases, PDD

increases

The TNM staging system assists in all of the following ways except:

the agressiveness of the tumor

In radiation therapy, there are two communication standards that are applied to the electronic medical record for transfer of data and images. those are (2 answers)

DICOM & HL7

During what gestation period would radiation most likely cause death to an embryo or fetus?

2-3 weeks and after 20 weeks

The TD 5/5 for lens of the eye is?

500 cGy

The production of free radicals in living tissue most often occurs from irradiation of

water

The para-aortic lymph nodes become the common iliac nodes at the vertebral level of

L4

The range of penetration of 12 MEV electrons is

6 cm

The addition of programmable localization lasers to a CT simulator enable the radiation oncology team to:

Choose the exact isocenter during the simulation process in order to hopefully reduce the amount of port films required on the patient's first day.

The most common subtype of renal cancer is

Clear cell carcinoma

The NCRP report No 116 recommends the total dose equivalent limit for a fetus-embryo not exceed:

5 mSv

or

0.5 rem

Which of the following cells are most radio-sensitive?

erythroblasts

Dry and/or moist desquamation typically begins to occur at doses of:

4000-6000 cGy

Transportation of radioactive materials is primarily the concern of the:

Department of Transportation

Absorbed dose at a depth divided by the dose at D/max at different distances from the radiation source is?

PDD

If you are transferring a patient from a wheelchair to the table you should?

- Put one foot slightly in front of the other

- flex your knees

- stand directly in front of the patient

Lymphatics from the buccal mucosa primarily drain into the:

submental nodes

What is the minimum thickness of cerrobend required to fabricate an electron cutout for a 15 MeV electron beam?

8.5 cm

What are the two most common sites of distant mets from colorectal cancer?

liver, lung

In the x,y, z coordinate system, the "z" represents the:

coronal plane

The NCRP report No. 116 recommends the annual public effective dose does not exceed

1 mSv

Total parenteral nutrition refers to:

tube feeding directly into the blood stream

A dose measured after passing through a block tray is measured as 97 cGy. Without the tray, the dose measured at 100 cGy. What is the tray factor?

0.97

HIPAA regulations specify that patients be verified by two forms of identification. Identify those that are acceptable.

- hospital ID bracelet

- face photo

- address

- date of birth

When creating a custom block, which of the following must be known?

- Source to tray distance

- Source to Film Distance

A health care worker being accidentally stuck by a needle that was used on an HIV patient is an example of:

indirect contact

Select all of the following that are included in the Patient's Bill of Rights?

- Right to high quality care

- Right to privacy

- Right to have help when leaving the hospital

- Right to help with billing claim

- Right to a clean and safe environment

What are the risk factors for receiving IV contrast which might cause an adverse reaction?

- Shellfish allergies

- Heart disease

- Impaired Kidney Function

- Diabetes

- Poor kidney function

-Previous reactions

Lymphatics at the base of the tongue primarily drain to the:

jugulodiagstric node

Select all the apply to the fabrication of individualized immobilization devices:

- must be reproducible

- the position should be stable

The tumor volume that can be seen on imaging plus a margin for microscopic disease is known as the:

CTV

What size margins should be considered for simulation and treatment of soft tissue sarcoma?

2-3 cm

Identify techniques used to move the small bowel out of the treatment field

- Full Bladder

- Use of belly board

The intervention of choice for early stage seminoma is:

inguinal orchiectomy

A patient receiving radiation that has a pacemaker should have a physics consultation:

always

The TD 5/5 to the spinal cord is:

45 Gy

Identify the characteristics of informed consent

- in case of emergency implied consent is acceptable but must be obtained in writing as soon as possible after treatement

- patients on narcotic medications are considered incompetent

The umbilicus is located approximately at the level of

L4

Which of the following statements regarding portal imaging is not correct?

The therapists must approve each film

(The correct statements are: Its a means of QA, its a means of documentation, and it is part of the RT treatment record)

Which of the following ingredients in cerrobend is toxic?

Cadmium

What treatments are most often used for patients with prostate cancer?

surgery, brachytherapy, XRT, proton therapy

(NOT chemo)

What is the benefit of having radiation therapy to H&N region as opposed to surgery?

improved cosmesis

Which type of leukemia has the worst prognosis?

CML (chronic Myeloid Leukemia)

What type of foods should a colorectal CA patient eat?

Fruits, Vegetables, Low Fiber

The dose limit for the lens of the eye for the public is?

1.5 rem. Or 15 mSv

A radioactive sample is measured to contain 1000 mCi of radioactivity. If the decay constant of this isotope is 0.105 hr -1, how much activity will remain after 48 hours?

6.474 mCi

All of these are true about the treatment couch/couch assembly except:

made of carbon fiber that is strong, light, and has a high attenuation

Which of the following is the most effective method of sterilization?

moist heat

The TD 50/5 for the optic nerve is approximately ____ Gy

65

A patient can be released after a brachytherapy procedure if the total effective dose equivalent to any other individual is not to exceed:

5 mSv

The maximum allowed radiation exposure in this type of area would be less than 1mSv/yr or 2mrem/wk:

Unrestricted Area

Which of the following would be an appropriate way to dispose of radioactive waste?

All of the above (Incineration, Burial, Transfer to an authorized recipient)

Which of the following cell types are likely to express radiation injury shortly after a D0 dose of radiation is received? (Select 2)

VIM & DIM

Melanocytes are found in which layer of the skin?

Basale

What are a family of isodose curves?

Isodose Chart

When considering the construction of protective barriers, the workload (W) indicates:

How much the primary beam is in use.

Mayneord F Factor is used in which of the following?

SSD setups when distance increases

What are chemical substances that inhibit the growth of pathogens?

antiseptics

What type of communication can indicated how a patient is feeling faster?

Non-verbal

Informed consent must be secured:

In writing

Professional ethics may be defined as:

Standards that guide a radiation therapist's course of action during their workday

What is the dose rate limit for a high radiation area?

>100 mrem/hr

Gantry angles:

A. The same at different facilities

B. Must be accurate to 5 degrees

C. Are checked on a daily basis

D. None of these

none of these

Paralanguage refers to

Sound of speech rather than content

Types of consent include which of the following?

Simple, Expressed, Implied

What is a PSA test most useful?

After treatment

Increasing the collimator setting:

Increases scatter

Example(s) of positioning aids include:

Knee sponges, bite blocks, shoulder pulls (Not lasers or tattoos)

Which is not an element of self concept?

Belief

A calibrated device used to determine distance increments is called:

Graticule

1 Gy is equal to which of the following?

1 J/kg

What dose causes permanent xerostomia?

4000 cGy

The total time over which treatment is protracted is called:

Elapsed Days

How can patients care for dry desquamation?

Aquaphor (Not silvadine)

Choose all that applies: Which of the following can be linked to esophageal cancer?

A. Lye ingestion

B. Tobacco

C. Alcohol Ingestion

D. Cured Meat

E. Hot liquids

F. Low Protein/low calorie diet

All of the above

What is the weakest link in radiation therapy?

reproducibility

What is the number one in cancer incidence in men in the United States?

Prostate

The ethical principle that refers to honesty in all aspects of one's professional life is:

Veracity

How does leukemia affect CBC's?

Producing too many WBCs

The most common symptom of a Wilm's tumor is?

Abdominal Mass