ASRT Exam #3

Question 1

Myelopathy can occur with radiation doses of \_\_\_\_\_ Gy using QUANTEC tables for conventional
fractionation
 20
 30
 40
 50

Answer 1

50

Question 2

Where do medulloblastomas typically metastasize to?

Answer 2

bone

Question 3

Non-small cell lung cancer commonly metastasizes to the:
Bladder.
 Liver.
 Kidney.
 Brain.

Answer 3

Brain

Question 4

When treating with multiple fields, what is TRUE regarding beam weighting?
The beam that is further from the tumor is given higher weight
Beam weighting is most useful when the target is midplane
Beam weighting is useful when treating through a sensitive structure
Beam weighting is only used when three or more fields are used

Answer 4

Beam weighting is useful when treating through a sensitive structure

Question 5

Mean survival time for central nervous system syndrome is approximately _______ days.

Answer 5

0 to 3

Question 6

The first echelon lymph node for prostate cancer is the \_\_\_\_\_\_\_\_\_\_\_\_ nodes.
Inguinal
 Obturator
 Periaortic nodes
 Presacral

Answer 6

Obturator

Question 7

Brachytherapy is administered for which of the following cancers?
Brain
 Bone
 Cervix
 Bladder

Answer 7

Cervix

Question 8

Xerostomia occurs after _________ cGy resulting in significant long-term effects.

Answer 8

1000

Question 9

In the CT scanner, movable lasers are used to do which of the following? Please select all that apply.
Display field size
 Provide isocenter position information
 Reposition the CT table
 Provide additional illumination

Answer 9

Display field size

Provide isocenter position information

Question 10

A common distant metastatic site of bladder cancer is the:
Brain.
 Colon.
 Lung.
 Kidney.

Answer 10

Lung.

Question 11

Average tissue-to-air ratio (TAR) is used when calculating monitor units for which type of treatment fields?
Rotational fields
 En face electrons
 Parallel opposed fields
 Four field box

Answer 11

Rotational fields

Question 12

The CT, or Hounsfield, number for fat is:
 -1000.
 -100.
 200.
 1000.

Answer 12

-100.

Question 13

Electron beam energy is reduced by _____ MeV per cm in unit density tissue.

Question 14

Chemotherapy is administered concurrently with radiation therapy in the treatment of:
Breast carcinoma.
 Hodgkin lymphoma.
 Lung carcinoma.
 Vocal cord carcinoma.

Answer 14

lung

Question 15

The center number of a range of CT numbers displayed in an image is referred to as the:
Window width.
 Voxel.
 Pixel.
 Window level

Answer 15

Window level

Question 16

By which two lymph node routes does ovarian cancer spread MOST often?
para-aortics and pelvic
 cervical and intramammary nodes
 para-aortics and intestinal
 pelvic and cervical

Answer 16

para-aortics and pelvic

Question 17

\_\_\_\_\_\_\_\_\_\_\_ is the ethical theory that bases decisions on individual motives and morals.
Teleology
 Consequentialism
 Deontology
 Virtue

Answer 17

Deontology

Question 18

Radiation therapy is the first line of treatment for which of the following cancers?
Leukemia
 Larynx
 Hodgkin lymphoma
 Breast

Answer 18

Larynx

Question 19

Surgical excision is the first line of treatment for carcinoma of the:
Larynx.
 Lung.
 Breast.
 Rectum

Answer 19

Breast.

Question 20

Which of the following are recommended skin care practices for patients undergoing radiation therapy to the head and neck? Please select all that apply.
Covering skin to protect from sunlight.
Use of a loofa sponge.
Application of water based lotion and creams.
If a patient needs to shave, electric razors are preferred

Answer 20

All, but loofa

Question 21

When treating with two fields 120 degrees apart, what is the most appropriate wedge angle to be used?
15 degrees
 30 degrees
 45 degrees
 60 degrees

Answer 21

30 degrees