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CTMT2336 Ch 10 Exam Latest Update
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CTMT2336 Ch 10 Exam Latest Update
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CTMT2336 Ch 10 ExamLatest Update
True or False
Factors directly affecting CT dose cannot be controlled by the technologist. - Answer
False
Direct factors are those factors that increase or decrease the dose to the patient and
are under the direct control of the technologist.
True or False
The DLP is directly proportional to the scan length. - Answer True
True or False
The method suggested by the Center for Devices and Radiological Health for CT dose
measurement is the pencil ionization chamber. - Answer True
True or False
Shielding is a radiation protection action specially designed to only protect the patient. -
Answer False
Shielding is intended to protect not only patients (gonadal, breast, eyes, and thyroid
shielding) but also personnel and members of the public.
True or False
The radiation quantity exposure refers to the concentration of radiation at a particular
point on the patient. - Answer True
True or False
Stochastic effects are those effects for which the probability of the effect occurring
depends on the dose. - Answer True
True or False
The measured radiation dose is inversely proportional to the number of detector rows. -
Answer True
True or False
, Phantoms are not used for the process of CT dose measurement. - Answer False
To standardize the measurement of the dose and provide a clinically realistic geometry,
the Bureau of Radiological Health researchers suggested that the ionization chamber
be placed in one of two cylindrical phantoms during the radiation measurement.
True or False
The old unit of effective dose was the rad. - Answer False
The old unit of effective dose was the rem.
The following QC tests should be done biannually except:
a. flatness of CT number
b. low-contrast resolution
c. light field accuracy
d. high-contrast resolution - Answer c. light field accuracy
What term describes performance standards as a level under favorable circumstances
at which a facility should work if feasible?
a. Tolerable
b. Acceptable
c. Achievable
d. Possible - Answer c. Achievable
QC tests, test results, and interpretation of test results should be:
a. recorded in a QC logbook.
b. recorded in the positioning notebook of the technologist.
c. recorded on pieces of paper.
d. recorded on the bulletin board beside the CT scanner. - Answer a. recorded in a QC
logbook
QC tests can be performed by all of the following except:
a. department aides.
b. QC technicians.
c. technologists.
d. medical physicists. - Answer a. department aides
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