Patient Safety in Computed Tomography Answers to Common Questions
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Patient Safety in Computed Tomography
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Patient Safety In Computed Tomography
Patient Safety in Computed Tomography Answers to Common Questions
The ____________ measures the amount of radiation in the surrounding air. - CORRECT ANSWER -
roentgen
The _______ is the measurement of how much radiation is absorbed. - CORRECT ANSWER - rad
The _______ is used for monitoring per...
Patient Safety in Computed Tomography Answers to Common Questions
The ____________ measures the amount of radiation in the surrounding air. - CORRECT ANSWER -
roentgen
The _______ is the measurement of how much radiation is absorbed. - CORRECT ANSWER - rad
The _______ is used for monitoring personnel radiation dose. - CORRECT ANSWER - rem
The _________ _________ of ________ or SI units is the standardized measurement of radiation
exposure established by the international community. - CORRECT ANSWER - International System of
Units
The rad has been replaced by the ________ and the rem has been replaced by the _________ in SI units.
- CORRECT ANSWER - gray (Gy)
Sievert (Sv)
Convert the following radiation units to SI units:
A. 500 rad:
B.300 rem: - CORRECT ANSWER - 5 Gy
3 Sv
The CT dose index (CTDI) is used to measure the radiation exposure for a _________-________ scanner.
- CORRECT ANSWER - single-slice
The ________ __________ _________ is the most accurate dose index for Computed Tomography. -
CORRECT ANSWER - Dose Length Product (DLP)
, What is the DLP equation? - CORRECT ANSWER - DLP = CTDIvol x Scan Length
What does ALARA stand for? - CORRECT ANSWER - As Low As Reasonably Achievable
How is the patient shielded when a CT scan is performed? - CORRECT ANSWER - Shielding is applied 360
degrees around the patient because radiation comes from all directions in CT
_______ controls the ability of the x-ray beam to penetrate tissue and controls __________ on the
image. - CORRECT ANSWER - kVp
contrast
________ controls the number of x-ray photons produced by the CT x-ray tube. - CORRECT ANSWER -
mAs
An increase in mAs will result in ___________ noise and __________ radiation exposure to the patient. -
CORRECT ANSWER - decreased
increased
CT Scanners use a type of automatic exposure control called ______ _____________. - CORRECT
ANSWER - mA modulation
What mA modulation is called for a:
A. GE Scanner:
B. Siemens Scanner: - CORRECT ANSWER - auto mA
Care dose
The CT technologist changes mA based on what 3 patient factors? - CORRECT ANSWER - A. Body habitus
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