Answers to Common Questions About Safety of CT Scans
The radiation dose to the patient during a
CT scan is - CORRECT ANSWER - CTDI
Contact shields are made of _______________ and selectively protect organs that lie within the scanned
region during a CT scan. - CORRECT ANSWER - Bismuth
Which ...
Answers to Common Questions About Safety of CT Scans
The radiation dose to the patient during a
CT scan is - CORRECT ANSWER - CTDI
Contact shields are made of _______________ and selectively protect organs that lie within the scanned
region during a CT scan. - CORRECT ANSWER - Bismuth
Which technical factor has a direct effect on patient dose? - CORRECT ANSWER - MAs
A device used to measure the patient dose from a CT exam is - CORRECT ANSWER - Ionization chamber
To meet current industry standards for required dose reduction measures, a CT system must employ
which of the following?
1. Automatic exposure control (AEC)
2. Adult and pediatric protocols
3. Digital imaging and communications in medicine (DICOM) radiation dose structured reporting (RDSR) -
CORRECT ANSWER - 1, 2, & 3
When scanning a pediatric patient, what technical factor should be adjusted - CORRECT ANSWER - Tube
milliamperage (mAs)
Whole body risk based upon the radio sensitivity of exposed tissues may be estimated using the unit: -
CORRECT ANSWER - Effective dose
CTDI stands for - CORRECT ANSWER - CT dose index
The use of iterative reconstruction techniques for CT data processing results in
, 1. Decreased noise on the reconstructed image
2. Decreased radiation dose to the patient
3. Decreased image reconstruction time. - CORRECT ANSWER - 1 and 2 only
Which of the following methods may be employed to reduce the radiation dose to the pediatric patient
undergoing CT?
1. Reduce mA
2. Limit phases of acquisition
3. Increase pitch - CORRECT ANSWER - 1, 2 and 3
A decrease in the focus to detector distance of a multi detector CT system would result in - CORRECT
ANSWER - Increased patient dose
The radiation dose index calculation that takes into account the variations in absorption across the field
of view due to beam hardening is termed - CORRECT ANSWER - CTDIw
The radiation dose structured report (RDSR) must include which of the following details regarding a CT
acquisition
The reduction in intensity of the CT x-ray beam as it passes through patient tissue may be generally
termed - CORRECT ANSWER - Attenuation
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