Mosby's Exam Review for Computed
Tomography-Safety Exam 2026 Questions
and Answers
In a female patient, gonadal shielding may be applied during which of the
following CT examinations?
1. Chest
2. Abdomen
3. Brain - Correct answer-Gonadal shielding may be used whenever the gonads do
not lie within the area of clinical interest.
The quantity of radiation dose received by the patient from a series of CT scans is
referred to as the: - Correct answer-MULTIPLE SCAN AVERAGE DOSE
(MSAD) is used to quantify the amount of exposure a patient receives from a
series of CT scans. It is calculated from the computed tomography dose index
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,(CTDI) through a series of equations. The quantity of radiation per scan is
measured with an ionization chamber.
Which of the following technical characteristics of a CT system does NOT directly
affect patient dose? - Correct answer-Answer: Filament size ;
Which technical characteristics of a CT system affect patient dose? - Correct
answer-(1) source-to-detector distance (2) Filtration (3) Detector efficiency
Radiation protection of the CT patient should involve which of the following
principles?
1. Strict clinical indication
2. Protocol optimization
3. Shielding - Correct answer-(1) STRICT CLINICAL INDICATIONS ensure that
CT is performed only when alternative non-ionizing radiation examinations have
been deemed inconclusive or inappropriate. An (2) OPTIMIZED PROTOCOL is
one that acquires CT images with acceptable levels of noise at the lowest possible
dose. (3) LEAD SHIELDING should be utilized during CT whenever clinically
possible.
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, The approximate radiation dose measured during a scan of a 100-mm-long pencil
ionization chamber is termed the: - Correct answer-CTDI100 is a fixed
measurement taken with a 100-mm-long pencil ionization chamber inserted into an
acrylic phantom. The CTDI100 standardizes the dose measurement from a single
axial scan and can be used to compare doses from different scan techniques.
Which of the following statements most accurately describes the relationship
between slice sensitivity profile (SSP) and dose profile? - Correct answer-THE
DOSE PROFILE IS ALWAYS WIDER THAN THE SLICE SENSITIVITY
PROFILE (SSP)
The term slice sensitivity profile (SSP) may be used to describe the reconstructed
CT section. However, the section of tissue exposed to ionizing radiation, or dose
profile, is greater in width than the SSP.
The calculation of the average cumulative dose to each section within an
acquisition of multiple sections is termed the: - Correct answer-MSAD
When the mAs value utilized for a given CT acquisition is doubled, which of the
following occurs? - Correct answer-There is a direct and proportional relationship
between mAs and patient dose. When the mAs value for a given exposure is
doubled, PATIENT DOSE IS DOUBLED.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
Tomography-Safety Exam 2026 Questions
and Answers
In a female patient, gonadal shielding may be applied during which of the
following CT examinations?
1. Chest
2. Abdomen
3. Brain - Correct answer-Gonadal shielding may be used whenever the gonads do
not lie within the area of clinical interest.
The quantity of radiation dose received by the patient from a series of CT scans is
referred to as the: - Correct answer-MULTIPLE SCAN AVERAGE DOSE
(MSAD) is used to quantify the amount of exposure a patient receives from a
series of CT scans. It is calculated from the computed tomography dose index
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,(CTDI) through a series of equations. The quantity of radiation per scan is
measured with an ionization chamber.
Which of the following technical characteristics of a CT system does NOT directly
affect patient dose? - Correct answer-Answer: Filament size ;
Which technical characteristics of a CT system affect patient dose? - Correct
answer-(1) source-to-detector distance (2) Filtration (3) Detector efficiency
Radiation protection of the CT patient should involve which of the following
principles?
1. Strict clinical indication
2. Protocol optimization
3. Shielding - Correct answer-(1) STRICT CLINICAL INDICATIONS ensure that
CT is performed only when alternative non-ionizing radiation examinations have
been deemed inconclusive or inappropriate. An (2) OPTIMIZED PROTOCOL is
one that acquires CT images with acceptable levels of noise at the lowest possible
dose. (3) LEAD SHIELDING should be utilized during CT whenever clinically
possible.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, The approximate radiation dose measured during a scan of a 100-mm-long pencil
ionization chamber is termed the: - Correct answer-CTDI100 is a fixed
measurement taken with a 100-mm-long pencil ionization chamber inserted into an
acrylic phantom. The CTDI100 standardizes the dose measurement from a single
axial scan and can be used to compare doses from different scan techniques.
Which of the following statements most accurately describes the relationship
between slice sensitivity profile (SSP) and dose profile? - Correct answer-THE
DOSE PROFILE IS ALWAYS WIDER THAN THE SLICE SENSITIVITY
PROFILE (SSP)
The term slice sensitivity profile (SSP) may be used to describe the reconstructed
CT section. However, the section of tissue exposed to ionizing radiation, or dose
profile, is greater in width than the SSP.
The calculation of the average cumulative dose to each section within an
acquisition of multiple sections is termed the: - Correct answer-MSAD
When the mAs value utilized for a given CT acquisition is doubled, which of the
following occurs? - Correct answer-There is a direct and proportional relationship
between mAs and patient dose. When the mAs value for a given exposure is
doubled, PATIENT DOSE IS DOUBLED.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
