Mosby's Exam Review 2025/2026 Exam
Questions Marking Scheme New Update
| A+ Rated
The hallmark CT finding for Focal Nodular Hyperplasia of the liver is: -
🧠ANSWER ✔✔a central scar that remains hypodense after initial contrast
agent administration
CT- guided needle biopsies are most commonly performed on the: -
🧠ANSWER ✔✔Pancreas
Which of the following areas of the head becomes calcified?
(1) thalamus
(2) pineal gland
(3) choroid plexus - 🧠ANSWER ✔✔Both the pineal gland and the choroid
plexus are common areas of calcification in the brain and are visualized as
increased attenuation and density on a scan.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,The normal range of cerebral blood flow (CBF) through 100g of the brain's
gray matter is: - 🧠ANSWER ✔✔The normal range of cerebral blood flow in
the gray matter is 50-60mL/100g/min
Which of the following methods may be used to determine the appropriate
injection delay for optimal vessel enhancement during a CTA examination
of the brain?
(1)measurement of the patient's pulse rate
(2)performing a bolus-timing sequence
(3)utilizing bolus-tracking software - 🧠ANSWER ✔✔Although the pulse rate
may provide an indication of the patients overall cardiac function, it is NOT
UNTILIZED to determine injection delays for angio's.
Empiric delays, bolus-timing sequences, and bolus-tracking software may
all be used to accurately acquire CTA studies during peak vasculature
enhancement.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,Phantom measurement of the uniformity of a CT system is performed
primarily to assess the negative effects of - 🧠ANSWER ✔✔Beam
hardening.
The UNIFORMITY of a CT system describes its ability to maintain relatively
consistent CT values across the entire image of an object of equal density,
such as a water-filled phantom.
Beam hardening occurs as low-energy x-ray photons are absorbed when
the beam passes through the patient. The average photon energy of the
beam increases along the path as the lower energy photons are absorbed
and may result in a loss of system uniformity.
The ______________ gland is located in the anterosuperior portion of the
mediastinum and is often identified with CT during scanning of younger
patients. - 🧠ANSWER ✔✔The THYMUS gland. It is most easily visible prior
to puberty. After puberty it becomes increasingly infiltrated with fat, so it is
more difficult to image with CT.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, Ejection Fraction - 🧠ANSWER ✔✔Describes the percentage of blood
pumped out of a cardiac ventricle during each contraction. It is a measure
of cardiac function and can be accurately determined during a cardiac CT
exam. With system software, the ejection fraction can be calculated from a
comparison between the volume of blood within a ventricle at the end of
filling (end-diastolic volume) and the volume at the end of contraction (end-
systolic volume).
During CT perfusion studies, the quantity of blood (in mL) contained within
100g of brain tissue is termed the: - 🧠ANSWER ✔✔Cerebral blood volume
(CBV). It describes the quantity of blood (in mL) contained within a 100g
volume of brain tissue. Normal range is 4-5mL/100g
Two adjacent pixels are measured to have a difference of 1 HU. This
amounts to a tissue density difference of approximately: - 🧠ANSWER
✔✔0.1%. Pixels that differ by only 1 Hounsfield unit respresent tissue
whose attenuation coefficients differ by only 0.1%
The liver has a dual blood supply and receives 25% of its blood from the: -
🧠ANSWER ✔✔Hepatic artery; The liver has a dual blood supply, receiving
75% of its supply from the portal vein, and the remaining 25% of blood from
the hepatic artery.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
Questions Marking Scheme New Update
| A+ Rated
The hallmark CT finding for Focal Nodular Hyperplasia of the liver is: -
🧠ANSWER ✔✔a central scar that remains hypodense after initial contrast
agent administration
CT- guided needle biopsies are most commonly performed on the: -
🧠ANSWER ✔✔Pancreas
Which of the following areas of the head becomes calcified?
(1) thalamus
(2) pineal gland
(3) choroid plexus - 🧠ANSWER ✔✔Both the pineal gland and the choroid
plexus are common areas of calcification in the brain and are visualized as
increased attenuation and density on a scan.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,The normal range of cerebral blood flow (CBF) through 100g of the brain's
gray matter is: - 🧠ANSWER ✔✔The normal range of cerebral blood flow in
the gray matter is 50-60mL/100g/min
Which of the following methods may be used to determine the appropriate
injection delay for optimal vessel enhancement during a CTA examination
of the brain?
(1)measurement of the patient's pulse rate
(2)performing a bolus-timing sequence
(3)utilizing bolus-tracking software - 🧠ANSWER ✔✔Although the pulse rate
may provide an indication of the patients overall cardiac function, it is NOT
UNTILIZED to determine injection delays for angio's.
Empiric delays, bolus-timing sequences, and bolus-tracking software may
all be used to accurately acquire CTA studies during peak vasculature
enhancement.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,Phantom measurement of the uniformity of a CT system is performed
primarily to assess the negative effects of - 🧠ANSWER ✔✔Beam
hardening.
The UNIFORMITY of a CT system describes its ability to maintain relatively
consistent CT values across the entire image of an object of equal density,
such as a water-filled phantom.
Beam hardening occurs as low-energy x-ray photons are absorbed when
the beam passes through the patient. The average photon energy of the
beam increases along the path as the lower energy photons are absorbed
and may result in a loss of system uniformity.
The ______________ gland is located in the anterosuperior portion of the
mediastinum and is often identified with CT during scanning of younger
patients. - 🧠ANSWER ✔✔The THYMUS gland. It is most easily visible prior
to puberty. After puberty it becomes increasingly infiltrated with fat, so it is
more difficult to image with CT.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, Ejection Fraction - 🧠ANSWER ✔✔Describes the percentage of blood
pumped out of a cardiac ventricle during each contraction. It is a measure
of cardiac function and can be accurately determined during a cardiac CT
exam. With system software, the ejection fraction can be calculated from a
comparison between the volume of blood within a ventricle at the end of
filling (end-diastolic volume) and the volume at the end of contraction (end-
systolic volume).
During CT perfusion studies, the quantity of blood (in mL) contained within
100g of brain tissue is termed the: - 🧠ANSWER ✔✔Cerebral blood volume
(CBV). It describes the quantity of blood (in mL) contained within a 100g
volume of brain tissue. Normal range is 4-5mL/100g
Two adjacent pixels are measured to have a difference of 1 HU. This
amounts to a tissue density difference of approximately: - 🧠ANSWER
✔✔0.1%. Pixels that differ by only 1 Hounsfield unit respresent tissue
whose attenuation coefficients differ by only 0.1%
The liver has a dual blood supply and receives 25% of its blood from the: -
🧠ANSWER ✔✔Hepatic artery; The liver has a dual blood supply, receiving
75% of its supply from the portal vein, and the remaining 25% of blood from
the hepatic artery.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
