MOSBY CT EXAMS SCRIPT UPDATED QUESTIONS AND
ANSWERS SURE A+
✔✔Which of the following section widths would case the greatest amount of partial
volume averaging - ✔✔The largest mm in this case it was 10 mm
✔✔Partial volume artifacts in CT scanning are? - ✔✔Decrease in the homogeneity of
the tissue
✔✔Scan thickness is primarily important for the part it plays in which of the following? -
✔✔volume averaging
✔✔Large section widths result in long voxel lengths with possible several tissue types
accounted for within the voxel
TRUE OR FALSE - ✔✔TRUE
✔✔What type of section widths tend to decrease the partial volume effect - ✔✔Narrow
section widths
✔✔When a CT number is assigned to the representative pixel the density of all of the
tissue types is averaged, yielding one attenuation coefficient
TRUE OR FALSE - ✔✔TRUE
✔✔Which of the following oral contrast agents offers the best visualization of the
enhanced GI wall on post IV contrast CT examiniations - ✔✔water
✔✔What is a negative oral contrast agent that improves the visualization of the
enhancing enteral wall when an IV contrast agent is administered - ✔✔Water
✔✔What other agents are negative oral contrast agents - ✔✔VoLumen, milk
✔✔What agents are negative oral contrast agents that may also be effective as agents
capable of distending the bowel while allowing for wall visualization outside of using
water - ✔✔VoLumen, milk
✔✔During a CTA of the brain's circle of Willis, if an iodinated contrast agent is injected
at a rate of 3-4 mL/sec, an adequate delay for optimal vessel opacification would be the
range of - ✔✔12-20 seconds
✔✔The spinal cord extends inferiorly from the brains medulla and terminates at the
approximately the level of - ✔✔T12-L1
,✔✔At its distal end the spinal cord tapers into the - ✔✔conus meduallaris
✔✔What is the nerve bundle extending inferiorly from the spinal cord - ✔✔cauda equina
✔✔Which of the following is not a CT image postprocessing technique - ✔✔MTF
modulation transfer function
✔✔A CT scanner capable of producing an image that is a perfect reproduction of the
actual anatomic section is said to have an MTF modulator transfer function of - ✔✔1
✔✔What is the term that measures the ability of the system to faithfully reproduce the
area of anatomy - ✔✔MTF modulator transfer function
✔✔This term can be thought of as a comparison of the actual anatomy with the image
produced - ✔✔MTF modulator transfer function
✔✔If the two images are exactly alike the MTF modulator transfer function is - ✔✔1
✔✔When is the MTF modulator transfer function 0 - ✔✔If the image produced contains
no useful information
✔✔The act of the CT patient straining the abdominal muscles or bearing down to
improve demonstration of an abdominal wall hernia is referred to as - ✔✔Valsalva
maneuver
✔✔A CT acquisition while the patient performs this maneuver may be utilized to
improve visualization of adominal wall hernias - ✔✔Valsalva maneuver
✔✔What is the maximum allowable blood glucose measurement for patients schedule
to undergo PET CT examination - ✔✔150 mg/dL
✔✔The patients blood glucose may be measured prior to the injection of F-18-
Flurodeoxyglucose (FDG). It should be below 150 mg/dL to prevent FDG uptake
inhibition by glucose circulating in the bloodstream - ✔✔150 mg/dL
✔✔Which of the following adjustments in technical factors will result in an increase in
spatial resolution - ✔✔increase sampling frequency
✔✔Another name for sampling frequency is - ✔✔Views per rotation VPM
✔✔What controls the volume of transmission data acquired for each gantry rotation -
✔✔Views per rotation VPM controls
,✔✔Very small objects exhibit what type frequencies that only system with high sampling
rates will be capable of resolving - ✔✔high spatial frequencies
✔✔Swelling at or above the puncture site during or after the injection is an indication of
which of the following - ✔✔extravasation
✔✔Infiltration of contrast agent outside of the blood vessel into the surrounding soft
tissue is called - ✔✔extravasation
✔✔Another name for infiltration is called - ✔✔extravasation
✔✔What is considered extremely painful and a potentially serious consequence of
improper administration of IV contrast media - ✔✔extravasation
✔✔In 1917 Austrian Mathematician proved that it was possible to reconstruct a three
dimensional object from the infinite set of all of its projections - ✔✔J. Radon
✔✔In 1917 he proved that it was possible to build an image of an object through the use
of an extremely large set of its projections - ✔✔J. Radon
✔✔Increasing the pitch will cause a loss of image sharpness - ✔✔TRUE
✔✔Which of the following technical adjustments would result in a decrease in patient
dose - ✔✔*decrease mAs
* increase detector pitch
* decrease kVp
✔✔What imaging factor defines the intensity of the xray beam - ✔✔kVp
✔✔The travel distance of the CT scan table per 360 rotation of the x-ray tube, divided
by the x-ray beam collimation width is the definition for which of the following? -
✔✔Pitch
✔✔The unit for pitch in multislice CT are ? - ✔✔pitch is dimensionless
✔✔This is the travel distance of the CT scan table per 360 degree rotation of the xray
tube divided by the xray beam collimation width - ✔✔Pitch
✔✔Increasing the pitch will result in a scan covering less anatomy lengthwise -
✔✔False
✔✔Increasing the pitch will increase the radiation dose to your patient - ✔✔FALSE
, ✔✔Increasing the pitch will DECREASE the radiation dose to your patient - ✔✔TRUE
✔✔The process of converting the data from the attenuation profile to a matrix is know
as? - ✔✔back projection
✔✔The propensity of a contrast agent to cause fluid to move from the extravascular
space to the intravascular space - ✔✔osmolality
✔✔What is described as the propensity of the agent to cause fluid from the outside the
blood vessel -extravascular space- to move into the bloodstream-intravascular space -
✔✔osmolality
✔✔This term is the measurement of the number of particles per kilogram of water
contained in iodinated contrast media. - ✔✔Osmolality
https://www.examedge.com
✔✔This term is used in determining the potential for adverse reaction to contrast media.
- ✔✔Osmolality
https://www.examedge.com
✔✔The average osmolality of non-ionic contrast agents is
Open Calculator
1300 mOsm/kg water.
500 mOsm/kg water.
750 mOsm/kg water.
250 mOsm/kg water. - ✔✔Correct answer:
750 mOsm/kg water
.
Osmolality is the measurement of the number of particles per kilogram of water
contained in iodinated contrast media. Osmolality is used in determining the potential for
adverse reaction to contrast media.
ANSWERS SURE A+
✔✔Which of the following section widths would case the greatest amount of partial
volume averaging - ✔✔The largest mm in this case it was 10 mm
✔✔Partial volume artifacts in CT scanning are? - ✔✔Decrease in the homogeneity of
the tissue
✔✔Scan thickness is primarily important for the part it plays in which of the following? -
✔✔volume averaging
✔✔Large section widths result in long voxel lengths with possible several tissue types
accounted for within the voxel
TRUE OR FALSE - ✔✔TRUE
✔✔What type of section widths tend to decrease the partial volume effect - ✔✔Narrow
section widths
✔✔When a CT number is assigned to the representative pixel the density of all of the
tissue types is averaged, yielding one attenuation coefficient
TRUE OR FALSE - ✔✔TRUE
✔✔Which of the following oral contrast agents offers the best visualization of the
enhanced GI wall on post IV contrast CT examiniations - ✔✔water
✔✔What is a negative oral contrast agent that improves the visualization of the
enhancing enteral wall when an IV contrast agent is administered - ✔✔Water
✔✔What other agents are negative oral contrast agents - ✔✔VoLumen, milk
✔✔What agents are negative oral contrast agents that may also be effective as agents
capable of distending the bowel while allowing for wall visualization outside of using
water - ✔✔VoLumen, milk
✔✔During a CTA of the brain's circle of Willis, if an iodinated contrast agent is injected
at a rate of 3-4 mL/sec, an adequate delay for optimal vessel opacification would be the
range of - ✔✔12-20 seconds
✔✔The spinal cord extends inferiorly from the brains medulla and terminates at the
approximately the level of - ✔✔T12-L1
,✔✔At its distal end the spinal cord tapers into the - ✔✔conus meduallaris
✔✔What is the nerve bundle extending inferiorly from the spinal cord - ✔✔cauda equina
✔✔Which of the following is not a CT image postprocessing technique - ✔✔MTF
modulation transfer function
✔✔A CT scanner capable of producing an image that is a perfect reproduction of the
actual anatomic section is said to have an MTF modulator transfer function of - ✔✔1
✔✔What is the term that measures the ability of the system to faithfully reproduce the
area of anatomy - ✔✔MTF modulator transfer function
✔✔This term can be thought of as a comparison of the actual anatomy with the image
produced - ✔✔MTF modulator transfer function
✔✔If the two images are exactly alike the MTF modulator transfer function is - ✔✔1
✔✔When is the MTF modulator transfer function 0 - ✔✔If the image produced contains
no useful information
✔✔The act of the CT patient straining the abdominal muscles or bearing down to
improve demonstration of an abdominal wall hernia is referred to as - ✔✔Valsalva
maneuver
✔✔A CT acquisition while the patient performs this maneuver may be utilized to
improve visualization of adominal wall hernias - ✔✔Valsalva maneuver
✔✔What is the maximum allowable blood glucose measurement for patients schedule
to undergo PET CT examination - ✔✔150 mg/dL
✔✔The patients blood glucose may be measured prior to the injection of F-18-
Flurodeoxyglucose (FDG). It should be below 150 mg/dL to prevent FDG uptake
inhibition by glucose circulating in the bloodstream - ✔✔150 mg/dL
✔✔Which of the following adjustments in technical factors will result in an increase in
spatial resolution - ✔✔increase sampling frequency
✔✔Another name for sampling frequency is - ✔✔Views per rotation VPM
✔✔What controls the volume of transmission data acquired for each gantry rotation -
✔✔Views per rotation VPM controls
,✔✔Very small objects exhibit what type frequencies that only system with high sampling
rates will be capable of resolving - ✔✔high spatial frequencies
✔✔Swelling at or above the puncture site during or after the injection is an indication of
which of the following - ✔✔extravasation
✔✔Infiltration of contrast agent outside of the blood vessel into the surrounding soft
tissue is called - ✔✔extravasation
✔✔Another name for infiltration is called - ✔✔extravasation
✔✔What is considered extremely painful and a potentially serious consequence of
improper administration of IV contrast media - ✔✔extravasation
✔✔In 1917 Austrian Mathematician proved that it was possible to reconstruct a three
dimensional object from the infinite set of all of its projections - ✔✔J. Radon
✔✔In 1917 he proved that it was possible to build an image of an object through the use
of an extremely large set of its projections - ✔✔J. Radon
✔✔Increasing the pitch will cause a loss of image sharpness - ✔✔TRUE
✔✔Which of the following technical adjustments would result in a decrease in patient
dose - ✔✔*decrease mAs
* increase detector pitch
* decrease kVp
✔✔What imaging factor defines the intensity of the xray beam - ✔✔kVp
✔✔The travel distance of the CT scan table per 360 rotation of the x-ray tube, divided
by the x-ray beam collimation width is the definition for which of the following? -
✔✔Pitch
✔✔The unit for pitch in multislice CT are ? - ✔✔pitch is dimensionless
✔✔This is the travel distance of the CT scan table per 360 degree rotation of the xray
tube divided by the xray beam collimation width - ✔✔Pitch
✔✔Increasing the pitch will result in a scan covering less anatomy lengthwise -
✔✔False
✔✔Increasing the pitch will increase the radiation dose to your patient - ✔✔FALSE
, ✔✔Increasing the pitch will DECREASE the radiation dose to your patient - ✔✔TRUE
✔✔The process of converting the data from the attenuation profile to a matrix is know
as? - ✔✔back projection
✔✔The propensity of a contrast agent to cause fluid to move from the extravascular
space to the intravascular space - ✔✔osmolality
✔✔What is described as the propensity of the agent to cause fluid from the outside the
blood vessel -extravascular space- to move into the bloodstream-intravascular space -
✔✔osmolality
✔✔This term is the measurement of the number of particles per kilogram of water
contained in iodinated contrast media. - ✔✔Osmolality
https://www.examedge.com
✔✔This term is used in determining the potential for adverse reaction to contrast media.
- ✔✔Osmolality
https://www.examedge.com
✔✔The average osmolality of non-ionic contrast agents is
Open Calculator
1300 mOsm/kg water.
500 mOsm/kg water.
750 mOsm/kg water.
250 mOsm/kg water. - ✔✔Correct answer:
750 mOsm/kg water
.
Osmolality is the measurement of the number of particles per kilogram of water
contained in iodinated contrast media. Osmolality is used in determining the potential for
adverse reaction to contrast media.
