MOSBY CT COMPREHENSIVE EXAM UPDATED QUESTIONS
AND ANSWERS SURE A+
✔✔For the best demonstration of lumbar vertebral disc spaces the plane of imaging
should be - ✔✔parallel to the plane of the disc spaces
✔✔How do you get the best the best demonstration of lumbar vertebral disc spaces -
✔✔With individual axial acquisitions through each disc space with the gantry angled
parallel to the plane of the intervertebral disc
✔✔The AquilionONE MSCT scanner is capable of acquiring ? slices per rotation -
✔✔320
✔✔With the volumetric acquisition capabilities of MSCT, multiplanar reformation MPR
images may be reconstructed from a - ✔✔singe complete data set acquired with a
perpendicular gantry position
✔✔Which of the following is NOT an advantage of multislice CT over singleslice CT -
✔✔Decreased volume coverage
✔✔The first multislice CT scanners had ? detector rows - ✔✔2F
✔✔The most common indication for CT guided radiofrequency ablation RFA is in
treatment of neoplasms involving the - ✔✔liver
✔✔The most common indication for CT-guided RFA is in treatment of - ✔✔hepatic
neoplasm
✔✔The quantity of blood pumped out of a ventricle every heartbeat is termed the -
✔✔ejection fraction
✔✔What is the term that describes the percentage of blood pumped out of a cardiac
ventricle during each contraction - ✔✔ejection fraction
✔✔What is the measure of cardiac function and can be accurately determined during a
cardiac CT examiniation - ✔✔ejection fraction
✔✔With system software this term can be calculated from a comparison between the
volume of blood within a ventricle at the end of filing (end-diastolic volume) and the
volume at end of contraction (end-systolic volume) - ✔✔ejection fraction
✔✔What is the term for volume of blood within a ventricle at the end of filing - ✔✔end-
diastolic volume
,✔✔What is the term for volume of blood within a ventricle at end of contraction -
✔✔end-systolic volume
✔✔Which of the following correctly describes the position of the seminal vesicles in the
male - ✔✔Located posterior to the bladder and anterior to the rectum
✔✔seminal vesicles in the male are located posterior to the bladder and anterior to the
rectum in what position/section - ✔✔cross section of the male pelvis
✔✔Which of the following would increase the noise apparent a CT image - ✔✔decrease
in aperture size
✔✔This is measured by obtaining the standard deviation of the CT numbers within a
region of interest - ✔✔noise
✔✔What is interpolation? - ✔✔A mathematical method of estimating an unknown value
using the known values on either side of the unknown.
✔✔As the angle of the CT slice becomes steeper, the interpolation required to adjust
the data increases - ✔✔TRUE
✔✔A mathematical method of estimating the value of an unknown function using the
known value on either side of the function defines which of the following terms -
✔✔interpolation
✔✔The typical rotation time for a flat panel ct system is ? Compared to a multidetector
row ct scanner - ✔✔Much longer
✔✔Which of the following statements regarding the reconstruction interval RI is false -
✔✔The RI does affect patient dose
✔✔Which of the following statements regarding the reconstruction interval RI is true -
✔✔*The RI does not affect patient dose
*The RI is independent of the scan time
*The RI is independent of the xray beam collimation
*The RI is independent of the acquisition image thickness
✔✔Which of the following mathematical techniques is used for the reconstruction of
volumetric MDCT images - ✔✔180 degree interpolation 180LI
✔✔What technique is commonly used for current MDCT image reconstruction - ✔✔180
degree interpolation 180LI
,✔✔What technique/method interpolates data acquired at a distance only 180 degrees
away from the location of the reconstructed slice - ✔✔180 degree interpolation 180LI
✔✔The primary advantage of prospective ECG gating for cardiac CT over retrospective
ECG gating is - ✔✔reduction in patient radiation dose
✔✔Which of the following is NOT an advantage of retrospective ECG gated cardiac -
✔✔increased motion artifacts
✔✔The main benefit of prospective ECG gating is the potential for up to a what percent
reduction in patient radiation dose. - ✔✔70% reduction
✔✔What requires a steady heartbeat of limit motion artifact - ✔✔Prospective ECG
gating
✔✔What is the term that is the evaluation of cardiac fuction and is not possible because
data is acqured only during diastole - ✔✔Prospective ECG gating
✔✔With a cardiac CT, the typical target enhancement would be considered which of the
following?
In a range of 40-80 HU
In a range of 100-150 HU
In a range of 10-50 HU
In a range of 200-300 HU - ✔✔In a range of 200-300 HU
image : cardiac CT
✔✔Which of the following is an advantage of prospective ECG triggered cardiac CT -
✔✔reduced radiation exposure
✔✔Which of the following is a typical cardiac CT pitch value - ✔✔1.5
✔✔A CT scan is taken through the pelvis. The CT numbers between the hip bones are
significantly decreased. The most reasonable explanation for this observation is -
✔✔Beam hardening
✔✔Phantom measurement of the uniformity of a CT system is performed primarily to
assess the negative effects of - ✔✔beam hardening
, ✔✔This is a term that occurs as low-energy xray photons are absorbed when the beam
passes through the patient. - ✔✔Beam hardening
✔✔The average photon energy of the beam increases along the path and may result in
a loss of system uniformity - ✔✔Beam hardening
✔✔Which of the following is true regarding beam hardening artifacts in CT images? -
✔✔They result in an image that is darker centrally than peripherally
✔✔This the term 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 water-filled
phantom. - ✔✔uniformity
✔✔Which of the following units is used to quantify absorbed dose - ✔✔grays (Gy)
✔✔This term describes the amount of xray energy absorbed in a unit of mass -
✔✔absorbed dose
✔✔When doing CT Coronary Calcium Screening, what does a score of 7 indicate?
Minimal plaque.
Mild plaque.
Moderate plaque.
Extensive plaque - ✔✔Correct Answer:
Minimal plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, A score of 0 indicates - ✔✔no
evidence of plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, 1-10 is - ✔✔minimal plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, 11-100 indicates - ✔✔mild plaque
https://www.examedge.com
AND ANSWERS SURE A+
✔✔For the best demonstration of lumbar vertebral disc spaces the plane of imaging
should be - ✔✔parallel to the plane of the disc spaces
✔✔How do you get the best the best demonstration of lumbar vertebral disc spaces -
✔✔With individual axial acquisitions through each disc space with the gantry angled
parallel to the plane of the intervertebral disc
✔✔The AquilionONE MSCT scanner is capable of acquiring ? slices per rotation -
✔✔320
✔✔With the volumetric acquisition capabilities of MSCT, multiplanar reformation MPR
images may be reconstructed from a - ✔✔singe complete data set acquired with a
perpendicular gantry position
✔✔Which of the following is NOT an advantage of multislice CT over singleslice CT -
✔✔Decreased volume coverage
✔✔The first multislice CT scanners had ? detector rows - ✔✔2F
✔✔The most common indication for CT guided radiofrequency ablation RFA is in
treatment of neoplasms involving the - ✔✔liver
✔✔The most common indication for CT-guided RFA is in treatment of - ✔✔hepatic
neoplasm
✔✔The quantity of blood pumped out of a ventricle every heartbeat is termed the -
✔✔ejection fraction
✔✔What is the term that describes the percentage of blood pumped out of a cardiac
ventricle during each contraction - ✔✔ejection fraction
✔✔What is the measure of cardiac function and can be accurately determined during a
cardiac CT examiniation - ✔✔ejection fraction
✔✔With system software this term can be calculated from a comparison between the
volume of blood within a ventricle at the end of filing (end-diastolic volume) and the
volume at end of contraction (end-systolic volume) - ✔✔ejection fraction
✔✔What is the term for volume of blood within a ventricle at the end of filing - ✔✔end-
diastolic volume
,✔✔What is the term for volume of blood within a ventricle at end of contraction -
✔✔end-systolic volume
✔✔Which of the following correctly describes the position of the seminal vesicles in the
male - ✔✔Located posterior to the bladder and anterior to the rectum
✔✔seminal vesicles in the male are located posterior to the bladder and anterior to the
rectum in what position/section - ✔✔cross section of the male pelvis
✔✔Which of the following would increase the noise apparent a CT image - ✔✔decrease
in aperture size
✔✔This is measured by obtaining the standard deviation of the CT numbers within a
region of interest - ✔✔noise
✔✔What is interpolation? - ✔✔A mathematical method of estimating an unknown value
using the known values on either side of the unknown.
✔✔As the angle of the CT slice becomes steeper, the interpolation required to adjust
the data increases - ✔✔TRUE
✔✔A mathematical method of estimating the value of an unknown function using the
known value on either side of the function defines which of the following terms -
✔✔interpolation
✔✔The typical rotation time for a flat panel ct system is ? Compared to a multidetector
row ct scanner - ✔✔Much longer
✔✔Which of the following statements regarding the reconstruction interval RI is false -
✔✔The RI does affect patient dose
✔✔Which of the following statements regarding the reconstruction interval RI is true -
✔✔*The RI does not affect patient dose
*The RI is independent of the scan time
*The RI is independent of the xray beam collimation
*The RI is independent of the acquisition image thickness
✔✔Which of the following mathematical techniques is used for the reconstruction of
volumetric MDCT images - ✔✔180 degree interpolation 180LI
✔✔What technique is commonly used for current MDCT image reconstruction - ✔✔180
degree interpolation 180LI
,✔✔What technique/method interpolates data acquired at a distance only 180 degrees
away from the location of the reconstructed slice - ✔✔180 degree interpolation 180LI
✔✔The primary advantage of prospective ECG gating for cardiac CT over retrospective
ECG gating is - ✔✔reduction in patient radiation dose
✔✔Which of the following is NOT an advantage of retrospective ECG gated cardiac -
✔✔increased motion artifacts
✔✔The main benefit of prospective ECG gating is the potential for up to a what percent
reduction in patient radiation dose. - ✔✔70% reduction
✔✔What requires a steady heartbeat of limit motion artifact - ✔✔Prospective ECG
gating
✔✔What is the term that is the evaluation of cardiac fuction and is not possible because
data is acqured only during diastole - ✔✔Prospective ECG gating
✔✔With a cardiac CT, the typical target enhancement would be considered which of the
following?
In a range of 40-80 HU
In a range of 100-150 HU
In a range of 10-50 HU
In a range of 200-300 HU - ✔✔In a range of 200-300 HU
image : cardiac CT
✔✔Which of the following is an advantage of prospective ECG triggered cardiac CT -
✔✔reduced radiation exposure
✔✔Which of the following is a typical cardiac CT pitch value - ✔✔1.5
✔✔A CT scan is taken through the pelvis. The CT numbers between the hip bones are
significantly decreased. The most reasonable explanation for this observation is -
✔✔Beam hardening
✔✔Phantom measurement of the uniformity of a CT system is performed primarily to
assess the negative effects of - ✔✔beam hardening
, ✔✔This is a term that occurs as low-energy xray photons are absorbed when the beam
passes through the patient. - ✔✔Beam hardening
✔✔The average photon energy of the beam increases along the path and may result in
a loss of system uniformity - ✔✔Beam hardening
✔✔Which of the following is true regarding beam hardening artifacts in CT images? -
✔✔They result in an image that is darker centrally than peripherally
✔✔This the term 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 water-filled
phantom. - ✔✔uniformity
✔✔Which of the following units is used to quantify absorbed dose - ✔✔grays (Gy)
✔✔This term describes the amount of xray energy absorbed in a unit of mass -
✔✔absorbed dose
✔✔When doing CT Coronary Calcium Screening, what does a score of 7 indicate?
Minimal plaque.
Mild plaque.
Moderate plaque.
Extensive plaque - ✔✔Correct Answer:
Minimal plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, A score of 0 indicates - ✔✔no
evidence of plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, 1-10 is - ✔✔minimal plaque
https://www.examedge.com
✔✔When doing CT Coronary Calcium Screening, 11-100 indicates - ✔✔mild plaque
https://www.examedge.com
