MOSBY CT UPDATED FINAL PAPER QUESTIONS AND
ANSWERS SURE A+
✔✔A CT scanner with poor contrast resolution or low sensitivity has difficulty separating
- ✔✔tissues whose linear attenuation coefficients are nearly equal
✔✔What is the basic physical quantity being measured by a CT system - ✔✔Linear
attenuation coefficient
✔✔Assume the linear attenuation coefficient is 0.20 cm-1 for water and 0.40 cm-1 for
tissue within a given voxel. What is the CT number in Hounsfield units for the pixel
representing this voxel? - ✔✔+1,000....Equation { (.4-.2) /.2} x 1000
✔✔What fraction of monoenergetic x-rays will be absorbed by a 20-cm thick material
having a linear attenuation coefficient of 0.05 cm-1? - ✔✔0.63
✔✔The contrast resolution of CT is approximately ? % - ✔✔0.3 to 0.6
✔✔This term describes the ability CT scanner to differentiate objects with MINIMAL
differences in attenuation coefficients - ✔✔contrast resolution
✔✔What is the term for resolution of a CT scanner referred to as the system's ability to
differentiate objects with SIMILAR densities. - ✔✔contrast resolution
✔✔In order to pass ACR CT accreditation, the CT scanner's adult head protocol must
be within - ✔✔1.0
✔✔The QC test for the average CT number for water should be done - ✔✔Daily
✔✔The following are all basic tenets of a QC program for computed tomography
scanner - ✔✔*QC test must be conducted regularly
*Accurate record keeping
*all test results must be interpreted promptly
✔✔Using the ACR CT accreditation phantom, module 3 is used to measure which of the
following - ✔✔CT number uniformity
✔✔The following QC test should be done on a monthly basis - ✔✔high contrast
resolution
✔✔The CT number at the center of a uniformly filled water phantom should ideally be -
✔✔0
,✔✔The ACR CT accreditation phantom is designed to perform QC measurements of -
✔✔*positioning accuracy and light accuracy alignment only
*CT number accuracy and slice thickness only
*low contrast resolution, CT number uniformity, and high contrast resolution
✔✔The ACR tolerance limit for the CT number accuracy for water is - ✔✔+-7HU or +-5
preferred
✔✔The test for the average CT number of water should be tested at - ✔✔*acceptance
*daily
✔✔The ACR tolerance limit for the CT number uniformity is which of the following -
✔✔The center CT number must be between plus or minus 7HU plus the abdomen
protocol must be used
✔✔To evaluate low contrast resolution, phantoms are scanned using different ? settings
- ✔✔mAs
✔✔For an increase from 200 mA to 400 mA in a CT exam, the result would be to -
✔✔Increase low contrast resolution
✔✔This ability is also commonly referred to as the low contrast resolution or the
sensitivity of the CT scanner - ✔✔contrast resolution
✔✔The major advantage of a CT scanner over a screen-film radiography system is -
✔✔Better low contrast discrimination
✔✔For CT images, all of the following factors improve the visibility of large, low-contrast
lesions except? - ✔✔Smaller pixel sizes
✔✔As the iodine concentration ? the viscosity of the substance will ? - ✔✔increase,
increase
✔✔A fluid with a high viscosity is relatively - ✔✔thick and flows slowly
✔✔The viscosity of a solution may be changed by regulating - ✔✔temperature
✔✔A patient with a temperature over ______ is considered to have a fever.
98.6.
96.8.
99.8.
, 100. - ✔✔Correct Answer:
99.8
www.examedge.com
✔✔The body temperature fluctuates, and the normal range is between - ✔✔96.8 and
99.8.
www.examedge.com
✔✔A patient has a fever once the temperature rises above ?. Temperatures are likely to
be higher as it grows later. - ✔✔99.8
www.examedge.com
✔✔Which of these describes a liver window setting?
Approximate width of 275 and window level 90.
Approximate width of 150 and window level 70.
Approximate width of 305 and window level 50.
Approximate width of 80 and window level 90. - ✔✔Approximate width of 150 and
window level 70.
www.examedge.com
✔✔The use of the liver window makes it easier to view subtle - ✔✔liver lesions
www.examedge.com
✔✔Although it may be a bit more difficult to see subtle liver lesions, a ? can also be
used. - ✔✔routine soft-tissue window setting
www.examedge.com
✔✔Contrast enhancement phases of the liver include which of the following -
✔✔*arterial
*portal venous
*equilibrium phase
*early arterial
*delayed phases
, ✔✔Malignant neoplasms of the liver include which of the following - ✔✔*hepatocellular
carcinoma HCC
✔✔Malignant neoplasms of the liver include which of the following - ✔✔*hepatocellular
carcinoma HCC
✔✔What is the most common malignant neoplasms of the liver - ✔✔hepatocellular
carcinoma HCC and metastases
IMAGE IS metastases
✔✔Hemanglomas and focal nodular hyperplasia FNH are both examples of what types
of tumors - ✔✔benign hepatic tumors
✔✔Hemanglomas - ✔✔
✔✔focal nodular hyperplasia FNH - ✔✔
✔✔A patient has a severe vagal reaction to iodinated contrast material that includes
bradycardia. Initial treatment my consist of - ✔✔atropine aka Atreza, Sal-Tropin
✔✔A patient has a severe vagal reaction to iodinated contrast material that includes
bradycardia should be given a treatment of - ✔✔*treatment includes increasing blood
pressure with IV fluids
*intravenous administration of atropine to block vagal stimulation of the heart
✔✔zygoapophyseal joints may be referred to as - ✔✔facet joints
✔✔This joint is the articulation between the inferior articular process of one vertebra
with the superior articular process of the next - ✔✔zygoapophyseal
✔✔The average CT value for blood is approximately - ✔✔+45 HU Hounsfield units
✔✔Differentiation between the duodenum and head of the pancreas is best
accomplished with - ✔✔*an oral contrast agent administrated 30-45 minutes prior to
scanning
*placement of the patient in the right lateral decubitus position prior to scanning
✔✔When differentiating the between the duodenum and head of the pancreas why is it
good to place the patient in the right lateral decubitis position - ✔✔*the right lateral
decubitus position is helpful in ensuring opacification of the duodenum which surrounds
the pancreatic head
ANSWERS SURE A+
✔✔A CT scanner with poor contrast resolution or low sensitivity has difficulty separating
- ✔✔tissues whose linear attenuation coefficients are nearly equal
✔✔What is the basic physical quantity being measured by a CT system - ✔✔Linear
attenuation coefficient
✔✔Assume the linear attenuation coefficient is 0.20 cm-1 for water and 0.40 cm-1 for
tissue within a given voxel. What is the CT number in Hounsfield units for the pixel
representing this voxel? - ✔✔+1,000....Equation { (.4-.2) /.2} x 1000
✔✔What fraction of monoenergetic x-rays will be absorbed by a 20-cm thick material
having a linear attenuation coefficient of 0.05 cm-1? - ✔✔0.63
✔✔The contrast resolution of CT is approximately ? % - ✔✔0.3 to 0.6
✔✔This term describes the ability CT scanner to differentiate objects with MINIMAL
differences in attenuation coefficients - ✔✔contrast resolution
✔✔What is the term for resolution of a CT scanner referred to as the system's ability to
differentiate objects with SIMILAR densities. - ✔✔contrast resolution
✔✔In order to pass ACR CT accreditation, the CT scanner's adult head protocol must
be within - ✔✔1.0
✔✔The QC test for the average CT number for water should be done - ✔✔Daily
✔✔The following are all basic tenets of a QC program for computed tomography
scanner - ✔✔*QC test must be conducted regularly
*Accurate record keeping
*all test results must be interpreted promptly
✔✔Using the ACR CT accreditation phantom, module 3 is used to measure which of the
following - ✔✔CT number uniformity
✔✔The following QC test should be done on a monthly basis - ✔✔high contrast
resolution
✔✔The CT number at the center of a uniformly filled water phantom should ideally be -
✔✔0
,✔✔The ACR CT accreditation phantom is designed to perform QC measurements of -
✔✔*positioning accuracy and light accuracy alignment only
*CT number accuracy and slice thickness only
*low contrast resolution, CT number uniformity, and high contrast resolution
✔✔The ACR tolerance limit for the CT number accuracy for water is - ✔✔+-7HU or +-5
preferred
✔✔The test for the average CT number of water should be tested at - ✔✔*acceptance
*daily
✔✔The ACR tolerance limit for the CT number uniformity is which of the following -
✔✔The center CT number must be between plus or minus 7HU plus the abdomen
protocol must be used
✔✔To evaluate low contrast resolution, phantoms are scanned using different ? settings
- ✔✔mAs
✔✔For an increase from 200 mA to 400 mA in a CT exam, the result would be to -
✔✔Increase low contrast resolution
✔✔This ability is also commonly referred to as the low contrast resolution or the
sensitivity of the CT scanner - ✔✔contrast resolution
✔✔The major advantage of a CT scanner over a screen-film radiography system is -
✔✔Better low contrast discrimination
✔✔For CT images, all of the following factors improve the visibility of large, low-contrast
lesions except? - ✔✔Smaller pixel sizes
✔✔As the iodine concentration ? the viscosity of the substance will ? - ✔✔increase,
increase
✔✔A fluid with a high viscosity is relatively - ✔✔thick and flows slowly
✔✔The viscosity of a solution may be changed by regulating - ✔✔temperature
✔✔A patient with a temperature over ______ is considered to have a fever.
98.6.
96.8.
99.8.
, 100. - ✔✔Correct Answer:
99.8
www.examedge.com
✔✔The body temperature fluctuates, and the normal range is between - ✔✔96.8 and
99.8.
www.examedge.com
✔✔A patient has a fever once the temperature rises above ?. Temperatures are likely to
be higher as it grows later. - ✔✔99.8
www.examedge.com
✔✔Which of these describes a liver window setting?
Approximate width of 275 and window level 90.
Approximate width of 150 and window level 70.
Approximate width of 305 and window level 50.
Approximate width of 80 and window level 90. - ✔✔Approximate width of 150 and
window level 70.
www.examedge.com
✔✔The use of the liver window makes it easier to view subtle - ✔✔liver lesions
www.examedge.com
✔✔Although it may be a bit more difficult to see subtle liver lesions, a ? can also be
used. - ✔✔routine soft-tissue window setting
www.examedge.com
✔✔Contrast enhancement phases of the liver include which of the following -
✔✔*arterial
*portal venous
*equilibrium phase
*early arterial
*delayed phases
, ✔✔Malignant neoplasms of the liver include which of the following - ✔✔*hepatocellular
carcinoma HCC
✔✔Malignant neoplasms of the liver include which of the following - ✔✔*hepatocellular
carcinoma HCC
✔✔What is the most common malignant neoplasms of the liver - ✔✔hepatocellular
carcinoma HCC and metastases
IMAGE IS metastases
✔✔Hemanglomas and focal nodular hyperplasia FNH are both examples of what types
of tumors - ✔✔benign hepatic tumors
✔✔Hemanglomas - ✔✔
✔✔focal nodular hyperplasia FNH - ✔✔
✔✔A patient has a severe vagal reaction to iodinated contrast material that includes
bradycardia. Initial treatment my consist of - ✔✔atropine aka Atreza, Sal-Tropin
✔✔A patient has a severe vagal reaction to iodinated contrast material that includes
bradycardia should be given a treatment of - ✔✔*treatment includes increasing blood
pressure with IV fluids
*intravenous administration of atropine to block vagal stimulation of the heart
✔✔zygoapophyseal joints may be referred to as - ✔✔facet joints
✔✔This joint is the articulation between the inferior articular process of one vertebra
with the superior articular process of the next - ✔✔zygoapophyseal
✔✔The average CT value for blood is approximately - ✔✔+45 HU Hounsfield units
✔✔Differentiation between the duodenum and head of the pancreas is best
accomplished with - ✔✔*an oral contrast agent administrated 30-45 minutes prior to
scanning
*placement of the patient in the right lateral decubitus position prior to scanning
✔✔When differentiating the between the duodenum and head of the pancreas why is it
good to place the patient in the right lateral decubitis position - ✔✔*the right lateral
decubitus position is helpful in ensuring opacification of the duodenum which surrounds
the pancreatic head
