CT REGISTRY (excluding anatomy) 2 Newest updated Exam
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with accurate detailed solutions || || ||
What determines how much and what section of the collected raw data is used to create an
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image - correct answer✔✔Display field of view
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The "string of beads" artifact is most closely associated with which of the following? -
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correct answer✔✔Maximum intensity projection images
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A patient has a severe vagal reaction to iodinated contrast material that includes
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bradycardia should be given a treatment of - correct answer✔✔*treatment includes || || || || || || || || || || ||
increasing blood pressure with IV fluids || || || || ||
*intravenous administration of atropine to block vagal stimulation of the heart || || || || || || || || || ||
An MDCT image is reconstructed using a 512x512 matrix and a display field of view of 44
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cm. If the detector collimation is set to a section width of 2.5 mm what is the volume of
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each voxel - correct answer✔✔How to solve: The linear dimension of the pixel must first be
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calculated by dividing the DFOV, in mm, by the matrix. This linear pixel dimension is
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squared to yield the pixel area in mm^2. The volume of the voxel may be calculated by
|| || || || || || || || || || || || || || || || ||
multiplying the pixel area by the section width || || || || || || ||
step 1. 44 cm/ 512 =0.0859
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step 2. 0.0859*2.5 mm = 0.2148
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step 3. move the decimal point =2.15 mm^3
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For a particular CT scanner's beam quality, the linear attenuation coefficient for water is
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0.20 cm-1 and for a certain tumor is 0.21 cm-1. What is the CT number of the tumor? -
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correct answer✔✔Equation (.21-.20/.21) × 1000= 50
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, A CT system measures the average linear attenuation coefficient of a voxel of tissue to be
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0.189. The linear coefficient of water for this scanner is 0.181. The CT number assigned to
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the pixel representing this tissue is - correct answer✔✔44 HU
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use equation above || ||
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 - correct
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answer✔✔1
For an increase from 200 mA to 400 mA in a CT exam, the result would be to - correct
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answer✔✔increase low contrast resolution || || ||
The major controlling factor of exam quality for coronary CTA is - correct
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answer✔✔patients heart rate... 65-70 beats per minute yield the best results || || || || || || || || || ||
What is the atomic number of xenon gas? - correct answer✔✔54
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The exaggeration of displayed calcification within the coronary arteries during cardiac
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MDCT study is referred to as - correct answer✔✔blooming
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- the potential overestimation of vessel calcification due to partial volume artifact
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a wide window setting (1500) or improving spatial resolution could help mitigate this effect
|| || || || || || || || || || || || ||
Which of the following section widths would cause the greatest amount of partial volume
|| || || || || || || || || || || || || ||
averaging ||
A. 1 mm || ||
B. 3 mm || ||
|| || || || || || || ||
with accurate detailed solutions || || ||
What determines how much and what section of the collected raw data is used to create an
|| || || || || || || || || || || || || || || || ||
image - correct answer✔✔Display field of view
|| || || || || ||
The "string of beads" artifact is most closely associated with which of the following? -
|| || || || || || || || || || || || || || ||
correct answer✔✔Maximum intensity projection images
|| || || ||
A patient has a severe vagal reaction to iodinated contrast material that includes
|| || || || || || || || || || || || ||
bradycardia should be given a treatment of - correct answer✔✔*treatment includes || || || || || || || || || || ||
increasing blood pressure with IV fluids || || || || ||
*intravenous administration of atropine to block vagal stimulation of the heart || || || || || || || || || ||
An MDCT image is reconstructed using a 512x512 matrix and a display field of view of 44
|| || || || || || || || || || || || || || || || ||
cm. If the detector collimation is set to a section width of 2.5 mm what is the volume of
|| || || || || || || || || || || || || || || || || || ||
each voxel - correct answer✔✔How to solve: The linear dimension of the pixel must first be
|| || || || || || || || || || || || || || || ||
calculated by dividing the DFOV, in mm, by the matrix. This linear pixel dimension is
|| || || || || || || || || || || || || || ||
squared to yield the pixel area in mm^2. The volume of the voxel may be calculated by
|| || || || || || || || || || || || || || || || ||
multiplying the pixel area by the section width || || || || || || ||
step 1. 44 cm/ 512 =0.0859
|| || || || ||
step 2. 0.0859*2.5 mm = 0.2148
|| || || || ||
step 3. move the decimal point =2.15 mm^3
|| || || || || || ||
For a particular CT scanner's beam quality, the linear attenuation coefficient for water is
|| || || || || || || || || || || || || ||
0.20 cm-1 and for a certain tumor is 0.21 cm-1. What is the CT number of the tumor? -
|| || || || || || || || || || || || || || || || || || ||
correct answer✔✔Equation (.21-.20/.21) × 1000= 50
|| || || || ||
, A CT system measures the average linear attenuation coefficient of a voxel of tissue to be
|| || || || || || || || || || || || || || || ||
0.189. The linear coefficient of water for this scanner is 0.181. The CT number assigned to
|| || || || || || || || || || || || || || || ||
the pixel representing this tissue is - correct answer✔✔44 HU
|| || || || || || || || ||
use equation above || ||
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 - correct
|| || || || || || || || || || || || || ||
answer✔✔1
For an increase from 200 mA to 400 mA in a CT exam, the result would be to - correct
|| || || || || || || || || || || || || || || || || || || ||
answer✔✔increase low contrast resolution || || ||
The major controlling factor of exam quality for coronary CTA is - correct
|| || || || || || || || || || || || ||
answer✔✔patients heart rate... 65-70 beats per minute yield the best results || || || || || || || || || ||
What is the atomic number of xenon gas? - correct answer✔✔54
|| || || || || || || || || ||
The exaggeration of displayed calcification within the coronary arteries during cardiac
|| || || || || || || || || || ||
MDCT study is referred to as - correct answer✔✔blooming
|| || || || || || || || ||
- the potential overestimation of vessel calcification due to partial volume artifact
|| || || || || || || || || || || ||
a wide window setting (1500) or improving spatial resolution could help mitigate this effect
|| || || || || || || || || || || || ||
Which of the following section widths would cause the greatest amount of partial volume
|| || || || || || || || || || || || || ||
averaging ||
A. 1 mm || ||
B. 3 mm || ||
