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CT image production post course assessment questions with correct answers.
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CT image production post courseassessment questions with correct
answers.
The phantom pictured below contains only water. Based on the ROI readings what problem should be
reported to the medical physicist? ANS - Unacceptable uniformity
What artifact is visible in the image below in the posterior portion of the patient's abdomen? ANS -
Beam hardening artifact
What two computed tomography (CT) artifacts are demonstrated in the following image? (Select two)
ANS - Beam hardening artifact
Ring artifact
A technologist review a patient's EMR for evidence of a gadolinium allergy prior to performing a scan
with contrast. is this a hippa violation? ANS - This is NOT a hippa violation
Compared to a pitch of 1.2, a pitch of 1 will demonstrate what two differences? (Select two)
1. Increased dose
2. increased spatial resolution
3. increased total scan time ANS - Increased dose
Increased spatial resolution
Which part of the PACS system houses all of the historic digital image data along with the current digital
data being generated by the modalities? ANS - Archive server
Consider a PACS network running through a traditional internet network. What is the primary advantage
of this network architecture? ANS - The PACS archive server can be accessed from any internet-
connected computer
,What difference in image processing accounts for the visible difference between the following two
images of the brain? ANS - Back projection filter
During spiral scanning, attenuation data from the patient is first organized in a helical pattern. The
process of converting this information into axial sections is accompanied by through: ANS -
interpolation
"Matrix size" in computed tomography (CT) refers to which of the following? ANS - The number of pixels
in the matrix
Consider a computed tomography (CT) image that was initially displayed with a 300 window width (WW)
and a 30 window level (WL). DECREASING the window level from 30 to 0 will have what effect on the
image? ANS - decreased brightness
If the pitch is greater than one, this results in: ANS - Scan data without overlap or missing views
The contrast resolution of a CT system is recorded with which of these units? ANS - HU
Compared to a pitch of 1, a pitch of 1.137 will demonstrate what three differences? (Select three)
1. decreased scan time
2. decreased pt. dose
3. decreased spatial resolution ANS - 1. decreased scan time
2. decreased pt. dose
3. decreased spatial resolution
What is the main DISADVANTAGE of using thick detector rows? ANS - decreased contrast resolution
ideally, the patient worklists on imaging equipment should be automatically populated from
examination request placed though the: ANS - Electronic medical record ( EMR)
, After completing a routine scan of the chest the radiologist request a sagittal image series with 5mm
slices. this request can be completed using which of these imaging techniques? ANS - multiplaner
reformation
What is the principle function of the data acquisition system (DAS) in CT? ANS - Reconstruct raw data
into image data
The following image shows excessively high contrast. Improving the contrast could be accomplished by:
ANS - Increasing the WW
Cone beam artifact is increased under what circumstances? ANS - Use a wide X-ray beam
Which two types of reconstruction algorithm should be used to view bony injuries to the thorax? (Select
two) ANS - Edge enhancing algorithms Smoothing algorithms
Compared to a 2mm reconstruction slice thickness a 1mm slice thickness will result in
1. decreased image noise
2. decreased spatial resolution
3. more total image slices ANS - more total image slices
Which of the following is a disadvantage of accessing the PACS server through the internet on a basic
desktop computer
1. decreased image quality
2. inability to access archived studies
3. increased archived retrieves time ANS - decreased image quality
Ring artifact can be the result of ANS - using a large display field of view
What controls the physical size of the X-ray beam? ANS - Pre patient collimators
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