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CT image production post course assessment correctly answered to pass
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CT image production post course assessment
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CT image production post courseassessment
The phantom pictured below contains only water. Based on the ROI readings what problem should be
reported to the medical physicist? - correct answer ✔✔Unacceptable uniformity
What artifact is visible in the image below in the posterior portion of the patient's abdomen? - correct
answer ✔✔Beam hardening artifact
What CT artifacts are demonstrated in this image? - correct answer ✔✔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? - correct answer ✔✔This is NOT a hippa violation
Compared to a pitch of 1.2, a pitch of 1 will result in
1. Increased dose
2. increased spatial resoluation
3. increased total scan time - correct answer ✔✔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? - correct answer ✔✔Archive server
Consider a PACS network running through a traditional internet network. What is the primary advantage
of this network architecture? - correct answer ✔✔The PACS archive server can be accessed from any
internet-connected computer
What difference in image processing accounts for the visible difference between these two images of the
brain? - correct answer ✔✔Back projection filter
,During spiral scaling 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: - correct answer
✔✔interpolation
Matrix size in CT refers to: - correct answer ✔✔The number of pixels in the matrix
Consider a CT image that was initially displayed with a 300 WW and a 30 WL. DECREASING the WL from
30 to 0 will have what effect on the image? - correct answer ✔✔decreased brightness
If the pitch is greater than one, this results in: - correct answer ✔✔Missing view in the scan data
The contrast resolution of a CT system is recorded with which of these units? - correct answer ✔✔HU
Compared to a pitch of 1, a pitch of 1.137 will have
1. decreased scan time
2. decreased pt. dose
3. decreased spatial resolution - correct answer ✔✔1. decreased scan time
2. decreased pt. dose
3. decreased spatial resolution
The main DISADVANTAGE of using thick detector rows is - correct answer ✔✔decreased contrast
reolution
ideally, the patient worklists on imaging equipment should be automatically populated from examination
request placed though the: - correct answer ✔✔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? - correct answer
✔✔multiplaner reformation
, What is the principle function of the data acquisition system (DAS) in CT? - correct answer
✔✔Reconstruct raw data into image data
This image shows excessively high contrast. Improving the contrast could be accomplished by: - correct
answer ✔✔Increasing the WW
Cone beam artifact is increased under what circumstances? - correct answer ✔✔Use a wide X-ray beam
A protocol designed for viewing boney injures to the thorax should use what kind of reconstruction
algorithm? - correct answer ✔✔Edge enhancing 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 - correct answer ✔✔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 - correct answer ✔✔decreased image quality
Ring artifact can be the result of - correct answer ✔✔using a large display field of view
The physical size of the X-ray beam is controlled by: - correct answer ✔✔Pre patient collimators
Which of these images is displayed with a WW of 2500 and WL of 600? - correct answer ✔✔image b
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