CT image production post course assessment || QUESTIONS & ANSWERS 100% PASSED!!
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The phantom pictured below contains only water. Based on the ROI readings what problem should be reported to the medical physicist? correct answers Unacceptable uniformity
What artifact is visible in the image below in the posterior portion of the patient's abdomen? correct answers Beam hardenin...
CT image production post course assessment ||
QUESTIONS & ANSWERS 100% PASSED!!
The phantom pictured below contains only water. Based on the ROI readings what problem
should be reported to the medical physicist? correct answers Unacceptable uniformity
What artifact is visible in the image below in the posterior portion of the patient's abdomen?
correct answers Beam hardening artifact
What two computed tomography (CT) artifacts are demonstrated in the following image?
(Select two) correct answers 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 answers 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 correct answers 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 answers Archive server
Consider a PACS network running through a traditional internet network. What is the
primary advantage of this network architecture? correct answers 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? correct answers 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:
correct answers interpolation
"Matrix size" in computed tomography (CT) refers to which of the following? correct
answers 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? correct answers decreased brightness
If the pitch is greater than one, this results in: correct answers Scan data without overlap or
missing views
The contrast resolution of a CT system is recorded with which of these units? correct answers
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 correct answers 1. decreased scan time
2. decreased pt. dose
3. decreased spatial resolution
What is the main DISADVANTAGE of using thick detector rows? correct answers decreased
contrast resolution
ideally, the patient worklists on imaging equipment should be automatically populated from
examination request placed though the: correct answers 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 answers multiplaner reformation
What is the principle function of the data acquisition system (DAS) in CT? correct answers
Reconstruct raw data into image data
The following image shows excessively high contrast. Improving the contrast could be
accomplished by: correct answers Increasing the WW
Cone beam artifact is increased under what circumstances? correct answers Use a wide X-ray
beam
Which two types of reconstruction algorithm should be used to view bony injuries to the
thorax? (Select two) correct answers 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 correct answers 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 answers decreased image quality
Ring artifact can be the result of correct answers using a large display field of view
What controls the physical size of the X-ray beam? correct answers Pre patient collimators
Which of the following images is displayed with a window width (WW) of 2500 and window
level (WL) of 600? correct answers image b
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