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問題一覧
1
Noise artifact are visually observed as
Grayniness
2
What is the usual characteristics of aliasing artifact?
Fines, Stripes or Bands
3
What is the result of detector malfunction in ct scan
Ring Artifact
4
Aliasing in ct is caused by which factor?
Insufficient Sampling Frequency
5
What causes noise artifact in ct imaging?
Low photon counts
6
Which type of CT artifact occurs due to beam hardening?
Beam Hardening
7
How can motion artifact be minimize
Patient Immobilization
8
What artifact appears as starburst patterns
Metallic Materials
9
Partial Volume artifact is more likely occur in which imaging scenario
Thick slices with low contrast resolution
10
Aliasing artifact occurs due to which factor
Low Sampling Rates
11
Beam-hardening is most noticeable in which type of tissue?
High Density Tissues
12
What is the cause of photon starvation artifact?
Insuffiecient Xray photons reaching the detecter
13
Which scanning adjustments reduces beam-hardening artifacts?
Use of bow tie filters
14
Metalic artifact appear as of which of the following?
Starburst
15
What does the beam-hardening look like
Streak & Dark Bands
16
What adjustments can help to reduce aliasing artifact?
Increase sampling frequency
17
Which interpolation method is most commonly used in helical ct?
180 linear interpolation
18
What reconstruction method is prone to streak artifact?
Filtered back projection
19
What patient factor can lead to star effect
Metallic Implants
20
How can noise artifact be minimized?
Increase tube current
21
What technique can reduce metalic artifacts?
Metal artifact reduction software
22
Which artifact results from overlapping during helical scanning?
Interpolation Artifact
23
Incomplete projections during a ctscan leads to which artifact?
Streaking
24
Which imaging modality is LEAST affected by metalic implants
Xray
25
Which method can reduced partial volume artifacts?
Use thinner slices
26
Interrutive??? Reconstruction reduces which artifact type most effectively?
Noise Artifact
27
Beam-hardening correction algorithm are applied during which phase?
Image Reconstruction
28
What causes partial volume artifact in ct imaging?
Multiple tissues between single voxel
29
Which technique can help reduce beam-hardening artifacts
All of the Above
30
How can ring artifact be reduced
Calibration of Detector
31
What artifact is caused by patient motion?
Blurring/Ghosting