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