FSP Class-9 - Artifacts

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Author:
flashsmilenet
ID:
297189
Filename:
FSP Class-9 - Artifacts
Updated:
2015-03-21 18:07:04
Tags:
FSP Class Artifacts
Folders:
FSP Class
Description:
FSP Class-9 - Artifacts
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  1. Artifact is...
    ... anomaly on the image
  2. Motion Artifact (list)
    • 1) Voluntary
    • 2) Involuntary
  3. Voluntary Artifact (def)
    • ghosting
    • manifest itself phase (horizontal) encoding direction
  4. Voluntary Artifact (correction)
    Good Pt-Tech communication
  5. Involuntary Artifacts (list)
    • Peristalsis - swallowing
    • Cardiac - heart beet
    • Respiration - breathing
  6. Involuntary Artifacts (corrections)
    • Gating techniques:
    •   1) Respiratory Gating
    •   2) Respiratory Triggering
    •   3) Cardiac Gating
  7. Respiratory Gating
    • Involuntary Artifacts correction
    • Bellows elastic strip in diagonal
    • Ask Pt to hold breath (17-27 sec)
    • system allows to start and end scan
    • Contraindications:
    • COPD and Astma
  8. Respiratory Triggering
    • Involuntary Artifacts correction
    • Reading from Transducer Clip
    • Free breathing automatically
    • R-wave - highest amplitude
    • Cardio Cycle - b/w 2 R-waves
    • Scan at R-wave (highest amplitude)
    • For abdomen, chest, pelvis
  9. If:
    RR=1000ms
    TD=60ms
    TW=40ms
    What is AST?
    AST=1000-(60+40)=900ms
  10. If HB = 60 B/min, how much TR is available?
    • 1) 60*1000=60,000ms
    • 2) 60,000ms/60s=1000ms
    • P - Atrial Systole
    • GRS - Ventricular Systole
    • T - Ventricular Diastole
    • R - highest
  11. AST = ?
    • Cardiac Gating
    • Involuntary Artifacts correction
    • AST - Available Scan Time
    • AST = RR - (TD + TW)
  12. TD - TW - AST - ?
    • Cardiac Gating
    • Involuntary Artifacts correction
    • TD - Delay
    • TW - Window (10% off TD)
    • AST - Available Scan Time
    • AST = RR - (TD + TW)
    • Cardiac Gating
    • Involuntary Artifacts correction
    • TD - Delay
    • TW - Window (10% off TD)
    • AST - Available Scan Time
    • AST = RR - (TD + TW)
  13. Cardiac Gating
    • Involuntary Artifacts correction
    • Reading from ECG Quadtrode
    • White  Black/Gray
    • Green  Red
    • Snow  Smock
    • Grass  Fire
    • P - Atrial Systole
    • GRS - Ventricular Systole
    • T - Ventricular Diastole
    • R - highest
    • TD - Delay
    • TW - Window (10% off TD)
    • AST - Available Scan Time
    • AST = RR - (TD + TW)
    • RR=1000ms
    • TD=60ms
    • TW=40ms
    • AST=1000-(60+40)=900ms

    • If HB = 60 B/min
    • How much TR is available?
    • 60*1000=60,000ms
    • 60,000ms/60s=1000ms
  14. Aliasing or Wraparound artifact
    • wrong FOV is used
  15. Aliasing artifact
    • Wraparound (another name)
    • wrong FOV is used
  16. Wraparound artifact
    • Aliasing (another name)
    • wrong FOV is used
    • Aliasing or Wraparound artifact
    • wrong FOV is used
  17. Aliasing or Wraparound artifact elimination:
    • 1) ↥ FOV
    • 2) using No-Phase Wrap selected on the console
  18. Result of a phase shift difference b/w fat and water
    Chemical shift artifact
  19. Artifact as a small dark or bright border at the interfaces of bone, fat and muscle
    • Chemical shift artifact
  20. As stronger magnet as bigger this artifact
    Chemical shift artifact
  21. Chemical shift artifact
    • small dark or bright border at the interfaces of bone, fat and muscle
    • result of a Phase Shift Difference b/w fat and waterst
    • ronger magnet - bigger artifact
  22. Line along the spinal cord artifact
    • Truncation artifact
    • can mimics a Syrinx pathology
  23. Artifact as a line along the spinal cord
    • Truncation artifact
    • can mimics a Syrinx pathology
  24. Most common in C-spine, but also in T-spine artifact
    Truncation artifact
  25. Artifact mimics a Syrinx
    Truncation artifact
  26. Truncation artifact
    • line along the spinal cord
    • most common in C-spine, but also in T-spine
    • mimics a Syrinx pathology
  27. Splitting of the spinal cord pathology
    • Syrinx
    • occurs in C-T-spine
    • Truncation artifact mimics this pathology
  28. Syrinx
    • splitting of the spinal cord
    • pathology occurs in C-T-spine
    • Truncation artifact mimics this pathology
  29. Metal in the body or on clothing artifact
    Magnetic Susceptibility Artifact
  30. Magnetic Susceptibility Artifact
    • metal in the body or on clothing
    • Magnetic Susceptibility Artifact
    • Metal in the body or on clothing artifact
  31. Pulse sequence better for Pt w prosthetic devices (metal)
    Spin Echo Pulse Sequences are better than Gradient Echoes
  32. Black lines across the image are seen in the inferior aspect of the axial slices
    Cross Excitation artifact
  33. Cross Excitation artifact
    • in axial planes of L-spine
    • lines must be parallel to the disk space
    • w the age and diseases it is not alwas the case - difficult to obtain true axis
    • black lines across the image will be seen in the inferior aspect of the axial slices
    • Solved by:  
    •   1) Apply an Interleave scan method  
    •   2) The slice gap must be reduced to 30% of the slice thickness

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