Artefacts

• Important if images are being used for attenuation correction

• Streaking

  • due to inconsistency in a small group of readings
    • Partial Volume
    • Photon starvation
    • Metal artefacts
    • Patient movement

• Shading artefacts

  • due to helical interpolation

• Rings

  • due to errors in individual detector calibration
    • Detector ring artefacts

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