Metal artifact reduction algorithm

Last revised by Andrew Murphy on 30 Mar 2020

Metal artifact reduction (MAR) algorithms are used to improve CT image quality in patients with metalware, however, can be affected by novel artifacts 1-3. There are a number of commercially-available algorithms (in 2019) 1,3:

  • iterative MAR (iMAR) - Siemens
  • MAR for orthopedic implants (O-MAR) - Philips
  • single-energy MAR (SEMAR) - Toshiba/Canon
  • SmartMAR - GE

Practical points

  • images obtained with and without MAR should be reviewed together with multiplanar reformats to avoid misinterpreting newly created artifacts 3

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Cases and figures

  • Case 1: without MAR
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  • Case 1: with MAR
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