iMAR Iterative Metal Artifact Reduction - Step by Step

iMAR (Iterative Metal Artifact Reduction) Computed Tomography Metal objects – like metal markers, implants, or other hardware – can cause beam hard- ening artifacts when scanned using Computed Tomography. Depending on the density and size of the metal, the resulting streak artifacts can make diagnostic evaluation of the area challenging. Iterative Metal Artifact Reduction – iMAR – can reduce the effects of metal artifacts and subsequently improve the Hounsfield number accuracy in a wide vari- ety of clinical situations. iMAR is implemented as an additional reconstruction of existing data; therefore, dedicat- ed iMAR protocols are not necessary as it can be added on to any data set as long as the original RAW data is available. 1. On the Recon parameter card, Recon job 1 2 3 4 5 6 7 8 Series description ABD_PEL 3.0 MPR cor click the iMAR icon. Slice 3.0 mm / Recon job type . Axial 3D ADMIRE O Recon axis coronal Kernel B26f medium smo - iMAR Type MPR FAST M Window Abdomen iterative Metal Artifact Reduction 2. From the Artifact correction drop- down list, select an available op- tion. Recon job 1 2 3 4 5 6 7 6 Series description ABD_PEL 3.0 MPR cor Slice 3.0 mm Advanced reconstruction options ADMIRE 3. Click the iMAR icon again to close Kernel B26f medium smo- iMAR Artifact correction None FAST M Window Abdomen None the Artifact correction list. Routine Neuro coils Dental fillings Spine implants • To deactivate iMAR, select None from FOV Shoulder implants the Artifact correction list. 366 mm x 567 mm Image order Pacemaker Thoracic coils Hip implants No. Extremity implants Comments 4. Start the reconstruction. Routine Scan Recor Auto Tasking Unrestricted Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2018 SIEMENS Master Template: EFF Date 22 Aug 17 | HOOD/HILS HOOD05162002647849 Healthineers Jobaid: Effective Date: 12/17/2019 | HOOD/HILS HOOD05162003049962 Job Aid | iMAR – Iterative Metal Artifact Reduction Effective Date: 12/17/2019 | HOOD/HILS HOOD05162003049962 NOTES: • The image impression of images which are reconstructed with iMAR can differ from imag- es which are reconstructed with a conventional method. Furthermore, the iMAR algo- rithm can occasionally introduce artifacts, particularly in the close vicinity of metal im- plants. Therefore, it is recommended to perform an additional conventional image recon- struction. Compare the iMAR images with the conventional images side-by-side. • Image reconstruction with iMAR is not possible at high kernel sharpness levels. In these cases, the iMAR icon is dimmed. • iMAR is available for the reconstruction jobs of most modes except for the following modes:  i-Fluoro  Control scans  Real Time Display  CARE Bolus CT  TestBolus  Osteo • Do not load images that were reconstructed with iMAR into syngo Osteo CT and syngo Calcium Scoring. • Reconstruction with iMAR takes longer than conventional reconstruction. Consider this when choosing iMAR. • The following labels are displayed in the image comment area of the reconstructed imag- es:  For Neuro coils: iMARne  For Dental fillings: iMARde  For Spine implants: iMARsp  For Shoulder implants: iMARsh  For Pacemaker: iMARpa  For Thoracic coils: iMARth  For Hip implants: iMARhi  For Extremity implants: iMARex • For series descriptions of iMAR recon jobs, the suffix iMAR is added. • The suffix is not shown in the Recon parameter card. Unrestricted Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2018 Page 2 of 3 Job Aid | iMAR – Iterative Metal Artifact Reduction Effective Date: 12/17/2019 | HOOD/HILS HOOD05162003049962 Please note that the learning material is for training purposes only! For the proper use of the software or hardware, please always use the Operator Manual or Instructions for Use (herein- after collectively “Operator Manual”) issued by Siemens Healthineers. This material is to be used as training material only and shall by no means substitute the Operator Manual. Any material used in this training will not be updated on a regular basis and does not necessarily reflect the latest version of the software and hardware available at the time of the training. The Operator's Manual shall be used as your main reference, in particular for relevant safety information like warnings and cautions. Note: Some functions shown in this material are optional and might not be part of your system. 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Copyright © Siemens Healthcare GmbH 2018 ………………………………………………………… Siemens Healthineers Headquarters Siemens Healthcare GmbH Henkestr. 127 91052 Erlangen, Germany Telephone: +49 9131 84-0 siemens.com/healthineers Unrestricted Published by Siemens Healthcare GmbH © Siemens Healthcare GmbH, 2018 Page 3 of 3