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Dr. Brian Renner
Clinical Education Specialist
Siemens Healthineers
Cary, NC



May 22, 2019

May 31, 2024


6018-101 MRI Artifacts Overview

Continuing Education for MRI Technologists, Radiologic Technologists, and other Medical Imaging Professionals.


This online activity was recorded in 2018 at the 13th Annual ARMRIT Meeting and Seminar.

Format: On-line Seminar Lectures Certificates of Credit accepted by American Registry of Magnetic Resonance Imaging Technologists (ARMRIT) and the American Registry of Radiologic Technologists (ARRT)
RT Credit: 1.00 ARRT Category A
Tuition: $15

Educational Objectives
At the conclusion of this activity, the learner should be better able to:

  • Participants will know & understand the different imaging artifacts in MRI, to recognize, avoid & repair
  • Participants will know & understand Motion
  • Participants will know & understand Geometric distortion
  • Participants will know & understand Phase aliasing
  • Participants will know & understand Magnetic susceptibility
  • Participants will know & understand Chemical shift
  • Participants will know & understand Gibbs and truncation


  • What is an artifact?
    1. What does it mean?  b.  What will we discuss?  C.   What will we be good at afterwards?
  • Motion 
    1. What does it look like? 
      1. Patient Motion     ii. Pulsatile Flow
    2. Why does this happen?
      1. Phase encoding process    ii.  Resulting motion artifact
    3. Sequences with differing sensitivity to motion
      1. Why are some more and some less sensitive?
    4. What can we do to help?
  • Geometric distortion
    1. What does it look like?
      1. Volumetric inherent field distortion      ii.    In-plane distortion
    2. Most common causes.
      1. How is BW related?    2.  What IS BW      3. Inherent field distortion
        1. Why is it distorted?    2.    Distortion correction      3.   Shim
    3. What can we do to help?
  • Phase aliasing
    1. Why does it happen?
      1. Phase encoding process quick review.
      2. When signals repeat phase encoding, wrap appears.
    2. Also in 3D, slice direction.
      1. Why does this happen?
    3. What can we do to help?
  • Magnetic susceptibility
    1. What is this?
    2. What does it look like?
    3. Why does it appear as it does?
      1. Frequency shifts from local field shifts
      2. Phase shifts from local field shifts
      3. Through-plane signal piling
    4. Parameters and factors involved
      1. Density of material  ii. Bandwidth (hz/px)  iii. Refocusing pulses   iv. Echo spacing
    5. What can we do to help?
  • Chemical shift
    1. What is it and what does it mean?
      1. Due to difference in frequency of fat and water
    2. Type 1 and Type 2
      1. What do they look like?
      2. Why do they create an image artifact?
      3. Why do they look different from each other?
    3. What parameters are involved?
    4. How can we help?
  • Gibbs and truncation
    1. Why named such?
    2. What does this mean?
    3. What does it look like?
      1. Clipping of the signal data. Over and under estimations
    4. What is the difference?
    5. Parameters involved?
    6. What can we do to help?
  • Summary

Continuing Education Credit
This program has been approved by the Association for Medical Imaging Management (AHRA) for 1.0 hours ARRT Category A continuing education credit. This course has been been approved for CRA renewal credit under the OM and CI domain(s).


Certificates of Credit are accepted by the American Registry of Magnetic Resonance Imaging Technologists (ARMRIT) and the American Registry of Radiologic Technologists (ARRT).

ICPME accepts American Express, MasterCard, and Visa.

Tuition for this course includes unlimited access to the course and your Certificate of Credit.

Please note: tuition payments are non-refundable.

How to Enroll and Participate
Estimated time to complete this activity is 1.00 hours.

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About the American Registry of
Magnetic Resonance Imaging Technologists

Because MRI is a Specialty

The mission of the American Registry of Magnetic Resonance Imaging Technologists (ARMRIT) is to recognize individuals qualified as specialists and to promote high standards of patient care and safety in the diagnostic medical imaging modality of Magnetic Resonance Imaging (MRI) technology including: interventional MRI, cardiovascular MRI, functional MRI, and MRI breast imaging.

ARMRIT is the first certifying organization to:
1.    Recognize MRI technology as a distinct medical imaging specialty utilizing non-ionizing radiation.
2.    Require MRI clinical experience and competency for eligibility.
3.    Promote formal MRI education with MRI clinical training.
4.    Recognize MRI schools that offer full-time educational program leading to a career in MRI.

Certification through the Registry is open to qualified technologists in all imaging fields who have documented MR clinical experience and/or formal education completed through schools dedicated to MRI technologists.

For more information about ARMRIT or to apply for certification, visit

Participants have an implied responsibility to use the newly acquired information to enhance patient outcomes and their own professional development. The information presented in this activity is not meant to serve as a guideline for patient management. Any procedures, medications, or other courses of diagnosis or treatment discussed or suggested in this activity should not be used by clinicians without evaluation of their patient’s conditions and possible contraindications and/or dangers in use, review of any applicable manufacturer’s product information, and comparison with recommendations of other authorities.