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Charles G. Nyman, ARMRIT
MRI Quality Assurance Coordinator
Memorial Sloan Kettering Cancer Center
New York, NY




March 21, 2018

March 31, 2024



PC: Win7/Win8, Pentium processor or faster, at least 2GB RAM, Internet Explorer version 10/11, Mozilla FireFox version 33.0.

MAC: OS version 10.8/10.9, Intel processor, at least 2GB RAM, Safari version 6.2, FireFox 33.0

6017-102 Diffusion Tensor Imaging (DTI) /
Diffusion Weighted Imaging (DWI)


This online activity was recorded in 2017 at the 12th Annual ARMRIT Meeting and Seminar.

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

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: $15.00

Diffusion Tensor Imaging (DTI) collects information from all the diffusion weighted images (in however many directions was chosen) and tries to sum up all that information about where water can “diffuse to” in each voxel. We can only see that good diffusion exists (because of signal loss) along the direction in which a gradient is applied. So if we want to know the diffusion in all directions, we have to get many diffusion weighted images with diffusion weighting gradients in different directions. Ideally “all directions” would mean every possible direction on a sphere, but in practice we do, say, 12, 16, or 32 gradient directions (or more).

Diffusion-weighted MRI (DWI) is a well-established technique with numerous important applications in clinical diagnostics of the brain and the body as well as in research settings. The defining property of DWI is its sensitivity to the microscopic thermal random motion (the so-called self-diffusion) of molecules, e.g. of water molecules in tissue. This thermal motion causes an attenuation of the measured DWI signal, which can be evaluated qualitatively, i.e. in terms of image contrast, or quantitatively by calculation of the diffusion coefficient as the physical quantity describing molecular self-diffusion.

Educational Objectives
At the conclusion of this activity, the learner should know:

  • How DWI is able to characterize tissue
  • How DTI gives us directional’s able to characterize tissue
  • Why and what b-values are important.
  • Diffusion and Intravoxel Incoherent Motion (IVIM)
  • Types of deceases we currently use Whole Body Diffusion

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 domain.

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


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

Please note: tuition payments are non-refundable.

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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.