MR Distortion Service (ADNI)
MR Distortion and Image Quality Service (ADNI)

Image Owl’s automated cloud-based service can measure changes in MR scanner spatial distortion by analyzing images of the Magphan® Quantitative Imaging, or ADNI (Alzheimer’s Disease Neuroimaging Initiative), phantom.

For information on the Magphan® Quantitative Imaging Phantom, please visit The Phantom Laboratory’s website.

The History
The MR Distortion Service was developed to fulfill a need to process the data obtained from the Magphan® Quantitative Imaging (ADNI) phantom.  The Phantom Laboratory worked with Richard Mallozzi, Ph.D., a physicist with General Electric’s MR Research Facility, to develop the original prototype phantoms. The distortion measurement methodology was adopted by the ADNI scientific group for use in their study for scanner performance measurement and validation of longitudinal data. Image Owl developed the MR Distortion and Image Quality Service to address the needs of groups that wanted to follow the ADNI approach for MR distortion measurements. Numerous data reporting presentation and trend evaluation features have been added to the service to fulfill the needs of our customers.

The Process
The entire Magphan® Quantitative Imaging phantom is scanned and the set of DICOM images are uploaded to the Image Owl server for processing. Actual and scanned sphere positions are compared yielding up to fourth-order measurements of scanner distortion. The service also provides statistical analysis and trend data for signal-to-noise, scaling, and non- linearity. Additionally, 3-D representations and 2-D scatter plots of sphere locations employ gray and color scales to aid in the visualization of scanner distortion.

The service provides image processing, data analysis, and visualizations of distortion measurements. Database tools offer a comprehensive picture of scanner performance for individuals responsible for implementing single or multiple site quality assurance programs, as well as those involved in longitudinal studies.

  • Phantom images are uploaded to the secure web-accessed Image Owl server from any location with internet access.
  • The images are processed and statistical data for each scan is available.
  • Graphs for each processing variable can be created for a given period of time.
  • Tolerance limits can be set for each scanner or a collection of scanners grouped together into a study.
  • Data can be sorted and stored by study or protocol for optimal trend analysis.
  • Site and study reports give an overview of the status of each scanner or study
  • group respectively. Data for each variable can be selected for more detailed analysis.
  • 2-D scatter plots and 3-D representations of sphere locations employ gray and color scales for visualization of the distortion field.
  • Automated email alerts are available for out of specification results.
  • To support and encourage consistent quality assurance testing, Image Owl provides unlimited scan uploading, access, and data storage. The service is offered as a yearly contract per scanner.
Please contact us for pricing and registration information.
Phone (USA): 518 692-0226

For a PDF document with more information about Image Owl’s MR Distortion service click on the link below:

MR Distortion Service Information