Magneto-phosphenes are caused by induced potentials in the retina, that result in visual stimulation, appearing as flashing lights. In the MR environment, magneto-phosphenes have been encountered with higher gradient strengths and longer slew times than are typically encountered in MRI. However, in a prototype head-only gradient coil we were able to repeatably induce magneto-phosphenes in four subjects. We then tested the effects of slew times, external light, and eye direction on the subject’s perception of magneto-phosphenes, finding that slew times had little effect but dimming lights and changing eye direction raised thresholds in most cases.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Keywords