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VisualSystem

NordicNeuroLab’s VisualSystem is a flexible and convenient solution for presenting visual stimuli in the MR scanner.

 

With sharp images and brilliant colors, the VisualSystem allows the user to easily present high-quality graphics or text to the patient. The VisualSystem connects to standard PC graphics cards and has separate channels for each eye. Using frame sequential presentation, true 3D and stereo stimuli can be displayed.

 

The VisualSystem has been designed with both patient and operator in mind. The patent-pending design fits most head coils and is easy to mount with coil-specific adapters. The adjustable arm allows for fast positioning into the preferred angle of view.

 

 

EyeTracking Camera


The EyeTracking Camera, which is integrated into the VisualSystem and available as an optional add-on feature, provides the necessary hardware to produce a video of the subject’s eye in an MR environment. The core piece is an MR-compatible camera, which, thanks to a built-in infra-red light source, also works in darkness. The obtained composite video signal can be used to simply monitor, or, with the help of eye tracking software, to record and analyze eye movements. As a standard, NNL provides a single camera solution for the monitoring of either the left or the right eye. On request, binocular setups capturing the movements of both eyes are available.

 

fMRI Visual System fMRI Visual System

 

The EyeTacking camera is compatible with the following eyetracking software packages:

Arrington Research Logo SMI Logo

Compatibility testing with other eyetracking software currently underway

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  • Features
  • Technical Specifications
  • VisualSystem in Use
  • Download Data Sheet
  • built-in diopter correction
  • adjustable pupil distance
  • 3D stimuli presentation

Projecting images to the patient’s eyes without the use of fiber-optic cables eliminates the risk of dead or grey pixels. The VisualSystem is connected via a fiber-optic cable entering the magnet room through an available waveguide. In addition, the discomfort of being in the confined space of an MR scanner is minimized for the patient due to the placement of the screen close to the eyes.

VisualSystem

format

SVGA, 800 (x3) x 600 pixels

refresh rate

85 Hz

field of view

30° horizontal, 23° vertical

aspect ratio

4:3

colors

16.7 million

 

EyeTracking Camera

image type

dark pupil

field of view

20 mm diameter

output signal

EIA (NTSC) video signal, 60Hz half frame

output impedance

75Ω
fMRI Visual System in Use fMRI Visual System in Use fMRI Visual System in Use