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Tech Projects Virtual Reality Images to Reduce MRI Anxiety

December 1, 2015 By Toshiba

Tunnel in the gantry of the MRI

Toshiba Corporation and Toshiba Medical Systems Corporation have developed a technology for displaying expansive virtual reality images inside the bore1 of MRI systems. High reality images are projected onto a dome-shaped screen (dome screen) in the bore to take the patient’s attention away from the actual examination space. This new technology is a reference exhibit2 at the 101st Scientific Assembly and Annual Meeting of the Radiological Society of North America (RSNA 2015, November 29 to December 4, Chicago).

To reduce the patient anxiety caused by the confined examination space and noise during MRI examinations, Toshiba Corporation and Toshiba Medical Systems Corporation have previously developed a 71-cm large-aperture open-bore MRI system and the Pianissimo quiet scan technology and released them in the market. The newly developed projection technology further improves patient comfort and reduces the patient stress caused by the MRI examination environment.

Patient lying on the table during an examination

A semi-transparent dome screen that is moved in synchronization with the patient table3 is installed inside the bore, and images are projected onto the dome screen and bore cover from a projector, which is installed behind the MRI system, and whose location is unaffected by the magnetic field. The images are reflected by a mirror installed on the patient table and can then be viewed by the patient, providing a visual space that helps take the patient’s attention away from the actual examination space.

The core technologies used in the in-vehicle head-up display4 and ultra-high-presence head-mounted display5 systems developed by Toshiba Corporation are incorporated in the dome screen installed in the bore. In addition to the center field,6 where the colors and shapes of objects are processed, image stimulus is applied to the peripheral field,7 where spatial depth and width and object movements are processed, achieving high reality images with a view angle of as wide as 60° or more. The images reflected by the mirror appear as if displayed on a screen much further away than the actual bore cover, providing an expansive virtual space for the patient in the bore.

About 130° in the vertical direction and approx. 200° in the horizontal direction of the visual field (excluding the center field)

Before starting the examination, the dome screen (on which images are displayed) is located at the entrance of the bore. Since the tunnel cannot be seen, patient anxiety related to the examination space is reduced.

Together with our noise reduction technology, this new technology will help achieve a comfortable patient environment that eases patient anxiety in the bore. We will strive for the early commercial release of this feature.

References
1The tunnel in the gantry of the MRI system
2This technology is under development and not commercially available. Due to regulatory reasons, its future availability cannot be guaranteed.
3The table on which the patient lies during the MRI examination. It is moved into and out of the bore as required according to the progress of the examination.
4Toshiba Review Vol. 66 No. 6 (2011). System for providing drivers with various types of information, such as driving speed and navigation data, by displaying distant transparent virtual images on the windscreen, allowing drivers to check the information while keeping their eyes on the road.
5SID2006, “Hyper Reality Head Dome Projector (HDP) Using LED Light Source”, pp. 2003-2006.
6Central 30° of the visual field
7Approx. 130° in the vertical direction and approx. 200° in the horizontal direction of the visual field (excluding the center field)

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