A high-intensity, goggle-mounted flash stimulator for short-latency visual evoked potentials.
The few studies that have been done on short-latency, subcortical visual evoked potentials (SVEPs) have all used stroboscopic flashes as the evoking stimulus. The dimensions of the stimulator, the acoustical artifacts and the photic spread to the examination room limited the use of SVEPs to research laboratories. With the advent of high-efficiency light-emitting diodes (LEDs), high-intensity flashes can now be generated from goggle-mounted LEDs. In this study, a goggle-mounted high-intensity stimulator was constructed and its flashes used to evoke SVEPs. The reproducibility of SVEPs across subjects and the ease of using the high-intensity LED flash stimulator make them a promising candidate for testing subcortical visual pathway function in the operating room.
Non-metallic VEP stimulator without interference in CT scanning for neurosurgical operation
Non-metallic flash-type stimulators for monitoring visual evoked potential, named as the Fiber-Eyes, are proposed. Conventional VEP stimulators are comprised of LEDs and the print circuits, i.e. metallic materials, inside the stimulator. Proposed Fiber-Eyes are made from plastic optical fibers, silicone rubber, and external light source. Thus the Fiber-Eyes can be used together with CT scanning without interference in the image due to not use of the metallic parts during neurosurgical operations. They do not also radiate heat because the flash light for stimulus is supplied through the fibers, and thus it can avoid desiccation of the bulbar conjunctiva of patient in the operation.
Liquid state 1H high field NMR in food analysis.
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