System and process for recording ERG, PERG and VEP multifocal electrofunctional responses in real-time
First Claim
1. A process for determining the topography of bioelectric response signals of a visual system of a patient, the patient'"'"'s retina, optical nerve or a projection thereof being at the level of the central cortex, following visual stimulation through a surface arranged in front of the patient'"'"'s eye, wherein an image which comprises a plurality of cells is displayed as stimulation, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of duration (T) formed by a plurality of activation symbols (N), each having a duration (Ts), the m-sequences of the various cells being obtained cyclically from a mother m-sequence, the process determining the total bioelectric response of the visual system, the response associated with each cell being determined by the total response of the visual system using a cross-correlation with a suitable translated version of a mother m-sequence, wherein calculation of the response of each cell is updated at the end of each symbol time (Ts), thereby making it possible to follow the evolution of the calculated response of each cell in real time, without awaiting the end of an m-sequence.
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Abstract
Process and system for determining the topography of bioelectric response signals of a visual system including a patient'"'"'s retina, optical nerve or a projection thereof at the level of the central cortex, following visual stimulation through a surface arranged in front of the patient'"'"'s eye. An image which comprises a plurality of cells is displayed as stimulation, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of duration (T) formed from a plurality of activation symbols (N), each having a duration (Ts), the m-sequences of the various cells being obtained cyclically from a mother m-sequence. The process determines the total bioelectric response of the visual system, the response associated with each cell being determined by the total response of the visual system using a cross-correlation with a suitable translated version of a mother m-sequence. The calculation of the response of each cell is updated at the end of each symbol time (Ts), thereby making it possible to follow the evolution of the calculated response of each cell in real-time, without awaiting the end of an m-sequence.
18 Citations
17 Claims
- 1. A process for determining the topography of bioelectric response signals of a visual system of a patient, the patient'"'"'s retina, optical nerve or a projection thereof being at the level of the central cortex, following visual stimulation through a surface arranged in front of the patient'"'"'s eye, wherein an image which comprises a plurality of cells is displayed as stimulation, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of duration (T) formed by a plurality of activation symbols (N), each having a duration (Ts), the m-sequences of the various cells being obtained cyclically from a mother m-sequence, the process determining the total bioelectric response of the visual system, the response associated with each cell being determined by the total response of the visual system using a cross-correlation with a suitable translated version of a mother m-sequence, wherein calculation of the response of each cell is updated at the end of each symbol time (Ts), thereby making it possible to follow the evolution of the calculated response of each cell in real time, without awaiting the end of an m-sequence.
- 7. A system for determining the topography of bioelectric response signals of a visual system of a patient including the patient'"'"'s retina, optical nerve or a projection thereof at the level of the central cortex, following visual stimulation, the system comprising a display arranged in front of the patient'"'"'s eye, a processor connected to the display for showing an image, as stimulation, including a plurality of cells, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of duration (T) formed by a plurality of activation symbols (N), each having a duration (Ts), the m-sequences of the various cells being obtained cyclically from a mother m-sequence, the system further comprising a sensor and amplifier for determining the total bioelectric response of the visual system, and recording the response on the processor, such that the response associated with each cell is determined by the total response of the visual system using a cross-correlation with a suitable translated version of a mother m-sequence, wherein processor updates the calculation of the response of each cell at the end of every symbol time (Ts), thereby making it possible to follow the evolution of the calculated response of each cell in real-time, without having to wait for the end of an m-sequence.
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15. A program-controlled apparatus for determining the topography of bioelectric response signals of a visual system of a patient, the patient'"'"'s retina, optical nerve or a projection thereof being at the level of the central cortex, following visual stimulation through a surface arranged in front of the patient'"'"'s eye, which performs the steps of:
- (i) displaying an image comprising a plurality of cells as stimulation, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of a first selected duration formed from a plurality of activation symbols, each having a second selected duration, the m-sequences of the various cells being obtained cyclically from a mother m-sequence;
(ii) determining the total bioelectric response of the visual system, the response associated with each cell being determined by the total response of the visual system by a cross-correlation with a suitable translated version of a mother m-sequence, wherein calculation of the response of each cell is updated at the end of each symbol time (Ts), thereby making it possible to follow the evolution of the calculated response of each cell in real-time, without awaiting the end of an m-sequence. - View Dependent Claims (16, 17)
- (i) displaying an image comprising a plurality of cells as stimulation, each cell being activated or deactivated according to a corresponding digital time function represented by a cyclical succession of binary m-sequences of a first selected duration formed from a plurality of activation symbols, each having a second selected duration, the m-sequences of the various cells being obtained cyclically from a mother m-sequence;
Specification