Improved patient specific seizure detection during pre-surgical evaluation

ObjectiveThere is considerable interest in improved off-line automated seizure detection methods that will decrease the workload of EEG monitoring units. Subject-specific approaches have been demonstrated to perform better than subject-independent ones. However, for pre-surgical diagnostics, the traditional method of obtaining a priori data to train subject-specific classifiers is not practical. We present an alternative method that works by adapting the threshold of a subject-independent to a specific subject based on feedback from the user.MethodsA subject-independent quadratic discriminant classifier incorporating modified features based partially on the Gotman algorithm was first built. It was then used to derive subject-specific classifiers by determining subject-specific posterior probability thresholds via user interaction. The two schemes were tested on 529 h of intracranial EEG containing 63 seizures from 15 subjects undergoing pre-surgical evaluation. To provide comparison, the standard Gotman algorithm was implemented and optimised for this dataset by tuning the detection thresholds.ResultsCompared to the tuned Gotman algorithm, the subject-independent scheme reduced the false positive rate by 51% (0.23 to 0.11 h−1) while increasing sensitivity from 53% to 62%. The subject-specific scheme further improved sensitivity to 78%, but with a small increase in false positive rate to 0.18 h−1.ConclusionsThe results suggest that a subject-independent classifier scheme with modified features is useful for reducing false positive rate, while subject adaptation further enhances performance by improving sensitivity. The results also suggest that the proposed subject-adapted classifier scheme approximates the performance of the subject-specific Gotman algorithm.SignificanceThe proposed method could potentially increase the productivity of offline EEG analysis. The approach could also be generalised to enhance the performance of other subject independent algorithms.

► We present a method for adapting a subject-independent seizure detection system to subject-specific ones using feedback from the EEG technologist. This improves seizure detection performance, and unlike traditional subject-specific systems, it does not require obtaining a priori data to train the system. ► The method was tested on 529 h of intracranial EEG containing 63 seizures from 15 subjects. Compared to the standard Gotman algorithm, the subject-specific scheme improved sensitivity from 53% to 78%, and decreased false positive rate from 0.23/h to 0.18/h. This is close to the performance of the subject-specific standard Gotman algorithm. ► The proposed method could potentially increase productivity of offline EEG ana1ysis.