Overview Detection epileptic seizures
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1 Overview Detection epileptic seizures
2 Overview Problem Goal Method Detection with accelerometers Detection with video data Result
3 Problem Detection of epileptic seizures with EEG (Golden Standard) Not comfortable No long time monitoring No monitoring in home environment The Royal Children Hospital Melbourne
4 Goal Comfortable detection of epileptic seizures by means of video and accelerometer monitoring Long term monitoring at home Log seizures (follow up disease) Raise alarm Video monitoring Accelerometer monitoring
5 Method: overview Video data Monitor patients accelerometer/video Accelerometer data Movement Non-movement Seizure Non-seizure Log seizures Raise alarm
6 Method Collect labeled datasets of patients Neurologist labels video/eeg-signals Synchronous logging EEG-signal with video and accelerometer data EEG-signals Accelerometer signals Labels No seizure Seizure No seizure
7 Method: accelerometers 3D-Accelerometers attached to wrists and ankles Receiver Detection algorithm Logging information Alarm generation Neurologist Caregivers
8 Method: accelerometers Acceleration during movement is logged Right arm Left arm Left leg Right leg Accelerometer signals of hyper motor seizure
9 Method: accelerometers Video data Monitor patients accelerometer/video Accelerometer data Movement Non-movement Preprocessing Seizure Non-seizure Log seizures Raise alarm
10 Method: accelerometers Preprocessing/Data reduction Resultant per accelerometer Multiple of standard deviation of frame without non-movement is set as threshold Epochs without movement are discarded data reduction 10-20% acceleration Right arm remains time (s) Noise
11 Method: accelerometers Video data Monitor patients accelerometer/video Accelerometer data Movement Non-movement Preprocessing Seizure Non-seizure Log seizures Raise alarm
12 Method: accelerometers Seizure detection Mean energy of a sliding window Sliding window ~ length of seizure Patient specific detection
13 Method: accelerometers Acceleration² (mg²) 8 x Left arm Threshold th a Acceleration² (mg²) 8 x Right arm Threshold th a Acceleration² (mg²) 0 4 x sample x 10 5 Left leg Threshold th l Acceleration² (mg²) 0 4 x sample x 10 5 Right leg Threshold th l sample x sample x 10 5
14 Method: accelerometers Results Threshold trained on one dataset with 7 seizures ROC-curve to select ideal values Algorithm tested on second dataset, all seizures were detected (12) without false positives
15 Method: video data Algorithm with Optical Flow to detect movement in video recordings Setup has to work under different circumstances in a home environment (e.g. different luminance) Tested in simulation for optimal parameters for algorithm
16 Method: accelerometers Video data Monitor patients accelerometer/video Accelerometer data Movement Non-movement Preprocessing Seizure Non-seizure Log seizures Raise alarm
17 Method: video data Algorithm to detect movement Preprocessing Downsample time Downsample space Optical flow (Horn Schunck) Movement vector in each pixel Calculation of output signal Mean of highest movement pixels
18 Method: video data Simulation Which are ideal parameters for algorithm? Different circumstances Downsample time/space Different camera point of view Compression Different illumination
19 Method: video data Simulation results Downsample in time to 10 fps Downsample in space to 320x240 Downsample for faster execution of algorithm but specific patterns may be lost
20 Method: video data Preprocessing Downsample (25 fps 12.5 fps) Resize (352x x240) Contrast adjustment for video sequences with low contrast
21 Method: video data Algorithm to detect movement Optical flow (Horn Schunck) Calculates movement vectors according to changing pixel intensities Calculate 0.06% highest values Reduces noise
22 Method: video data Calculate mean of these values Set threshold No movement Movement
23 Method: video data Set threshold Label epochs in dataset with movement Calculate ROCcurves to find ideal threshold
24 Method: video data Future work Define features for detection of epileptic seizures Overall future goal Develop stand-alone system to automatically detect seizures
25 Thank you for your attention Questions?
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