topic Re: EEG processing in Life Science

EEG processing

viginesh — Tue, 24 Feb 2009 17:18:16 GMT

does any one processed EEG signal to detect epilepsy or any neurological diseases

Re: EEG processing

Steve.J — Tue, 10 Mar 2009 14:32:19 GMT

LabVIEW is used routinely for recording EEG and doing both on-line and off-line analysis for epilepsy, sleep staging, and other tasks. I have been involved in projects for both clinical and research applications on humans and animals.

What is your application? Can you give me more details?

Steve

Re: EEG processing

viginesh — Tue, 10 Mar 2009 16:24:57 GMT

Sir,

My undergraduate project is "processing EEG for neurological disorder". But i could not get definite algorithm to detect diseases. If u ve done anything regarding that, kindly send me. I shall study that and try to do my project.

Thank you in advance sir.

Re: EEG processing

Steve.J — Tue, 10 Mar 2009 17:02:12 GMT

That's a tough subject. Unlike ECG, which has a very periodic waveform with features that directly correspond to heart activity (contraction of atria and ventricles), no such thing exists for EEG. There are some EEG "rhythms" that are detectable at certain locations on the scalp that correspond to relaxation, alertness, deep sleep, etc. but these are the aggragate surface voltages from millions/billions of neurons in the brain. A lot of EEG signal analysis is done in the frequency domain (using FFT processing) to look for relative shifts in power from one band of EEG activity to another over the surface of the scalp. Google "EEG spectral analysis" and you will find many some examples of this type of processing.

Another technique for identifying and locating seizure activity in the brain (often associated with epilepsy) is "spike detection". This technique requires constant on-line analysis of many channels, searching for abnormal "spikes" in the normal background EEG waveforms. Google "EEG spike detection" to find more on this technique.

good luck!

Steve

Re: EEG processing

viginesh — Tue, 10 Mar 2009 17:11:39 GMT

Hello Sir,

i searched in google as u said. Some papers were from IEEE. i could not download it. I need to see some blocks that has been done using labVIEW sir.. kindly help me with something that has been done using EEG

Re: EEG processing

Steve.J — Tue, 10 Mar 2009 18:14:24 GMT

I'm sorry - I don't have access to LV code today...the work I did with EEG was some years ago.

Try googling again and add "LabVIEW" to your search and see if you can find some examples. Also research the signal processing that is being done regardless of the programming language - the same principles will apply and anything that is done using Matlab, C, or other tools can be done using LV (and probably easier and faster).

Re: EEG processing

viginesh — Wed, 11 Mar 2009 02:29:45 GMT

Thank you sir.

Re: EEG processing

viginesh — Thu, 12 Mar 2009 17:12:55 GMT

I need to find the frequency of EEG signal for each second.

Ex. If it is a 10 sec signal, i need to get 10 frequencies. How can we find this. Is there any block regarding this.

Re: EEG processing

Steve.J — Thu, 12 Mar 2009 18:47:04 GMT

You can find many examples of power spectrum analysis in the examples that ship with LabVIEW. You can easily send a one second segment of EEG data to a standard LV power spectrum VI in a loop and the VI will return an array of power vs. frequency, plus a peak power at a certain frequency. Look for examples using FFT, spectral analysis, and/or frequency analysis in the examples.

Re: EEG processing

viginesh — Fri, 13 Mar 2009 04:59:08 GMT

HI sir, I am taking the data through "Read from measurement file" block. and the signal is for 10sce. How to implement loop here to give input for each sec.

Re: EEG processing

Steve.J — Fri, 13 Mar 2009 16:19:19 GMT

This is basic labview programming - you can use the index array VI to strip out a segment of the 10sec data array and do this in a loop, each time updating the index into the array. See examples on array functions.

Re: EEG processing

viginesh — Fri, 13 Mar 2009 16:23:00 GMT

Am new to labview and EEG sir. Thats the problem. Thank you

Re: EEG processing

Ray.R — Mon, 16 Mar 2009 20:43:48 GMT

... continued from here...

So you are looking for an algorithm to process acquired EEG signals for neurological disorders.

I doubt that you'll find someone who can post their vi for this. Or one that is tailored for you. You'll need to be more specific.

Which neurological disorder are you interested in? What are characteristics of EEG for that/those type(s) of disorder(s)?

If you provide examples, then we could provide assistance so that you can code the VI that you need.

Re: EEG processing

viginesh — Tue, 17 Mar 2009 06:30:01 GMT

Thank u Ray..

I need the alg for Epilepsy.. And also for artifact removal...

Re: EEG processing

viginesh — Fri, 20 Mar 2009 05:18:03 GMT

Hi,

I need to detect whether the signal pattern exists in any time period of another signal. I am using cross correlation. do not know how to analyse the pattern matching with the correlation coefficients.

Re: EEG processing

Ray.R — Mon, 23 Mar 2009 00:27:59 GMT

Is the signal pattern of interest documented somewhere?

Re: EEG processing

kannajin — Mon, 23 Mar 2009 07:11:58 GMT

hi..sir!

i'm doing a brainwave analysis project also, i have an question here

can i use LV program to read data from the RS232?

i'm using a ADC n microController...

Re: EEG processing

Ray.R — Mon, 23 Mar 2009 12:33:21 GMT

Hi kannajin,

Yes you can use LabVIEW to read data from RS232. You should start your own thread for that discussion.

Until then, here are a few pointers:

First establish communication between the PC & the microController using whatever application you normally use, such as HyperTerminal, ProComm, etc.

That is to verify that you can communicate with the target and also to determine the configuration settings.

Once that works, you know that your "hardware" setup (serial cable, PC, microCtrlr) is okay.

Open LabVIEW, and open a new VI. The new VI is so that you can go into the Help menu. From there, select "Find Examples".

Click on the search tab and type "serial" in the Enter Keywords box. Below the box, the word serial will appear in the Double Click Keyword box.

Double click it.

Have a look at the top 3 examples (Advanced & Basic Serial Read & Write). That should get you started.

Please start a new thread to continue the dicussion if you have any other questions.

Re: EEG processing

kannajin — Mon, 23 Mar 2009 18:28:00 GMT

thanks lot for ur information~~~this is the best new i got for today!!

really thanks lot .......i try to use this !!

again thankk you so much!!

if there is any further problem..i hope stil can get solution for all of u!!

thanks again

best regard

jin

Re: EEG processing

viginesh — Sat, 28 Mar 2009 16:16:44 GMT

I need all the frequency contents of the signal as numeric value. I can find it using spectrum. But need it in numerical format.. kindly help me out of this