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Technologies>

QEEG Brain Mapping> QEEG vs mini-QEEG

Difference between QEEG and mini-QEEG


Many clients are confused by centers that claim to offer QEEG, but are actually doing a mini-QEEG. There is a whole of difference between the two.


QEEG (Quantitative Electroencephalogram) or Brain Mapping is a procedure that measures and records neural activities of neurons or brain cells in the brain simultaneously from at least 19 locations. It is important that the activities are measured simultaneously or at the same time, so that we can understand how the brain works as a whole. Studies showed that a minimum of 19 locations is required to map our brain function. More is better but any thing less than 19 locations will not provide sufficient resolution.


The manufacturer of the mini-Q informs that:


A MINI-Q is a type of EEG switch device that allows a 2 or 4 channel EEG to take multiple channel recordings in sequence. When used with the accompanying assist software, it becomes possible to do fast whole-head assessments without the cost of a full head EEG.


A MINI-Q is intended to complement, not replace, a full QEEG. It is much like a chest x-ray, when compared to a CAT scan. A chest x-ray is much faster and cheaper than a CAT scan, and serves its particular purposes. Just as everyone does not need a CAT scan, everyone does not need a full QEEG, and can benefit from a MINI-Q as an alternative.


Sequential measurement:


It is important to note that the mini-Q measures only 2 to 4 sites on the head at a time, while a full QEEG measures at least 19 sites on the head simultaneously. So for a mini-Q to measure 19 sites, it has to be repeated 5 times in sequence if a 4 channel measurement device is used. It would have to be repeated 10 times if a 2 channel measurement device is used.


The problem with such sequential measurement is that while you are recording 4 sites, you do not know what is happening at the other 15 or more sites. This can give a very misleading picture of what’s going on in the brain.


In a full QEEG, at least 19 sites on the head are measured and recorded simultaneously. This simultaneous measurement is crucial as it allows us to have a good idea on how we use our brain and what goes on when we are engaged on a task. For example: If one location of the brain shows excessive neural activities while on task, we can assess if the other 18 or more sites are affected by this excessive activities. This cannot be done with the mini-Q.


Length of measurement:


For some reason, the mini-Q measures EEG data only for 1 minute (60 sec). This amount of data is too little to do a rigorous statistical analysis. This is because the recording will usually contain noise, interferences or signals which are not EEG or brain waves, such as eye blinks or movements. These non-EEG signals must be removed before any analysis can be done to assess brain function. Having these contaminants will distort the analysis and lead to a wrong conclusion. So with 60 seconds of raw data, the amount of left data after removal of the contaminants can be insufficient for a good analysis. This can result in arriving at a wrong conclusion.


In all research and clinical work, at least 3 minutes (180 sec) of data is the norm. At Spectrum Learning, we sometimes do longer than 3 minutes of data recording to ensure that we have sufficient data to do a rigorous analysis. This is especially so if the child is restless and unable to keep still.


For more information on QEEG and mini-QEEG, please feel free to contact us either by email or a phone call.


We provide training support in this region for MITSAR, a medical grade QEEG equipment.

Brain Mapping - QEEG


Brain Mapping (QEEG) is a safe and non-invasive brain imaging technique. It measures brain waves (EEG) that the brain sends out from at least 19 locations simultaneously.


Careful analysis of these brains waves (EEG) can reveal information on how one is using his/her brain. It can also tell us the maturity of different parts of the brain. It is often used to investigate if there are any hidden seizures.


Read more …

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