danshel
commented
8 years ago Hi Arielle
Your link to the "syncbox" info isn't working.
On Mon, Jan 25, 2016 at 1:34 PM, arielletambini notifications@github.com wrote:
Hi @BenInglis https://github.com/BenInglis and all,
I'm returning to getting the EEG-fMRI setup going One question: we are trying to set up a piece of hardware (a 'syncbox', http://wwwbrainproductscom/productdetailsphp?id=19 ) which takes in as input the scanner master clock output to synchronize the EEG acquisition relative to the scanner clock Some more info from the brainvision people (the EEG system that we have) about this is below [I previously thought that this was the TTL, but apparently not] Would it be possible to have this signal funneled into the control room via a coax cable (that is what the box takes in as input) - or perhaps this already exists?
from Brainvision people: "The “scanner master clock” output is usually in a machine room where the MRI hardware and cold head pump are located Within the many cabinets in that room, there is a master clock output there which operates in the megahertz range This is the clock against which the MRI decides when different steps should be taken for acquiring the MR images
This is separate from the 5V TTL signal that you mentioned which throws at the start of every TR Both signals are important to EEG/fMRI scans for different reasons
The SyncBox connecting the scanner master clock to the BUA is important for synchronizing the EEG clock with the scanner clock to prevent any phase shifting in the scanner artifacts that are recorded By continuously keeping the clocks in sync, the MR gradient artifact is kept very stable improving a researchers ability to cleanly remove the artifact from the signal of interest"
Thanks! Arielle
— Reply to this email directly or view it on GitHub https://github.com/Brain-Imaging-Center/EEG-fMRI/issues/3.
arielletambini
BenInglis
RickRedfern
Hi @BenInglis and all,
I'm returning to getting the EEG-fMRI setup going. One question: we are trying to set up a piece of hardware (a 'syncbox', http://www.brainproducts.com/productdetails.php?id=19 ) which takes in as input the scanner master clock output to synchronize the EEG acquisition relative to the scanner clock. Some more info from the brainvision people (the EEG system that we have) about this is below. [I previously thought that this was the TTL, but apparently not...] Would it be possible to have this signal funneled into the control room via a coax cable (that is what the box takes in as input) - or perhaps this already exists?
from Brainvision people: "The “scanner master clock” output is usually in a machine room where the MRI hardware and cold head pump are located. Within the many cabinets in that room, there is a master clock output there which operates in the megahertz range. This is the clock against which the MRI decides when different steps should be taken for acquiring the MR images.
This is separate from the 5V TTL signal that you mentioned which throws at the start of every TR. Both signals are important to EEG/fMRI scans for different reasons.
The SyncBox connecting the scanner master clock to the BUA is important for synchronizing the EEG clock with the scanner clock to prevent any phase shifting in the scanner artifacts that are recorded. By continuously keeping the clocks in sync, the MR gradient artifact is kept very stable improving a researchers ability to cleanly remove the artifact from the signal of interest."
Thanks! Arielle