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MRI Gradient Artifact Removal for ECG and EMG

New Methodology Removes Artifact      fMRI, MRI, Magnetic Resonance Imaging

The new techniques allow researchers to record physiological data from a subject in the MRI. The brain is scanned while the subject receives a combination of visual, auditory, somatosensory, and electrical stimulation. The stimulation activates different regions of the brain and allows researchers to image the brain while the brain responds to the stimuli. The physiological data, stimulation and MRI images are all highly synchronized. This allows researchers to compare physiological responses and images to precise stimuli.

BIOPAC has a range of MRI products to record almost every physiological signal from inside the scanner. A range of isolated and filtered MRI cables provide the conduit between the subject in the scanner and the MP150/MP100 data acquisition systems and amplifiers that are located in the control room. BIOPAC MRI-compatible electrodes and MRI-compatible transducers connect to the filter cables and the subject.

AcqKnowledge® software (included with the MP150 system) allows researchers to identify the frequency of the gradient noise and then remove it from the signal. The gradient artifact can be removed in real-time and during post-acquisition processing.

Alan Macy, Head of Research Development at BIOPAC, is responsible for the development of the new techniques. Macy said, “There will be a big improvement in the quality of the signals and data collected from inside the scanner as BIOPAC continues to invest in MRI research. We are constantly learning about the problems associated with recording physiological data in the MRI and developing new tools for improving signal quality.”

BIOPAC has published two Application Notes that help researchers to use the new techniques and improve the quality of their data. These Application Notes are part of a series that assist researchers in collecting high quality data from inside the MRI.

For more information, review MRI – Human and Animal Studies. To receive a copy of the new MRI Application Notes, contact info@biopac.com.
 

Released 02.10.2009

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Basic principles of physiological data collection covers fundamentals of data collection and equipment configuration equipment to help you refine experiment protocols and avoid costly missteps. Frazer Findlay, CEO of BIOPAC, discusses common mistakes with physiology recording and shares his secrets for collecting great data. Topics include: How to prep a subject and where to place electrodes; Which type of electrodes work for different body signals; Analog to Digital Conversion; Sample rates (correct vs. incorrect); Filtering; and Scaling and calibration.
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