Science Current Events | Science News |

Unprecedented accuracy in locating brain electrical activity with new device

July 27, 2012

Researchers at Aalto University in Finland have developed the world's first device designed for mapping the human brain that combines whole-head magnetoencephalography (MEG) and magnetic resonance imaging (MRI) technology. MEG measures the electrical function and MRI visualizes the structure of the brain. The merging of these two technologies will produce unprecedented accuracy in locating brain electrical activity non-invasively.

We expect that the new technology will improve the accuracy of brain mapping of patients with epilepsy. It may also improve the diagnosis of cancer patients because the improved image contrast may facilitate the characterization of cancer tissue, says Academy Professor Risto Ilmoniemi.

The innovative MEG-MRI device will allow brain imaging for new patients, such as those with metal implants. Also, the silent and open device will not scare children or make people feel claustrophobic. In the future, this development can also reduce costs as images can be obtained in one session rather than two, Ilmoniemi states.

The problem with MEG is that when the technique is used separately, the image accuracy can be compromised because of the movement of the brain. Also, the image it provides may not be accurate enough for precise brain surgery. In the past, it was not possible to combine high-field MRI and MEG because their magnetic fields interfered with one another. Extremely sensitive magnetic field sensors have now been developed, so scientists can now use the new low-field MRI with a magnetic field strength of only a few hundred-thousandths of that of the high-field MRI device. Fusing these two technologies produces localization accuracy that was not possible with MRI or MEG alone.

Aalto University

Related Magnetoencephalography Current Events and Magnetoencephalography News Articles

Bilingual baby brains show increased activity in executive function regions
Many brain studies show that bilingual adults have more activity in areas associated with executive function, a set of mental abilities that includes problem-solving, shifting attention and other desirable cognitive traits.

LSD changes consciousness by reorganizing human brain networks
LSD is known to cause changes in consciousness, including "ego-dissolution", or a loss of the sense of self.

Analysis of neuronal avalanches reveals spatial temporal roadmap of humans higher cognitive function
The word 'avalanche' is generally associated with violent and unexpected events -- such as rockslides, or the sudden collapse of unstable drifts of snow. But in brain research, avalanches -- intermittent cascades of electrical activity -- are everyday occurrences that are not only peaceful, but actually reflect stability.

A 'hot' new development for ultracold magnetic sensors
Magnetoencephalography, or MEG, is a non-invasive technique for investigating human brain activity for surgical planning or research, and has been used in hospitals and universities for more than 30 years.

VTT develops a simple but extremely sensitive magnetometer
VTT Technical Research Centre of Finland has developed an innovative magnetometer that can replace conventional technology in applications such as neuroimaging, mineral exploration and molecular diagnostics.

Study uncovers why almost winning is just as good for some gamblers
A new study led by the University of Exeter and Swansea University has pinpointed the changes in the brain that lead gamblers to react in the same way to near-misses as they do to winning.

Study Shows Autistic Brains Create More Information at Rest
New research from Case Western Reserve University and University of Toronto neuroscientists finds that the brains of autistic children generate more information at rest - a 42% increase on average.

Expanding our view of vision
Every time you open your eyes, visual information flows into your brain, which interprets what you're seeing.

In the blink of an eye
Imagine seeing a dozen pictures flash by in a fraction of a second. You might think it would be impossible to identify any images you see for such a short time.

NIST calibration tools to encourage use of novel medical imaging technique
The National Institute of Standards and Technology (NIST) has developed prototype calibration tools for an experimental medical imaging technique that offers new advantages in diagnosing and monitoring of certain cancers and possibly other medical conditions.
More Magnetoencephalography Current Events and Magnetoencephalography News Articles

Clinical Magnetoencephalography and Magnetic Source Imaging

Clinical Magnetoencephalography and Magnetic Source Imaging
by Andrew C. Papanicolaou (Author)

This is the first volume to explore the field of clinical magnetoencephalography (MEG) and magnetic source imaging (MSI), the techniques measuring the magnetic fields generated by neuronal activity in the brain. Describing the empirical knowledge gained during the last two decades, this book will serve as a basis for the training of clinicians and scientists entering this new and exciting field. The book covers the methods for recording MEG and performing MSI in a clinical setting and includes practical examples of data collection and analysis. It explains why MEG should be used in the evaluation and treatment of patients being considered for epilepsy surgery, concluding with a section describing the potential for future applications of these methods. This is essential reading for...

Magnetoencephalography: From Signals to Dynamic Cortical Networks (Series in Bioengineering)

Magnetoencephalography: From Signals to Dynamic Cortical Networks (Series in Bioengineering)
by Selma Supek (Editor), Cheryl J. Aine (Editor)

Magnetoencephalography (MEG) is an invaluable functional brain imaging technique that provides direct, real-time monitoring of neuronal activity necessary for gaining insight into dynamic cortical networks. Our intentions with this book are to cover the richness and transdisciplinary nature of the MEG field, make it more accessible to newcomers and experienced researchers and to stimulate growth in the MEG area. The book presents a comprehensive overview of MEG basics and the latest developments in methodological, empirical and clinical research, directed toward master and doctoral students, as well as researchers. There are three levels of contributions: 1) tutorials on instrumentation, measurements, modeling, and experimental design; 2) topical reviews providing extensive coverage of...

MEG-EEG Primer

MEG-EEG Primer
by Riitta Hari (Author), Aina Puce (Author)

Magnetoencephalography (MEG) and electroencephalography (EEG) provide complementary views to the neurodynamics of healthy and diseased human brains. Both methods are totally noninvasive and can track with millisecond temporal resolution spontaneous brain activity, evoked responses to various sensory stimuli, as well as signals associated with the performance of motor, cognitive and affective tasks.

MEG records the magnetic fields, and EEG the potentials associated with the same neuronal currents, which however are differentially weighted due to the physical and physiological differences between the methods. MEG is rather selective to activity in the walls of cortical folds, whereas EEG senses currents from the cortex (and brain) more widely, making it harder to pinpoint the...

Clinical Applications of Magnetoencephalography

Clinical Applications of Magnetoencephalography
by Shozo Tobimatsu (Editor), Ryusuke Kakigi (Editor)

This book presents an overview of the recent advances in clinical applications of magnetoencephalography (MEG). With the expansion of MEG to neuroscience, its clinical applications have also been actively pursued. Featuring contributions from prominent experts in the fields, the book focuses on the current status of the application of MEG, not only to each nervous system but also to various diseases such as epilepsy, neurological disorders, and psychiatric disorders, while also examining the feasibility of using MEG for these diseases. Clinical Applications of Magnetoencephalography offers an indispensable resource for neurologists, neurosurgeons, pediatricians, and psychiatrists, as well as researchers in the field of neuroscience.  

MEG: An Introduction to Methods

MEG: An Introduction to Methods
by Peter Hansen (Editor), Morten Kringelbach (Editor), Riitta Salmelin (Editor)

Magnetoencephalography (MEG) is an exciting brain imaging technology that allows real-time tracking of neural activity, making it an invaluable tool for advancing our understanding of brain function. In this comprehensive introduction to MEG, Peter Hansen, Morten Kringelbach, and Riitta Salmelin have brought together the leading researchers to provide the basic tools for planning and executing MEG experiments, as well as analyzing and interpreting the resulting data. Chapters on the basics describe the fundamentals of MEG and its instrumentation, and provide guidelines for designing experiments and performing successful measurements. Chapters on data analysis present it in detail, from general concepts and assumptions to analysis of evoked responses and oscillatory background activity....

High-Tc SQUIDs for Biomedical Applications: Immunoassays, Magnetoencephalography, and Ultra-Low Field Magnetic Resonance Imaging (Springer Theses)

High-Tc SQUIDs for Biomedical Applications: Immunoassays, Magnetoencephalography, and Ultra-Low Field Magnetic Resonance Imaging (Springer Theses)
by Fredrik Öisjöen (Author)

This thesis describes the challenging task of developing high critical temperature superconducting quantum interference devices (high-Tc SQUIDs) and using them as sensors for biomedical applications, including magnetic immunoassays, magnetoencephalography and magnetic resonance imaging (MRI). The first part of this work discusses the development of fast magnetic immunoassays, which can be used to improve the sensitivity, or to create new, unique point-of-care diagnostics systems. The second part shows that high-Tc SQUIDs might make magnetoencephalography more available, thus opening the field of high-Tc SQUID-based magnetoencephalography for recording brain functions. This technique can be combined with ultra-low field MRI which is discussed in the last part. This combination may provide...

Clinical Magnetoencephalography and Magnetic Source Imaging 1st Edition by Papanicolaou, Andrew C. (2009) Hardcover

Clinical Magnetoencephalography and Magnetic Source Imaging 1st Edition by Papanicolaou, Andrew C. (2009) Hardcover
by Cambridge University Press (Publisher)

Magnetoencephalography: From Signals to Dynamic Cortical Networks (Series in Bioengineering) (2014-08-08)

Magnetoencephalography: From Signals to Dynamic Cortical Networks (Series in Bioengineering) (2014-08-08)
by unknown (Author)

Brain Signal Analysis: Advances in Neuroelectric and Neuromagnetic Methods (MIT Press)

Brain Signal Analysis: Advances in Neuroelectric and Neuromagnetic Methods (MIT Press)
by Todd C. Handy (Editor)

Cognitive electrophysiology concerns the study of the brain's electrical and magnetic responses to both external and internal events. These can be measured using electroencephalograms (EEGs) or magnetoencephalograms (MEGs). With the advent of functional magnetic resonance imaging (fMRI), another method of tracking brain signals, the tools and techniques of ERP, EEG and MEG data acquisition and analysis have been developing at a similarly rapid pace, and this book offers an overview of key recent advances in cognitive electrophysiology. The chapters highlight the increasing overlap in EEG and MEG analytic techniques, describing several methods applicable to both; they discuss recent developments, including reverse correlation methods in visual-evoked potentials and a new approach to...

Adaptive Processing of Brain Signals

Adaptive Processing of Brain Signals
by Saeid Sanei (Author)

In this book, the field of adaptive learning and processing is extended to arguably one of its most important contexts which is the understanding and analysis of brain signals. No attempt is made to comment on physiological aspects of brain activity; instead, signal processing methods are developed and used to assist clinical findings. Recent developments in detection, estimation and separation of diagnostic cues from different modality neuroimaging systems are discussed. These include constrained nonlinear signal processing techniques which incorporate sparsity, nonstationarity, multimodal data, and multiway techniques. Key features: Covers advanced and adaptive signal processing techniques for the processing of electroencephalography (EEG) and magneto-encephalography (MEG) signals, and...

© 2017