The collocation method combined with a serial expansion of the electric potential is presented as an alternative way of solving the boundary integral equations of electroencephalography and magnetoencephalography.

A magnetically shielded room (MSR) equipped with an automatic door is designed and developed to improve a convenience of operation. The MSR for biomagnetic measurements (e.g., magneto-encephalography), it required that such has high shielding performance because biomagnetism extremely smaller than environmental magnetic noises. In particular, we devise the laminar structure shield plates preven...

Payers are increasingly using episodes of care to measure and reward efficiency in health care. Much attention has been paid to the effects of different rules for assigning episodes to providers, but little to how individual costs are assigned to episodes. In this paper, we studied the extent to which the two most widely-used commercially available episode groupers differ in the episodes they c...

C. Del Gratta, S. Della Penna, A. Ferretti, R. Franciotti, V. Pizzella, K. Torquati, A. Tartaro, L. Bonomo, G.L. Romani, and P.M. Rossini Department of Clinical Sciences and Biomedical Imaging, and Institute of Advanced Biomedical Technologies, University of Chieti, Italy; INFM, UdR L’Aquila, Italy; IRCCS “Centro S. Giovanni di Dio” – FBF, Brescia, Italy; AFaR – CRCCS “Isola Tiberina”, Rome, Italy

Two main results are included in this paper. The first one deals with the leading asymptotic term of the magnetic field outside any conductive medium. In accord with physical reality, it is proved mathematically that the leading approximation is a quadrupole term which means that the conductive brain tissue weakens the intensity of the magnetic field outside the head. The second one concerns th...

Here the high timing resolution positron detector designed to be used in the MEG experiment is described. Several technical challenges have been faced to obtain the unprecedented goal resolution of 100 ps FWHM for positrons to be detected in the MEG experiment. Also an overview on past experiments is proposed. The key role of the MEG experiment in unveiling New Physics phenomena is briefly stre...

We present the four key areas of research-preprocessing, the volume conductor, the forward problem, and the inverse problem-that affect the performance of EEG and MEG source imaging. In each key area we identify prominent approaches and methodologies that have open issues warranting further investigation within the community, challenges associated with certain techniques, and algorithms necessi...

We present a new method to localize language-specific cortex in MEG event-related studies. We produce cortically constrained dynamic images of brain activity using regularized min-norm imaging. Then, we use a permutation test to optimally threshold the cortical maps while controlling false positive ratio. Once we establish significant activation, we perform a language asymmetry test based on av...

Here we show how it is possible to make estimates of brain structure based on MEG data. We do this by reconstructing functional estimates onto distorted cortical manifolds parameterised in terms of their spherical harmonics. We demonstrate that both empirical and simulated MEG data give rise to consistent and plausible anatomical estimates. Importantly, the estimation of structure from MEG data...