A. Trebeschi

Publications of A. Trebeschi

• Argos 500: operation of a helmet vector-MEG.

  Authors: A Pasquarelli, R. Rossi, M De Melis, L Marzetti, A. Trebeschi, H P Müller, S N Erné

  Neurology & clinical neurophysiology : NCN. 02/2004; 2004:97.

  We here describe the MEG system recently installed at the University of Ulm; it is specifically designed for clinical application and routine use, to allow investigation of a large number of patientsWe here describe the MEG system recently installed at the University of Ulm; it is specifically designed for clinical application and routine use, to allow investigation of a large number of patients per day. To reach this goal, the system design meets the requirements of reliability, high field sensitivity, minimal set-up time before each measurement and an easy-to-handle user interface. The sensor system consists of a 163 vector-magnetometers array oriented and located in a suitable way to cover the whole head of the patient. Four additional triplets are available as references to arrange software gradiometers. The helmet shaped sensor system is positioned to accommodate the patient in a supine position. Simultaneously to the MEG, there are 64 EEG channels. Other relevant patient information can be recorded up to a total number of 660 acquisition channels. Noise level of a single magnetometer is about 5 fT/square root of Hz. Maximum sampling rate is 4200 Hz.

• MSR upgrade for clinical MEG

  Authors: A Pasquarelli, S. N. Ern, A. Trebeschi

  12/2001;

  Introduction To accommodate the new Argos 500 MEG instrument [1] a general upgrade of the existing 2+1layer magnetically shielded room at the neurological department was necessary. Due to theIntroduction To accommodate the new Argos 500 MEG instrument [1] a general upgrade of the existing 2+1layer magnetically shielded room at the neurological department was necessary. Due to the innovative technology and the ambitious goal more stringent requirements where set for shielding performances and shielding anisotropy. The upgrade process of the existing MSR was carried out in cooperation with Advanced Technologies Biomagnetics and consisted in: 1. Adding a third layer of soft magnetic material. 2. Redesigning the structure supporting the magnetic layers of the door to improve the matching with the walls to reduce the door effects. 3. Redesigning completely the operation of the door by removing all hidden mechanisms and leverages and replacing them with external pneumatic locks. 4. Adding extra features like automatic emergency release of the door in case of power and or airpressure failure and manual locks disengage in case of mechanical failure. 2 Methods The Magnetic