|Whole body MRI magnet with high field|
The technique of magnetic resonance imaging (MRI) is a diagnostic tool for research and neuroscience. Its evolution led to instruments for whole body operating at very high field from 0.5 to 1.5 tesla for medical examinations and 3 to 5 tesla for research instruments.
Neurospin project aims to develop a centre with 4 MRI systems:
o Clinic Research : MRI 3T and 7T (Siemens)
o Pre Clinic Research : MRI 17T, small aperture (Bruker)
o Clinic Research : MRI 11.75 T/900mm (ISEULT program)
o Pre Clinic Research : MRI 11.75T/1000mm (future project)
The last 2 MRI systems with high fields and large aperture do not exist on the market and are the subject of a R&D program with Siemens called Iseult.
In this context, the DAPNIA has been solicited for developing and manufacturing the superconducting magnets of 11.75T whole body.
CEA centre at Saclay.
Once built, the first magnet wil be integrated in the MRI system and installed in the Neurospin imaging centre at Saclay.
The main prototype investigations are described below and include:
At the same time, tests of these prototypes require the completion of specific cryogenic testing stations. The use of these stations will also provide an opportunity to assess and validate the developments made on cryogenics to 1.8 K, electrical power, command control and protection of the magnet.
The main specific features of this magnet lies in the following points:
Design and manufacture of a magnet producing a 11.75T field in a diameter of 900 mm with as main features :
Scientific and Technical Responsibilities
The Dapnia responsabilities are the following :
Project Manager : Pierre VÉDRINE
last update : 03-16 00:00:00-2010 (2305)
High field magnetic resonance imaging at field strengths at or above 7 tesla appears to be one of the most promising techniques for the early detection of neurological pathologies. Currently beyond the reach of most MRI system manufacturers, this imaging technology is beset with new technological difficulties. The CEA Iseult project team (IRFU and I2BM) has now overcome one of these problems; the homogeneous excitation of atomic nuclei using parallel transmission. This is needed in order to achieve a uniform excitation of the proton spins in living tissue, which in turn enables images of the human brain to be obtained without areas of shadow or loss of contrast. In vivo images recently ... More »
The 11.75 tonne whole body Iseult magnet to be installed in the Neurospin centre in 2012 will push back the boundaries of cerebral imaging. A key step in the success of this Franco-German project is the development of the SEHT test station in which a nominal field strength of 8 teslas was successfully achieved in early October 2008