A. Trequattrini

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The homogeneity of the magnetic field plays a fundamental role in MRI. Standard shimming techniques of the magnetic field are usually applied on volumes such as spheres or (less frequently) on surfaces of revolution (oblate and prolate spheroids) and are based on well-known solutions of the Laplace equation. We present a complete mathematical formalism for(More)
The need to optimize the magnet shape, size and region of homogeneity with respect to the anatomy of the patient is particularly strong in dedicated MRI magnet design: cost and weight are often determining factors for success in the market. An elongated coil geometry could be useful in cases where the scanner is designed for imaging non axisymmetric parts(More)
So far, one of the major obstacles to the development of special purpose MRI imaging apparatus has been the lack of a magnetic technology that could cater to the need for a light, compact and efficient magnet, capable of providing the required field uniformity at a reasonable cost. Today, recent advances in magnet design permit attaining, with the use(More)
The key factor for the success of dedicated magnetic resonance imaging systems on the medical imaging market is the optimization of the magnet geometry with respect to the anatomical region that has to be scanned. This leads to the design of compact magnetic structures which do not need the whole body of the patient to be inserted inside the cavity. A(More)
A new 0.2 T magnetic structure for dedicated (extremities) Magnetic Resonance Imaging is presented. The main features are: magnetic circuit based on rare-earth permanent magnet material and iron, ergonomic double-height cavity shape (optimized to allow shoulder, legs and joints examinations in a very compact magnet with respect to traditional whole body(More)
A novel 0.25 T permanent magnet device for dedicated Magnetic Resonance Imaging is presented. The main feature is that the magnetic system is connected to a support enabling the rotation of the entire structure to perform patient examination under different weight bearing conditions. The rotation allows to study particularly hidden (in standard horizontal(More)
A fast and reliable 2D optimization method is presented for the shaping of the pole plates of an open MRI magnet. The pole plates shape is determined by expanding the profile in Fourier series: different optimization methods have been analysed, starting from the initial magnetic field homogeneity with flat pole pieces and some results are given. The(More)
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