摘要:
The invention relates to a method for the computer-aided design of a device for deflecting the trajectory of waves by diffraction around columns, said method comprising: a) computer acquisition (202) of a division of the deflection zone, dividing same into multiple adjacent regions, with multiple vertical columns distributed inside each region; b) for each region, computer acquisition (204) of a transform product [c p c g ], wherein c p is the phase speed of the waves and c g is the group speed of the waves inside the region, said transform product [c p c g ] being a two-dimensional square array; c) computer acquisition (202) of the depth of each region; and, for each region, d) computer calculation (206) of the dimensions of the cross-section of the columns in this region on the basis of the transform product [c p c g ] acquired for this region and of the depth in this region.for each region,
摘要:
The invention relates to a material for use as a dielectric pad in high field and/or very high field magnetic resonance imaging instrument, comprising at least one polar solvent having a melting point of 14°C to 50°C, a dispersant and a dielectric charge. The invention relates also to a pad used in field of high field and/or very high field magnetic resonance imaging made of at least such a material.