A Structure Design Method for Reduction of MRI Acoustic Noise

Table 1

Mechanical properties of the acoustic model components.

Item	(GPa)		(kg/m^3)	(m/s)
Gradient assembly	20	0.30	3000
Gradient coils	117	0.34	8960
Bolts between the gradient assembly and main magnet	210	0.3	7800
Main magnet	210	0.3	7800
Horn structure	40	0.3	2550
Surrounding air			1.225	340

, and are Young’s modulus, Poisson’s ratio, density, and sound velocity, respectively. Since and coils were not simulated in the 2D model, Yong’s modulus and density of the gradient assembly were set to be a little larger compared with our previous 3D model. The main magnet was simulated as two steel cylinders in the 2D model.