Patent ID: 7030610
Filing Date: 2006-04-18
Classification: G01R,Y10T

Abstract:
1. An acoustically quiet MRI coil design including a magnetic coil system comprising: an outer coil loop carrying a first current and an inner coil loop carrying a second current, wherein: a first portion of the outer coil loop and a first portion of the inner coil loop are embedded in, or fixed to, a first block of first material of generally rectangular or arcuate shape with predetermined acoustic characteristics; a second portion of the outer coil loop and a second portion of the inner coil loop are embedded in, or fixed to, a second block of said first material generally of rectangular or arcuate shape; said first and second blocks of material are separated by connecting flexible joints, said outer and inner coil loops comprise generally rectangular or arcuate paths, the second portion of said inner coil loop being positioned in order to create a first force when energized with said second current which counteracts or assists a second force generated by said first portion of said outer coil when energized with said first current, said forces being transmitted by columns, struts or ties rigidly connecting said second portion of said inner coil loop to said first portion of said outer coil loop; the first portion of said inner coil loop being positioned in order to create a third force when energized with said second current which counteracts or assists a fourth force generated by said second portion of said outer coil when energized with said first current, said forces being transmitted by columns, struts or ties rigidly connecting said first portion of said inner coil loop to said second portion of said outer coil loop, and the first and second portions of the inner and outer coil loops being formed substantially rigid.