J. M. Carlson, Cook Incorporated, Bloomington, IN; E. Smith, Deringer Ney, Bloofield, CT
Straight wire sections and simple coils of three novel palladium based alloys, Paliney 500, 1100 and 1200, were imaged at a parallel, perpendicular and orthogonal orientation to a magnetic field created by a standard 3.0 tesla MRI. A gradient echo imaging sequence with varying imaging parameters was used to ascertain the artifact size produced by the straight wires and simple coils, angular deflection and any temperature rise caused by potential RF heating effects. The novel palladium alloys were compared to Pt - 10%Ir, Pt - 20%Ir, Pt - 10.5%Ni, Pt - 8%W, MP35N, Elgiloy, Ni - Cr alloy 625, 304V stainless steel and superelastic nitinol. Various imaging scans, angular deflection and temperature rise data will be presented in order to ascertain the improvement in artifact size and resistance to temperature rise when using these novel palladium based alloys in a standard 3.0 Tesla MRI unit as compared to currently used medical grade alloys. It was found that the three palladium based alloys exhibited a minimal temperature rise and angular deflection. The Paliney 1100 and 1200 had equivalent to or smaller artifact size as compared to commercially available platinum based alloys. The magnetic susceptibility of the various wires was also be measured in order to determine whether or not there is a correlation with artifact size.
Summary: Straight sections and simple coils of three novel palladium based alloys, Paliney 500,1100 and 1200, were imaged at a parallel, perpendicular and orthogonal orientation to a standard magnetic field created by a 3.0 Tesla MRI. A gradient echo imaging sequence with varying imaging parameters was used to determine artifact size, angular deflection and temperature rise in order to ascertain the improvement in artifact size and resistance to temperature rise when using these novel palladium alloys in a standard 3.0 Tesla MRI unit as compared to currently used medical grade alloys. The novel palladium alloys were compared to Pt - 10%Ir, Pt - 20%Ir, Pt - 10.5%Ni,Pt - 8%W, MP35N, Elgiloy, Ni - Cr alloy 625, 304V stainless steel and superelastic nitinol. It was found that the Paliney 1100 and 1200 alloys had equivalent to or smaller artifact size as compared to the current commercially available platinum based alloys. The magnetic susceptibility of the various wires was also measured in order to determine whether or not there is a correlation with artifact size.