Yu-Chung N Cheng et al 2009 Phys. Med. Biol. 54 7025 doi:10.1088/0031-9155/54/22/018
Yu-Chung N Cheng1,4, Ching-Yi Hsieh2, Jaladhar Neelavalli3 and E Mark Haacke1
Show affiliationsA new procedure for accurately measuring effective magnetic moments of long cylinders is presented. Partial volume, dephasing and phase aliasing effects are naturally included and overcome in our approach. Images from a typical gradient echo sequence at one single echo time are usually sufficient to quantify the effective magnetic moment of a cylindrical-like object. Only pixels in the neighborhood of the object are needed. Our approach can accurately quantify the magnetic moments and distinguish subpixel changes of cross sections between cylindrical objects. Uncertainties of our procedure are studied through the error propagation method. Images acquired with different parameters are used to test the robustness of our method. Alternate approaches and their limitations to extract magnet moments of objects with different orientations are also discussed. Our method has the potential to be applied to any long object whose cross section is close to a disk.
Issue 22 (21 November 2009)
Received 3 July 2009, in final form 9 October 2009
Published 4 November 2009
Yu-Chung N Cheng et al 2009 Phys. Med. Biol. 54 7025
H Alnes et al 2007 J. Phys. A: Math. Theor. 40 F315
Massimo Tinto and Shane L Larson 2005 Class. Quantum Grav. 22 S531
D Mendoza et al 1999 J. Phys.: Condens. Matter 11 L317
A N F Aleixo and A B Balantekin 2004 J. Phys. A: Math. Gen. 37 8513
R A Lippert et al 2006 J. Phys.: Condens. Matter 18 4295
Matthias Vojta 2003 Rep. Prog. Phys. 66 2069
I Shlimak et al 2001 J. Phys.: Condens. Matter 13 6059
H W J Blote et al 1995 J. Phys. A: Math. Gen. 28 6289
Eduardo G Vergini 2004 J. Phys. A: Math. Gen. 37 6507