Name
Title | ||
|---|---|---|
An inverse methodology for high-frequency RF coil design for MRI with de-emphasized B/sub 1/ fields |
Abstract | ||
|---|---|---|
An inverse methodology for the design of biologically loaded radio-frequency (RF) coils for magnetic resonance imaging applications is described. Free space time-harmonic electromagnetic Green's functions and de-emphasized B 1 target fields are used to calculate the current density on the coil cylinder. In theory, with the B 1 field de-emphasized in the middle of the RF transverse plane, the calculated current distribution can generate an internal magnetic field that can reduce the central overemphasis effect caused by field/tissue interactions at high frequencies. The current distribution of a head coil operating at 4 T (170 MHz) is calculated using an inverse methodology with de-emphasized B 1 target fields. An in-house finite-difference time-domain routine is employed to evaluate B 1 field and signal intensity inside a homogenous cylindrical phantom and then a complete human head model. A comparison with a conventional RF birdcage coil is carried out and demonstrates that this method can help in decreasing the normal bright region caused by field/tissue interactions in head images at 170 MHz and higher field strengths. |
Year | DOI | Venue |
|---|---|---|
2005 | 10.1109/TBME.2005.851514 | IEEE Transactions on Biomedical Engineering |
Keywords | Field | DocType |
complete human head model,170 mhz,in-house finite-difference time-domain routine,coils,green's function,human model,homogenous cylindrical phantom,high-frequency radio-frequency coil design,rf birdcage coil,free space time-harmonic electromagnetic green functions,rf coil,internal magnetic field,fdtd,green's function methods,magnetic resonance imaging,inverse methodology,biomedical mri,mri,field/tissue interactions,de-emphasized radio-frequency fields,biomagnetism,pre-emphasis,finite difference time-domain analysis,biological tissues,phantoms,4 t,finite difference time domain,green s function,magnetic resonance image,pre emphasis,current density,power,radio frequency,pulse,magnetic field,space time,high frequency | Current density,Magnetic field,Transverse plane,Computer science,Biomagnetism,Electronic engineering,Electromagnetic coil,Finite-difference time-domain method,Radiofrequency coil,Human head | Journal |
Volume | Issue | ISSN |
52 | 9 | 0018-9294 |
Citations | PageRank | References |
1 | 0.48 | 3 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Bin Xu | 1 | 1 | 1.16 |
| Qing Wei | 2 | 29 | 3.27 |
| Feng Liu | 3 | 13 | 4.75 |
| S. Crozier | 4 | 172 | 27.32 |