Radiofrequency pulse design using nonlinear gradient magnetic fields
نویسندگان
چکیده
منابع مشابه
Wavelet Domain Radiofrequency Pulse Design Applied to Magnetic Resonance Imaging
A new method for designing radiofrequency (RF) pulses with numerical optimization in the wavelet domain is presented. Numerical optimization may yield solutions that might otherwise have not been discovered with analytic techniques alone. Further, processing in the wavelet domain reduces the number of unknowns through compression properties inherent in wavelet transforms, providing a more tract...
متن کاملSpecific absorption rate reduction using nonlinear gradient fields.
The specific absorption rate is used as one of the main safety parameters in magnetic resonance imaging. The performance of imaging sequences is frequently hampered by the limitations imposed on the specific absorption rate that increase in severity at higher field strengths. The most well-known approach to reducing the specific absorption rate is presumably the variable rate selective excitati...
متن کاملFast joint design method for parallel excitation radiofrequency pulse and gradient waveforms considering off-resonance.
A fast parallel excitation pulse design algorithm to select and to order phase-encoding (PE) locations (also known as "spokes") of an Echo-Volumar excitation k-space trajectory considering B(0) field inhomogeneity is presented. Recently, other groups have conducted research to choose optimal PE locations, but the potential benefit of considering B(0) field inhomogeneity during PE location selec...
متن کاملAnalysis of Magnetic Fields in Nonlinear Magnetic
The high magnetic energy stored in rare earthcobalt magnets a 11 ows the design of 1 i ght~tei ght motors and magnetic bearings for high speed rotors. Not subject to wear and 11i th the abi 1 i ty to operate under high vacuum conditions, magnetic bearings appear ideal for applications requiring high rotational speeds such as 100,000 rpm. Important applications are for turbomolecular pumps, lase...
متن کاملQuality of Gradient Magnetic Fields Estimation
*Faculty of Electrical Engineering and Communications, Kolejni 2906/4, 612 00 Brno, Czech Republic, Phone:+420-5-41143649, Fax:+420-5-41149512, Mail: [email protected] ** Faculty of Electrical Engineering and Communications, Kolejni 2906/4, 612 00 Brno, Czech Republic, Mail: [email protected] ***1Academy of Sciences of the Czech Republic,Institute of Scientific Instruments, K...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2015
ISSN: 0740-3194
DOI: 10.1002/mrm.25909