Comparison of Time-Frequency Analysis Methods for Radio Frequency Pulses Used in Magnetic Resonance

doi:10.11938/cjmr20160414

Chinese Journal of Magnetic Resonance ›› 2016, Vol. 33 ›› Issue (4): 646-654.doi: 10.11938/cjmr20160414

Comparison of Time-Frequency Analysis Methods for Radio Frequency Pulses Used in Magnetic Resonance

DU Qing-yang^1,2, CHANG Yan², QIAN Song-song¹, YANG Xiao-dong²

1. College of Electrical Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China;
2. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China

Received:2016-04-11 Revised:2016-10-24 Online:2016-12-05 Published:2016-12-05

Abstract

Abstract: Accurate manipulation of spin systems can be achieved by radio frequency (RF) pulses, which play a key role in nuclear magnetic resonance (NMR). This paper analyses the time-frequency characteristics of RF pulses, such as the optimal shaped pulse, using different time-frequency analysis methods such as short-time Fourier transform (STFT), continuous wavelet transform (CWT) and Wigner-Ville distribution (WVD). The performances of these methods were then compared. The results indicated that combination of the above methods may achieve a better performance in analyzing the amplitude and phase distribution of complex RF pulse in joint time-frequency domain. The research provides a reference for understanding of the effects of complex RF pulses on specific spin systems.

Key words: radio frequency pulse, short-time Fourier transform(STFT), Wigner-Ville distribution(WVD), continuous wavelet transform(CWT), time-frequency analysis

CLC Number:

O482.53

DU Qing-yang, CHANG Yan, QIAN Song-song, YANG Xiao-dong. Comparison of Time-Frequency Analysis Methods for Radio Frequency Pulses Used in Magnetic Resonance[J]. Chinese Journal of Magnetic Resonance, 2016, 33(4): 646-654.

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Comparison of Time-Frequency Analysis Methods for Radio Frequency Pulses Used in Magnetic Resonance

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