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Bruk av CPMG sekvenser med fasesyklede refokuseringspulser i innside-ut NMRfor fasekoding av bilder og for å eliminere koherent ringing iett skann
Bruk av CPMG sekvenser med fasesyklede refokuseringspulser i innside-ut NMRfor fasekoding av bilder og for å eliminere koherent ringing iett skann
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机译:由内而外NMR将CPMG序列与相循环重聚焦脉冲一起用于图像的相位编码并消除一次扫描的相干振铃
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摘要
A method for performing phase encoded inside-out magnetic resonance imaging. The phase of the nuclear spin is advanced by applying a magnetic field gradient between application of each of several refocusing pulse sequences so that echoes are detected during refocusing pulse sequences for different phase advances. The echoes detected for each refocusing sequence are added together and averaged. An image is then generated from the averaged echoes, such as by Fourier transform techniques. In addition, a method is provided for eliminating ringing while measuring a nuclear magnetic resonance property of a volume of earth formation surrounding a borehole. The phase of the refocusing pulses is changed so that pairs of echoes in the echo train have opposite ringing phase. Echoes in the echo train having opposite ringing phase are added to cancel ringing in the echo train. The echo train can then be analyzed for amplitude and/or decay characteristics.
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