Transverse relaxation time T2 and the corresponding proton density was measured by a 0.3 T 1HYOMINGMR2 NMR spectrometer (Ningbo, Zhejiang, China) and calculated using a CPMG pulse sequence,
Transverse relaxation time T2 and the corresponding protondensity was measured by a 0.3 T 1HYOMINGMR2 NMR spectrometer(Ningbo, Zhejiang, China) and calculated using a CPMG pulsesequence,