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Sei-KwonKang,Bo-YoungChoe,Tae-SukSuh,Hyoung-KooLee 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.3
In single-voxel magnetic resonance spectroscopy (MRS), the stimulated echo acquisition mode (STEAM) pulse sequence has been widely used, but if a short echo time is unnecessary, the pointresolved spectroscopy (PRESS) pulse sequence has its own advantage that, theoretically, the magnetization is twice that of STEAM, which provides a better signal-to-noise ratio (SNR). This might be helpful in the treatment of a weak signal, but, to our knowledge, there has been no theoretical description of the steady-state magnetization in PRESS. Thus, using the vector model, we derived the equation of magnetization as a function of the echo time (TE) and the repetition time (TR), and we compared the extracted T1 value of a water phantom with the simple exponentially fitted value.