Improved sensitivity to overlapping multiplet signals in in vivo proton spectroscopy using a multiecho volume selective (CPRESS) experiment.
A method for volume selective proton spectroscopy is presented based on a multiecho sequence with short refocusing interval tcp. It is demonstrated, that by appropriate choice of tcp on the order of 4-6 ms, signals from overlapping multiplets like the glutamine and glutamate (Glu/Gln) resonances in spectra of the human brain are considerably increased compared with a conventional PRESS volume selection scheme. Thus proton spectra from J-coupled multiplet signals can be acquired with TE on the order of 20-30 ms avoiding the baseline problems arising at shorter echo times due to broad resonances. This allows to selectively acquire spectra from substances with longer T2 without the confounding effects from J-coupling occurring in conventional volume selection techniques.
Hennig
J
J
Abt. Röntgendiagnostik, University Freiburg, Germany.
Thiel
T
T
Speck
O
O
D000409:Alanine / Q000032:analysis; D001224:Aspartic Acid / Q000031:analogs & derivatives / Q000032:analysis; D001921:Brain / Q000378:metabolism; D002794:Choline / Q000032:analysis; D003401:Creatine / Q000032:analysis; D006801:Humans; D007294:Inositol / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012680:Sensitivity and Specificity; D013654:Taurine / Q000032:analysis; D005680:gamma-Aminobutyric Acid / Q000032:analysis
D013654:Taurine; D001224:Aspartic Acid; D007294:Inositol; D005680:gamma-Aminobutyric Acid; C000179:N-acetylaspartate; D003401:Creatine; D002794:Choline; D000409:Alanine