Proton magnetic resonance spectroscopy in a normal patient A: Stimulated echo acquisition mode technique with short echo delay (35 ms) demonstrates normal choline (Cho), creatine (Cr), N-acetyl aspartate (NAA), and myoinositol (Myo) peaks. B: Point resolved spectroscopy (PRESS) technique with a long echo delay (288 ms) in the same location demonstrates only choline, creatine, and NAA peaks. Due to the long echo time, the myoinositol peak is not seen with PRESS.