Figure 2.

(A) Pulse acquire, (B) T₂-weighted echo sum (T₂ = 154 ms) ³¹P MR spectra [AMESING sequence (31)] from a voxel (2 cm × 4 cm × 4 cm) of the breast (average of five volunteers) scaled to the same noise, and (C) pulse-acquire ³¹P MR spectrum from the liver (average of five volunteers). Note that only the aqueous metabolites with long T₂-values, such as PE, PC, Pi, and GPC get enhanced in the T₂-weighted echo sum and that the chemical shifts of liver GPE and GPC do not match the PDE signals from the breast, but are shifted +0.5 ppm.