(PRESS) Point resolved spectroscopy is a multi echo single shot technique to obtain spectral data. PRESS is a 90°-180°-180° (slice selective pulses) sequence. The 90° radio frequency pulse rotates the spins in the yx-plane, followed by the first 180° pulse (spin rotation in the xz-plane) and the second 180° pulse (spin rotation in the xy-plane), which gives the signal.
With the long echo times used in PRESS, there is a better visualization of metabolites with longer relaxation times. Many of the metabolites depicted by stimulated echo technique are not seen on point resolved spectroscopy, but PRESS is less susceptible to motion, diffusion, and quantum effects and has a better SNR than stimulated echo acquisition mode (STEAM).

(STEAM) A single volume spectroscopy method. The stimulated echo acquisition mode techniques is similar to Point Resolved Spectroscopy (PRESS). The STEAM sequence use a 90°-90°-90° pulse sequence instead of 90°-180°-180° pulses.

(VEST) The 'Volume Excitation Stimulated Echoes' sequence is a method similar to point resolved spectroscopy with stimulated echoes and volume selective excitation.