FLASH is the most commonly used gradient spoiled gradient-echo MRI-sequence for anatomical images developed & patented by Frahm, Haase, Hänicke, Merboldt, and D Matthaei. It is optimized for low-flip angles and allowed a shortening of acquisition time due to remaining longitudinal magnetization with low angles at repetition times significantly shorter than T1, avoiding saturation. In the actual implementation of the pulse sequence, RF spoiling may also be incorporated as well, thus some vendors do not distinguish these two.
For gradient-echo with gradient spoiled, its acronym is "MPGR" for GE, "GE/GRE" for Hitachi, "FLASH" for Siemens, and "Field Echo" for Toshiba.
For gradient-echo with RF spoiling, its acronym is "SPGR" and "FSPGR" for GE, "GE/GFE" for Hitachi, "T1 FFE" for Philips, and "Field Echo" for Toshiba.