| MRI Sequences |
| Overview |
Goal: Optimization of signal from a target tissue
Strategy: Manipulation of the radiofrequency pulses and gradients
Result: >100 different sequences with vendor specific, confusing acronyms
|
| Example Acronyms |
| Type of sequence
| Philips
| Siemens
| GE
| Hitachi
| Toshiba
| | Spin Echo (SE)
| SE
| SE
| SE
| SE
| SE
| | Multi echo SE
| Multi SE
|
Multi-echo
MS
| SE
| SE
| Multi-echo
| | Fast SE
| Turbo SE
| Turbo SE
| Fast SE
| Fast SE
| Fast SE
| | Ultra fast SE
|
SSH-TSE
UFSE
|
SSTSE
HASTE
| SS-FSE
| FSE - ADA
|
(Super)FASE
DIET
| | IR
|
IR
IR TSE
|
IR/IRM
TurboIR/TIRM
|
IR
FSE-IR
|
IR
FIR
|
IR
Fast IR
| | STIR
|
STIR
STIR TSE
|
STIR
Turbo STIR
|
STIR
Fast STIR
|
STIR
Fast STIR
|
STIR
Fast STIR
| | FLAIR
|
FLAIR
FLAIR TSE
|
FLAIR
Turbo FLAIR
|
FLAIR
Fast FLAIR
|
FLAIR
Fast FLAIR
|
FLAIR
Fast FLAIR
| | Gradient echo (GE)
| FFE
| GRE
| GRE
| GE
| FE
| | Spoiled GE
| T1-FFE
| FLASH
|
SPGR
MPSPGR
| RSSG
| RF-spoiled FE
| | Ultra fast GE
|
T1-TFE
T2-TFE THRIVE
| TurboFLASH VIBE
|
FGRE
Fast SPGR
FMPSPGR
VIBRANT
FAME
LAVA
| SARGE
| Fast FE
RADIANCE
QUICK 3D
| | Ultrafast GE with magnetization preparation
| IR-TFE
| T1/T2-TurboFLASH
|
IR-FSPGR
DE-FSPGR
|
| Fast FE
| | Steady state GE
| FFE
| FISP
| MPGR, GRE
| TRSG
| FE
| | Contrast enhanced steady state GE
| T2-FFE T2
| PSIF
| SSFP
|
| FE
| | Balanced GE
|
Balanced
FFE
| True FISP
| FIESTA
| BASG
| True SSFP
| | SE-Echo planar
| SE-EPI
| EPI SE
| SE EPI
| SE EPI
| SE EPI
| | GE-Echo planar
|
FFE-EPI
TFE-EPI
|
EPI Perf
EPIFI
| GRE EPI
| SG-EPI
| FE-EPI
| | Hybrid echo
| GRASE
| TGSE
|
|
| Hybrid EPI
|
Table from: IMAIOS.
|
| Identifying Sequences |
- At least two ways of grouping sequences
- By weighting (T1, T2, proton density)
- By acquisition type (SE, GRE, IR)
- The type of sequence chosen is influenced by
- Clinical question
- Speed of acquisition
- Signal or quality of acquisition
|
KRISTIN PORTER, MD, PHD PAMELA JOHNSON, MD