Table 1.
Important concepts in MR imaging.
| Variable | Definition | Specific for | Relevance |
|---|---|---|---|
| T1 | Spin-lattice relaxation time | Tissue | Influences MR signal in tissue |
| T2 | Spin-spin relaxation time | ||
| T2* | T2* relaxation time | ||
| R1 | 1/T1 | ||
| R2 | 1/T2 | ||
| R2* | 1/T2* | ||
| TE | Echo time | Sequence | Determines the generated contrast |
| TR | Repetition time | ||
| Flip angle | Flip angle | ||
| χ | Magnetic susceptibility | Tissue | Gives extra contrast to certain substances |
| SNR | Signal-to-noise ratio | Image | Quantifies the quality of the image |
| CNR | Contrast-to-noise ratio |