Table 2:
Measurements of signal intensity over the synovium and longus capitis muscles and calculation of the normalized ratios ER1, ER2, and R
| Calculations | |
|---|---|
| Synovial signal intensity | Pre = (SL+SML+SC+SMM+SM+IL+IML+IC+IMM+IM)/10, where, Pre = average precontrast synovial T1 signal intensity measured at 10 points along the synovia |
| Postn = (SL+SML+SC+SMM+SM+IL+IML+IC+IMM+IM)n /10, where, Postn = average postgadolinium synovial signal, for run n (n = 1–10) measured at 10 points along the synovia | |
| Synovial enhancementn = Postn–Pre, for each run n (n = 1–10) | |
| Longus capitis intensity | LCPRE = precontrast T1 signal in the longus capitis |
| LCPOSTn = postcontrast T1 signal in the longus capitis, for run n (n = 1–10) | |
| Longus capitis enhancementn = LCPOSTn–LCPRE, for each run n (n = 1–10) | |
| Normalized ratios | ER1 = (postgadolinium T1 signal of the TMJ synovium − the pregadolinium T1 signal of the TMJ synovium) divided by the (postgadolinium T1 signal of the longus capitis − the pregadolinium T1 signal of the longus capitis) where ER1 thus represents the ratio of the synovial enhancementn to the longus capitis enhancementn for each run n |
| ER2 = (postgadolinium T1 signal of the TMJ synovium − the pregadolinium T1 signal of the TMJ synovium) divided by the postgadolinium T1 signal of the longus capitis where ER2 thus represents the ratio of the synovial enhancementn to the LCPOSTn for each run n | |
| R = the postgadolinium T1 signal of the TMJ synovium divided by the postgadolinium T1 signal of the longus capitis and thus represents the ratio of Postn to LCPOSTn |
Note:—n indicates each run; SL, superior compartment, lateral edge; SML, superior compartment, midlateral edge; SC, superior compartment, central; SMM, superior compartment, midmedial edge; SM, superior compartment, medial edge; IL, inferior compartment, lateral edge; IML, inferior compartment, midlateral edge; IC, inferior compartment, central; IMM, inferior compartment, midmedial edge, IM, inferior compartment medial edge; LCPRE, the measurement of the T1 signal in the longus capitis muscle on the coronal pregadolinium T1 sequence; LCPOSTn, the measurement of the T1 signal in the longus capitis on the postgadolinium coronal T1 sequence for runs 1–10.