Variable at baseline | ∆Vol10fr(%) | ∆Volpost(%) |
---|
Spearman’s Rho | p-value | Spearman’s Rho | p-value |
---|
ADC | − 0.185 | 0.100 | −0.010 | 0.932 |
Dt | −0.099 | 0.385 | −0.061 | 0.609 |
f
| −0.056 | 0.620 | −0.002 | 0.986 |
D* | −0.019 | 0.865 | −0.188 | 0.109 |
D* × f | −0.007 | 0.950 | −0.167 | 0.154 |
Ktrans | 0.210 | 0.069 | 0.434 |
< 0.001
|
Kep | 0.239 |
0.038
| 0.349 |
0.003
|
ve | 0.025 | 0.832 | 0.174 | 0.143 |
IAUGC | 0.139 | 0.231 | 0.375 |
0.001
|
Parotid volume | −0.242 |
0.031
| −0.056 | 0.636 |
Age | −0.108 | 0.341 | 0.045 | 0.702 |
Weight | −0.396 |
< 0.001
| −0.135 | 0.253 |
BMI | −0.368 |
0.001
| −0.127 | 0.281 |
Dmean(Gy) | 0.226 |
0.044
| −0.007 | 0.951 |
V30(%) | 0.266 |
0.017
| 0.086 | 0.468 |
- Statistically significant p-values are bold. Abbreviations: ∆Vol10fr Parotid shrinkage(%) at the 10th fraction, ∆Volpost Parotid shrinkage(%) 8 weeks after RT, ADC Apparent diffusion coefficient, Dt Tissue diffusion coefficient, D* Perfusion-related diffusion coefficient, f(%) Perfusion fraction, D* × f Product of D* by f, ∆ADC ADC variation (%) relative to the pretreatment value (analogously for the other imaging variables), Ktrans Transfer constant between plasma and EES (extravascular extracellular space), Kep Transfer constant between EES and plasma, ve Fractional volume of EES, IAUGC Initial area under gadolinium concentration curve, BMI Body mass index, Dmean Planned mean dose to the parotid gland, V30(%) Percentage of parotid volume receiving a dose ≥30 Gy