TABLE 2.
Response function model comparison in terms of RMSR and AIC for WM, GM, and CSF, performed on data set 1a. The total amount of parameters n θ is included in the parentheses after each model name
| WM model type (n θ) | RMSR | AIC |
|---|---|---|
| DTI AS (3) | 12.423 | 3.02744 × 105 |
| DKI AS (6) | 11.370 | 2.92103 × 105 |
| DKI AS NF (7) | 11.369 | 2.92098 × 105 |
| GM model type (n θ) | RMSR | AIC |
|---|---|---|
| DTI ISO (2) | 34.077 | 4.30829 × 105 |
| DKI ISO (3) | 33.717 | 4.29532 × 105 |
| DKI ISO + offset (4) | 33.705 | 4.29491 × 105 |
| CSF model type (n θ) | RMSR | AIC |
|---|---|---|
| DTI ISO (2) | 30.551 | 3.62269 × 105 |
| DKI ISO (3) | 30.184 | 3.60991 × 105 |
| DKI ISO + offset (4) | 29.630 | 3.59029 × 105 |
Abbreviations: AIC, Akaike Information Criterion; AS, axially symmetric; CSF, cerebrospinal fluid; DKI, diffusion kurtosis imaging; GM, gray matter; RMSR, root mean squared residual; WM, white matter.