Table 1 Top layer thickness prediction errors, for both tissue types and feature extraction methods.

From: Layer thickness prediction and tissue classification in two-layered tissue structures using diffuse reflectance spectroscopy

Feature set

Fat on muscle

Muscle on fat

Linear SVM

Exponential GPR

Linear SVM

Exponential GPR

DRS peaks

0.68 ± 0.56 mm

0.58 ± 0.55 mm

0.64 ± 0.55 mm*

0.43 ± 0.42 mm*

DRS wavelet

0.65 ± 0.56 mm

0.67 ± 0.60 mm

0.51 ± 0.39 mm

0.45 ± 0.33 mm

DRS peaks + US

0.70 ± 0.56 mm

0.61 ± 0.51 mm

0.60 ± 0.93 mm**

0.35 ± 0.33 mm**

DRS wavelet + US

0.66 ± 0.55 mm

0.66 ± 0.55 mm

0.48 ± 0.39 mm

0.39 ± 0.34 mm

US

1.62 ± 1.07 mm

1.23 ± 0.96 mm

0.75 ± 0.77 mm

0.53 ± 0.60 mm

  1. *p < 0.0001, **p < 0.001.