Nerve detection with optical spectroscopy for regional anesthesia procedures

Table 2 Classification results according to SVM, PLS-DA and CART for discrimination of fascicular tissue of the median nerve from the surrounding tissues validation data collected in the forearm area) when training the various methods using data collected in the neck area

Classification method	Feature selection	MCC	ACC	SENS (%)	SPEC (%)	PPV	NPV	TP	FN	FP	TN
SVM	Fit	0.683	0.848	85.0	84.6	0.765	0.906	91	16	28	154
SVM	PCA	0.693	0.855	83.2	86.8	0.788	0.898	89	18	24	158
SVM	Segments	0.717	0.862	88.8	84.6	0.772	0.928	95	12	28	154
SVM	Combined	0.751	0.882	86.9	89.0	0.823	0.920	93	14	20	162
PLSDA	10PC’s	0.580	0.789	84.1	75.8	0.672	0.890	90	17	44	138
CART	Fit	0.442	0.730	71.0	74.2	0.618	0.813	76	31	47	135

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