Diffuse Optical Imaging Using Decomposition Methods

Table 1

Positions and optical strengths retrieved using simulated data and ICA, PCA, and NMF algorithms.

Target	Known position (mm)	Algorithm	Fitted position (mm)	Error (mm)	Known strength*	Fitted strength*	Error (%)
Sca.	(30, 30, 25)	ICA	(29.9, 30.0, 25.1)	(0.1, 0, 0.1)	−180.3	−179.9	0.22
		PCA	(30.0, 30.0, 25.0)	(0, 0, 0)	−180.3	−180.1	0.11
		NMF	(30.0, 30.0, 25.0)	(0, 0, 0)	−180.3	−178.5	1
Abs.	(50, 60, 15)	ICA	(50.1, 60.2, 15.0)	(0.1, 0.2, 0)	1.803	1.826	1.28
		PCA	(50.1, 60.1, 14.9)	(0.1, 0.1, 0.1)	1.803	1.812	0.5
		NMF	(50.1, 60.1, 15.0)	(0.1, 0.1, 0)	1.803	1.803	0

* The unit for absorption strength of the target is mm³/ns and for scattering strength is mm⁵/ns.