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US-guided DOT probe. The foot-print of the combined DOT probe is approximately 10 cm. Four source laser diodes of 730 nm, 785 nm, 808 nm and 830 nm optical wavelengths were sequentially switched to nine source positions (pointed by an arrow) on the probe, while the reflected light was coupled by the 14 light guides (pointed by an arrow) to 14 parallel detectors
