Table 1.

Comparison of penetration depths and resolution of imaging techniques applied to skin imaging.

Imaging Modality	Maximum Penetration Depth	Maximum Resolution
Confocal microscopy	0.2 mm [7]	0.5–1 μm [7]
High-definition optical coherence tomography	0.57 mm [2,3]	<3 μm [2,3]
Optical coherence tomography	2 mm [7]	4–10 μm [7]
High-frequency ultrasound	15 mm [6]	300 μm [6]
Computed tomography	Total body penetration [7]	100 μm [7]
Magnetic resonance imaging	Total body penetration [7]	100 μm [7]