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| Imaging Modalities | Spatial Resolution | Real Time | Penetration Depth | Drug Tracking Capability | Portability | Cost |
|---|---|---|---|---|---|---|
| Micro-US | 20–100μm | Yes | 10mm | No | High | Low |
| Micro-MRI | 200μm | No | Full body | Yes | Low | High |
| Fluorescence microscopy | 0.2–1μm | Yes | 0.3–1.0mm | Yes | High | Low |
| OCT | 1–15μm | Yes | 1–3mm | No | High | Low |
| Micro-CT | 5μm | No | Full body | Yes | Low | Medium |
US= ultrasound; MRI= magnetic resonance imaging; OCT= optical coherence tomography; CT= computed tomography
