Table 1. Comparison of molecular imaging methods and probes for NO detection.

Modality	Resolution	Specificity	Sensitivity	Penetration	Ref.
EPR	mm	High	nM	Good	5 and 22
MRI	mm	High	μM	Good	6b
Optical	μm	Low	nM	Medium	8b and 23
DHPFQ	μm	High	nM	Good (potential)	This work