Table 1.

Configuration of donor-acceptor labelled microbubble solutions.

Group # (mole ratio)	ATTO 532-NHS $\text{mole\hspace{0.17em}ratio}=0.3$ group set I				ATTO 532-NHS $\text{mole\hspace{0.17em}ratio}=0.1$ group set II
	I1	I2	I3	I4	II1	II2	II3	II4
ATTO 647N-NHS	0	0.003	0.01	0.03	0	0.003	0.01	0.03
Amine (on microbubble)	1	1	1	1	1	1	1	1