(A) Absorbance spectra of control, targeted and non-targeted phantoms. (B), (D), and (F) PA images (λ = 532 nm) of control, targeted, and non-targeted phantoms, respectively. (C), (E), and (G) PA images (λ = 680 nm) of control, targeted, and non-targeted phantoms, respectively. (Reprinted with permission from ref 106. Copyright 2007 The Optical Society of America.)