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2018 ; 8
(1
): 11123
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Quad-mode functional and molecular photoacoustic microscopy
#MMPMID30042404
Liu W
; Shcherbakova DM
; Kurupassery N
; Li Y
; Zhou Q
; Verkhusha VV
; Yao J
Sci Rep
2018[Jul]; 8
(1
): 11123
PMID30042404
show ga
A conventional photoacoustic microscopy (PAM) system typically has to make
tradeoffs between its spatial resolution and penetration depth, by choosing a
fixed configuration of optical excitation and acoustic detection. The
single-scale imaging capability of PAM may limit its applications in biomedical
studies. Here, we report a quad-mode photoacoustic microscopy (QM-PAM) system
with four complementary spatial resolutions and maximum penetration depths. For
this we first developed a ring-shaped focused ultrasound transducer that has two
independent elements with respective central frequencies at 20?MHz and 40?MHz,
providing complementary acoustically-determined spatial resolutions and
penetration depths. To accommodate the dual-element ultrasound transducer, we
implemented two optical excitation modes to provide tightly- and weakly-focused
light illumination. The dual-element acoustic detection combined with the two
optical focusing modes can thus provide four imaging scales in a single imaging
device, with consistent contrast mechanisms and co-registered field of views. We
have demonstrated the multiscale morphological, functional, and molecular imaging
capability of QM-PAM in the mouse head, leg and ear in vivo. We expect the high
scale flexibility of QM-PAM will enable broad applications in preclinical
studies.