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Schematic and photography of high-resolution intravascular PA endoscope (PAE) from design to assembly: (a) Schematic of the PAE before assembly, (b) Schematic of PAE after assembly, (c) Principle description of the system, (d) Micrograph of the PAE. SMF, single-mode fiber; H, housing; TRP, total-reflection prism; T, transducer [130].
