Wang, Ph.D. Lihong V.

Lihong V. Wang, Ph.D. Gene K. Beare Distinguished Professor

Optical Imaging Laboratory，Department of Biomedical Engineering, Washington University in St. Louis

Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis

キーワード :

We develop photoacoustic imaging technologies for in vivo early-cancer detection and functional imaging by physically combining non-ionizing electromagnetic and ultrasonic waves. Unlike ionizing x-ray radiation, non-ionizing electromagnetic waves, such as optical and radio waves, pose no health hazard and, at the same time, reveal new contrast mechanisms. Unfortunately, electromagnetic waves in the non-ionizing spectral region do not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution tomography based on non-ionizing electromagnetic waves alone, as demonstrated by confocal microscopy and two-photon microscopy as well as optical coherence tomography, is limited to superficial imaging within about one optical transport mean free path （〜1 mm in the skin） of the surface of biological tissue. Ultrasonic imaging, on the contrary, provides good image resolution but has strong speckle artifacts as well as poor contrast in early-stage tumors. We have developed ultrasound-mediated imaging modalities by combining electromagnetic and ultrasonic waves synergistically to overcome the above limitations. The hybrid modalities provide relatively deep penetration at high ultrasonic resolution and yield speckle-free images with high electromagnetic contrast.
　In photoacoustic computed tomography, a pulsed broad laser beam illuminates the biological tissue to generate a small but rapid temperature rise, which leads to emission of ultrasonic waves due to thermoelastic expansion. The short-wavelength pulsed ultrasonic waves are then detected by unfocused ultrasonic transducers. High-resolution tomographic images of optical contrast are then formed through image reconstruction. Endogenous optical contrast can be used to quantify the concentration of total hemoglobin, the oxygen saturation of hemoglobin, and the concentration of melanin. Melanoma and other tumors have been imaged in vivo in small animals. Exogenous optical contrast can be used to provide molecular imaging and reporter gene imaging.
　In photoacoustic microscopy, a pulsed laser beam is focused into the biological tissue to generate ultrasonic waves. The ultrasonic waves are then detected with a focused ultrasonic transducer to form a depth resolved 1D image directly. Raster scanning yields 3D high-resolution tomographic images. Super-depth beyond the optical transport mean free path has been reached with high spatial resolution.
　Thermoacoustic tomography is similar to photoacoustic tomography except that lowenergy microwave pulses, instead of laser pulses, are used. Although long-wavelength microwaves diffract rapidly, the short-wavelength microwave-induced ultrasonic waves provide high spatial resolution. Microwave contrast measures the concentrations of water and ions.
References
　1.X. D. Wang et al. “Noninvasive laser-induced photoacoustic tomography for structural and functional in vivo imaging of the brain,” Nature Biotech. 21, 803-6 （2003）.
　2.H.F. Zhang et al. “Functional photoacoustic microscopy for high-resolution and noninvasive in vivo imaging,” Nature Biotech. 24, 848-51 （2006）.
　3.K. Song and L.V. Wang. “Deep reflection-mode photoacoustic imaging of biological tissue,” Journal of Biomedical Optics 12, 060503 （2007）.
　4.K. Maslov et al. “Optical-resolution photoacoustic microscopy for in vivo imaging of single capillaries,” Optics Letters, 33, 929-931 （2008）.
Figure 1. Photoacoustic images. （a） A melanoma in a nude mouse; （b） melanoma image acquired in vivo by 50-MHz photoacoustic microscopy at 584 and 764 nm. Composite of the two maximum amplitude projection （MAP） images projected along the z axis. Six orders of vessel branching （1-6） can be observed. （c） 3D rendering of the melanoma acquired at 764 nm. Two MAP images at this wavelength projected along the x and y axes are shown on the side walls. The composite image in panel b is redrawn at the bottom. The top of the tumor is 0.32 mm below the skin surface, and the thickness of the tumor is 0.3 mm. （d） Close-up 2D image of the melanoma in a cross-section parallel with the z-x plane at the dashed line in panel b. （e） HE-stained histological section at the same marked location. M: melanoma. ［2］ （f） The penetration limit in chicken breast tissue using a 5-MHz photoacoustic imaging system. ［3］ （g） Photograph taken with transmission optical microscopy showing the microvasculature in a nude mouse ear. （h） In vivo photoacoustic image of the vasculature acquired with optical-resolution photoacoustic microscopy. CL: capillary; SG: sebaceous gland. ［4］