Ultrasound-mediated biophotonic imaging: a review of acousto-optical tomography and photo-acoustic tomography.
This article reviews two types of ultrasound-mediated biophotonic imaging-acousto-optical tomography (AOT, also called ultrasound-modulated optical tomography) and photo-acoustic tomography (PAT, also called opto-acoustic or thermo-acoustic tomography)-both of which are based on non-ionizing optical and ultrasonic waves. The goal of these technologies is to combine the contrast advantage of the optical properties and the resolution advantage of ultrasound. In these two technologies, the imaging contrast is based primarily on the optical properties of biological tissues, and the imaging resolution is based primarily on the ultrasonic waves that either are provided externally or produced internally, within the biological tissues. In fact, ultrasonic mediation overcomes both the resolution disadvantage of pure optical imaging in thick tissues and the contrast and speckle disadvantages of pure ultrasonic imaging. In our discussion of AOT, the relationship between modulation depth and acoustic amplitude is clarified. Potential clinical applications of ultrasound-mediated biophotonic imaging include early cancer detection, functional imaging, and molecular imaging.
Wang
Lihong V
LV
Optical Imaging Laboratory, Department of Biomedical Engineering, Texas A&M University, 3120 TAMU, College Station, TX 77843-3120, USA. LWang@tamu.edu
D000162:Acoustics; D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D003952:Diagnostic Imaging / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D015233:Models, Statistical; D009369:Neoplasms / Q000175:diagnosis* / Q000473:pathology; D017550:Spectroscopy, Fourier Transform Infrared; D013382:Subtraction Technique; D014054:Tomography / Q000379:methods*; D014465:Ultrasonics; D016217:Ultrasonography, Mammary / Q000379:methods*