1.Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
2.Institute for Medical Engineering & Science, Massachusetts Institute of Technology, 45 Carleton St., Cambridge, MA 02142, USA
3.Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, MA 02421, USA
Xiang Zhang (xzhang88@mit.edu)
Brian W. Anthony (banthony@mit.edu)
纸质出版日期:2019,
网络出版日期:2019-12-20,
收稿日期:2019-06-20,
修回日期:2019-11-25,
录用日期:2019-11-27
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Full noncontact laser ultrasound: first human data[J]. LSA, 2019,8(6):1198-1208.
Zhang, X. et al. Full noncontact laser ultrasound: first human data. Light: Science & Applications, 8, 1198-1208 (2019).
Full noncontact laser ultrasound: first human data[J]. LSA, 2019,8(6):1198-1208. DOI: 10.1038/s41377-019-0229-8.
Zhang, X. et al. Full noncontact laser ultrasound: first human data. Light: Science & Applications, 8, 1198-1208 (2019). DOI: 10.1038/s41377-019-0229-8.
Full noncontact laser ultrasound (LUS) imaging has several distinct advantages over current medical ultrasound (US) technologies: elimination of the coupling mediums (gel/water)
operator-independent image quality
improved repeatability
and volumetric imaging. Current light-based ultrasound utilizing tissue-penetrating photoacoustics (PA) generally uses traditional piezoelectric transducers in contact with the imaged tissue or carries an optical fiber detector close to the imaging site. Unlike PA
the LUS design presented here minimizes the optical penetration and specifically restricts optical-to-acoustic energy transduction at the tissue surface
maximizing the generated acoustic source amplitude. With an appropriate optical design and interferometry
any exposed tissue surfaces can become viable acoustic sources and detectors. LUS operates analogously to conventional ultrasound but uses light instead of piezoelectric elements. Here
we present full noncontact LUS results
imaging targets at ~5 cm depths and at a meter-scale standoff from the target surface. Experimental results demonstrating volumetric imaging and the first LUS images on humans are presented
all at eye- and skin-safe optical exposure levels. The progression of LUS imaging from tissue-mimicking phantoms
to excised animal tissue
to humans in vivo is shown
with validation from conventional ultrasound images. The LUS system design insights and results presented here inspire further LUS development and are a significant step toward the clinical implementation of LUS.
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