Three-dimensional diffuse optical mammography with ultrasound localization in a human subject

被引:104
作者
Holboke, MJ
Tromberg, BJ [1 ]
Li, X
Shah, N
Fishkin, J
Kidney, D
Butler, J
Chance, B
Yodh, AG
机构
[1] Univ Calif Irvine, Beckman Laser Inst, Irvine, CA 92612 USA
[2] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[3] MIT, Dept Elect Engn, Boston, MA USA
[4] Univ Calif Irvine, Med Ctr, Dept Radiol, Irvine, CA 92612 USA
[5] Univ Calif Irvine, Med Ctr, Dept Surg, Irvine, CA 92612 USA
[6] Univ Penn, Dept Biochem & Biophys, Philadelphia, PA 19104 USA
关键词
diffuse optical tomography; near infrared imaging; photon migration; breast optical properties;
D O I
10.1117/1.429992
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
We describe an approach that combines clinical ultrasound and photon migration techniques to enhance the sensitivity and information content of diffuse optical tomography. Measurements were performed on a postmenopausal woman with a single 1.8x0.9 cm malignant ductal carcinoma in situ approximately 7.4 mm beneath the skin surface (UCI IRB protocol 95-563). The ultrasound-derived information about tumor geometry enabled us to segment the breast tissue into tumor and background regions. Optical data was obtained with a multifrequency, multiwavelength hand-held frequency-domain photon migration backscattering probe. The optical properties of the tumor and background were then computed using the ultrasound-derived geometrical constraints. An iterative perturbative approach, using parallel processing, provided quantitative information about scattering and absorption simultaneously with the ability to incorporate and resolve complex boundary conditions and geometries. A three to four fold increase in the tumor absorption coefficient and nearly 50% reduction in scattering coefficient relative to background was observed (lambda=674, 782, 803, and 849 nm). Calculations of the mean physiological parameters reveal fourfold greater tumor total hemoglobin concentration [Hb(tot)] than normal breast (67 mu M vs 16 mu M) and tumor hemoglobin oxygen saturation (SOx) values of 63% (vs 73% and 68% in the region surrounding the tumor and the opposite normal tissue, respectively). Comparison of semi-infinite to heterogeneous models shows superior tumor/background contrast for the latter in both absorption and scattering. Sensitivity studies assessing the impact of tumor size and refractive index assumptions, as well as scan direction, demonstrate modest effects on recovered properties. (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S1083-3668(00)01502-1].
引用
收藏
页码:237 / 247
页数:11
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