Vohra, Nagma, Tyler Bowman, Keith Bailey, and Magda El-Shenawee. "Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors." Journal of Visualized Experiments 158 (2020).
This manuscript presents a protocol to handle, characterize, and image freshly excised human breast tumors using pulsed terahertz imaging and
spectroscopy techniques. The protocol involves terahertz transmission mode at normal incidence and terahertz reflection mode at an oblique
angle of 30°. The collected experimental data represent time domain pulses of the electric field. The terahertz electric field signal transmitted
through a fixed point on the excised tissue is processed, through an analytical model, to extract the refractive index and absorption coefficient
of the tissue. Utilizing a stepper motor scanner, the terahertz emitted pulse is reflected from each pixel on the tumor providing a planar image
of different tissue regions. The image can be presented in time or frequency domain. Furthermore, the extracted data of the refractive index
and absorption coefficient at each pixel are utilized to provide a tomographic terahertz image of the tumor. The protocol demonstrates clear
differentiation between cancerous and healthy tissues. On the other hand, not adhering to the protocol can result in noisy or inaccurate images
due to the presence of air bubbles and fluid remains on the tumor surface. The protocol provides a method for surgical margins assessment of
breast tumors.
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