Diffuse reflectance spectroscopy has been previously explored as a promising method for providing real-time visual
maps of tissue composition to help surgeons determine breast lumpectomy margins and to ensure the complete removal
of a tumor during surgery. We present the simple design, validation, and implementation of a compact and cost-effective
spectral imaging system for the application of tumor margin assessment. Our new system consists of a broadband source
with bandpass filters for illumination and a fabricated custom 16-pixel photodiode imaging array for the detection of
diffuse reflectance. The system prototype was characterized in tissue-mimicking phantoms and has an SNR of greater
than 40 dB in phantoms, animals, and human tissue. We show proof-of-concept for performing fast, wide-field spectral
imaging with a simple, inexpensive design. The strategy also allows for the scaling to higher pixel number and density in
future iterations of the system.
LEDs can be used as light emitters as well as detectors. It is known that like any PN junction, an LED too can be
modeled as a capacitor in parallel with a light dependent current source<sup> </sup>. 'ePaper' exploits this property of LEDs.
'ePaper' is an LED based graphic tablet which allows a user to write or sketch on an inexpensive hand held device.
Multiple pages can be saved on the device which can be scrolled through and uploaded to a computer as bitmaps. ePaper
is designed to be scalable to any desired dimension.