Ms. Naeeme Modir Profile

Naeeme Modir

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Publications (3)

Proceedings Article | 12 March 2024 Poster + Paper

Optimization of a real-time LED based spectral imaging system

Kelden Pruitt, Naeeme Modir, Nati Nawawithan, Minh Tran, Baowei Fei

Proceedings Volume 12853, 128530D (2024) https://doi.org/10.1117/12.3005452

KEYWORDS: Light emitting diodes, Imaging systems, Light sources and illumination, Prototyping, Endoscopy, Cameras, Design, Sensors, Hyperspectral imaging, Mathematical optimization

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±We are designing a real-time spectral imaging system using micro-LEDs and a high-speed micro-camera for potential endoscopic applications. Currently, gastrointestinal (GI) endoscopic imaging has largely been limited to white light imaging (WLI), while other endoscopic approaches have seen advancements in imaging techniques including fluorescence imaging, narrow-band imaging, and stereoscopic visualization. To further advance GI endoscopic imaging, we are working towards a high-speed spectral imaging system that can be implemented with a chip-on-tip design for a flexible endoscope. Hyperspectral imaging has potential applications in a variety of imaging procedures with its ability to discern spectral footprints of the imaging field in a series of two-dimensional images at different wavelengths. For investigating the feasibility of a real-time LED-based hyperspectral imaging system for endoscopic applications we designed and developed a large-scale prototype using through-hole LEDs, which is further analyzed as we design our future system. For high quality imaging, the LED array must be designed with the specific illumination patterns and intensities of each LED considered. We present our work in optimizing our current LED array through optical simulations performed in silico. Damped least squares and orthogonal descent algorithms are implemented to maximize irradiance power and improve illumination homogeneity at several working distances by adjusting radial distances of each LED from the camera. With our prototype LED-based hyperspectral imaging system, the simulation and optimization approach achieved an average increase of 8.36 ± 8.79% in irradiance and a 4.3% decrease in standard deviation at multiple working distances and field-of-views for each LED, as compared to the original design, leading to improved image quality and maintained acquisition speeds. This work highlights the value of in silico optical simulation and provides a framework for improved optical system design and will inform design decisions in future works.

Proceedings Article | 2 March 2022 Presentation + Paper

LED-based hyperspectral endoscopic imaging

Naeeme Modir, Maysam Shahedi, James Dormer, Ling Ma, Mohammadaref Ghaderi, Shashank Sirsi, Yi-Shing Lisa Cheng, Baowei Fei

Proceedings Volume 11954, 1195408 (2022) https://doi.org/10.1117/12.2609023

KEYWORDS: Imaging systems, Cameras, Tissues, Light emitting diodes, Hyperspectral imaging, Prototyping, Calibration, Endoscopy, Cancer, Endoscopes

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Proceedings Article | 5 March 2021 Poster + Presentation + Paper

Development of a real-time spectral imaging system using in-site micro-LED-based illumination and high-speed micro-camera for endoscopic applications

Naeeme Modir, Maysam Shahedi, James Dormer, Baowei Fei

Proceedings Volume 11654, 1165417 (2021) https://doi.org/10.1117/12.2579097

KEYWORDS: Imaging systems, Endoscopy, Imaging spectroscopy, Light emitting diodes, Visible radiation, Tumors, Tissues, Spectral resolution, Spatial resolution, Multispectral imaging

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