Dr. Brett A. Johnson Profile

Dr. Brett A. Johnson

at Univ of Texas Southwestern Medical Ctr at Dallas

SPIE Involvement:

Author

Publications (11)

SPIE Journal Paper | 13 August 2024 Open Access

Design and validation of a high-speed hyperspectral laparoscopic imaging system

Kelden Pruitt, Ling Ma, Armand Rathgeb, Jeffrey Gahan, Brett Johnson, Douglas Strand, Baowei Fei

JBO, Vol. 29, Issue 09, 093506, (August 2024) https://doi.org/10.1117/12.10.1117/1.JBO.29.9.093506

KEYWORDS: Cameras, Imaging systems, Laparoscopy, Tissues, Reflectivity, Hyperspectral imaging, Near infrared, Spatial resolution, Design, Tunable filters

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SignificanceMinimally invasive surgery (MIS) has shown vast improvement over open surgery by reducing post-operative stays, intraoperative blood loss, and infection rates. However, in spite of these improvements, there are still prevalent issues surrounding MIS that may be addressed through hyperspectral imaging (HSI). We present a laparoscopic HSI system to further advance the field of MIS.AimWe present an imaging system that integrates high-speed HSI technology with a clinical laparoscopic setup and validate the system’s accuracy and functionality. Different configurations that cover the visible (VIS) to near-infrared (NIR) range of electromagnetism are assessed by gauging the spectral fidelity and spatial resolution of each hyperspectral camera.ApproachStandard Spectralon reflectance tiles were used to provide ground truth spectral footprints to compare with those acquired by our system using the root mean squared error (RMSE). Demosaicing techniques were investigated and used to measure and improve spatial resolution, which was assessed with a USAF resolution test target. A perception-based image quality evaluator was used to assess the demosaicing techniques we developed. Two configurations of the system were developed for evaluation. The functionality of the system was investigated in a phantom study and by imaging ex vivo tissues.ResultsMultiple configurations of our system were tested, each covering different spectral ranges, including VIS (460 to 600 nm), red/NIR (RNIR) (610 to 850 nm), and NIR (665 to 950 nm). Each configuration is capable of achieving real-time imaging speeds of up to 20 frames per second. RMSE values of 3.51±2.03%, 3.43±0.84%, and 3.47% were achieved for the VIS, RNIR, and NIR systems, respectively. We obtained sub-millimeter resolution using our demosaicing techniques.ConclusionsWe developed and validated a high-speed hyperspectral laparoscopic imaging system. The HSI system can be used as an intraoperative imaging tool for tissue classification during laparoscopic surgery.

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Proceedings Article | 1 April 2024 Poster + Paper

Feature extraction of ultrasound radiofrequency data for the classification of the peripheral zone of human prostate

Teja Pathour, Ling Ma, Douglas Strand, Jeffrey Gahan, Brett Johnson, Shashank Sirsi, Baowei Fei

Proceedings Volume 12932, 129321F (2024) https://doi.org/10.1117/12.3008643

KEYWORDS: Prostate, Ultrasonography, Radiomics, Feature extraction, Tissues, Tunable filters, Image segmentation, Prostate cancer, Image filtering, Acoustics

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Proceedings Article | 29 March 2024 Presentation + Paper

Dense surface reconstruction using a learning-based monocular vSLAM model for laparoscopic surgery

James Yu, Kelden Pruitt, Nati Nawawithan, Brett Johnson, Jeffrey Gahan, Baowei Fei

Proceedings Volume 12928, 129280J (2024) https://doi.org/10.1117/12.3008768

KEYWORDS: Laparoscopy, Cameras, Light sources and illumination, Video, 3D modeling, Surgery, Education and training, Depth maps, Tissues, Reconstruction algorithms

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Proceedings Article | 29 March 2024 Presentation + Paper

An augmented reality-guided biopsy system using a high-speed motion tracking and real-time registration platform

Patric Bettati, Jeff Young, Armand Rathgeb, Nati Nawawithan, Jeffrey Gahan, Brett Johnson, Ryan Aspenleiter, Fintan Browne, Aditi Chaudhari, Aditya Guin, Varin Sikand, Grant Webb, Jeremy Sherey, Alsadiq Shammet, Baowei Fei

Proceedings Volume 12928, 129281G (2024) https://doi.org/10.1117/12.3008573

KEYWORDS: Biopsy, Augmented reality, Prostate, Calibration, Imaging systems, 3D modeling, Visualization, Optical tracking, Holograms, Computed tomography

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Proceedings Article | 29 March 2024 Presentation + Paper

An augmented reality and high-speed optical tracking system for laparoscopic surgery

Nati Nawawithan, Jeff Young, Patric Bettati, Armand Rathgeb, Kelden Pruitt, Jordan Frimpter, Henry Kim, Jonathan Yu, Davis Driver, Amanuel Shiferaw, Aditi Chaudhari, Brett Johnson, Jeffrey Gahan, James Yu, Baowei Fei

Proceedings Volume 12928, 129280E (2024) https://doi.org/10.1117/12.3008448

KEYWORDS: Laparoscopy, Surgery, Augmented reality, 3D modeling, Autoregressive models, Holograms, Video, Cameras, Motion models, Imaging systems

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Proceedings Article | 13 March 2024 Presentation + Paper

A dual-camera hyperspectral laparoscopic imaging system

Kelden Pruitt, Armand Rathgeb, Jeffrey Gahan, Brett Johnson, Douglas Strand, Baowei Fei

Proceedings Volume 12831, 1283107 (2024) https://doi.org/10.1117/12.3005893

KEYWORDS: Tissues, Imaging systems, Reflectivity, Laparoscopy, Hyperspectral imaging, Cameras, Spectroscopy, Tunable filters, Optical filters, Calibration

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Proceedings Article | 3 April 2023 Presentation + Paper

A high-speed hyperspectral laparoscopic imaging system

Kelden Pruitt, Brett Johnson, Jeffrey Gahan, Ling Ma, Baowei Fei

Proceedings Volume 12466, 1246608 (2023) https://doi.org/10.1117/12.2653922

KEYWORDS: Tissues, Imaging systems, Reflectivity, Laparoscopy, Hyperspectral imaging, Cameras, Spatial resolution, Calibration, Liver, Kidney

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Proceedings Article | 4 April 2022 Poster + Presentation + Paper

A low-cost PVC-based dual-modality kidney phantom

Jeff Young, Maysam Shahedi, James Dormer, Brett Johnson, Jeffrey Gahan, Baowei Fei

Proceedings Volume 12034, 120342Q (2022) https://doi.org/10.1117/12.2611592

KEYWORDS: Kidney, Silicon, Tissues, X-ray imaging, 3D image processing, Liquids, Biopsy, 3D printing, X-ray computed tomography, X-rays, Ultrasound real time imaging

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Proceedings Article | 16 March 2020 Presentation + Paper

A complex dual-modality kidney phantom for renal biopsy studies

Jose Vargas, Phuc Le, Maysam Shahedi, Jeffrey Gahan, Brett Johnson, James Dormer, Sarah Shahub, Matthew Pfefferle, Blake Judson, Yasmeen Alshara, Qinmei Li, Baowei Fei

Proceedings Volume 11319, 113190J (2020) https://doi.org/10.1117/12.2549892

KEYWORDS: Kidney, Ultrasonography, Image segmentation, Biopsy, 3D modeling, Computed tomography, 3D image processing, Tissues, SolidWorks, Standards development

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Proceedings Article | 16 March 2020 Paper

Renal biopsy under augmented reality guidance

Matthew Pfefferle, Sarah Shahub, Maysam Shahedi, Jeffrey Gahan, Brett Johnson, Phuc Le, Jose Vargas, Blake Judson, Yasmeen Alshara, Qinmei Li, Baowei Fei

Proceedings Volume 11315, 113152W (2020) https://doi.org/10.1117/12.2550593

KEYWORDS: Ultrasonography, Image registration, Biopsy, Augmented reality, Computed tomography, 3D image processing, Kidney, Image segmentation, Magnetic tracking, Holograms

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Proceedings Article | 1 March 2017 Paper

Integrative analysis on histopathological image for identifying cellular heterogeneity

Young Hwan Chang, Guillaume Thibault, Brett Johnson, Adam Margolin, Joe Gray

Proceedings Volume 10140, 101400T (2017) https://doi.org/10.1117/12.2250428

KEYWORDS: Image processing, Image segmentation, Tissues, Image analysis, Tumors, Analytical research, Biological research, Statistical analysis, Medical imaging, Computer simulations

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Showing 5 of 11 publications

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