Light intensity matching between different intravascular optical coherence tomography systems

Shengnan Liu; Jeroen Eggermont; Shimpei Nakatani M.D.; Boudewijn P. F. Lelieveldt; Jouke Dijkstra

doi:10.1117/12.2209311

29 February 2016 Light intensity matching between different intravascular optical coherence tomography systems

Shengnan Liu, Jeroen Eggermont, Shimpei Nakatani M.D., Boudewijn P. F. Lelieveldt, Jouke Dijkstra

Proceedings Volume 9689, Photonic Therapeutics and Diagnostics XII; 96893D (2016) https://doi.org/10.1117/12.2209311
Event: SPIE BiOS, 2016, San Francisco, California, United States

Abstract

Currently two commercial intravascular optical coherence tomography (IVOCT) systems are available: Illumien Optis from St. Jude Medical (SJM) and Lunawave from Terumo. Both systems store the light intensity data in a raw vendor specific polar format. However, whereas SJM uses 16-bits per pixel Terumo uses 8-bits meaning the intensity values are in different ranges. This complicates quantitative light intensity based analysis when comparing results based on data from both systems. Therefore, this work aims to find an intensity transformation function from Terumo’s 8-bit OFDI data to SJM’s 16-bit range. The data consists of 8 pullbacks, 4 acquired with each system in the same arteries of 2 different patents pre- and post-stenting implantation. A total of 133 matching sections without stent struts from the two sets of pullbacks were identified based on landmarks such as side-branches and calcified regions. Since the main region of interest in the image is the tissue region only the pixels within 2mm behind the lumen border are used. In order to match the SJM data range, the Terumo data was rescaled and cumulative distribution functions (CDF) were calculated based on the histogram distributions. Comparing these CDFs, the transformation function can be determined. Application of this transformation function not only improves the visual similarity of matching slices it can also be used for further quantitative analysis.

Conference Presentation

Citation Download Citation

Shengnan Liu, Jeroen Eggermont, Shimpei Nakatani M.D., Boudewijn P. F. Lelieveldt, and Jouke Dijkstra "Light intensity matching between different intravascular optical coherence tomography systems", Proc. SPIE 9689, Photonic Therapeutics and Diagnostics XII, 96893D (29 February 2016); https://doi.org/10.1117/12.2209311

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