Comparison of threshold-based and watershed-based segmentation for the truncation compensation of PET/MR images

Thomas Blaffert; Steffen Renisch; Jing Tang; Manoj Narayanan; Zhiqiang Hu

doi:10.1117/12.911221

14 February 2012 Comparison of threshold-based and watershed-based segmentation for the truncation compensation of PET/MR images

Thomas Blaffert, Steffen Renisch, Jing Tang, Manoj Narayanan, Zhiqiang Hu

Author Affiliations +

Proceedings Volume 8314, Medical Imaging 2012: Image Processing; 831403 (2012) https://doi.org/10.1117/12.911221
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

Recently introduced combined PET/MR scanners need to handle the specific problem that a limited MR field of view sometimes truncates arm or body contours, which prevents an accurate calculation of PET attenuation correction maps. Such maps of attenuation coefficients over body structures are required for a quantitatively correct PET image reconstruction. This paper addresses this problem by presenting a method that segments a preliminary reconstruction type of PET images, time of flight non-attenuation corrected (ToF-NAC) images, and outlining a processing pipeline that compensates the arm or body truncation with this segmentation. The impact of this truncation compensation is demonstrated together with a comparison of two segmentation methods, simple gray value threshold segmentation and a watershed algorithm on a gradient image. Our results indicate that with truncation compensation a clinically tolerable quantitative SUV error is robustly achievable.

Citation Download Citation

Thomas Blaffert, Steffen Renisch, Jing Tang, Manoj Narayanan, and Zhiqiang Hu "Comparison of threshold-based and watershed-based segmentation for the truncation compensation of PET/MR images", Proc. SPIE 8314, Medical Imaging 2012: Image Processing, 831403 (14 February 2012); https://doi.org/10.1117/12.911221

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