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Fully parametric imaging with reversible tracer 18F-FLT within a reasonable time

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Abstract

PET enables quantitative imaging of the rate constants K 1, k 2, k 3, and k 4, with a reversible two tissue compartment model (2TCM). A new method is proposed for computing all of these rates within a reasonable time, less than 1 min. A set of differential equations for the reversible 2TCM was converted into a single formula consisting of differential and convolution terms. The validity was tested on clinical data with 18F-FLT PET for patients with glioma (n = 39). Parametric images were generated with the formula that was developed. Parametric values were extracted from regions of interest (ROIs) for glioma from the images generated, and they were compared with those obtained with the non-linear fitting method. We performed simulation studies for testing accuracy by generating simulated images, assuming clinically expected ranges of the parametric values. The computation time was about 20 s, and the quality of the images generated was acceptable. The values obtained for K 1 for grade IV tumor were 0.24 ± 0.23 and 0.26 ± 0.25 ml−1 min−1 g−1 for the image-based and ROI-based methods, respectively. The values were 0.21 ± 0.12 and 0.21 ± 0.12 min−1 for k 2, 0.13 ± 0.07 and 0.13 ± 0.07 min−1 for k 3, and 0.052 ± 0.020 and 0.054 ± 0.021 min−1 for k 4. The differences between the methods were not significant. Regression analysis showed correlations of r = 0.94, 0.86, 0.71, and 0.52 for these parameters. Simulation demonstrated that the accuracy was within acceptable ranges, namely, the correlations were r = 0.99, r = 0.97, r = 0.99, and r = 0.91 for K 1, k 2, k 3, and k 4, respectively, between estimated and assumed values. This results suggest that parametric images can be obtained fully within reasonable time, accuracy, and quality.

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Acknowledgments

The authors thank Dr. Akihiro Nishiyama for helping us in developing and checking the formula in this study, and the staff of the Department of Radiology, Kagawa University Hospital. This study by NK, YY, and YN was supported by the Ministry of Education, Science, Sports and Culture of Japan, a grant-in-aid for JSPS KAKENHI (C) (Grant Number 26460728 2014–2016).

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Authors and Affiliations

  1. Department of Medical Physics, Faculty of Medicine, Kagawa University, Mikicho, Kagawa, 761-0793, Japan

    Nobuyuki Kudomi

  2. Department of Radiology, Kagawa University Hospital, Mikicho, Kagawa, 761-0793, Japan

    Yukito Maeda

  3. Department of Neurological Surgery, Faculty of Medicine, Kagawa University, Mikicho, Kagawa, 761-0793, Japan

    Tetsuhiro Hatakeyama

  4. Department of Radiology, Faculty of Medicine, Kagawa University, Mikicho, Kagawa, 761-0793, Japan

    Yuka Yamamoto & Yoshihiro Nishiyama

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  1. Nobuyuki Kudomi
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  2. Yukito Maeda
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  3. Tetsuhiro Hatakeyama
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  4. Yuka Yamamoto
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  5. Yoshihiro Nishiyama
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Correspondence to Nobuyuki Kudomi.

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Kudomi, N., Maeda, Y., Hatakeyama, T. et al. Fully parametric imaging with reversible tracer 18F-FLT within a reasonable time. Radiol Phys Technol 10, 41–48 (2017). https://doi.org/10.1007/s12194-016-0367-0

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  • DOI: https://doi.org/10.1007/s12194-016-0367-0

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