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European Journal of Nuclear Medicine and Molecular Imaging

Erschienen in:

01.02.2021 | Original Article

Artificial intelligence enables whole-body positron emission tomography scans with minimal radiation exposure

verfasst von: Yan-Ran (Joyce) Wang, Lucia Baratto, K. Elizabeth Hawk, Ashok J. Theruvath, Allison Pribnow, Avnesh S. Thakor, Sergios Gatidis, Rong Lu, Santosh E. Gummidipundi, Jordi Garcia-Diaz, Daniel Rubin, Heike E. Daldrup-Link

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 9/2021

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Abstract

Purpose

To generate diagnostic ¹⁸F-FDG PET images of pediatric cancer patients from ultra-low-dose ¹⁸F-FDG PET input images, using a novel artificial intelligence (AI) algorithm.

Methods

We used whole-body ¹⁸F-FDG-PET/MRI scans of 33 children and young adults with lymphoma (3–30 years) to develop a convolutional neural network (CNN), which combines inputs from simulated 6.25% ultra-low-dose ¹⁸F-FDG PET scans and simultaneously acquired MRI scans to produce a standard-dose ¹⁸F-FDG PET scan. The image quality of ultra-low-dose PET scans, AI-augmented PET scans, and clinical standard PET scans was evaluated by traditional metrics in computer vision and by expert radiologists and nuclear medicine physicians, using Wilcoxon signed-rank tests and weighted kappa statistics.

Results

The peak signal-to-noise ratio and structural similarity index were significantly higher, and the normalized root-mean-square error was significantly lower on the AI-reconstructed PET images compared to simulated 6.25% dose images (p < 0.001). Compared to the ground-truth standard-dose PET, SUV_max values of tumors and reference tissues were significantly higher on the simulated 6.25% ultra-low-dose PET scans as a result of image noise. After the CNN augmentation, the SUV_max values were recovered to values similar to the standard-dose PET. Quantitative measures of the readers’ diagnostic confidence demonstrated significantly higher agreement between standard clinical scans and AI-reconstructed PET scans (kappa = 0.942) than 6.25% dose scans (kappa = 0.650).

Conclusions

Our CNN model could generate simulated clinical standard ¹⁸F-FDG PET images from ultra-low-dose inputs, while maintaining clinically relevant information in terms of diagnostic accuracy and quantitative SUV measurements.

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Titel: Artificial intelligence enables whole-body positron emission tomography scans with minimal radiation exposure
verfasst von: Yan-Ran (Joyce) Wang
Lucia Baratto
K. Elizabeth Hawk
Ashok J. Theruvath
Allison Pribnow
Avnesh S. Thakor
Sergios Gatidis
Rong Lu
Santosh E. Gummidipundi
Jordi Garcia-Diaz
Daniel Rubin
Heike E. Daldrup-Link
Publikationsdatum: 01.02.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 9/2021
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-021-05197-3

Springer Medizin

Abstract

Purpose

Methods

Results

Conclusions

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