TOMOGRAPHIC IMAGE CREATION DEVICE, TOMOGRAPHIC IMAGE CREATION METHOD, AND TOF-PET DEVICE

WIPO Patent Application WO/2023/026958

A1

A tomographic image creation device 10 comprises a time difference calculation unit 12, a signal waveform processing unit 13, an error estimation unit 14, a γ-ray pair generation position calculation unit 15, an image creation unit 16, etc. The time difference calculation unit 12 obtains, for each of multiple γ-ray pair coincidence events, the time difference tled between timings at which respective values of a first signal and a second signal that have been output from a signal waveform acquisition unit 11 reach a threshold. The signal waveform processing unit 13 relatively shifts the waveform of the first signal or the waveform of the second signal by the time difference tled in a direction in which the waveform of the first signal and the waveform of the second signal approach each other in the time axis direction. The error estimation unit 14 uses a DNN to estimate, on the respective shifted waveforms of the first signal and the second signal, an error terr included in the time difference tled. This makes it possible to provide a tomographic image creation device that uses a DNN to create a tomographic image of a subject on the basis of multiple pieces of γ-ray pair coincidence event information acquired by a PET detector, wherein the tomographic image creation device enables easy training of the DNN.

ONISHI YUYA (JP)
OTA RYOSUKE (JP)
HASHIMOTO FUMIO (JP)
OTE KIBO (JP)

PCT/JP2022/031259

March 02, 2023

August 18, 2022

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HAMAMATSU PHOTONICS KK (JP)

G01T1/161

CN111012372A	2020-04-17
JP2021110737A	2021-08-02
JP2008051701A	2008-03-06
US20130032706A1	2013-02-07
US20060145082A1	2006-07-06

HASEGAWA Yoshiki et al. (JP)

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