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Journal Articles

Quantification of radicals in aqueous solution by positronium lifetime; An Experiment using a clinical PET scanner

Takyu, Sodai*; Matsumoto, Kenichiro*; Hirade, Tetsuya; Nishikido, Fumihiko*; Akamatsu, Go*; Tashima, Hideaki*; Takahashi, Miwako*; Yamaya, Taiga*

Japanese Journal of Applied Physics, 63(8), p.086003_1 - 086003_8, 2024/08

 Times Cited Count:1 Percentile:40.97(Physics, Applied)

Positrons and electrons sometimes exist as a bound state, positronium (Ps), in living organisms. The triplet Ps (ortho-Ps) annihilation time represents the ortho-Ps pick-off annihilation lifetime, and it varies depending on the surrounding electron density. The ortho-Ps lifetime may add new biological information to PET scan information. In order to discuss the feasibility of quantifying (free) radicals in vivo by the ortho-Ps lifetime, we used a clinical PET system to make ortho-Ps lifetime measurements in aqueous solutions containing radicals. The results suggested that differences in radical concentrations in aqueous solutions of the order of a few mM could be quantified by the ortho-Ps lifetime if the counting statistic of the positron annihilation events was more than 10$$^{8}$$ events. This concentration was higher than the radical concentration generated in the physiological functions of living organisms.

Journal Articles

Application of OpenPET as 3-D imaging device of carbon distribution in fruit

Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

QST-M-29; QST Takasaki Annual Report 2019, P. 106, 2021/03

Oral presentation

Strawberry seeds drive carbon translocation to the fruit

Miyoshi, Yuta*; Kurita, Keisuke; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effects of the presence or absence of strawberry seeds on the translocation of photosynthetic products to fruits

Miyoshi, Yuta*; Kurita, Keisuke; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

no journal, , 

no abstracts in English

Oral presentation

Feasibility of positron lifetime imaging analysis using gamma ray beam

Takyu, Sodai*; Taira, Yoshitaka*; Hirade, Tetsuya; Nishikido, Fumihiko*; Kang, H. G.*; Tashima, Hideaki*; Obata, Fujino*; Matsumoto, Kenichiro*; Takahashi, Miwako*; Yamaya, Taiga*

no journal, , 

no abstracts in English

Oral presentation

Quantum PET; Positron lifetime measurement for biomedical engineering applications

Takyu, Sodai*; Matsumoto, Kenichiro*; Hirade, Tetsuya; Nishikido, Fumihiko*; Akamatsu, Go*; Tashima, Hideaki*; Takahashi, Miwako*; Yamaya, Taiga*

no journal, , 

no abstracts in English

Oral presentation

3-D imaging of photoassimilate in fruit using OpenPET

Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

no journal, , 

no abstracts in English

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