R Hirayama
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Explore the profile of R Hirayama including associated specialties, affiliations and a list of published articles.
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Articles
65
Citations
526
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Recent Articles
1.
Gonzalez-Vegas R, Seksek O, Bertho A, Bergs J, Hirayama R, Inaniwa T, et al.
Analyst
. 2024 Dec;
150(2):342-352.
PMID: 39668677
Radioresistant tumours remain complex to manage with current radiotherapy (RT) techniques. Heavy ion beams were proposed for their treatment given their advantageous radiobiological properties. However, previous studies with patients resulted...
2.
Ito A, Kitabatake S, Furuichi W, Takase N, Nakahara T, Akiyama T, et al.
Radiat Res
. 2024 Jan;
201(3):189-196.
PMID: 38294870
One of the most distinguished features in biological effects of heavy ions would be the decrease of oxygen effect in the high-LET region. This feature has been referred to as...
3.
Furusawa Y, Matsumoto Y, Hirayama R, Ohsawa D, Konishi T
Radiat Prot Dosimetry
. 2018 Dec;
183(1-2):219-222.
PMID: 30566666
It is believed that the dose-rate of radiation will have an influence on cell sensitivity. The dose-rate effects on cell survival can be expressed by the change of the β...
4.
Bopp C, Hirayama R, Inaniwa T, Kitagawa A, Matsufuji N, Noda K
Phys Med Biol
. 2016 Oct;
61(21):7586-7599.
PMID: 27716637
Ion beams present a potential advantage in terms of treatment of lesions with hypoxic regions. In order to use this potential, it is important to accurately model the cell survival...
5.
Masunaga S, Sakurai Y, Tanaka H, Hirayama R, Matsumoto Y, Uzawa A, et al.
Br J Radiol
. 2012 Dec;
86(1021):20120302.
PMID: 23255546
Objectives: To detect the radiosensitivity of intratumour quiescent (Q) cells unlabelled with pimonidazole to accelerated carbon ion beams and the boron neutron capture reaction (BNCR). Methods: EL4 tumour-bearing C57BL/J mice...
6.
Hirayama R, Uzawa A, Matsumoto Y, Noguchi M, Kase Y, Takase N, et al.
Radiat Prot Dosimetry
. 2010 Dec;
143(2-4):508-12.
PMID: 21148587
We studied double-strand breaks (DSB) induction and rejoining in clamped and non-clamped transplanted tumours in mice leg after exposure to 80 keV µm(-1) carbon ions and X rays. The yields...
7.
Masunaga S, Matsumoto Y, Kashino G, Hirayama R, Liu Y, Tanaka H, et al.
Br J Radiol
. 2010 Aug;
83(993):776-84.
PMID: 20739345
The purpose of this study was to evaluate the influence of manipulating intratumour oxygenation status and radiation dose rate on local tumour response and lung metastases following radiotherapy, referring to...
8.
Suzuki R, Watanabe T, Hirayama R, Nohata I, Ito K, Baba Y, et al.
Kyobu Geka
. 2008 Jun;
61(6):456-9.
PMID: 18536292
We report a case of cardiac myxoma causing cerebral metastasis after cardiac tumor resection. A 68-year-old man with a cerebral infarction was admitted to our hospital. A cardioembolic source was...
9.
Hikosaka Y, Aoto T, Ito K, Terasaka Y, Hirayama R, Miyoshi E
J Chem Phys
. 2008 Feb;
128(4):044320.
PMID: 18247962
The NO(+) states lying in the ionization region of 20-40 eV have been investigated by high-resolution threshold photoelectron spectroscopy and a configuration interaction calculation. Substantial agreement between the structures on...
10.
Ichikawa W, Takahashi T, Suto K, Yamashita T, Nihei Z, Shirota Y, et al.
Br J Cancer
. 2004 Sep;
91(7):1245-50.
PMID: 15354215
The predictive values of thymidylate synthase (TS) and dihydropyrimidine dehydrogenase (DPD) gene expressions were retrospectively evaluated in patients with gastric cancer treated by a regimen containing S-1. The study population...