Kenichiro Okumura

ORCID: 0000-0001-8131-7584
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Advanced Fiber Laser Technologies
  • Spectroscopy and Laser Applications
  • Photonic and Optical Devices
  • Advanced X-ray and CT Imaging
  • Medical Imaging Techniques and Applications
  • Radiation Dose and Imaging
  • Semiconductor Lasers and Optical Devices
  • Advanced Frequency and Time Standards
  • Hepatocellular Carcinoma Treatment and Prognosis
  • MRI in cancer diagnosis
  • Gallbladder and Bile Duct Disorders
  • Photoacoustic and Ultrasonic Imaging
  • Liver Disease and Transplantation
  • Optical Imaging and Spectroscopy Techniques
  • Optical Network Technologies
  • Analytical Chemistry and Sensors
  • Aortic aneurysm repair treatments
  • Liver Disease Diagnosis and Treatment
  • Vascular Procedures and Complications
  • Nanoplatforms for cancer theranostics
  • Cholangiocarcinoma and Gallbladder Cancer Studies
  • Cold Atom Physics and Bose-Einstein Condensates
  • Pediatric Hepatobiliary Diseases and Treatments
  • Renal cell carcinoma treatment
  • Advanced Measurement and Metrology Techniques

Kanazawa University
1991-2025

Chiba University Hospital
2010-2024

Fukui Prefectural Hospital
2024

Kanazawa Medical University
2018-2021

Chiba University
2015

Fukui-ken Saiseikai Hospital
2012-2014

National Institute of Advanced Industrial Science and Technology
2002-2007

Geological Survey of Japan
2002

National Institute of Metrology
1998

Palo Alto Research Center
1991

Immunoglobulin G4-related disease (IgG4-RD) is a recently discovered systemic condition, in which various organ manifestations are linked by similar histological appearance. Our knowledge of this condition still fragmented, as most studies have examined only few dozen patients or focused on particular manifestation. This study was conducted to learn the demography and patient characteristics IgG4-RD using large cohort. A total 235 consecutive with IgG4-RD, diagnosed 8 general hospitals same...

10.1097/md.0000000000000680 article EN cc-by-nc Medicine 2015-04-01

<title>Abstract</title> <bold>Purpose: </bold>This study examined whether sharp vessel angulation (≥90–180°) and microcatheter–detachable coil compatibility independently increase maldelivery in non-neuro arterial embolization, how these factors affect technical failure salvage strategies.<bold> </bold> <bold>Materials Methods: </bold>A single-center, IRB-approved analysis from February 2023 to December 2024 included 451 branch–detachable combinations (BCCs) 119 patients (mean age 64 years,...

10.21203/rs.3.rs-6256551/v1 preprint EN Research Square (Research Square) 2025-04-03

New types of bistable optical devices consisting merely laser diodes and/or light-emitting diode and photodetectors allow one to achieve bistability differential gain. For their novel applications, fundamental logic functions such as an AND device, inverter, flip-flop are analyzed demonstrated experimentally for the first time. The inherent simplicity structure operation should make it possible establish these digital in form monolithic optoelectronic integration. Some schemes integrated...

10.1109/jqe.1985.1072662 article EN IEEE Journal of Quantum Electronics 1985-04-01

We have made a frequency standard operating at the 1.5 /spl mu/m region using saturated absorption of v/sub 1/+v/sub 3/ band /sup 13/C/sub 2/H/sub 2/. To enhance moderate power from laser diode and to saturate very weak molecular overtone transition, we used Fabry-Perot (FP) cavity inside it put an acetylene cell. In order obtain longer life time for cell, designed new scheme consisting with ULE (ultralow expansion) glass spacer baked sealed-off cell Brewster windows. observed spectrum...

10.1109/19.769658 article EN IEEE Transactions on Instrumentation and Measurement 1999-04-01

We analysed the haemodynamics of indocyanine green (ICG) in mouse organs and tumours evaluated responses to anti-angiogenic agents an allograft tumour model by photoacoustic imaging.Thirty-six male mice (aged 10-14 weeks; body weight 20-25 g) were used. Real-time imaging after intravenous injection ICG was conducted until 10 min injection. distribution tissues assessed immunohistochemical staining observation ICG-derived fluorescence. Vascular permeability changes induced vascular...

10.1186/s41747-018-0036-7 article EN cc-by European Radiology Experimental 2018-02-27

To evaluate the utility of photoacoustic imaging in measuring changes renal oxygen saturation after ischemia-induced acute kidney injury, and to compare these measurements with histological findings serum levels function.Acute injury was induced by clamping left pedicle C57Bl/6 mice, a 35-min ischemic period used induce mild (14 mice) 50-min for severe (13 mice). The measured before induction, at 5 time-points over first 48 h starting 4 induction. Oxygen saturation, score, volume, 24...

10.1371/journal.pone.0206461 article EN cc-by PLoS ONE 2018-12-17

Liver function influences the plasma antithrombin (AT)-III levels. AT-III is beneficial for patients with portal vein thrombosis (PVT) and low However, whether these levels affect prognosis in cirrhosis-associated PVT remains unknown. This retrospective study involved 75 cirrhosis treated danaparoid sodium or without AT-III. The level was significantly lower liver failure-related death than those hepatocellular carcinoma (HCC)-related (p = 0.005), although Child-Pugh albumin-bilirubin (ALBI)...

10.3390/ijms24097732 article EN International Journal of Molecular Sciences 2023-04-23

Portal vein thrombosis (PVT) is a common complication of cirrhosis. However, in patients with PVT and cirrhosis, there no clear evidence supporting effective treatment modalities. In this study, we examined the effectiveness safety anticoagulation therapy using danaparoid sodium for cirrhosis.This retrospective study assessed 52 cirrhotic treated 2 weeks between November 2008 September 2018. The primary outcome measure was post-treatment status by reduction thrombus volume therapeutic...

10.1186/s12876-019-1140-8 article EN cc-by BMC Gastroenterology 2019-12-01

Abstract This paper presents the results of numerical modelling to investigate regional occurrence prehnite‐bearing metamorphic rocks at shallow levels in subduction zones. The assumes a simple geometrical configuration which thermal structure prism is controlled by boundary conditions top and base prism. It expected that predominant facies will change with decreasing age descending slab. show between pumpellyite–actinolite prehnite–actinolite (including prehnite–pumpellyite facies) overlaps...

10.1046/j.1525-1314.2002.00380.x article EN Journal of Metamorphic Geology 2002-05-01

Main bile duct necrosis develops after transcatheter arterial chemoembolization (TACE) through the caudate artery (A1) and medial subsegmental (A4) of hepatic in treatment hepatocellular carcinoma. The aim this study was to evaluate branch (BD branch) from A1 A4.We evaluated origin vascular territory BD 11 patients who underwent selective and/or A4 arteriography using arteriograms, cone-beam computed tomography (CBCT) CT obtained 1 week TACE. Follow-up magnetic resonance imaging were also...

10.1111/hepr.12071 article EN Hepatology Research 2013-01-14

Absolute frequency measurements of the R(85)33–0 transition molecular iodine at blue end tuning range a frequency-doubled Nd:YAG laser are implemented with femtosecond optical comb based on mode-locked Ti:sapphire laser. The hyperfine structure is observed by use high-resolution spectroscopy and measured comb. transitions good references for both Nd:YVO4 lasers in 532-nm region. High-accuracy constants obtained our fitting splittings to four-term Hamiltonian, which includes electric...

10.1364/josab.21.000088 article EN Journal of the Optical Society of America B 2004-01-01

Abstract We constructed a sparse-view computed tomography (CT) system that combines compressed sensing (CS)-based image-reconstruction algorithm and SiPM-based photon-counting (PC) CT. CS-based algorithms have been extensively studied for X-ray CT image reconstruction using fewer projections because they are expected to reduce imaging time radiation exposure while maintaining quality. In most previous studies, applied data obtained through numerical simulations or conventional dual-energy...

10.1088/1748-0221/19/02/c02010 article EN Journal of Instrumentation 2024-02-01

This study examines periductal infiltration in intrahepatic mass-forming cholangiocarcinoma (IMCC), focusing on its importance for differentiating hepatic tumors and influence post-surgical survival IMCC patients.

10.1016/j.ejro.2024.100554 article EN cc-by-nc-nd European Journal of Radiology Open 2024-02-16
Coming Soon ...