Publications by authors named "Koichi Okuda"

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Establishment of a I-meta-iodobenzylguanidine normal database for D-SPECT using Japanese and Italian data.
Xue Zhang, Kenichi Nakajima, Wanda Acampa, Roberta Assante, Adriana D'Antonio, Koichi Okuda

Ann Nucl Med· September 2025

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Detectability of cold tumors by xSPECT bone technology compared with hot tumors: a supine phantom study.
Takayuki Shibutani, Takahiro Konishi, Hajime Ichikawa, Masahisa Onoguchi, Hiroto Yoneyama, Koichi Okuda

Phys Eng Sci Med· March 2024

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Comparison of Taiwanese and European Calibration Factors for Heart-to-Mediastinum Ratio in Multicenter I-mIBG Phantom Studies.
Koichi Okuda, Kenichi Nakajima, Guang-Uei Hung, Hao-Ting Wu, Derk O Verschure

Ann Nucl Cardiol· October 2023

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Phantom-Based Standardization Method for I-metaiodobenzylguanidine Heart-to-Mediastinum Ratio Validated by D-SPECT Versus Anger Camera.
Shozo Yamashita, Kenichi Nakajima, Koichi Okuda, Haruki Yamamoto, Takayuki Shibutani

Ann Nucl Cardiol· October 2023

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Machine learning-based prediction of conversion coefficients for I-123 metaiodobenzylguanidine heart-to-mediastinum ratio.
Koichi Okuda, Kenichi Nakajima, Chiemi Kitamura, Michael Ljungberg, Tetsuo Hosoya

J Nucl Cardiol· August 2023

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[Trends and Future Prospects of AI Technology Utilization Research in JSRT　 -Challenges to Tackle and the Expected Role of Our Academic Society !?].
Ikuo Kawashita, Norio Hayashi, Masahide Tominaga, Toshioh Fujibuchi, Taiki Magome, Koichi Okuda

Nihon Hoshasen Gijutsu Gakkai Zasshi· August 2023

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Feasibility of using counts-per-volume approach with a new SPECT phantom to optimize the relationship between administered dose and acquisition time.
Hajime Ichikawa, Takayuki Shibutani, Hideki Shimada, Koichi Okuda, Toyohiro Kato

Radiol Phys Technol· June 2023

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Modified signal-to-noise ratio in the liver using the background-to-lung activity ratio to assess image quality of whole-body F-fluorodeoxyglucose positron emission tomography.
Shozo Yamashita, Koichi Okuda, Tetsu Nakaichi, Haruki Yamamoto, Tatsuya Yoneyama

Radiol Phys Technol· March 2023

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[[Nuclear Medicine] 6. Digital Phantoms for Nuclear Medicine].
Koichi Okuda

Nihon Hoshasen Gijutsu Gakkai Zasshi· August 2022

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Should Artifacts of the Inferior Wall Be Reduced Using Image Processing?
Koichi Okuda, Kenichi Nakajima, Takayuki Shibutani

Ann Nucl Cardiol· August 2022

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Clinical Validation of Japanese Normal Myocardial Perfusion Imaging Databases Using Semi-conductor Gamma Camera (D-SPECT): Japanese Society of Nuclear Cardiology Working Group Reports.
Naoya Matsumoto, Shonosuke Sugai, Yasuyuki Suzuki, Nobuo Iguchi, Mamoru Nanasato, Koichi Okuda

Ann Nucl Cardiol· August 2022

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Normal and Range Value Evaluations Using Heart Risk View-Function Based on the Japanese Societyof Nuclear Medicine Working Group Database.
Kosuke Tatsuno, Koichi Okuda, Kenichi Nakajima, Hisahiro Saito, Takayuki Shibutani

Ann Nucl Cardiol· August 2022

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Beads phantom for evaluating heterogeneity of SUV on F-FDG PET images.
Koichi Okuda, Hisahiro Saito, Shozo Yamashita, Haruki Yamamoto, Hajime Ichikawa

Ann Nucl Med· May 2022

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The utility of heart-to-mediastinum ratio using a planar image created from IQ-SPECT with Iodine-123 meta-iodobenzylguanidine.
Takayuki Shibutani, Kenichi Nakajima, Hiroto Yoneyama, Takahiro Konishi, Koichi Okuda

J Nucl Cardiol· December 2021

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Verification of phantom accuracy using a Monte Carlo simulation: bone scintigraphy chest phantom.
Toshimune Ito, Hirotatsu Tsuchikame, Hajime Ichikawa, Masahisa Onoguchi, Koichi Okuda

Radiol Phys Technol· September 2021

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Comparison of Myocardial Ischemia Detection Between Semiconductor and Conventional Anger-type Three-detector SPECT.
Hiroto Yoneyama, Kenichi Nakajima, Junichi Taki, Hiroshi Wakabayashi, Takahiro Konishi, Koichi Okuda

Ann Nucl Cardiol· August 2021

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Texture Feature Comparison Between Step-and-Shoot and Continuous-Bed-Motion F-FDG PET.
Shozo Yamashita, Koichi Okuda, Tetsu Nakaichi, Haruki Yamamoto, Kunihiko Yokoyama

J Nucl Med Technol· March 2021

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Metal artifact reduction for improving quantitative SPECT/CT imaging.
Takahiro Konishi, Takayuki Shibutani, Koichi Okuda, Hiroto Yoneyama, Riku Moribe

Ann Nucl Med· March 2021

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Experimental evaluation of the GE NM/CT 870 CZT clinical SPECT system equipped with WEHR and MEHRS collimator.
Toshimune Ito, Yohji Matsusaka, Masahisa Onoguchi, Hajime Ichikawa, Koichi Okuda

J Appl Clin Med Phys· February 2021

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[Validation of Simulation Codes for Nuclear Imaging Using Digital Phantoms].
Koichi Okuda, Hiroki Nosaka, Toshimune Ito, Norikazu Matsutomo, Hajime Ichikawa

Nihon Hoshasen Gijutsu Gakkai Zasshi· January 2021

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Current state of oncologic F-FDG PET/CT in Japan: A nationwide survey.
Hajime Ichikawa, Toyohiro Kato, Kenta Miwa, Takayuki Shibutani, Koichi Okuda

Asia Ocean J Nucl Med Biol· January 2021

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Calibrated scintigraphic imaging procedures improve quantitative assessment of the cardiac sympathetic nerve activity.
Koichi Okuda, Kenichi Nakajima, Chiemi Kitamura, Yumiko Kirihara, Mitsumasa Hashimoto

Sci Rep· December 2020

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[A Nationwide Survey on Additional Scan in Nuclear Medicine Imaging].
Toyohiro Kato, Hajime Ichikawa, Kenta Miwa, Koichi Okuda, Takayuki Shibutani

Nihon Hoshasen Gijutsu Gakkai Zasshi· September 2020

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Serial examination of cardiac function and perfusion in growing rats using SPECT/CT for small animals.
Tomo Hiromasa, Junichi Taki, Hiroshi Wakabayashi, Anri Inaki, Koichi Okuda

Sci Rep· January 2020

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Current state of bone scintigraphy protocols and practice in Japan.
Hajime Ichikawa, Kenta Miwa, Koichi Okuda, Takayuki Shibutani, Toyohiro Kato

Asia Ocean J Nucl Med Biol· January 2020

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