Calibrated scintigraphic imaging procedures improve quantitative assessment of the cardiac sympathetic nerve activity, Koichi Okuda, Kenichi Nakajima, Chiemi Kitamura, Yumiko Kirihara, Mitsumasa Hashimoto, Seigo Kinuya, Scientific reports, 10:21834, Dec. 2020
Current state of bone scintigraphy protocols and practice in Japan, (Hajime Ichikawa), Kenta Miwa, Koichi Okuda, Takayuki Shibutani, Toyohiro Kato, Akio Nagaki, Hiroyuki Tsushima, Masahisa Onoguchi, Asia Oceania journal of nuclear medicine & biology, 8:116-122, Apr. 2020
Has the era of dual-gated myocardial perfusion SPECT and PET arrived?, Koichi Okuda, Kenichi Nakajima, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 27:648-650, Apr. 2020
Imaging technology for myocardial perfusion single-photon emission computed tomography 2018 in Japan, (Takayuki Shibutani), Koichi Okuda, Hajime Ichikawa, Toyohiro Kato, Kenta Miwa, Hiroyuki Tsushima, Masahisa Onoguchi, Akio Nagaki, Japanese journal of radiology, 38:274-282, Mar. 2020
Study of novel deformable image registration in myocardial perfusion single-photon emission computed tomography, (Ito T), Onoguchi M, Okuda K, Shibutani T, Nuclear Medicine Communications, 41:196-205, Mar. 2020
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, Takayuki Shibutani, Kazuhiro Shiba, Seigo Kinuya, Scientific reports, 10:160, Jan. 2020
Preliminary quantitative evaluation of radiation-induced DNA damage in peripheral blood lymphocytes after cardiac dual-isotope imaging, Koichi Okuda, Naoto Watanabe, Mitsumasa Hashimoto, Mariko Doai, Yasuyuki Kawai, Tomoko Takahashi, Tomohiro Arikawa, Kazumasa Ooiso, Yumi Sunatani, Kuniyoshi Iwabuchi, Koji Kajinami, Munetaka Matoba, Applied Radiation and Isotopes, 154:108890, Dec. 2019
Impact of iterative reconstruction with resolution recovery in myocardial perfusion SPECT: phantom and clinical studies, Koichi Okuda, Kenichi Nakajima, Hiroto Yoneyama, Takayuki Shibutani, Masahisa Onoguchi, Shinro Matsuo, Mitsumasa Hashimoto, Seigo Kinuya, Scientific Reports, 9:19618, Dec. 2019
Nasal thallium-201 uptake in patients with parosmia with and without hyposmia after upper respiratory tract infection, Shiga H, Okuda K, Taki J, Watanabe N, Tonami H, Kinuya S, Miwa T, International forum of allergy & rhinology, 9:1252-1256, Nov. 2019
Demystifying dyssynchrony for diagnosis and prognosis: Tips for measuring heterogeneous phase distribution, (Nakajima Kenichi), Okuda Koichi, Maruyama Koji, Journal of nuclear cardiology, : , Aug. 2019
Prognostic Value of Early Evaluation of Left Ventricular Dyssynchrony After Myocardial Infarction, (Hiroshi Wakabayashi), Junichi Taki, Anri Inaki, Tomo Hiromasa, Takafumi Yamase, Norihito Akatani, Koichi Okuda, Takayuki Shibutani, Kazuhiro Shiba, Seigo Kinuya, Molecular Imaging & Biology, 21:654-659, Aug. 2019
What does entropy reveal in phase analysis of myocardial perfusion SPECT?, Okuda K, Nakajima K., Journal of Nuclear Cardiology, : , Jul. 2019
Deformable Image Registration" New Images Registration of Myocardial Perfusion SPECT, (Ito Toshimune), Onoguchi Masahisa, Okuda Koichi, Shibutani Takayuki, JOURNAL OF NUCLEAR MEDICINE, 60: , May 2019
Ability of artificial intelligence to diagnose coronary artery stenosis using hybrid images of coronary computed tomography angiography and myocardial perfusion SPECT, (Yoneyama H), Kenichi Nakajima, Junichi Taki, Hiroshi Wakabayashi, Shinro Matsuo, Takahiro Konishi, Koichi Okuda, Takayuki Shibutani, Masahisa Onoguchi, Seigo Kinuya, European Journal of Hybrid Imaging, 3:4, Mar. 2019
Making the invisible visible: Phase dyssynchrony has potential as a new prognostic marker, Nakajima Kenichi;Okuda Koichi;Matsuo Shinro;Slomka Piotr, Journal of nuclear cardiology, 26:298-302, Feb. 2019
Accuracy of an artificial neural network for detecting a regional abnormality in myocardial perfusion SPECT, (Shibutani T), Nakajima K, Wakabayashi H, Mori H, Matsuo S, Yoneyama H, Konishi T, Okuda K, Onoguchi M, Kinuya S, Annals of Nuclear Medicine, 33:86-92, Feb. 2019
10. Simulation of Nuclear Medicine Experiments Using ImageJ, Okuda Koichi, Ito Toshimune, Japanese Journal of Radiological Technology, 75:1205-1210, 2019
Phase dyssynchrony and I-123-meta-iodobenzylguanidine innervation imaging towards standardization, (Nakajima Kenichi), Okuda Koichi, Verberne Hein J, JOURNAL OF NUCLEAR CARDIOLOGY, 26:519-523, 2019
A European myocardial (123)I-mIBG cross-calibration phantom study, Verschure Derk O;Poel Edwin;Nakajima Kenichi;Okuda Koichi;van Eck-Smit Berthe L F;Somsen G Aernout;Verberne Hein J, JOURNAL OF NUCLEAR CARDIOLOGY, 25:1191-1197, Aug. 2018
Cross calibration of I-123-meta-iodobenzylguanidine heart-to-mediastinum ratio with D-SPECT planogram and Anger camera, (Nakajima, Kenichi);Okuda, Koichi;Yokoyama, Kunihiko;Yoneyama, Tatsuya;Tsuji, Shiro;Oda, Hiroyuki;Yoshita, Mitsuhiro;Kubota, Koji, ANNALS OF NUCLEAR MEDICINE, 31:605-615, Oct. 2017
Reducing the small-heart effect in pediatric gated myocardial perfusion single-photon emission computed tomography, Yoneyama, Hiroto;Nakajima, Kenichi;Okuda, Koichi;Matsuo, Shinro;Onoguchi, Masahisa;Kinuya, Seigo;Edenbrandt, Lars, JOURNAL OF NUCLEAR CARDIOLOGY, 24:1378-1388, Aug. 2017
Comparison of phase dyssynchrony analysis using gated myocardial perfusion imaging with four software programs: Based on the Japanese Society of Nuclear Medicine working group normal database, (Nakajima, Kenichi);Okuda, Koichi;Matsuo, Shinro;Kiso, Keisuke;Kinuya, Seigo;Garcia, Ernest V., JOURNAL OF NUCLEAR CARDIOLOGY, 24:611-621, Apr. 2017
Comparison of diagnostic performance of four software packages for phase dyssynchrony analysis in gated myocardial perfusion SPECT, Okuda, Koichi;Nakajima, Kenichi;Matsuo, Shinro;Kashiwaya, Soichiro;Yoneyama, Hiroto;Shibutani, Takayuki;Onoguchi, Masahisa;Hashimoto, Mitsumasa;Kinuya, Seigo, EJNMMI RESEARCH, 7:---, Mar. 2017
Prognostic value of olfactory nerve damage measured with thallium-based olfactory imaging in patients with idiopathic olfactory dysfunction., Shiga Hideaki;Taki Junichi;Okuda Koichi;Watanabe Naoto;Tonami Hisao;Nakagawa Hideaki;Kinuya Seigo;Miwa Takaki, Scientific reports, 7:1, 2017
Diagnostic accuracy of an artificial neural network compared with statistical quantitation of myocardial perfusion images: a Japanese multicenter study., (Nakajima Kenichi);Kudo Takashi;Nakata Tomoaki;Kiso Keisuke;Kasai Tokuo;Taniguchi Yasuyo;Matsuo Shinro;Momose Mitsuru;Nakagawa Masayasu;Sarai Masayoshi;Hida Satoshi;Tanaka Hirokazu;Yokoyama Kunihiko;Okuda Koichi;Edenbrandt Lars, European journal of nuclear medicine and molecular imaging, *:2280-2289, 2017
Cardiac and Respiratory Motion-induced Artifact in Myocardial Perfusion SPECT, Okuda Koichi;Nakajima Kenichi;Kikuchi Akihiro;Onoguchi Masahisa;Hashimoto Mitsumasa, Annals of Nuclear Cardiology, 3:88-93, 2017
123I-meta-iodobenzylguanidine Sympathetic Nerve Function Indices Derived from Planar Images, (Kenichi Nakajima), Koichi Okuda, Annals of Nuclear Cardiology, 3:200-202, 2017
Normal Values and Gender Differences of Left Ventricular Functional Parameters with CardioREPO Software, Okuda Koichi;Nakajima Kenichi, Annals of Nuclear Cardiology, 3:29-33, 2017
Phase dyssynchrony and (123)I-meta-iodobenzylguanidine innervation imaging towards standardization., Nakajima Kenichi;Okuda Koichi;Verberne Hein J, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, *:1-5, 2017
Standardization of (123)I-meta-iodobenzylguanidine myocardial sympathetic activity imaging: phantom calibration and clinical applications., Nakajima Kenichi;Verschure Derk O;Okuda Koichi;Verberne Hein J, Clinical and translational imaging, 5:255-263, 2017
IQ-SPECT for thallium-201 myocardial perfusion imaging: effect of normal databases on quantification., Konishi Takahiro;Nakajima Kenichi;Okuda Koichi;Yoneyama Hiroto;Matsuo Shinro;Shibutani Takayuki;Onoguchi Masahisa;Kinuya Seigo, Annals of nuclear medicine, 31:454-461, 2017
Validation of the Left Ventricular Ejection Fraction with the IQ•SPECT System in Small-Heart Patients., Yoneyama Hiroto;Shibutani Takayuki;Konishi Takahiro;Mizutani Asuka;Hashimoto Ryosuke;Onoguchi Masahisa;Okuda Koichi;Matsuo Shinro;Nakajima Kenichi;Kinuya Seigo, Journal of nuclear medicine technology, 45:*, 2017
The time has come to standardize 123I-MIBG heart-to-mediastinum ratios including planar and SPECT methods., (K.Nakajima), K.Okuda, S.Matsuo, D.Agostini, European Journal of Nuclear Medicine and Molecular Imaging, 43:386-388, Feb. 2016
Development and validation of a direct-comparison method for cardiac I-123-metaiodobenzylguanidine washout rates derived from late 3-hour and 4-hour imaging, K.Okuda, K.Nakajima, S.Sugino, Y.Kirihara, S.Matsuo, J.Taki, M.Hashimoto, S.Kinuya, European Journal of Nuclear Medicine and Molecular Imaging, 43:319-325, Feb. 2016
Comparison of phase dyssynchrony analysis using gated myocardial perfusion imaging with four software programs: Based on the Japanese Society of Nuclear Medicine working group normal database., (K.Nakajima), K.Okuda, S.Matsuo, K.Kiso, S.Kinuya, Garcia Ernest V, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 24:1-11, 2016
Normal values and standardization of parameters in nuclear cardiology: Japanese Society of Nuclear Medicine working group database., (K.Nakajima), N.Matsumoto, T.Kasai, S.Matsuo, K.Kiso, K.Okuda, Annals of nuclear medicine, 30:188-199, 2016
Reducing the small-heart effect in pediatric gated myocardial perfusion single-photon emission computed tomography., (H.Yoneyama), K.Nakajima, K.Okuda, S.Matsuo, M.Onoguchi, S.Kinuya, Edenbrandt Lars, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, *:1-11, 2016
Influence of ROI definition on the heart-to-mediastinum ratio in planar (123)I-MIBG imaging., (Klene Christiane), Jungen Christiane, K.Okuda, Y.Kobayashi, Helberg Annabelle, Mester Janos, Meyer Christian, K.Nakajima, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, **:**-**, 2016
Nuclear myocardial perfusion imaging using thallium-201 with a novel multifocal collimator SPECT/CT: IQ-SPECT versus conventional protocols in normal subjects, (S.Matsuo), K.Nakajima, M.Onoguchi, H.Wakabayash, K.Okuda, S.Kinuya, Annals of Nuclear Medicine, 29:452-459, 2015
Diagnostic performance of artificial neural network for detecting ischemia in myocardial perfusion imaging., (K.Nakajima), S.Matsuo, H.Wakabayashi, H.Yokoyama, H.Bunko, K.Okuda, S.Kinuya, K.Nystrom, L.Edenbrandt, Japanese Circulation Journal, 79:1549-1556, 2015
Application of a medium-energy collimator for I-131 imaging after ablation treatment of differentiated thyroid cancer., (Kobayashi M), Wakabayashi H, Kayano D, Konishi T, Kojima H, Yoneyama H, Okuda K, Tsushima H, Onoguchi M, Kawai K, Kinuya S, Ann Nucl Med., 28: 551-8., Jul. 2014
Multicenter cross-calibration of I-123 metaiodobenzylguanidine heart-to-mediastinum ratios to overcome camera-collimator variations, Nakajima, Kenichi;Okuda, Koichi;Yoshimura, Mana;Matsuo, Shinro;Wakabayashi, Hiroshi;Imanishi, Yasuhiro;Kinuya, Seigo, JOURNAL OF NUCLEAR CARDIOLOGY, 21:970-978, Jun. 2014
Optimization of iterative reconstruction parameters with attenuation correction, scatter correction and resolution recovery in myocardial perfusion SPECT/CT., K.Okuda, K.Nakajima, M.Yamada, H.Wakabayashi, H.Ichikawa, H.Arai, S.Matsuo, J.Taki, M.Hashimoto, S.Kinuya, Annals of nuclear medicine., 28:60-68, Jan. 2014
Usefulness of Spatially Adaptive Noise Reduction Processing in Computer-assisted Diagnosis System for Bone Scintigraphy, Ichikawa Hajime;Onoguchi Masahisa;Okuda Koichi;Kato Toyohiro;Terabe Mitsuaki;Shimada Hideki, Jpn. J. Radiol. Technol., 70:461-466, 2014
Prototype imaging protocols for monitoring the efficacy of iodine-131 ablation in differentiated thyroid cancer., (Kobayashi M), Wakabayashi H, Kojima H, Konishi T, Okuda K, Yoneyama H, Kayano D, Tobisaka M, Tsushima H, Onoguchi M, Kawai K, Kinuya S, Hell J Nucl Med., 16: 175-80., Sep. 2013
Improved quantification of small hearts for gated myocardial perfusion imaging., (Nakajima K), Okuda K, Nystrom K, Richter J, Minarik D, Wakabayashi H, Matsuo S, Kinuya S, Edenbrandt L, Eur J Nucl Med Mol Imaging., 40: 1163-70, Apr. 2013
Assessment of olfactory nerve by SPECT-MRI image with nasal thallium-201 administration in patients with olfactory impairments in comparison to healthy volunteers., H.Shiga, J.Taki, K.Washiyama, J.Yamamoto, S.Kinase, K.Okuda, S.Kinuya, N.Watanabe, H.Tonami, K.Koshida, R.Amano, M.Furukawa, T.Miwa, PloS one, 8:e57671;1-8, Feb. 2013
Assessment of olfactory nerve by SPECT-MRI image with nasal thallium-201 administration in patients with olfactory impairments in comparison to healthy volunteers., H.Shiga, J.Taki, K.Washiyama, J.Yamamoto, S.Kinase, K.Okuda, S.Kinuya, N.Watanabe, H.Tonami, K.Koshida, R.Amano, M.Furukawa, T.Miwa, PloS one, 8:e57671;1-8, Feb. 2013
Improved quantification of small hearts for gated myocardial perfusion imaging., Nakajima K, Okuda K, Nyström K, Richter J, Minarik D, Wakabayashi H, Matsuo S, Kinuya S, Edenbrandt L, 40:1163-1170, 2013
Assessment of olfactory nerve by SPECT-MRI image with nasal thallium-201 administration in patients with olfactory impairments in comparison to healthy volunteers., Shiga H, Taki J, Washiyama K, Yamamoto J, Kinase S, Okuda K, Kinuya S, Watanabe N, Tonami H, Koshida K, Amano R, Furukawa M, Miwa T, 8:e57671, 2013
Standardization of metaiodobenzylguanidine heart to mediastinum ratio using a calibration phantom: effects of correction on normal databases and a multicentre study., Nakajima K, Okuda K, Matsuo S, Taki J, Yamada M, Kinuya S., European journal of nuclear medicine and molecular imaging., 39: 113-9., Jan. 2012
Cause of apical thinning on attenuation-corrected myocardial perfusion SPECT., Okuda K, Nakajima K, Matsuo S, Wakabayashi H, Taki J, Kinuya S, Nuclear medicine communications., 32: 1033-9., Nov. 2011
Quantification of myocardial perfusion SPECT using freeware package (cardioBull), Okuda K, Nakajima K, Hosoya T, Ishikawa T, Matsuo S, Kawano M, Taki J, Kinuya S, Annals of nuclear medicine., 25: 571-9., Oct. 2011
Semi-automated algorithm for calculating heart-to-mediastinum ratio in cardiac Iodine-123 MIBG imaging., Okuda K, Nakajima K, Hosoya T, Ishikawa T, Konishi T, Matsubara K, Matsuo S, Kinuya S., Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 18: 82-9., Feb. 2011
The relationship between stress-induced myocardial ischemia and coronary artery atherosclerosis measured by hybrid SPECT/CT camera., (Matsuo S), Nakajima K, Okuda K, Kinuya S, Annals of nuclear medicine., 25: 650-6, 2011
Estimation of cardiac event risk by gated myocardial perfusion imaging and quantitative scoring methods based on a multi-center J-ACCESS database., Nakajima K, Matsuo S, Okuda K, Wakabayashi H, Tsukamoto K, Nishimura T, 75:2417-2423, 2011
Estimation of Cardiac Event Risk by Gated Myocardial Perfusion Imaging and Quantitative Scoring Methods Based on a Multi-Center J-ACCESS Database., (Nakajima K), Matsuo S, Okuda K, Wakabayashi H, Tsukamoto K, Nishimura T, Circulation journal : official journal of the Japanese Circulation Society, 75: 2417-23, 2011
The validity of multi-center common normal database for identifying myocardial ischemia: Japanese Society of Nuclear Medicine working group database., (Nakajima K), Matsuo S, Kawano M, Matsumoto N, Hashimoto J, Yoshinaga K, Taki J, Okuda K, Annals of nuclear medicine., 24: 99-105, 2010
The importance of population-specific normal database for quantification of myocardial ischemia: comparison between Japanese 360 and 180-degree databases and a US database., (Nakajima K), Okuda K, Kawano M, Matsuo S, Slomka P, Germano G, Kinuya S, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 16: 422-30, 2009
Clinical usefulness of novel cardiac MDCT/SPECT fusion image., (Matsuo S), Nakajima K, Akhter N, Wakabayashi H, Taki J, Okuda K, Kinuya S., Annals of nuclear medicine., 23: 579-86, 2009
Clinical usefulness of novel cardiac MDCT/SPECT fusion image., Matsuo S, Nakajima K, Akhter N, Wakabayashi H, Taki J, Okuda K, Kinuya S, 23:579-586, 2009
Characterization of Japanese standards for myocardial sympathetic and metabolic imaging in comparison with perfusion imaging., (Matsuo S), Nakajima K, Okuda K, Kawano M, Ishikawa T, Hosoya T, Taki J, Kinuya S., Annals of nuclear medicine., 23: 517-22, 2009
Attenuation correction of myocardial SPECT by scatter-photopeak window method in normal subjects., Okuda K, Nakajima K, Motomura N, Kubota M, Yamaki N, Maeda H, Matsuo S, Kinuya S, Annals of nuclear medicine., 23: 501-6, 2009
Regional wall thickening in gated myocardial perfusion SPECT in a Japanese population: effect of sex, radiotracer, rotation angles and frame rates., European journal of nuclear medicine and molecular imaging., 35: 1608-15, 2008
Correction of iodine-123-labeled meta-iodobenzylguanidine uptake with multi-window methods for standardization of the heart-to-mediastinum ratio., (Nakajima K), Matsubara K, Ishikawa T, Motomura N, Maeda R, Akhter N, Okuda K, Taki J, Kinuya S, Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 14: 843-51, 2007
What does diagnostic threshold mean? Deterministic and probabilistic considerations, (Nakajima K), Okuda K, Komatsu J, Journal of Nuclear Cardiology, : , 2021
Metal artifact reduction for improving quantitative SPECT/CT imaging., (Konishi T), Shibutani T, Okuda K, Yoneyama H, Moribe R, Onoguchi M, Nakajima K, Kinuya S., Annals of nuclear medicine, 35:291-298, Jan. 2021
What does diagnostic threshold mean? Deterministic and probabilistic considerations., (Nakajima K), Okuda K, Komatsu J., J Nucl Cardiol, 28:1702-1706, 2021
