Faculty Profiles - NAGANAWA, Shinji

Papers - NAGANAWA, Shinji

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Impact of the Glymphatic System on the Kinetic and Distribution of Gadodiamide in the Rat Brain: Observations by Dynamic MRI and Effect of Circadian Rhythm on Tissue Gadolinium Concentrations. Reviewed International coauthorship International journal Open Access

Toshiaki Taoka, Gregor Jost, Thomas Frenzel, Shinji Naganawa, Hubertus Pietsch

Investigative radiology Vol. 53 ( 9 ) page： 529 - 534 2018.9

Language：English Publishing type：Research paper (scientific journal)

OBJECTIVES: The glymphatic system is a recently hypothesized waste clearance system of the brain in which perivascular space constitutes a pathway similar to the lymphatic system in other body regions. Sleep and anesthesia are reported to influence the activity of the glymphatic system. Because rats are nocturnal animals, the glymphatic system is expected to be more active during the day. We attempted to elucidate the influence of the glymphatic system for intravenously injected gadodiamide in the rat brain by 2 experiments. One was a magnetic resonance imaging (MRI) experiment to evaluate the short-term dynamics of signal intensity changes after gadodiamide administration. The other was a quantification experiment to evaluate the concentration of retained gadolinium within the rat brain after repeated intravenous administration of gadodiamide at different times of day and levels of anesthesia. MATERIALS AND METHODS: The imaging experiment was performed on 6 rats that received an intravenous injection of gadodiamide (1 mmol/kg) and dynamic MRI for 3 hours at 2.4-minute intervals. The time course of the signal intensity changes was evaluated for different brain structures. The tissue quantification experiment was performed on 24 rats divided into 4 groups by injection time (morning, late afternoon) and anesthesia (none, short, long) during administration. All animals received gadodiamide (1.8 mmol/kg, 8 times over 2 weeks). Gadolinium concentration of dissected brain tissues was quantified 5 weeks after the last administration by inductively coupled plasma mass spectrometry. RESULTS: In the imaging experiment, muscle and the fourth ventricle showed an instantaneous signal intensity increase immediately after gadodiamide injection. The signal curve of the cerebral cortex and deep cerebellar nuclei reached the peak signal intensity later than the fourth ventricle but earlier than that of the prepontine cistern. In the gadolinium quantification experiment, the concentration in the group with the morning injection showed a significantly lower concentration than the late afternoon injection group. The lowest tissue gadolinium concentrations were found in the groups injected in the morning during long anesthesia. CONCLUSIONS: Instantaneous transition of gadodiamide from blood to cerebrospinal fluid was indicated by dynamic MRI. The gadodiamide distribution to the cerebral cortex and deep cerebellar nuclei seemed to depend on both blood flow and cerebrospinal fluid. This confirms previous studies indicating that the cerebrospinal fluid is one potential pathway of gadolinium-based contrast agent entry into the brain. For the distribution and clearance of the gadodiamide from brain tissue, involvement of the glymphatic system seemed to be indicated in terms of the influence of sleep and anesthesia.

DOI： 10.1097/RLI.0000000000000473

Open Access

Web of Science

PubMed

Generative Adversarial Networkを用いた肺結節の画像生成について

伊藤倫太郎, 岩野信吾, 長縄慎二

日本医学放射線学会秋季臨床大会抄録集 Vol. 54回 page： S561 - S561 2018.9

Histogram analysis of quantitative pharmacokinetic parameters on DCE-MRI: correlations with prognostic factors and molecular subtypes in breast cancer.

Nagasaka K, Satake H, Ishigaki S, Kawai H, Naganawa S

Breast cancer (Tokyo, Japan) 2018.8

【膵癌update】　診断　MRI/MRCP

小川　浩、竹原康雄、長縄慎二

臨床消化器内科 Vol. 33 ( 7 ) page： 789-793 2018.7

Myocardial motion analysis based on an optical flow method using tagged MR images. Reviewed

Daiki Tabata, Haruo Isoda, Kaori Kato, Hiroki Matsubara, Takafumi Kosugi, Takashi Kosugi, Masaki Terada, Atsushi Fukuyama, Yoshiaki Komori, Shinji Naganawa

Radiological physics and technology Vol. 11 ( 2 ) page： 202 - 211 2018.6

Language：English Publishing type：Research paper (scientific journal)

We developed a method of velocimetry based on an optical flow method using quantitative analyses of tagged magnetic resonance (MR) images (tagged MR-optical flow velocimetry, tMR-O velocimetry). The purpose of our study was to examine the accuracy of measurement of the proposed tMR-O velocimetry. We performed retrospective pseudo-electrocardiogram (ECG) gating tagged cine MR imaging on a rotating phantom. We optimized imaging parameters for tagged MR imaging, and validated the accuracy of tMR-O velocimetry. Our results indicated that the difference between the reference velocities and the computed velocities measured using optimal imaging parameters was less than 1%. In addition, we performed tMR-O velocimetry and echocardiography on 10 healthy volunteers, for four sections of the heart (apical, midventricular, and basal sections aligned with the short-axis, and a four-chamber section aligned with the long-axis), and obtained radial and longitudinal myocardial velocities in these sections. We compared the myocardial velocities obtained using tMR-O velocimetry with those obtained using echocardiography. Our results showed good agreement between tMR-O velocimetry and echocardiography in the radial myocardial velocities in three short-axial sections and longitudinal myocardial velocities on the midventricular portion of the four-chamber section in the long-axis. In the study conducted on the rotating phantom, tMR-O velocimetry showed high accuracy; moreover, in the healthy volunteers, the myocardial velocities obtained using tMR-O velocimetry were relatively similar to those obtained using echocardiography. In conclusion, tMR-O velocimetry is a potentially feasible method for analyzing myocardial motion in the human heart.

DOI： 10.1007/s12194-018-0456-3

Web of Science

PubMed

Inter-individual Comparison of Gadobutrol and Gadoteridol Tissue Time-intensity Profiles for Dynamic Susceptibility Contrast Perfusion MR Imaging. Open Access

Yamada M, Taoka T, Kawaguchi A, Yasuda K, Niinomi Y, Ohashi Y, Okuda T, Naganawa S

Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2018.5

Diagnostic performance of <sup>18</sup>F-FDG PET/CT and whole-body diffusion-weighted imaging with background body suppression (DWIBS) in detection of lymph node and bone metastases from pediatric neuroblastoma. Open Access

Ishiguchi H, Ito S, Kato K, Sakurai Y, Kawai H, Fujita N, Abe S, Narita A, Nishio N, Muramatsu H, Takahashi Y, Naganawa S

Annals of nuclear medicine 2018.4

An unbiased data-driven age-related structural brain parcellation for the identification of intrinsic brain volume changes over the adult lifespan.

Bagarinao E, Watanabe H, Maesawa S, Mori D, Hara K, Kawabata K, Yoneyama N, Ohdake R, Imai K, Masuda M, Yokoi T, Ogura A, Wakabayashi T, Kuzuya M, Ozaki N, Hoshiyama M, Isoda H, Naganawa S, Sobue G

NeuroImage Vol. 169 page： 134 - 144 2018.4

Tau Kinetics in Neurons and the Human Central Nervous System Open Access

Sato Chihiro, Barthelemy Nicolas R., Mawuenyega Kwasi G., Patterson Bruce W., Gordon Brian A., Jockel-Balsarotti Jennifer, Sullivan Melissa, Crisp Matthew J., Kasten Tom, Kirmess Kristopher M., Kanaan Nicholas M., Yarasheski Kevin E., Baker-Nigh Alaina, Benzinger Tammie L. S., Miller Timothy M., Karch Celeste M., Bateman Randall J.

NEURON Vol. 97 ( 6 ) page： 1284 - + 2018.3

Computer-aided Volumetry of Part-Solid Lung Cancers by Using CT: Solid Component Size Predicts Prognosis.

Kamiya S, Iwano S, Umakoshi H, Ito R, Shimamoto H, Nakamura S, Naganawa S

Radiology page： 172319 2018.3

Improved 3D-real Inversion Recovery: A Robust Imaging Technique for Endolymphatic Hydrops after Intravenous Administration of Gadolinium. Open Access

Naganawa S, Kawai H, Taoka T, Sone M

Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine 2018.3

Distinct manifestation of cognitive deficits associate with different resting-state network disruptions in non-demented patients with Parkinson's disease.

Kawabata K, Watanabe H, Hara K, Bagarinao E, Yoneyama N, Ogura A, Imai K, Masuda M, Yokoi T, Ohdake R, Tanaka Y, Tsuboi T, Nakamura T, Hirayama M, Ito M, Atsuta N, Maesawa S, Naganawa S, Katsuno M, Sobue G

Journal of neurology Vol. 265 ( 3 ) page： 688-700 2018.3

Distinct manifestation of cognitive deficits associate with different resting-state network disruptions in non-demented patients with Parkinson's disease

Kawabata Kazuya, Watanabe Hirohisa, Hara Kazuhiro, Bagarinao Epifanio, Yoneyama Noritaka, Ogura Aya, Imai Kazunori, Masuda Michihito, Yokoi Takamasa, Ohdake Reiko, Tanaka Yasuhiro, Tsuboi Takashi, Nakamura Tomohiko, Hirayama Masaaki, Ito Mizuki, Atsuta Naoki, Maesawa Satoshi, Naganawa Shinji, Katsuno Masahisa, Sobue Gen

JOURNAL OF NEUROLOGY Vol. 265 ( 3 ) page： 688-700 2018.3

特集　脳脊髄液動態のすべて　脳脊髄液による老廃物のクリアランス―glymphaticシステム―

田岡俊昭、長縄慎二

画像診断 Vol. 38 ( 3 ) page： 268-276 2018.3

MR画像による脳内の物質輸送機構の解明

長縄慎二、田岡俊昭、川井　恒

脳とこころの研究センター　脳疾患克服に向けた次世代創薬開発のためのコホート・コンソーシアム型研究拠点形成　　　平成29年度活動報告書 page： 25-26 2018.3

脳とこころの研究センター長　挨拶

長縄慎二

脳とこころの研究センター　脳疾患克服に向けた次世代創薬開発のためのコホート・コンソーシアム型研究拠点形成　　　平成29年度活動報告書 page： 1 2018.3

後下小脳動脈抹消部動脈瘤の診断におけるthin slab MIP法の有用性

長縄慎二

日本脳神経CI学会機関誌 Vol. 39 ( 3-4 ) page： 121-130 2018.3

Patients with anti-thyroid antibodies are prone to develop destructive thyroiditis by nivolumab: a prospective study Reviewed

Tomoko Kobayashi, Shintaro Iwama, Yoshinori Yasuda, Norio Okada, Taku Tsunekawa, Takeshi Onoue, Hiroshi Takagi, Daisuke Hagiwara, Yoshihiro Ito, Yoshiaki Morishita, Motomitsu Goto, Hidetaka Suga, Ryoichi Banno, Kenji Yokota, Tetsunari Hase, Masahiro Morise, Naozumi Hashimoto, Masahiko Ando, Hitoshi Kiyoi, Momokazu Gotoh, Yuichi Ando, Masashi Akiyama, Yoshinori Hasegawa, Hiroshi Arima

Journal of the Endocrine Society 2018.2

早期声門癌に対するS-1併用化学放射線療法の長期成績

高瀬裕樹, 伊藤善之, 木村香菜, 岡田徹, 久保田誠司, 川村麻里子, 中原理絵, 大家祐実, 香西由加, 長縄慎二, 藤本保志, 曾根三千彦

Japanese Journal of Radiology Vol. 36 ( Suppl. ) page： 22 - 22 2018.2

胸壁並行断面CTを用いた間質性肺炎の経時的評価

馬越弘泰, 岩野信吾, 伊藤倫太郎, 島本宏矩, 長縄慎二

Japanese Journal of Radiology Vol. 36 ( Suppl. ) page： 19 - 19 2018.2

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Papers - NAGANAWA, Shinji