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全身MRI检查、全身扩散MR成像与一体化FdG PET/CT诊断M期非小细胞肺癌的对照性研究

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国际医学放射学杂志 2008年第5期31卷 407-408页

作者： Y.Ohno H.Koyama Y.Onishi d.takenaka M.Nogami T. Yoshikawa 高莉 department of Radiology Kobe University Graduate School of Medicine 7-5-2 Kusunoki-cho Chuo-ku Kobe 650-0017 Japan.

目的对单纯全身扩散加权成像（dWI）、全身磁共振成像（MRI）结合dWI、单纯全身MRI以及一体化^18F-氟脱氧葡萄糖（FdG）PET／CT对于非小细胞肺癌（NSCLC）病人M期的诊断价值进行前瞻陆直接对照研究。方法本研究经伦理委员会批准，所有... 详细信息

目的对单纯全身扩散加权成像（dWI）、全身磁共振成像（MRI）结合dWI、单纯全身MRI以及一体化^18F-氟脱氧葡萄糖（FdG）PET／CT对于非小细胞肺癌（NSCLC）病人M期的诊断价值进行前瞻陆直接对照研究。方法本研究经伦理委员会批准，所有受试者都签署了知情同意书。共计203例NSCLC病人（男109例，女94例，平均年龄72岁），进行了前瞻陛全身dWI、全身MRI和FdGPET／CT检。M期的最后诊断取决于所有影像检查和随访检查结果。

关键词： PET/CT 非小细胞肺癌 MRI检查全身扩散 CT诊断 FdG 一体化 MR成像

超短回波时间肺部MRI在肺结节的检测和肺结节分类的效能

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国际医学放射学杂志 2022年第3期 356-356页

作者： Y.Ohno d.takenaka T.Yoshikawa M.Yui H.Koyama K.Yamamoto 高淳

摘要已将具有超短回波时间(UTE)肺部MRI与胸部CT在结节检测和分类方面进行了比较。然而，仍然缺乏直接比较这些方法在肺CT筛查报告和数据系统(Lung-RAdS)评

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161例肺部结节非增强MRI的定量和定性评价

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国际医学放射学杂志 2008年第A6期31卷 520-520页

作者： H.Koyama Y.Ohno A.Kono d.takenaka Y.Maniwa Y.Nishimura 邓军 department of Radiology Kobe University Graduate School of Medicine 7-5-2 Kusunoki-cho Chuo-ku Kobe 650-0017 Kobe Japan.

本研究旨在前瞻性地比较非增强(Non-CE)MRI和多层CT(MdCT)对肺部结节的诊断能力。共161例病人的200个肺结节曾行MdCT和Non-CEMRI(T1WI,T2WI和STIR)

关键词：肺 MRI CT 原发肿瘤筛选

平扫T1加权MR成像上齿状核和苍白球高信号:与增加的钆类对比剂的累积剂量的关系

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国际医学放射学杂志 2014年第3期 277-277页

作者： T.Kanda K.Ishii H.Kawaguchi K.Kitajima d.takenaka 许玉峰 department of Radiology Teikyo University School of MedicineItabashi2-11-1 KagaItabashi-kuTokyo 173-8605Japan

摘要目的研究既往钆类对比剂注射次数和平扫T1加权MR成像上齿状核和苍白球高信号强度(SI)的相关性。方法本研究由机构审查委员会批准,免除书面知情同意通知。

关键词：苍白球齿状核丘脑 SI 间脑对比剂 T1 MR 平扫

校准剂量、低剂量和无剂量薄层影像检查:可疑肺结节病人中结节检出和结节分型评估能力的比较

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国际医学放射学杂志 2017年第5期 601-601页

作者： Y.Ohno Y.H.Koyama T.Yoshikawa Y.Kishida S.Seki d.takenaka 王臣 division of Functional and diagnostic Imaging Research Department of RadiologyAdvanced Biomedical Imaging Research CenterKobe University Graduate School of Medicine

摘要目的比较肺薄层超短回波时间(UTE)MRI与标准剂量和低剂量的薄层CT肺结节检出和结节分型评估的能力差异。材料与方法本研究获机构伦理委员会批准,病人均

关键词：低剂量 CT 标准剂量

全身MR、全身FdGPET/MR及全身FdGPET/CT3种成像的比较:对非小细胞肺癌病人TNM及临床分期评估效能的比较

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国际医学放射学杂志 2015年第4期 385-385页

作者： Y.Ohno H.Koyama T.Yoshikawa d.takenaka S.Seki M.Yui 高利珍 Advanced Biomedical Imaging Research Center Kobe University Graduate School of Medicine

摘要目的前瞻性地比较全身MR成像、有或无MRI信号强度(SI)评估的全身PET/MR成像及18F-FdG PET/CT成像评估非小细胞肺癌(NSCLC)病人TNM分期、临床分期及

关键词：临床分期 FdGPET/MR MR 全身 TNM CT

SH-wavefield simulation for a laterally heterogeneous whole-Earth model using the pseudospectral method

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Science China Earth Sciences 2011年第12期54卷 1940-1947页

作者： WANG YanBin takenaka Hiroshi department of Geophysics School of Earth and Space Sciences Peking University Beijing 100871 China department of Earth and Planetary Sciences Kyushu University Hakozaki 6-10-1 Fukuoka 812-8581 Japan

We present a scheme to simulate SH-wave propagation in a whole-Earth model with arbitrary lateral heterogeneities employing the Fourier pseudospectral method. Wave equations are defined in two-dimensional cylindrical coordinates and the model is taken through a great circle of the Earth. Spatial derivatives in the wave equations are calculated in the wavenumber domain by multiplication, and the transformation between spatial and wavenumber domains is performed via fast Fourier transformation. Because of the high accuracy and high speed of the Fourier pseudospectral method, the scheme enables us to calculate a short-wavelength global SH-wavefield with accurate waveforms and arrival times for models with heterogeneities that can be approximated as azimuthally symmetric. Comparing with two-dimensional simulation methods based on an axisymmetric model, implementing the seismic source in the present scheme is more convenient. We calculated the global SH-wavefield for the preliminary reference Earth model to identify the generation, reflection and refraction of various seismic phases propagating in the Earth. Applications to a heterogeneous global model with low-velocity perturbation above the core-mantle boundary were conducted to analyze the effect of lateral heterogeneity on global SH-wave propagation.

关键词： wave propagation computational seismology pseudospectral method global seismology core-mantle boundary

A scheme to treat the singularity in global seismic wavefield simulation using pseudospectral method with staggered grids

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Earthquake Science 2010年第2期23卷 121-127页

作者： Yanbin Wang Hiroshi takenaka department of Geophysics School of Earth and Space Sciences Peking University Beijing 100871 China department of Earth and Planetary Sciences Kyushu University Hakozaki 6-10-1 Fukuoka 812-8581 Japan

The pseudospectral method has been applied to the simulation of seismic wave propagation in 2-d global Earth model. When a whole Earth model is considered, the center of the Earth is included in the model and then singularity arises at the center of the Earth where r=0 since the 1/r term appears in the wave equations. In this paper, we extended the global seismic wavefield simulation algorithm for regular grid mesh to staggered grid configuration and developed a scheme to solve the numerical problems associated with the above singularity for a 2-d global Earth model defined on staggered grid using pseudospectral method. This scheme uses a coordinate transformation at the center of the model, in which the field variables at the center are calculated in Cartesian coordinates from the values on the grids around the center. It allows wave propagation through the center and hence the wavefield at the center can be stably calculated. Validity and accuracy of the scheme was tested by compared with the discrete wavenumber method. This scheme could also be suitable for other numerical methods or models parameterized in cylindrical or spherical coordinates when singularity arises at the center of the model.

关键词： seismic modeling wave propagation whole Earth pseudospectrai method staggered grid

Global SH-wave propagation in a 2d whole Moon model using the parallel hybrid PSM/FdM method

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Earthquake Science 2015年第3期28卷 163-174页

作者： Xianghua Jiang Yanbin Wang Yanfang Qin Hiroshi takenaka department of Geophysics School of Earth and Space SciencesPeking University Equipe de Géosciences Marines Institut de Physique du Globe de Paris department of Earth Sciences Faculty of Science Okayama University

We present numerical modeling of SH-wave propagation for the recently proposed whole Moon model and try to improve our understanding of lunar seismic wave propagation. We use a hybrid PSM/FdM method on staggered grids to solve the wave equations and implement the calculation on a parallel PC cluster to improve the computing efficiency. Features of global SH-wave propagation are firstly discussed for a 100-km shallow and900-km deep moonquakes, respectively. Effects of frequency range and lateral variation of crust thickness are then investigated with various models. Our synthetic waveforms are finally compared with observed Apollo data to show the features of wave propagation that were produced by our model and those not reproduced by our models. Our numerical modeling show that the low-velocity upper crust plays significant role in the development of reverberating wave trains. Increasing frequency enhances the strength and duration of the *** multiples dominate wavefields for shallow ***–mantle reflections can be clearly identified for deep event at low frequency. The layered whole Moon model and the low-velocity upper crust produce the reverberating wave trains following each phases consistent with observation. However, more realistic Moon model should be considered in order to explain the strong and slow decay scattering between various phases shown on observation data.

关键词： Whole Moon model Seismic wavefield SH-wave propagation Hybrid method Parallel computing