Search results for: Yoshiharu Ohno

Items from 1 to 20 out of 116 results

article

Lung T₂* mapping using 3D ultrashort TE with tight intervals δTE

Vadim Malis, Yoshimori Kassai, Diana Vucevic, Won C. Bae, more

Magnetic Resonance in Medicine > 90 > 5 > 2001 - 2010

Purpose To develop 3D ultrashort‐TE (UTE) sequences with tight TE intervals (δTE), allowing for accurate

T_{2}^{*}

mapping of lungs under free breathing. Methods We have implemented a four‐echo UTE sequence with δTE (< 0.5 ms). A Monte‐Carlo simulation was performed to identify an optimal number of echoes that would result in a significant improvement in the accuracy of...

article

Chemical Exchange Saturation Transfer MRI: Capability for Predicting Therapeutic Effect of Chemoradiotherapy on Non‐Small Cell Lung Cancer Patients

Yoshiharu Ohno, Masao Yui, Kaori Yamamoto, Daisuke Takenaka, more

Journal of Magnetic Resonance Imaging > 58 > 1 > 174 - 186

Background Amide proton transfer (APT) weighted chemical exchange saturation transfer CEST (APTw/CEST) magnetic resonance imaging (MRI) has been suggested as having the potential for assessing the therapeutic effect of brain tumors or rectal cancer. Moreover, diffusion‐weighted imaging (DWI) and positron emission tomography fused with computed tomography by means of 2‐[fluorine‐18]‐fluoro‐2‐deoxy‐D‐glucose...

article

Computed DWI MRI Results in Superior Capability for N‐Stage Assessment of Non‐Small Cell Lung Cancer Than That of Actual DWI, STIR Imaging, and FDG‐PET/CT

Yoshiharu Ohno, Masao Yui, Daisuke Takenaka, Takeshi Yoshikawa, more

Journal of Magnetic Resonance Imaging > 57 > 1 > 259 - 272

Background Computed diffusion‐weighted imaging (cDWI) is a mathematical computation technique that generates DWIs for any b‐value by using actual DWI (aDWI) data with at least two different b‐values and may improve differentiation of metastatic from nonmetastatic lymph nodes. Purpose To determine the appropriate b‐value for cDWI to achieve a better diagnostic capability for lymph node staging (N‐staging)...

article

Editorial for “MRI Radiomics‐Based Nomogram From Primary Tumor for Pretreatment Prediction of Peripancreatic Lymph Node Metastasis in Pancreatic Ductal Adenocarcinoma: A Multicenter Study”

Takeshi Yoshikawa, Daisuke Takenaka, Yoshiharu Ohno

Journal of Magnetic Resonance Imaging > 55 > 3 > 840 - 841

article

3D Oxygen‐Enhanced MRI at 3T MR System: Comparison With Thin‐Section CT of Quantitative Capability for Pulmonary Functional Loss Assessment and Clinical Stage Classification of COPD in Smokers

Yoshiharu Ohno, Masao Yui, Takeshi Yoshikawa, Shinichiro Seki, more

Journal of Magnetic Resonance Imaging > 53 > 4 > 1042 - 1051

Background Oxygen (O₂)‐enhanced MRI is mainly performed by a 2D sequence using 1.5T MR systems but trying to be obtained by a 3D sequence using a 3T MR system. Purpose To compare the capability of 3D O₂‐enhanced MRI and that of thin‐section computed tomography (CT) for pulmonary functional loss assessment and clinical stage classification of chronic obstructive pulmonary disease (COPD) in smokers...

article

Factors associated with silent cerebral events during atrial fibrillation ablation in patients on uninterrupted oral anticoagulation

Masahide Harada, Yuji Motoike, Yoshihiro Nomura, Asuka Nishimura, more

Journal of Cardiovascular Electrophysiology > 31 > 11 > 2889 - 2897

Introduction Silent cerebral events (SCEs) are related to the potential thromboembolic risk in atrial fibrillation (AF) ablation. Periprocedural uninterrupted oral anticoagulation (OAC) reportedly reduced the risk of SCEs, but the incidence still remains. Methods and Results AF patients undergoing catheter ablation were eligible. All patients took non–vitamin K antagonist oral anticoagulants (NOACs;...

article

Effects of acquisition method and reconstruction algorithm for CT number measurement on standard-dose CT and reduced-dose CT: a QIBA phantom study

Yoshiharu Ohno, Yasuko Fujisawa, Kenji Fujii, Naoki Sugihara, more

Japanese Journal of Radiology > 2019 > 37 > 5 > 399-411

Purpose To compare the effect of different acquisition and reconstruction methods on the radiation dose and accuracy of CT number measurements, using a 320-detector row CT and a Quantitative Imaging Biomarker Alliance (QIBA) recommended phantom. Materials and methods Acquisitions were performed on a 320-detector row CT, as 64- and 80-detector row helical and wide detector step-and-shoot (i.e., wide...

article

Association of Focal Radiation Dose Adjusted on Cross Sections with Subsolid Nodule Visibility and Quantification on Computed Tomography Images Using AIDR 3D

Yukihiro Nagatani, Hiroshi Moriya, Satoshi Noma, Shigetaka Sato, more

Academic Radiology > 2018 > 25 > 9 > 1156-1166

The objectives of this study were to compare the visibility and quantification of subsolid nodules (SSNs) on computed tomography (CT) using adaptive iterative dose reduction using three-dimensional processing between 7 and 42 mAs and to assess the association of size-specific dose estimate (SSDE) with relative measured value change between 7 and 84 mAs (RMVC_7–84) and relative measured value change...

article

MRI for solitary pulmonary nodule and mass assessment: Current state of the art

Yoshiharu Ohno, Hans‐Ulrich Kauczor, Hiroto Hatabu, Joon Beom Seo, more

Journal of Magnetic Resonance Imaging > 47 > 6 > 1437 - 1458

Since the clinical introduction of magnetic resonance imaging (MRI), the chest has been one of its most challenging applications, and many physicists and radiologists have tried since the 1980s to use MR for assessment of different lung diseases as well as mediastinal and pleural diseases. Since then, however, technical advances in sequencing, scanners, and coils, adaptation of parallel imaging techniques,...

article

Amide proton transfer‐weighted imaging to differentiate malignant from benign pulmonary lesions: Comparison with diffusion‐weighted imaging and FDG‐PET/CT

Yoshiharu Ohno, Yuji Kishida, Shinichiro Seki, Masao Yui, more

Journal of Magnetic Resonance Imaging > 47 > 4 > 1013 - 1021

Purpose To compare the capability of amide proton transfer‐weighted (APTw) imaging, diffusion‐weighted imaging (DWI), and FDG‐PET/CT for the differentiation of malignant from benign pulmonary nodules. Materials and Methods In all, 82 consecutive patients with pulmonary nodules underwent APTw imaging and DWI with a 3T system, and FDG‐PET/CT. All nodules were divided as either malignant (n = 49)...

article

Diagnostic performance of different imaging modalities in the assessment of distant metastasis and local recurrence of tumor in patients with non‐small cell lung cancer

Yoshiharu Ohno, Takeshi Yoshikawa, Yuji Kishida, Shinichiro Seki, more

Journal of Magnetic Resonance Imaging > 46 > 6 > 1707 - 1717

Purpose To compare the diagnostic performance of positron emission tomography with [18F] fluoro‐2‐deoxy‐glucose (FDG‐PET) coregistered with magnetic resonance imaging (FDG‐PET/MRI), MRI with and without diffusion‐weighted imaging (DWI), FDG‐PET fused with computed tomography (FDG‐PET/CT) with brain contrast‐enhanced (CE‐) MRI, and routine radiological examination for assessment of postoperative recurrence...

article

Sub-solid Nodule Detection Performance on Reduced-dose Computed Tomography with Iterative Reduction

Yukihiro Nagatani, Masashi Takahashi, Mitsuru Ikeda, Tsuneo Yamashiro, more

Academic Radiology > 2017 > 24 > 8 > 995-1007

This study aimed to compare sub-solid nodule detection performances (SSNDP) on chest computed tomography (CT) with Adaptive Iterative Dose Reduction using Three Dimensional Processing (AIDR 3D) between 7 mAs (0.21 mSv) and 42 mAs (1.28 mSv) in total and in subgroups classified by nodular size, characteristics, and location, and analyze the association of SSNDP with size-specific dose estimate (SSDE)...

article

Securing safe and informative thoracic CT examinations—Progress of radiation dose reduction techniques

Takeshi Kubo, Yoshiharu Ohno, Joon Beom Seo, Tsuneo Yamashiro, more

European Journal of Radiology > 2017 > 86 > C > 313-319

The increase in the radiation exposure from CT examinations prompted the investigation on the various dose-reduction techniques. Significant dose reduction has been achieved and the level of radiation exposure of thoracic CT is expected to reach the level equivalent to several chest X-ray examinations. With more scanners with advanced dose reduction capability deployed, knowledge on the radiation...

article

Dynamic contrast-enhanced perfusion area-detector CT assessed with various mathematical models: Its capability for therapeutic outcome prediction for non-small cell lung cancer patients with chemoradiotherapy as compared with that of FDG-PET/CT

Yoshiharu Ohno, Yasuko Fujisawa, Hisanobu Koyama, Yuji Kishida, more

European Journal of Radiology > 2017 > 86 > C > 83-91

To directly compare the capability of dynamic first-pass contrast-enhanced (CE-) perfusion area-detector CT (ADCT) and PET/CT for early prediction of treatment response, disease progression and overall survival of non-small cell carcinoma (NSCLC) patients treated with chemoradiotherapy.Fifty-three consecutive Stage IIIB NSCLC patients who had undergone PET/CT, dynamic first-pass CE-perfusion ADCT,...

article

Screening for lung cancer: Does MRI have a role?

Juergen Biederer, Yoshiharu Ohno, Hiroto Hatabu, Mark L. Schiebler, more

European Journal of Radiology > 2017 > 86 > C > 353-360

While the inauguration of national low dose computed tomographic (LDCT) lung cancer screening programs has started in the USA, other countries remain undecided, awaiting the results of ongoing trials.The continuous technical development achieved by stronger gradients, parallel imaging and shorter echo time has made lung magnetic resonance imaging (MRI) an interesting alternative to CT. For the detection...

article

Xenon-enhanced CT using subtraction CT: Basic and preliminary clinical studies for comparison of its efficacy with that of dual-energy CT and ventilation SPECT/CT to assess regional ventilation and pulmonary functional loss in smokers

Yoshiharu Ohno, Takeshi Yoshikawa, Daisuke Takenaka, Yasuko Fujisawa, more

European Journal of Radiology > 2017 > 86 > C > 41-51

To prospectively and directly compare the capability for assessments of regional ventilation and pulmonary functional loss in smokers of xenon-ventilation CT obtained with the dual-energy CT (DE-CT) and subtraction CT (Sub-CT)Twenty-three consecutive smokers (15 men and 8 women, mean age: 69.7±8.7years) underwent prospective unenhanced and xenon-enhanced CTs, the latter by Sub-CT and DE-CT methods,...

article

Introduction to the EJR Special issue on functional lung imaging

Mark L. Schiebler, Yoshiharu Ohno

European Journal of Radiology > 2017 > 86 > C > 296

article

Radiomics and its emerging role in lung cancer research, imaging biomarkers and clinical management: State of the art

Geewon Lee, Ho Yun Lee, Hyunjin Park, Mark L. Schiebler, more

European Journal of Radiology > 2017 > 86 > C > 297-307

With the development of functional imaging modalities we now have the ability to study the microenvironment of lung cancer and its genomic instability. Radiomics is defined as the use of automated or semi-automated post-processing and analysis of large amounts of quantitative imaging features that can be derived from medical images. The automated generation of these analytical features helps to quantify...

article

Pulmonary MR angiography and perfusion imaging—A review of methods and applications

Christopher S. Johns, Andrew J. Swift, Paul J.C. Hughes, Yoshiharu Ohno, more

European Journal of Radiology > 2017 > 86 > C > 361-370

The pulmonary vasculature and its role in perfusion and gas exchange is an important consideration in many conditions of the lung and heart. Currently the mainstay of imaging of the vasculature and perfusion of the lungs lies with CT and nuclear medicine perfusion scans, both of which require ionizing radiation exposure. Improvements in MRI techniques have increased the use of MRI in pulmonary vascular...

article

Improved image quality in abdominal CT in patients who underwent treatment for hepatocellular carcinoma with small metal implants using a raw data-based metal artifact reduction algorithm

Keitaro Sofue, Takeshi Yoshikawa, Yoshiharu Ohno, Noriyuki Negi, more

European Radiology > 2017 > 27 > 7 > 2978-2988

Objectives To determine the value of a raw data-based metal artifact reduction (SEMAR) algorithm for image quality improvement in abdominal CT for patients with small metal implants. Methods Fifty-eight patients with small metal implants (3–15 mm in size) who underwent treatment for hepatocellular carcinoma were imaged with CT. CT data were reconstructed by filtered back projection with and without...

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INFONA - science communication portal

Search results for: Yoshiharu Ohno

Lung T₂* mapping using 3D ultrashort TE with tight intervals δTE

Chemical Exchange Saturation Transfer MRI: Capability for Predicting Therapeutic Effect of Chemoradiotherapy on Non‐Small Cell Lung Cancer Patients

Computed DWI MRI Results in Superior Capability for N‐Stage Assessment of Non‐Small Cell Lung Cancer Than That of Actual DWI, STIR Imaging, and FDG‐PET/CT

Editorial for “MRI Radiomics‐Based Nomogram From Primary Tumor for Pretreatment Prediction of Peripancreatic Lymph Node Metastasis in Pancreatic Ductal Adenocarcinoma: A Multicenter Study”

3D Oxygen‐Enhanced MRI at 3T MR System: Comparison With Thin‐Section CT of Quantitative Capability for Pulmonary Functional Loss Assessment and Clinical Stage Classification of COPD in Smokers

Factors associated with silent cerebral events during atrial fibrillation ablation in patients on uninterrupted oral anticoagulation

Effects of acquisition method and reconstruction algorithm for CT number measurement on standard-dose CT and reduced-dose CT: a QIBA phantom study

Association of Focal Radiation Dose Adjusted on Cross Sections with Subsolid Nodule Visibility and Quantification on Computed Tomography Images Using AIDR 3D

MRI for solitary pulmonary nodule and mass assessment: Current state of the art

Amide proton transfer‐weighted imaging to differentiate malignant from benign pulmonary lesions: Comparison with diffusion‐weighted imaging and FDG‐PET/CT

Diagnostic performance of different imaging modalities in the assessment of distant metastasis and local recurrence of tumor in patients with non‐small cell lung cancer

Sub-solid Nodule Detection Performance on Reduced-dose Computed Tomography with Iterative Reduction

Securing safe and informative thoracic CT examinations—Progress of radiation dose reduction techniques

Dynamic contrast-enhanced perfusion area-detector CT assessed with various mathematical models: Its capability for therapeutic outcome prediction for non-small cell lung cancer patients with chemoradiotherapy as compared with that of FDG-PET/CT

Screening for lung cancer: Does MRI have a role?

Xenon-enhanced CT using subtraction CT: Basic and preliminary clinical studies for comparison of its efficacy with that of dual-energy CT and ventilation SPECT/CT to assess regional ventilation and pulmonary functional loss in smokers

Introduction to the EJR Special issue on functional lung imaging

Radiomics and its emerging role in lung cancer research, imaging biomarkers and clinical management: State of the art

Pulmonary MR angiography and perfusion imaging—A review of methods and applications

Improved image quality in abdominal CT in patients who underwent treatment for hepatocellular carcinoma with small metal implants using a raw data-based metal artifact reduction algorithm

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