Research Topics
| H TakaoSummaryAffiliation: University of Tokyo Country: Japan Publications
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Detail Information
Publications
White matter microstructure asymmetry: Effects of volume asymmetry on fractional anisotropy asymmetryH Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan Electronic address
Neuroscience 231:1-12. 2013..The results of the present study suggest that these FA asymmetries are not caused by volume differences and reflect microscopic differences in the white matter...
A longitudinal study of brain volume changes in normal agingHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Eur J Radiol 81:2801-4. 2012..To evaluate the effect of normal aging on brain volumes and examine the effects of age and sex on the rates of changes in global and regional brain volumes...
Cost-effectiveness of treatment of unruptured intracranial aneurysms in patients with a history of subarachnoid hemorrhageHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Acad Radiol 15:1126-32. 2008....
Balloon-occluded retrograde transvenous obliteration of gastric varices using three-dimensional rotational angiographyH Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Japan
Br J Radiol 82:e55-7. 2009..Here, we report the case of a patient with gastric varices who was successfully treated with BRTO using three-dimensional rotational angiography...
True pancreaticoduodenal artery aneurysms: a decision analysisHidemasa Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo, Japan
Eur J Radiol 75:110-3. 2010..The purpose of this study was to evaluate the outcome of preventive treatment of unruptured pancreaticoduodenal artery aneurysms using a Markov model...
Screening for familial intracranial aneurysms: decision and cost-effectiveness analysisHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Acad Radiol 15:462-71. 2008..To evaluate the potential benefits, harms, and cost-effectiveness of screening for asymptomatic, unruptured intracranial aneurysms in family members of patients with aneurysmal subarachnoid hemorrhage (SAH)...
Use of a saline chaser in abdominal computed tomography: a systematic reviewHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
Clin Imaging 33:261-6. 2009..To perform a systematic review of the literature regarding the use of a saline chaser in abdominal computed tomography (CT)...
MR imaging of the biliary tract with Gd-EOB-DTPA: effect of liver function on signal intensityHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Eur J Radiol 77:325-9. 2011....
Cerebral asymmetry in patients with schizophrenia: a voxel-based morphometry (VBM) and diffusion tensor imaging (DTI) studyHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Magn Reson Imaging 31:221-6. 2010..To evaluate the differences in gray- and white-matter asymmetry between schizophrenia patients and normal subjects...
Aging effects on cerebral asymmetry: a voxel-based morphometry and diffusion tensor imaging studyHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
Magn Reson Imaging 28:65-9. 2010..Our results showed no significant effects of aging on either gray matter volume asymmetry or white matter fractional anisotropy asymmetry...
Computational analysis of cerebral cortexHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, 113 8655, Japan
Neuroradiology 52:691-8. 2010..DISCUSSION: In this review, we describe MRI data acquisition and preprocessing for morphometric analysis of the brain and present a brief summary of voxel-based morphometry and cortical thickness analysis...
Natural history of true pancreaticoduodenal artery aneurysmsH Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo, Japan
Br J Radiol 83:744-6. 2010..We conclude that the risk of rupture of true pancreaticoduodenal artery aneurysms might be lower than expected from the data on ruptured aneurysms; however, careful follow-up of untreated aneurysms is necessary...
Effects of gradient non-linearity correction and intensity non-uniformity correction in longitudinal studies using structural image evaluation using normalization of atrophy (SIENA)Hidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Bunkyo ku, Tokyo, Japan
J Magn Reson Imaging 32:489-92. 2010..To evaluate the effects of gradient nonlinearity correction and intensity nonuniformity correction on longitudinal (two-year) changes in global and regional brain volumes...
Effect of scanner in asymmetry studies using diffusion tensor imagingHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
Neuroimage 54:1053-62. 2011..The results indicate that the use of multiple scanners increases variability of DTI asymmetry measurements, and can affect the results of cross-sectional and especially longitudinal DTI asymmetry studies...
Gray and white matter asymmetries in healthy individuals aged 21-29 years: a voxel-based morphometry and diffusion tensor imaging studyHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, Japan
Hum Brain Mapp 32:1762-73. 2011....
Effect of scanner in longitudinal diffusion tensor imaging studiesHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Hongo, Bunkyo ku, Tokyo, Japan
Hum Brain Mapp 33:466-77. 2012..These results indicate that inter-scanner variability and scanner upgrade can significantly affect the results of longitudinal diffusion tensor imaging studies...
Effect of head size on diffusion tensor imagingHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, Japan
Neuroimage 57:958-67. 2011..When total intracranial volumes are significantly different between groups, it may be necessary to control for total intracranial volume in the statistical analysis, depending on the hypothesis being tested...
Effect of scanner in longitudinal studies of brain volume changesHidemasa Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Magn Reson Imaging 34:438-44. 2011..To evaluate the effects of drift in scanner hardware and inter-scanner variability on global and regional brain volume changes using longitudinal data obtained on two scanners of the exact same model...
White matter asymmetry in healthy individuals: a diffusion tensor imaging study using tract-based spatial statisticsH Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Neuroscience 193:291-9. 2011..The results of our study demonstrate white matter asymmetry in healthy adults and suggest that white matter asymmetry is relatively stable during aging and not much different between males and females...
Treatment of ruptured intracranial aneurysms: a decision analysisH Takao
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, Japan
Br J Radiol 81:299-303. 2008..For ruptured intracranial aneurysms suitable to both neurosurgical and endovascular treatment, endovascular treatment is more effective than neurosurgery over a lifetime...
Primary malignant melanoma of the anterior mediastinum: CT and MR findingsHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
Clin Imaging 32:58-60. 2008..We report a case of primary malignant melanoma of the anterior mediastinum and discuss its imaging findings on computed tomography and magnetic resonance imaging...
Evaluation of an automated system for temporal subtraction of thin-section thoracic CTH Takao
Department of Radiology, Showa General Hospital, Kodaira, Tokyo, Japan
Br J Radiol 80:85-9. 2007..The average displacements of the landmarks were less than the dimensions of a voxel. Further study is necessary to determine whether such a computer system can improve the diagnostic performance of radiologists...
Diffusion-weighted magnetic resonance imaging in pituitary abscessHidemasa Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo 187 0004, Japan
J Comput Assist Tomogr 30:514-6. 2006..We present a case of pituitary abscess where diffusion-weighted magnetic resonance imaging was useful in making the preoperative diagnosis of pituitary abscess...
Ectopic thyroid in the adrenal gland: Computed tomography findingsHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
J Comput Assist Tomogr 30:221-2. 2006..A case of ectopic thyroid in the adrenal gland is reported, and its imaging findings on computed tomography are discussed...
Cerebral lipiodol embolism after transcatheter arterial chemoembolization of hepatocellular carcinomaHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
J Comput Assist Tomogr 29:680-2. 2005..Magnetic resonance imaging showed restricted diffusion within the thalami and basal ganglia. The patient's level of consciousness gradually improved, and all neurologic symptoms disappeared over 6 weeks...
Coil embolization of an arteriobiliary fistula caused by hepatic intra-arterial chemotherapyHidemasa Takao
Department of Radiology, Showa General Hospital, Kodaira, Tokyo 187 0004, Japan
Cardiovasc Intervent Radiol 28:825-7. 2005..Although such complications usually herald the termination of intra-arterial chemotherapy, the patient underwent percutaneous implantation of a new catheter-port system, and intra-arterial chemotherapy was restarted...
Perforated colonic diverticulitis mimicking urachal carcinoma: computed tomography and magnetic resonance findingsHidemasa Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo 187 0004, Japan
Clin Imaging 29:144-6. 2005..We report on a case of perforated diverticulitis of the sigmoid colon, which mimicked urachal carcinoma, and discuss its radiological findings...
Methionine and glucose metabolism of central neurocytoma: a PET studyHidemasa Takao
Department of Radiology, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
Clin Nucl Med 29:838-9. 2004
Gastrointestinal stromal tumor of the retroperitoneum: CT and MR findingsHidemasa Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo, Japan
Eur Radiol 14:1926-9. 2004..GIST arising in the retroperitoneum is extremely rare, and its radiological findings have not been well described. We report a case of primary retroperitoneal GIST and discuss its imaging findings...
Gallium uptake in pericardial fat necrosisHidemasa Takao
Department of Radiology, Showa General Hospital, Kodaira, Tokyo, Japan
Clin Nucl Med 29:378-9. 2004
Central neurocytoma with craniospinal disseminationHidemasa Takao
Department of Radiology, Faculty of Medicine, University of Tokyo, Tokyo, Japan
J Neurooncol 61:255-9. 2003..After the radiation, the size of the tumor decreased. The report of this casewill be helpful in the treatment of disseminated central neurocytoma...
Serial diffusion-weighted magnetic resonance imaging in methanol intoxicationHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
J Comput Assist Tomogr 30:742-4. 2006..The MRI, which was performed on the third day after admission, showed new lesions in the subcortical white matter. The patient's general condition improved. His visual acuity, however, did not improve...
Mycotic pulmonary artery aneurysm diagnosed 18 years after bacterial endocarditisHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
Clin Imaging 31:131-3. 2007..The aneurysm was considered to be mycotic in origin. The aneurysm was treated by coil embolization using 19 detachable coils measuring 425 cm in overall length...
Treatment of unruptured intracranial aneurysms: decision and cost-effectiveness analysisHidemasa Takao
Department of Radiology, Showa General Hospital, and Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Radiology 244:755-66. 2007....
Superselective transcatheter arterial chemoembolisation of an unresectable hepatocellular carcinoma using three-dimensional rotational angiographyH Takao
Department of Radiology, Showa General Hospital, 2 450 Tenjincho, Kodaira, Tokyo, 187 0004, Japan
Br J Radiol 80:e85-7. 2007..Herein, the authors describe a case of a hepatocellular carcinoma successfully treated by superselective transcatheter arterial chemoembolisation using three-dimensional rotational angiography...
Safety of using iodized oil in chemoembolization for liver tumors in patients with previous adverse reactions to iodinated contrast mediaKanako Kunishima
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, Japan
Clin Imaging 33:365-8. 2009..To evaluate the safety of using iodized oil in chemoembolization for liver tumors in patients with previous adverse reactions to iodinated contrast media...
Effects of age and gender on white matter integrityS Inano
Department of Radiology, University of Tokyo, Bunkyo ku, Tokyo, Japan
AJNR Am J Neuroradiol 32:2103-9. 2011..The purpose of our study was to investigate age-related changes, sex differences, and age-by-sex interactions in white matter integrity (FA, AD, and RD) across the whole brain with a large sample...
Venous congestion associated with developmental venous anomaly: findings on susceptibility weighted imagingShiori Amemiya
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Magn Reson Imaging 28:1506-9. 2008..Susceptibility-weighted imaging revealed abnormal structures connected to the central collector of a DVA, which were not shown on other sequences. These structures were considered to be presumably thrombosed medullary veins...
Relationship between liver function and liver signal intensity in hepatobiliary phase of gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced magnetic resonance imagingTaku Tajima
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Comput Assist Tomogr 34:362-6. 2010....
High signal intensity in the dural sinuses on 3D-TOF MR angiography at 3.0 TSachiko Inano
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
Clin Imaging 34:332-6. 2010..The objective of this study was to examine the frequency of high signal intensity in the dural sinuses of normal subjects upon magnetic resonance (MR) angiography using 3.0-T scanners...
Transarterial embolization of a nonpuerperal traumatic vulvar hematomaKanako Kunishima
Department of Radiology, The University of Tokyo Hospital, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Radiat Med 26:168-70. 2008..We believe that transarterial embolization can be an effective treatment of nonpuerperal traumatic vulvar hematomas when conservative treatment fails...
Recently established entities of central nervous system tumors: review of radiological findingsShiori Amemiya
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Comput Assist Tomogr 32:279-85. 2008....
Computed tomographic coronary angiography for diagnosing stable coronary artery disease: a cost-utility and cost-effectiveness analysisShiori Amemiya
Department of Radiology, Graduate School of Medicine, University of Tokyo, Hongo, Bunkyo ku, Tokyo, Japan
Circ J 73:1263-70. 2009..To evaluate the lifetime potential benefits and cost-effectiveness of using 64 multidetector-row computed tomography coronary angiography (CTCA) as a noninvasive imaging modality for patients at risk for coronary artery disease (CAD)...
Temporal subtraction of thin-section thoracic computed tomography based on a 3-dimensional nonlinear geometric warping techniqueHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
J Comput Assist Tomogr 30:283-6. 2006..Nineteen (95%) of 20 results showed good or excellent image quality. The remaining 1 (5%) showed adequate image quality. Our preliminary computer system demonstrates the potential for a clinically useful automated subtraction system...
Free-breathing diffusion-weighted imaging for the assessment of inflammatory activity in Crohn's diseaseShigeru Kiryu
Department of Radiology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
J Magn Reson Imaging 29:880-6. 2009..To investigate the application of free-breathing diffusion-weighted MR imaging (DWI) to the assessment of disease activity in Crohn's disease...
Efficacy of double-arterial phase gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced liver magnetic resonance imaging compared with double-arterial phase multi-detector row helical computed tomographyHiroyuki Akai
Department of Radiology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
J Comput Assist Tomogr 33:887-92. 2009....
Structural and diffusional brain abnormality related to relatively low level alcohol consumptionHiroki Sasaki
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo 113 8655, Japan
Neuroimage 46:505-10. 2009..The current results suggest female brain vulnerability to alcohol, and a relation between subtle abnormality in the right amygdala and alcohol misuse...
Age-related changes in regional brain volume evaluated by atlas-based methodWataru Gonoi
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, 113 8655, Japan
Neuroradiology 52:865-73. 2010..We introduce an atlas-based method as a methodological alternative that calculates absolute volume as a non-biased and semi-automatic whole-brain technique...
Voxel-based analysis of the diffusion tensorOsamu Abe
Department of Radiology, Graduate School of Medicine, University of Tokyo, 7 3 1 Hongo, Bunkyo ku, Tokyo, 113 8655, Japan
Neuroradiology 52:699-710. 2010....
Risk analysis of unruptured aneurysms using computational fluid dynamics technology: preliminary resultsY Qian
The Jikei University School of Medicine, Tokyo, Japan
AJNR Am J Neuroradiol 32:1948-55. 2011..The aim of this article was to propose a hemodynamic parameter, EL, to determine the effects of stable unruptured aneurysms and of those that ruptured during the subsequent observation period...
Encapsulated fat necrosis mimicking abdominal liposarcoma: computed tomography findingsHidemasa Takao
Department of Radiology, Showa General Hospital, Tokyo, Japan
J Comput Assist Tomogr 28:193-4. 2004..We report on a case of abdominal encapsulated fat necrosis which mimicked abdominal liposarcoma, and we discuss its imaging findings on computed tomography (CT)...
Lung cancer incidence in middle-aged men estimated by low-dose computed tomography screeningTakeshi Nojo
Department of Healthcare Economics and Quality Management, Graduate School of Medicine, Kyoto University, Yoshidakonoe cho, Sakyo ku, Kyoto 606 8501, Japan
Lung Cancer 65:56-61. 2009..Our screening recommendations should be made with more caution...
Delayed hydrocephalus after embolization of unruptured aneurysms using bare platinum coils: report of 2 casesM Ozaki
Department of Neurosurgery, Division of Endovascular Neurosurgery, The Jikei University School of Medicine, Tokyo, Japan
AJNR Am J Neuroradiol 32:E188-90. 2011..Postembolization hydrocephalus with bare platinum coils has not been reported, to our knowledge. We report 2 cases of unusual delayed hydrocephalus after treatment of unruptured intracranial aneurysms with bare platinum coils...
Simultaneous diffusion-weighted magnetic resonance images and brain blood perfusion scintigraphy for a transient lesion in the splenium of the corpus callosumTakeshi Nojo
Department of Radiology, Tokyo Kita Social Insurance Hospital, 4 17 56 Akabanedai, Tokyo 115 0053, Japan
Brain Dev 30:200-2. 2008..However, normal blood perfusion was observed on brain blood perfusion scintigraphy. Transient axonal or intramyelinic edema might be a cause of the transient lesion in the splenium of the corpus callosum...
Selective catheterization of the inferior phrenic artery via the pancreaticoduodenal arcadeHidemasa Takao
J Vasc Interv Radiol 17:1856-7. 2006
Unruptured intracranial aneurysms: evidence and speculationsJean Raymond
Radiology 247:294; author reply 294. 2008
Compression of the extrahepatic bile duct by the portal vein: a diagnostic pitfall of MR cholangiopancreatographyHidemasa Takao
Eur Radiol 15:1069-70. 2005
