Faculty Profiles - TAOKA Toshiaki

Cerebral Infarction Associated with Heparin-Induced Thrombocytopenia in a Patient with Encephalitis Reviewed

Kozue Saito, Makito Hirano, Miyuki Kajitani, Toshiaki Taoka, Kimihiko Kichikawa, Satoshi Ueno

INTERNAL MEDICINE Vol. 48 ( 1 ) page： 71 - 74 2009

Language：English Publishing type：Research paper (scientific journal) Publisher：JAPAN SOC INTERNAL MEDICINE

We report a patient who had cerebral infarction associated with heparin-induced thrombocytopenia ( HIT) during treatment of aseptic encephalitis. In patients with intracranial inflammation, such as ours, the possibility of HIT has to be considered when heparin is used, since inflammatory cerebral lesions often cause vascular damage, which is an aggravating factor for HIT-associated thrombosis.

DOI： 10.2169/internalmedicine.48.1486

Erratum:CT·MRI[Equilibrium Res Vol.68(3) 113-118]

Taoka Tosiaki

Equilibrium Research Vol. 68 ( 4 ) page： 183 - 183 2009

Superior Clinical Impact of FDG-PET Compared to MRI for the Follow-up of a Patient with Sacral Lymphoma

Yamamoto Yasuhiro, Taoka Toshiaki, Nakamine Hirokazu

Journal of Clinical and Experimental Hematopathology Vol. 49 ( 2 ) page： 109 - 115 2009

Language：English Publishing type：Research paper (scientific journal) Publisher：The Japanese Society for Lymphoreticular Tissue Research

The assessment of residual tumors after treatment of malignant lymphoma (ML) is often difficult. Here we report a case of non-Hodgkin's lymphoma with a huge sacral tumor. After chemotherapy and following radiation therapy, a residual mass was detected on magnetic resonance imaging (MRI). However, a hypermetabolic lesion in the sacrum disappeared on 18F-fluorodeoxyglucose positron emission tomography (18F-FDG-PET) and clinically the patient was considered to achieve complete remission. Seven months after the completion of radiation therapy, a new tumor-like lesion in the sacrum developed on MRI, but hypermetabolic lesions were not detected on 18F-FDG-PET. Recurrence of lymphoma was denied by open biopsy of the lesion. 18F-FDG-PET has been of widespread use not only for staging but for post-treatment assessment of ML. Although MRI is a standard imaging tool for the assessment of bone involvement of ML, there have been few reports documenting the results of comparative studies on the usefulness of 18F-FDG-PET and MRI for the evaluation of residual mass in bone involvement of ML. The present case suggests that 18F-FDG-PET is superior to MRI not only in the evaluation of a residual mass but in the judgment of recurrence after treatment of such patients. [J Clin Exp Hematopathol 49(2) : 109-115, 2009]

DOI： 10.3960/jslrt.49.109

CiNii Research

頭部の3.0T MRI 映像情報

田岡俊昭

Medical 41(14) 2009

頭部の3.0MRI

田岡俊昭

映像情報 Medical 41 page： 68 - 75 2009

連合線維

田岡俊昭

画像診断 29(5) page： 485 - 498 2009

画像検査で脳を探る

田岡俊昭

Equibulum Reserch 68 page： 113 - 118 2009

Prominent signal intensity of T(1)/T(2) prolongation in subcortical white matter of the anterior temporal region on conventional screening MRI of late preterm infants with normal development International journal

Chatchada Wuttikul, Toshiaki Taoka, Toshiaki Akashi, Hiroyuki Nakagawa, Toshiteru Miyasaka, Masahiko Sakamoto, Katsutoshi Takayama, Takeshi Wada, Satoru Kitano, Junko Takahama, Nagaaki Marugami, Kimihiko Kichikawa

MAGNETIC RESONANCE IMAGING Vol. 26 ( 10 ) page： 1374 - 1380 2008.12

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE INC

Purpose: This study discusses prominent signal intensity of T(1)/T(2) prolongation of subcortical white matter within the anterior temporal region in premature infant brains that radiologists may encounter when interpreting conventional screening MRIs.
Materials and Methods: T(1)- and T(2)-weighted images of 69 preterm and term infants with no neurological abnormalities or developmental delays were evaluated retrospectively for areas of prominent signal intensity of T(1)/T(2) prolongation in while matter. We measured signal intensities of anterior temporal white matter, deep temporal white matter, frontopolar white matter and subcortical white matter of the precentral gyrus. We accessed chronological changes in signal intensity in the anterior and deep temporal white matter. We also analyzed variance tests among the signal intensity ratios to the ipsilateral thalamus of white matter areas by gestational age.
Results: There was high frequency of prominent signal intensity of T(1)/T(2) prolongation in the temporal tip, particularly at a gestational age of 36-38 weeks. Signal intensity ratio of the anterior temporal white matter was lower on T(1)-weighted images and higher on T(2)-weighted images, and the finding became less prominent with increasing gestational age. The signal intensity ratios of anterior temporal white matter at a gestational age of 36-37 weeks and 38-39 weeks were significantly different from other regions.
Conclusion: Prominent signal intensity of T(1)/T(2) prolongation of subcortical white matter of the anterior temporal region is seen in normal premature infants, especially those at 36-39 gestational weeks. Although it is a prominent finding. radiologists Should understand that these findings do not represent a pathological Condition. (C) 2008 Elsevier Inc. All rights reserved.

DOI： 10.1016/j.mri.2008.04.014

Initial experience of using the filter protection device during carotid artery stenting in Japan (Radiation Medicine - Medical Imaging and Radiation Oncology (2008) 26, (348-354) DOI: 10.1007/s11604-008-0239-6)

Takayama K., Nakagawa H., Iwasaki S., Taoka T., Miyasaka T., Myouchin K., Wada T., Sakamoto M., Fukusumi A., Nakagawa I., Kurokawa S., Kichikawa K.

Radiation Medicine - Medical Imaging and Radiation Oncology Vol. 26 ( 8 ) page： 516 - 517 2008.10

Initial experience of using the filter protection device during carotid artery stenting in Japan.

Takayama K, Nakagawa H, Iwasaki S, Taoka T, Miyasaka T, Myouchin K, Wada T, Sakamoto M, Fukusumi A, Nakagawa I, Kurokawa S, Kichikawa K

Radiation medicine Vol. 26 ( 8 ) page： 516 - 7 2008.10

Initial experience of using the filter protection device during carotid artery stenting in Japan (vol 26, pg 348, 2008)

Takayama, K; Nakagawa, H; Iwasaki, S; Taoka, T; Miyasaka, T; Myouchin, K; Wada, T; Sakamoto, M; Fukusumi, A; Nakagawa, I; Kurokawa, S; Kichikawa, K

RADIATION MEDICINE Vol. 26 ( 8 ) page： 516 - 517 2008.10

Katsutoshi Takayama, Hiroyuki Nakagawa, Satoru Iwasaki, Toshiaki Taoka, Toshiteru Miyasaka, Kaoru Myouchin, Takeshi Wada, Masahiko Sakamoto, Akio Fukusumi, Ichiro Nakagawa, Shinichiro Kurokawa, Kimihiko Kichikawa

Radiation Medicine - Medical Imaging and Radiation Oncology Vol. 26 ( 8 ) page： 516 - 517 2008.10

Discriminating between silent cerebral infarction and deep white matter hyperintensity using combinations of three types of magnetic resonance images: a multicenter observer performance study Reviewed

Makoto Sasaki, Toshinori Hirai, Toshiaki Taoka, Shuichi Higano, Chieko Wakabayashi, Eiji Matsusue, Masahiro Ida

NEURORADIOLOGY Vol. 50 ( 9 ) page： 753 - 758 2008.9

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

Introduction We attempted to determine the most appropriate combination of magnetic resonance (MR) images that can accurately detect and discriminate between asymptomatic infarction and deep white matter hyperintensity (DWMH); these lesions have different clinical implications and are occasionally confused.
Materials and methods We performed an observer performance analysis using cerebral MR images of 45 individuals with or without asymptomatic small white matter infarction and/or mild DWMH who participated in a physical checkup program at four institutions. Six observers interpreted whether infarction and/or DWMH existed in combinations of two or three image types of the T1-weighted images (T1WI), T2-weighted images (T2WI), and fluid-attenuated inversion recovery (FLAIR) images. The observers' performance was evaluated with a receiver operating characteristic (ROC) analysis.
Results The averaged area under the ROC curve (Az) for detecting a infarction was significantly larger in the combination of all the three image types (0.95) than that in any combinations of the two image types (T1WI and FLAIR images, 0.87; T2WI and FLAIR images, 0.85; T1WI and T2WI, 0.86). The Az for detecting DWMH was significantly smaller in the combination of T1WI and T2WI (0.79) than that in other image combinations (T1WI and FLAIR, 0.89; T2WI and FLAIR, 0.91; T1WI, T2WI, and FLAIR, 0.90).
Conclusion The combination of T1WI, T2WI, and FLAIR images is required to accurately detect both small white matter infarction and mild DWMH.

DOI： 10.1007/s00234-008-0406-6

Diffusion tensor tractography of the Meyer loop in cases of temporal lobe resection for temporal lobe epilepsy: Correlation between postsurgical visual field defect and anterior limit of Meyer loop on tractography

T. Taoka, M. Sakamoto, H. Nakagawa, H. Nakase, S. Iwasaki, K. Takayama, K. Taoka, T. Hoshida, T. Sakaki, K. Kichikawa

AMERICAN JOURNAL OF NEURORADIOLOGY Vol. 29 ( 7 ) page： 1329 - 34 2008.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER SOC NEURORADIOLOGY

BACKGROUND AND PURPOSE: Visual field defects sometimes occur after temporal resection surgery. Our purpose was to evaluate the correlation between visual field defects caused by temporal lobe resection and the degree of resection of the Meyer loop, as assessed by diffusion tensor tractography.
MATERIALS AND METHODS: We examined 14 patients who underwent temporal resection for temporal lobe epilepsy. We obtained presurgical tractographies and then measured the distance between the temporal tip and the anterior limit of the Meyer loop (T-M distance). The degree of resection of the Meyer loop was defined as the distance from the anterior limit of the Meyer loop to the posterior limit of the temporal lobe resection (M-R distance). This was calculated by subtracting the T-M distance from the measured distance between the temporal tip and the posterior limit of the resection (T-R distance).
RESULTS: The mean T-M distance was 36.6 mm. The interindividual variation of the distance ranged from 30.0 to 43.2 mm. Although there was no statistically significant correlation between the extent of the visual field defect and the T-R distance, there was a statistically significant correlation between the degree of the visual field defect and the M-R distance.
CONCLUSION: The range of interindividual variation for the position of the Meyer loop was rather large, indicating that this variation is the key factor in visual field defects after temporal lobectomy, and the visual field defect appears to be predicted by presurgical tractography. Evaluation of the Meyer loop through the use of tractography seems to be a feasible method, which can be used to predict the visual field defect after temporal lobe resection.

DOI： 10.3174/ajnr.A1101

Initial experience of using the filter protection device during carotid artery stenting in Japan Reviewed

RADIATION MEDICINE Vol. 26 ( 6 ) page： 348 - 354 2008.7

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

Purpose. No filter protection devices for carotid artery stenting (CAS) have been formally approved for use in Japan; however, as of April 2008, the Angioguard XP (AGXP) was approved. This article describes our initial results using the AGXP during CAS for the treatment of carotid artery stenosis.
Material and methods. A group of 15 patients (14 men) with a mean age of 72.3 years (range 53-81 years) were treated by CAS using the AGXP. Among them, 10 were symptomatic with >50% stenosis of the common or internal carotid artery (ICA), and 5 were asymptomatic with >70% stenosis. The rates of technical success, peri-procedural stroke, ICA flow impairment, filter movement, and development of new ischemic lesions on diffusion-weighted imaging (DWI) were assessed.
Results. CAS using the AGXP was successful in all cases. There was one minor stroke, and flow impairment occurred in six patients. Filter movement averaged 1.9 vertebral bodies. DWI showed new ipsilateral ischemic lesions in eight of the patients.
Conclusion. Initial clinical experience using the AGXP for CAS has been generally sufficient. However, attention must be paid to three problems when using the AGXP: the filter may move after placement; the filter may disturb blood flow in the ICA; and debris may pass around the filter.

DOI： 10.1007/s11604-008-0239-6

Diffusion tensor tractography of posterior cingulum and cognitive tests in Alzheimer's disease Reviewed

K. Kiuchi, M. Morikawa, T. Taoka, S. Kitamura, K. Nagauchi, K. Norimoto, Y. Inoue, M. Inoue, K. Kichikawa, T. Kishimoto

PSYCHIATRY AND CLINICAL NEUROSCIENCES Vol. 62 ( 1 ) page： S4 - S4 2008.2

Multiple cerebral aneurysms associated with Takayasu arteritis successfully treated with coil embolization

Katsutoshi Takayama, Hiroyuki Nakagawa, Satoru Iwasaki, Toshiaki Taoka, Kaoru Myouchin, Takeshi Wada, Masahiko Sakamoto, Akio Fukusumi, Shinichiro Kurokawa, Kimihiko Kichikawa

RADIATION MEDICINE Vol. 26 ( 1 ) page： 33 - 38 2008.1

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

The cerebrovascular complications of Takayasu arteritis are primarily related to the presence of occlusive lesions. Cerebral aneurysms rarely occur as complications; only 18 cases have been reported thus far. The use of coil embolization to treat cerebral aneurysms occurring as a complication of Takayasu arteritis has not been previously reported. We report a case of Takayasu arteritis with a basilar tip aneurysm and a P1 segment aneurysm of the left posterior cerebral artery that were successfully treated with coil embolization. Because coil embolization for cerebral aneurysms associated with Takayasu arteritis requires the use of limited access routes that have extremely curved and tortuous courses, catheter navigation was difficult. The guide catheter, microcatheter, and guidewire must be selected and navigated with greater care than is usually required for common aneurysm embolization.

DOI： 10.1007/s11604-007-0184-9