Takayuki Oku

Yamaguchi University

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Takanori Masuda

Kawasaki University of Medical Welfare

Yoshinori Funama

Kumamoto University

Tomoyasu Sato

Hiroshima General Hospital

Kazuo Awai

Hiroshima University

Michiyasu Suzuki

Yamaguchi University

Takeshi Nakaura

Kumamoto University

Hideyuki Ishihara

Yamaguchi University

Masao Kiguchi

Hiroshima University Hospital

Shinichi Arao

Kawasaki University of Medical Welfare

Fumiaki Oka

Yamaguchi University

Cooperative Institutions

Yamaguchi University

Hiroshima University

Tsuchiura Kyodo General Hospital

Kumamoto University

Yamaguchi University Hospital

Kawasaki University of Medical Welfare

The University of Tokyo

Hiroshima General Hospital

Kyoto University

Kyushu University

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Intravascular ultrasound shows the detailed appearance of an unraveled coil identified on echocardiography

Journal of Echocardiography (2015)

Tatsuya Oonishi Kazuya Terada Takayuki Oku Keisuke Fukudome Yuichi Miyagi

Intravascular Ultrasound

Abdominal aorta

10.1007/s12574-015-0251-7

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DOSE Reduction Using High Pitch ECG-gated Helical Scan on the Pediatric Cardiac Volume CT

Takanori Masuda Yun Shen Tomoyasu Sato Naoyuki Imada Hiroya Asou

Poster: ECR 2011 / C-1134 / DOSE　Reduction　Using　High　Pitch　ECG-gated Helical Scan on the Pediatric Cardiac Volume CT by: Masuda1, Y. Shen2, T. Sato1, N. Imada1, H. Asou1, T. Oku1, T. Ishibashi1, Y. Matsumoto1; 1Hiroshima/JP, 2Tokyo/JP

Helical computed tomography

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Decreased Flow Velocity with Transcranial Color-Coded Duplex Sonography Correlates with Delayed Cerebral Ischemia due to Peripheral Vasospasm of the Middle Cerebral Artery

Journal of Stroke and Cerebrovascular Diseases (2016)

Hirokazu Sadahiro Satoshi Shirao Hiroshi Yoneda Hideyuki Ishihara Takayuki Oku

Transcranial Doppler

10.1016/j.jstrokecerebrovasdis.2016.05.032

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Comparison of the equivalent doses of the eye lenses, thyroid, and mammary gland among three pediatric and one adult anthropomorphic phantom during the chest CT examinations using a 40 mm volume helical scan

Radiation Protection Dosimetry (2024)

Takanori Masuda Masao Kiguchi Chikako Fujioka Takayuki Oku Toru Ishibashi

Abstract Equivalent doses for the eye lenses, thyroid, and mammary glands were measured and compared between one adult and three pediatric anthropomorphic phantoms during chest computed tomography (CT) using 40 mm volume helical scan on the Aquilion ONE GENESIS Edition CT equipment. Placing an optically stimulated luminescence dosemeter (OSLD) on the eye lenses, thyroid, and mammary gland, we measured and compared the equivalent dose of OSLD among different phantoms during chest CT using a helical scan. Compared with adults, the equivalent doses to the eye lens, thyroid, and mammary glands were ~81%, 77%, and 63% lower in newborns, 1-year-olds, and 5-year-olds using comparable image noise during chest CT.

Eye lens

10.1093/rpd/ncae165

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Evaluation of CT in the diagnosis of congenital choanal atresia

The Journal of Laryngology & Otology (1983)

Masahiro Hasegawa Takayuki Oku Hiroaki Tanaka I. Watanabe Shizuka Suzuki

Abstract A six-year-old female with congenital bilateral choanal atresia was examined by CT (computed tomography) and contrast radiography. CT clearly demonstrated the existence of choanal atresia, and differentiated osseous stenosis from membranous stenosis in the choanae. CT may be the first choice of radiological examination for the pre-operative diagnosis of congenital choanal atresia.

Choanal Atresia

10.1017/s0022215100095906

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Citations (18)

Influence of contrast enhancement at the contrast injection location for the arm or leg in neonatal and infant patients during cardiac computed tomography

Radiología (English Edition) (2022)

Takanori Masuda Yoshinori Funama Takeshi Nakaura Tomoyasu Sato Masahiro Tahara

Contrast Enhancement

10.1016/j.rxeng.2021.10.001

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Impact of beam collimation of z-overscanning on dose to the lens and thyroid gland in paediatric thoracic computed tomography imaging

Pediatric Radiology (2024)

Takanori Masuda Masao Kiguchi Chikako Fujioka Takayuki Oku Toru Ishibashi

Collimated light

Neuroradiology

10.1007/s00247-024-05862-3

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USE OF VACUUM MATTRESSES CAN REDUCE THE ABSORBED DOSE DURING PEDIATRIC CT

Radiation Protection Dosimetry (2021)

Takanori Masuda Yoshinori Funama Takeshi Nakaura Tomoyasu Sato Masahiro Tahara

Abstract To evaluate and compare the absorbed dose and image quality when applying a commercially produced fixation device (group A) and a vaccum mattress fixation device to pediatric patients (group B). We compared the absorbed dose and image noise between the groups at the phantom and clinical study. For phantom study, the measurement absorbed dose for a real time skin dosimeter was 3.0 mGy at the group A and 1.9 mGy at the group B (p < 0.05). For clinical study, computed tomography dose index product, dose-length and effective radiation dose were significantly lower with the group B compared to the group A, (3.4 mGy, 27.0 mGy-cm, and 2.2 mSv vs 4.4 mGy, and 36.7 mGy-cm, and 3.0 mSv), p < 0.05 for all comparisons. Compared to the commercially produced fixation device, the vaccum mattress fixation device composed of a less absorptive material enabled a reduction in the absorbed dose while maintaining the image quality during pediatric CT examinations.

10.1093/rpd/ncab102

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The Usefulness of the Intraoperative Monitoring of the Motor Evoked Potential (MEP) with D-wave in Aneurysm Surgery

Surgery for Cerebral Stroke (2008)

Masami Fujii Sadahiro Nomura Hirochika Imoto Hironobu TANAKA Takayuki Oku

Recently, intraoperative monitoring of the motor evoked potential (MEP) has become essential during aneurysm surgery to avoid the occurrence of motor deficit. The MEPs are commonly recorded from upper or lower limb muscles after electrical stimulation of the motor cortex. On the other hand, we monitor the MEPs recorded from the spinal cord at the cervical epidural space after the electrical stimulation of the motor cortex during aneurysm surgery. In this study, we describe the usefulness of corticospinal MEP monitoring in aneurysm surgery. Corticospinal MEPs were recorded in 31 patients during aneurysm surgery. Twenty-two patients had internal carotid artery aneurysms, including 12 ruptured aneurysms, and 17 patients had middle cerebral artery aneurysms, including 10 ruptured aneurysms. Preoperatively, an epidural lead for the MEP recording was inserted into the cervical epidural space under radiographic guidance and under general anesthesia with muscle relaxants. After craniotomy, a subdural grid was placed over the sensory and motor cortices and optimum contacts for the electrical stimulation were selected according to the waveforms of somatosensory evoked potentials. Corticospinal MEPs, which were elicited by cortical stimulation and consisted of a D-wave followed by 2 or 3 I-waves were recorded from an epidural lead (bipolar recording). Among these 31 patients, 11 (35.5%) had changes in MEPs. An amplitude reduction less than 50% of the control was observed in 6 patients. An amplitude augmentation of more than 50% was also observed in 5 patients. These MEP changes recovered to the control level after the release of temporary clip or reclipping of aneurysms. MEP monitoring thereby prevented motor deficits. Corticospinal MEPs were constantly recorded and they showed a sensitive response to the blood flow insufficiency of the arteries during aneurysm surgery. Corticospinal MEP monitoring is therefore considered to safely and effectively prevent motor deficits caused during aneurysm surgery.

Somatosensory evoked potential

Evoked potential

Intraoperative neurophysiological monitoring

Epidural space

10.2335/scs.36.373

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Citations (2)

Utilidad de la línea orbitomeatal superior sin incluir los cristalinos en la exploración con diferentes voltajes del tubo en la TC craneal pediátrica

Radiología (2023)

Takanori Masuda Yoshinori Funama Takeshi Nakaura Tomoyasu Sato Masao Kiguchi

10.1016/j.rx.2023.02.006

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