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Akimasa Hirata
Nagoya Institute of Technology
OpticsPhysicsElectronic engineeringElectric fieldSpecific absorption rate
434Publications
31H-index
2,820Citations
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Publications 465
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#1Akimasa HirataH-Index: 31
#2Sachiko KoderaH-Index: 4
Last. Essam A. RashedH-Index: 5
view all 4 authors...
This study analyzed the spread and decay durations of the COVID-19 pandemic in different prefectures of Japan. In Japan, in addition to affordable wide coverage health insurance systems, no medical collapse was observed, making accurate comparisons between prefectures possible. For the 19 prefectures included in this study that had daily maximum confirmed cases exceeding ten, the confirmed cases increased and decreased exponentially in the spread and decay durations in most of the prefectures. A...
#1Marom Bikson (CCNY: City College of New York)H-Index: 57
#2Colleen A. Hanlon (Wake Forest University)H-Index: 23
Last. Andrea Antal (GAU: University of Göttingen)H-Index: 55
view all 41 authors...
Abstract Background The COVID-19 pandemic has broadly disrupted biomedical treatment and research including non-invasive brain stimulation (NIBS). Moreover, the rapid onset of societal disruption and evolving regulatory restrictions may not have allowed for systematic planning of how clinical and research work may continue throughout the pandemic or be restarted as restrictions are abated. The urgency to provide and develop NIBS as an intervention for diverse neurological and mental health indic...
1 CitationsSource
The human dosimetry for electromagnetic field exposure is an essential task to develop exposure guidelines/standards for human safety as well as product safety assessment. At frequencies from a few 100 Hz to 10 MHz, the adverse effect to be protected is the stimulation of the peripheral nervous system. The in situ electric field in the skin is used as a surrogate of nerve activation. In the low-frequency dosimetry, a high but inaccurate in situ electric field has been reported at positions where...
Source
#1Jose Gomez-Tames (Nagoya Institute of Technology)H-Index: 7
#2Ilkka Laakso (Aalto University)H-Index: 19
Last. Akimasa Hirata (Nagoya Institute of Technology)H-Index: 31
view all 5 authors...
OBJECTIVE: Transcranial magnetic stimulation (TMS) activates brain structures non-invasively. Computational models can be used to elucidate the activation site; however, the exact activation site is controversial. The aim is to present an imaging technique of the TMS activation cortical site estimation using individualized multi-scale realistic head models based on experimentally-derived TMS fields. APPROACH: The induced electric field (EF) was computed using subject-specific head models and exp...
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#1Essam A. Rashed (Nagoya Institute of Technology)H-Index: 5
Last. Akimasa HirataH-Index: 31
view all 3 authors...
Radio-frequency dosimetry is an important process in human safety and for compliance of related products. Recently, computational human models generated from medical images have often been used for such assessment, especially to consider the inter-variability of subjects. However, the common procedure to develop personalized models is time consuming because it involves excessive segmentation of several components that represent different biological tissues, which limits the inter-variability ass...
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#1Jose Gomez-Tames (Nagoya Institute of Technology)H-Index: 7
#2Akihiro Asai (Nagoya Institute of Technology)H-Index: 1
Last. Akimasa Hirata (Nagoya Institute of Technology)H-Index: 31
view all 3 authors...
Abstract Objective Transcranial direct current stimulation (tDCS) is a neuromodulation scheme that delivers a small current via electrodes placed on the scalp. The target is generally assumed to be under the electrode, but deep brain regions could also be involved due to the large current spread between the electrodes. This study aims to computationally evaluate if group-level hotspots exist in deep brain regions for different electrode montages. Methods We computed the tDCS-generated electric f...
3 CitationsSource
#1Essam A. Rashed (Nagoya Institute of Technology)H-Index: 5
#2Jose Gomez-TamesH-Index: 7
Last. Akimasa HirataH-Index: 31
view all 3 authors...
Electro-stimulation or modulation of deep brain regions is commonly used in clinical procedures for the treatment of several nervous system disorders. In particular, transcranial direct current stimulation (tDCS) is widely used as an affordable clinical application that is applied through electrodes attached to the scalp. However, it is difficult to determine the amount and distribution of the electric field (EF) in the different brain regions due to anatomical complexity and high inter-subject ...
1 CitationsSource
#1Essam A. Rashed (Suez Canal University)H-Index: 5
Last. Akimasa HirataH-Index: 31
view all 6 authors...
The human dosimetry for electromagnetic field exposure is an essential task to develop exposure guidelines/standards for human safety as well as product safety assessment. At frequencies from a few hundred Hz to 10 MHz, the adverse effect to be protected is the stimulation of the peripheral nervous system. The in situ electric field in the skin is used as a surrogate of nerve activation. In the low-frequency dosimetry, a high but inaccurate in situ electric field has been reported at positions w...
#1Keisuke Tani (Hamamatsu University)H-Index: 1
#2Akimasa Hirata (Nagoya Institute of Technology)H-Index: 31
Last. Satoshi Tanaka (Hamamatsu University)H-Index: 21
view all 3 authors...
Objective: Transcranial magnetic stimulation (TMS) is commonly used in basic research to evaluate human brain function. Although scalp pain is a side effect, no studies have quantitatively assessed the TMS intensity threshold for inducing pain and whether sensitivity to TMS-induced pain differs between sexes. Methods: We measured pain thresholds when single-pulse TMS was applied over either Broca9s area (BA) or left primary motor cortex (M1). We compared these thresholds with motor threshold for...
1 CitationsSource
#2Daisuke FunahashiH-Index: 1
Last. Akimasa HirataH-Index: 31
view all 5 authors...
The relationship between skin temperature elevation and incident power density (IPD) from radio-frequency near-field exposure at 28 GHz for different angles of incidence is evaluated computationally in this study. The averaging scheme of the IPD is crucial for determining the maximum allowable exposure levels of wireless equipment to comply with certain standards/regulations. However, it is still unclear which component of the IPD (i.e., the norm or normal component to the human body) is more re...
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