Development of realistic high-resolution whole-body voxel models of Japanese adult males and females of average height and weight, and application of models to radio-frequency electromagnetic-field dosimetry

Nagaoka, Tomoaki; Watanabe, Soichi; Sakurai, Kiyoko; Kunieda, Etsuo; Watanabe, Satoshi; Taki, Masao; Yamanaka, Yasumitsu

doi:10.1088/0031-9155/49/1/001

Cited by 633 publications

(336 citation statements)

References 19 publications

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“…1, together with their dimensions in Table 1. Whole-body voxel phantoms for a Japanese adult male and a Japanese adult female were developed by Nagaoka et al [13]. Volunteers were selected whose dimensions were close to the average values of Japanese.…”

Section: Computational Phantomsmentioning

confidence: 99%

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Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Hirata¹,

Sugiyama²,

Fujiwara³

2009

PIER

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Abstract-Biological effects due to whole-body radio-frequency exposure may be induced by core temperature elevation. According to the international safety guidelines/standards for human protection, the whole-body averaged specific absorption rate (WBA-SAR) is used as a metric. In order to understand the relationship between WBA-SAR and core temperature elevation, a theoretical solution or a closed formula for estimating core temperature elevation is essential. In the present study, we derived a formula for simply estimating core temperature elevation in humans and animals due to whole-body radio-frequency exposure. The core temperature elevation estimated with the formula is found to be in reasonable agreement with the computational results of finite-difference timedomain computation incorporated in anatomically-based models Based on the formula, the WBA-SAR is found to be a good metric for estimating core temperature elevation. The main factors influencing the core temperature elevation are the perspiration rate and the body surface area-to-weight ratio.

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Section: Computational Phantomsmentioning

confidence: 99%

“…The difference between (13) and (14) is that an effective heat transfer coefficient was introduced for the surface area of the human body model, since the area of the body that is close to the internal air is difficult to define. The surface area integral of the heat transfer coefficient in (13) can be estimated from [33].…”

Section: Formula Derivationmentioning

confidence: 99%

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Hirata¹,

Sugiyama²,

Fujiwara³

2009

PIER

View full text Add to dashboard Cite

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“…Mobile phones could be classified into four categories assuming normal use condition as cheek position with antenna extracted: (1) flip/flop phones of both 800-MHz and 1.5-GHz band with an antenna in the centre; (2) flip/flop phones of 800-MHz band with an antenna on the top; (3) 1.5-GHz band phones with an antenna on top; and (4) straight phones of 800-MHz band with an antenna on top. On the basis of this finding, a hypothetical threedimensional SAR distribution was constructed for each category of mobile phone on the above head model, Japanese numerical TARO model's head (Nagaoka et al, 2004). First, we estimated threedimensional SAR distribution for each phone in TARO model's head with the measured SAR data (Wake et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…The study followed the common, core protocol of the INTERPHONE study, but for estimating RF exposure level in different areas of the brain in light of its great variability, we adopted a new approach using a heterogeneous head model (Japanese numerical TARO model's head) (Nagaoka et al, 2004).…”

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confidence: 99%

Mobile phone use, exposure to radiofrequency electromagnetic field, and brain tumour: a case–control study

et al. 2008

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In a case -control study in Japan of brain tumours in relation to mobile phone use, we used a novel approach for estimating the specific absorption rate (SAR) inside the tumour, taking account of spatial relationships between tumour localisation and intracranial radiofrequency distribution. Personal interviews were carried out with 88 patients with glioma, 132 with meningioma, and 102 with pituitary adenoma (322 cases in total), and with 683 individually matched controls. All maximal SAR values were below 0.1 W kg À1 , far lower than the level at which thermal effects may occur, the adjusted odds ratios (ORs) for regular mobile phone users being 1.22 (95% confidence interval (CI): 0.63 -2.37) for glioma and 0.70 (0.42 -1.16) for meningioma. When the maximal SAR value inside the tumour tissue was accounted for in the exposure indices, the overall OR was again not increased and there was no significant trend towards an increasing OR in relation to SAR-derived exposure indices. A non-significant increase in OR among glioma patients in the heavily exposed group may reflect recall bias. British Journal of Cancer (2008) The rapid increase in mobile phone use has raised public concern about their safety (Rothman et

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“…The average height and body mass of Japanese 18 to 30 years old are 171.4 cm and 63.3 kg [27]. A study of 4243 women in the United States of America [28] suggests that body mass and BMI tend to increase until around the age of 50 and subsequently decrease as shown in Table 7.…”

Section: Body Shape Visualisation Using Mesh Deformationmentioning

confidence: 99%

Parametric model of human body shape and ligaments for patient-specific epidural simulation

Vaughan

Dubey

Wee

et al. 2014

Artificial Intelligence in Medicine

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Objective: This work builds upon the concept of matching a person's weight, height and age to their overall body shape to create an adjustable three-dimensional model. A versatile and accurate predictor of body size and shape and ligament thickness is required to improve simulation for medical procedures. A model which is adjustable for any size, shape, body mass, age or height would provide ability to simulate procedures on patients of various body compositions.Methods: Three methods are provided for estimating body circumferences and ligament thicknesses for each patient. The first method is using empirical relations from body shape and size. The second method is to load a dataset from a magnetic resonance imaging scan (MRI) or ultrasound scan containing accurate ligament measurements. The third method is a developed artificial neural network (ANN) which uses MRI dataset as a training set and improves accuracy using error back-propagation, which learns to increase accuracy as more patient data is added. The ANN is trained and tested with clinical data from 23088 patients. Results:The ANN can predict subscapular skinfold thickness within 3.54mm, waist circumference 3.92cm, thigh circumference 2.00cm, arm circumference 1.21cm, calf circumference 1.40cm, triceps skinfold thickness 3.43mm. Alternative regression analysis method gave overall slightly less accurate predictions for subscapular skinfold thickness within 3.75mm, waist circumference 3.84cm, thigh circumference 2.16cm, arm circumference 1.34cm, calf circumference 1.46cm, triceps skinfold thickness 3.89mm.for male or female patients aged 8-85. These calculations are used to display a 3D graphics model of the patient's body shape using OpenGL and adjusted by 3D mesh deformations. Conclusions:A patient-specific epidural simulator is presented using the developed body shape model, able to simulate needle insertion procedures on a 3D model of any patient size and shape.The developed ANN gave the most accurate results for body shape, size and ligament thickness.The resulting simulator offers the experience of simulating needle insertions accurately whilst allowing for variation in patient body mass, height or age.

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Development of realistic high-resolution whole-body voxel models of Japanese adult males and females of average height and weight, and application of models to radio-frequency electromagnetic-field dosimetry

Cited by 633 publications

References 19 publications

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Estimation of Core Temperature Elevation in Humans and Animals for Whole-Body Averaged Sar

Mobile phone use, exposure to radiofrequency electromagnetic field, and brain tumour: a case–control study

Parametric model of human body shape and ligaments for patient-specific epidural simulation

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