Development of a Japanese Adult Female Voxel Phantom

Sato, Kaoru; Noguchi, Hiroshi; Emoto, Yutaka; Koga, Sukehiko; Saitô, Kimiaki

doi:10.3327/jnst.46.907

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…Anatomical human phantoms are a key component in dosimetry studies investigating the absorption of electromagnetic fields in the human body in implant safety assessments [Beard et al, 2006;Hand, 2008]. With the exception of a few phantoms based on cryosection images [Ackerman, 1998;Kim et al, 2008], most of the available phantoms were derived from computational tomography or magnetic resonance imaging (MRI) scanning data [Zankl and Petoussi-Henss, 2002;Lee et al, 2004;Dimbylow, 2005;Sato et al, 2007;Zhang et al, 2007;Sato et al, 2009;Christ et al, 2010].…”

Section: Introductionmentioning

confidence: 99%

Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure

Yao

Zastrow

Cabot³

et al. 2019

Bioelectromagnetics

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The Virtual Population (ViP) phantoms have been used in many dosimetry studies, yet, to date, anatomical phantom uncertainty in radiofrequency (RF) research has largely been neglected. The objective of this study is to gain insight, for the first time, regarding the uncertainty in RF‐induced fields during magnetic resonance imaging associated with tissue assignment and segmentation quality and consistency in anatomical phantoms by evaluating the differences between two generations of ViP phantoms, ViP1.x and ViP3.0. The RF‐induced 10g‐average electric (E‐) fields, tangential E‐fields distribution along active implantable medical devices (AIMD) routings, and estimated AIMD heating were compared for five phantoms that are part of both ViP1.x and ViP3.0. The results demonstrated that differences exceeded 3 dB (−29%, +41%) for local quantities and 1 dB (±12% for field, ±25% for power) for integrated and volume‐averaged quantities (e.g., estimated AIMD‐heating and 10 g‐average E‐fields), while the variation across different ViP phantoms of the same generation can exceed 10 dB (−68% and +217% for field, −90% and +900% for power). In conclusion, the anatomical phantom uncertainty associated with tissue assignment and segmentation quality/consistency is larger than previously assumed, i.e., 0.6 dB or ±15% (k = 1) for AIMD heating. Further, multiple phantoms based on different volunteers covering the target population are required for quantitative analysis of dosimetric endpoints, e.g., AIMD heating, which depend on patient anatomy. Phantoms with the highest fidelity in tissue assignment and segmentation should be used, as these ensure the lowest uncertainty and possible underestimation of exposure. To verify that the uncertainty decreases monotonically with improved phantom quality, the evaluation of differences between phantom generations should be repeated for any improvement in segmentation. Bioelectromagnetics. 2019;40:458–471. © 2019 Bioelectromagnetics Society

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Section: Introductionmentioning

confidence: 99%

Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure

Yao

Zastrow

Cabot³

et al. 2019

Bioelectromagnetics

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The contemporary JAEA Japanese voxel phantoms

Sato

Takahashi

2011

Radiation Protection Dosimetry

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Average adult Japanese male (JM-103 phantom) and female (JF-103 phantom) voxel (volume pixel) phantoms were newly constructed by modifying the JM and JF phantoms previously developed at Japan Atomic Energy Agency. The JM-103 and JF-103 have average characteristics with respect to organ masses and body sizes. Their tissue segmentations were based on International Commission on Radiological Protection (ICRP) Publication 103. The anatomical and dosimetric characteristics of JM-103 and JF-103 were compared with those of ICRP adult reference male (AM phantom) and female (AF phantoms) phantoms. This study discusses their anatomical and dosimetric characteristics, and applications to the dose assessment of the atomic bomb survivors.

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Body and organ dimensions of the 1945 Japanese population used in dosimetry system DS86 and data available for an expanded series of phantoms

Cullings

Kawamura

Chen

2012

Radiation Protection Dosimetry

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The computational phantoms used in dosimetry system DS86 and re-used in DS02 were derived from models and methods developed at Oak Ridge National Laboratories (ORNL) in the US, but referred to Japanese anthropometric data for the Japanese population of 1945, from studies conducted at the Japanese National Institute of Radiological Sciences and other sources. The phantoms developed for DS86 were limited to three hermaphroditic models: infant, child and adult. After comparing data from Japanese and Western populations, phantoms were adapted from the pre-existing ORNL series, adjusting some organs in the adult phantom to reflect differences between Japanese and Western data, but not in the infant and child phantoms. To develop a new and larger series of more age- and sex-specific models, it appears necessary to rely on the original Japanese data and values derived from them, which can directly provide population-average body dimensions for various ages. Those data were re-analysed in conjunction with other Asian data for an Asian Reference Man model, providing a rather complete table of organ weights that could be used to scale organs for growth during childhood and adolescence. Although the resulting organ volumes might have some inaccuracies in relation to true population-average values, this is a minor concern because in the DS02 context organ size per se is less important than the correct body size and correct placement of the organ in the body.

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Development of a Japanese Adult Female Voxel Phantom

Cited by 5 publications

References 15 publications

Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure

Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure

The contemporary JAEA Japanese voxel phantoms

Body and organ dimensions of the 1945 Japanese population used in dosimetry system DS86 and data available for an expanded series of phantoms

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