Visceral fat inspection method based on the ultrasound tomographic reconstruction of abdominal tissue sound speed image
Project/Area Number |
22560414
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Measurement engineering
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Research Institution | Tokyo University of Agriculture and Technology |
Principal Investigator |
YAMADA Akira 東京農工大学, 工学(系)研究科(研究院), 教授 (20159213)
|
Project Period (FY) |
2010 – 2012
|
Project Status |
Completed (Fiscal Year 2012)
|
Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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Keywords | 計測システム / 音波トモグラフィ / 内蔵脂肪検査 / 超音波腹部スキャナー / 腹部断面音速分布映像 / 超音波CT / 超音波画像診断 / 超音波トモグラフィ / 医用超音波画像診断 / 内蔵脂肪症診断 / 音波伝搬時間測定 / 生体組織音速の映像化 / 計算機画像再構成 / 人体腹部断面の可視化 / 生体弾性物理量計測 / 内臓脂肪症(メタボリック症)診断 / 生体組織音速分布の映像化 / 生体弾性物理量の非侵襲計測 |
Research Abstract |
In the present study, investigations and validation experiments were made for the realization of acoustic tomographic visceral fat inspection apparatus based on the observation of ultrasound time of flight data around human abdominal surface. In particular, mechanical scanning system using a facing pair of high sensitivity broad band piezoelectric transducers in low frequency range was developed, so that waves propagated through the long distant intestinal gaseous medium can be detected without suffering sound attenuation. In addition, urethane gel hemi-spheres were attached in front of the transducers to keep good contact between transducer and body surface, regardless of contact angles between them. The facing pair transducers attached on the automated actuator stages for the movement of rotation (720 mm in diameter), translation (600 mm stroke), and pushing (300 mm stroke) were controlled by the computers to move to arbitral positions on the abdominal body surface. On this occasion,
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to minimize the loss of data caused by the avoidance of sound propagation paths intersecting a spine, propagation path was determined so that center of scanning rotation was adjusted to the spine. To this end, contour of the body surface was measured by laser range sensor and spine position was estimated in advance. By this means, the paths were adaptively determined in accordance with patient’s body size and sitting position. In addition, amplitudes of the sound waves were monitored so that contact condition can be controlled at an optimalpushing position regardless of the deviation of the premeasured body surface position. Finally, from the evaluation experiments by using the phantom specimen, it was shown that the measured precision of time of flight data were good enough to reproduce the abdominal sound speed cross sectional profile image. In addition, validity of the proposed visceral fat measurement techniques was confirmed from the results that fat areas can be clearly discriminated from the remaining protein areas with high degree of accuracy. Although the evaluation experiments for human patients were remained as future work, the system was brought to completion which can automatically collect the sound wave data around body surface andmeasure the visceral fat area from the abdominal reconstructed sound speed image. Less
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Report
(4 results)
Research Products
(16 results)