2021 Fiscal Year Annual Research Report
ウェアラブルEITと機械学習の融合技術による胃の高速・高精度イメージング
| Project/Area Number |
21F21356
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| Allocation Type | Single-year Grants |
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| Research Institution | Chiba University |
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Principal Investigator |
武居 昌宏 千葉大学, 大学院工学研究院, 教授 (90277385)
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| Co-Investigator(Kenkyū-buntansha) |
DARMA Panji Nursetia 千葉大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2021-11-18 – 2024-03-31
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| Keywords | Gastric phantom / 3D gastric EIT / Image Reconstruction / Machine Learning |
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| Outline of Annual Research Achievements |
1.The electrically equivalent gastric arm phantom of gEIT to detect the 2D and 3D gastric conductivity distribution has been developed. 2.In order to imaging gastric conductivity distribution, we developed several methods: a) Gastric EIT (gEIT) by 3D Jacobian Matrix and Dual-step Fuzzy Clustering Post Processing Method (Under Review on IEEE Sensors Journal) / b) Epigastric Region (ER) Conductivity Investigation with K-Means Clustering by a Low Power and Handy Gastric Monitoring System (Under Review on Measurement Science and Technology Journal)
Published Paper: During this term, 4 international peer-review journal, 1 invited lecturer and 4 international conference have been published. Most of them, related with development of the image reconstruction and evaluation method to improve the quality of EIT reconstruction such as : (a)Full 3D Jacobian Matrix, (b)Dual-step Fuzzy-Clustering, (c)otsu EIT soft thresholding method, (d)inhomogeneous Jacobian matrix, (e)ilerative linear back projection using optimized L-Curve method, (f)Quasi-3D EIT, (g)sensitive margin of frequency different EIT, (h)optimal voltage intensity for EMS-EIT, (i)Dua-Planar EIT electrode arrangement, (j)Quasi 3D Ultrasound Images
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We are developing gastric EIT Suit. The gEIT Suit consist of elastic cloth, electrodes holder, electrodes connector (white colour) and electrodes (grey colour). The elastic cloth composed of 88% polyester and 12% polyurethane material with initial width 40 [cm] and height 66 [cm], when the elastic cloth is stretched the maximum width 56 cm and maximum height 88 cm. The electrodes (E = 32) with radius 8 [mm] are attached across the elastic cloth on the abdomen surface to measure the Impedance Z. The electrodes are covered with electrode holder α with radius1 [cm] made by Poly Lactic Acid (PLA) material to fix the electrode position on elastic cloth surface. Furthermore, the electrode connector β with radius 2 [mm] is attached on the centre of electrode holder to connect the electrodes with compact gEIT DAQ cables.
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| Strategy for Future Research Activity |
This year will be planned to implement the stage (2) Development of gastric conversion model. The research plan are:
(a) Development of pH conversion model Debye-Huckel-Onsager formula,
(b) Development of Gastric accommodation flow rate conversion model (Q) based on Rehm osmotic theory of ion production inside stomach.
The gastric relative pH and accommodation flowrate from conversion model are evaluated with conventional ambulatory pH and IGB by using quantitative parameter such as 3D position difference, volumetric flowrate), time difference of measured impedance under normal condition and FD stimulation condition by drinking reflux acid mimic solutions in abdomen phantom and 25 voluntary healthy subjects under normal condition and FD stimulation condition by drinking reflux acid mimic solutions using gEIT developed in Stage I. In this stage, big data of FD condition is fulfilled by considering new data from healthy subjects
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