Browsing by Author "K. Jaruwongrungsee"

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    QCM based on flow system for cardiovascular disease
    (2009-12-01) K. Wong-Ek; O. Chailapakul; J. Prommas; K. Jaruwongrungsee; N. Nuntawong; A. Tuantranont; Chulalongkorn University; Mahidol University; Thailand National Electronics and Computer Technology Center
    Quartz Crystal Microbalance (QCM) is a special sensor which has acoustic impedance detector by mass loading. In this study Cardiac Troponin T (CTnT) which elevates in all patients with AMI diagnosed by World Heath Organization (WHO) criteria is used as immunoligical assay onto sensor. Detection of the Troponin T is developed based on antigen - antibody system on QCM sensor as solid support and signal transduction for immobilization to monitor risk marker of myocardial infarction. To immobilize antibody, the sensor is functionalized with Polyvinyl chloride (PVC) doped COOH by spray coating technique. The modified sensor testing results can be given in short response time and a direct conversion of mass accumulation into a frequency shift representing a measurable electrical signal. The relationship between the Cardiac Troponin T concentration and the response current could be observed in the minimum concentration range at 5 ng/ml. © 2009 Springer-Verlag.
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    Ultrasonic diffraction tomography: The experimental result
    (2005-12-01) C. Pintavirooj; K. Jaruwongrungsee; W. Withayachumnankul; K. Hamamoto; S. Daochai; Faculty of Engineering; King Mongkut's Institute of Technology Ladkrabang; Tokai University; The Institute of Science and Technology for Research and Development, Mahidol University
    Diffraction tomography is a technique for imaging with acoustic fields. It takes advantage of the linearization process of the non-linear wave equation describing wave propagation in heterogeneous media. When the scattering effect is weak, one can invoke the Born or Rytov approximation and thus derive the generalized Fourier Slice Theorem to reconstruct the cross-section of the insonified object. Although diffraction tomography is a promising technology for medical application as it provides a quantitative ultrasonic image, its realization toward medical use is still far-to-go, this may be due to the complexity of the hardware involved. In this research we investigate a potential use of diffraction tomography for medical application by using a delicate-designed ultrasonic computerized tomographic system. The result of experiment investigation of diffraction tomography is very promising. Copyright UNION Agency - Science Press.