Electrical Capacitance Volume Tomography’s (ECVT) Sensitivity for breast phantom

    Dila Nelvo Dasril, MS Thesis, Dept. of Physics, University of Indonesia, 2014

    ECVT (Electrical Capacitance Volume Tomography) for breast imaging is an imaging technique that takes the advantage of electrical capacitance value. ECVT’s sensor used here is a half-ball shaped, consist of 24 triangular and trapezoidal electrodes. The sensor measure the value of electrical capasitance affected by permittivity distribution across the object, and then reconstructed to obtain probability image of inhomogen breast phantoms. This ECVT application research for biomedical imaging is done by making various breast phantoms. These phantoms have different shape, volume and object position. They have equivalent value with a real human breast tissue, glandular, and cancer tissue. Sensor characterization using LCRmeter shows that there is a contrast capacitance value between air and water on the level 2 sensor. ECVT reconstructed image result hasn’t been able to image the real anatomy of the phantom because the electricel field is inhomogen and not straight, so only level 2 sensor can be used for imaging. The result of determining ECVT sensitivity shows that the a and b ratio are closed to 1 for axial diameter on the 8th and 12th slice and for lateral direction on 16th slice, because they pass through the sensor’s main plane. ECVT image result that can be used for imaging is the image from the level 2 sensor by analizing the axial slice reconstructed image result.
    Keywords: ECVT, Breast Cancer, Image Reconstruction.