Speaker
Ms
Khaing Nyunt Myaing
(U Chit Khe, Myanmar)
Description
With wide industrial application, computerized tomography CT is rapidly developing technique
that is especially useful for imaging and measuring multi-component and multiphase processes. The most
important contribution of CT is to greatly improve abilities to distinguish regions with different gamma ray
transmittance and to separate over-lying structures. The CT system of single source and detector gamma
transmission tomography GORBIT, designed by CANTI, Vietnam, was used to analyze the different
density materials. Hardware of the GORBIT CT system consists of two servo motors, data logger,
computer, a radiation source and a radiation detector. The measurements in GORBIT system were carried
out at the CT Laboratory in Department of Atomic Energy, Yangon. This tomography system operates
with a gamma ray source of 60Co1.85 GBq (50 mCi of intensity) and a NaI(Tl) scintillation detector.
Measured gamma transmitted data were used to reconstruct the cross-sectional images of research samples.
These images were reconstructed from the measured transmitted data in different image reconstructions
algorithms. Analytical methods of back projection (BP), the filtered back projection method (FBP) and
iterative algorithms of algebraic reconstruction method (ART) and estimation maximizations (EM)
methods were used in i-GORBIT image reconstruction software. Another image reconstruction program
GCTS was created by using MATLAB package. In this image reconstruction, different algorithms of back
projection (BP) and filtered back projection (FBP) were used. In FBP method, different filters of Ram-lack
filter, Sheep-Logan, Hamming, Hann and Cosine filter can be chosen and different interpolation methods
can be applied to improve the quality of images. The results of different image reconstructions programs
were compared and analyzed for the sample materials. In this research work we will present some results
obtained by using tomographic techniques to analyze various samples to check the distribution of various
density materials. These samples are made by using different properties of materials with high and low
density materials of lead, ion, six holes brick, polymer slab contained in a polymer pipe vessel. These
samples are also used to verify the outcome from the CT analysis with different image reconstructions
programs i-GORBIT and MATLAB.
Keywords: Industrial Gamma ray computed tomography, transmission measurement, image
reconstruction algorithms, MATLAB, linear attenuation coefficients
| Country/Organization invited to participate | Myanmar |
|---|
Primary author
Ms
Khaing Nyunt Myaing
(U Chit Khe, Myanmar)
