A review of computerized tomography with application to two-phase flows

Munshi, P.

doi:10.1007/bf02753697

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…Measurement of the attenuation along many different paths through the domain can be combined with linear tomographic reconstruction methods to produce an image of the phase distribution in the domain. GDT has been used for some time to investigate multiphase flows, and Munshi (1990), Beck et al (1993), and Simons (1995) provide comprehensive reviews of the technique. GDT requires that the two phases have signillcantly different attenuation coefficients for good image resolution or useful quantitative results.…”

Section: The Sandia Gdt Systemmentioning

confidence: 99%

Quantitative tomographic measurements of opaque multiphase flows

George¹,

Torczynski²,

Shollenberger³

et al. 2000

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Section: The Sandia Gdt Systemmentioning

confidence: 99%

Quantitative tomographic measurements of opaque multiphase flows

George¹,

Torczynski²,

Shollenberger³

et al. 2000

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“…been used for some time to investigate multiphase flows, and comprehensive reviews are provided by Munshi (1990), Beck et al (1993 and Simons (1995). The spatial resolution of GDT systems can be very h e (< 1 mm).…”

Section: Sandid Is a Multipropm Laboraton O P T D Bymentioning

confidence: 99%

Advanced Material Distribution Measurement in Multiphase Flows: A Case Study

et al. 1998

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A variety of tomographic techniques that have been applied to multiphase flows are described. The methods discussed include electrical impedance tomography (EIT), magnetic resonance imaging (MRI), positron emission tomography (PET), gamma-densitometry tomography (GDT), radiative particle tracking (RDT), X-ray imaging, and acoustic tomography. Also presented is a case study in which measurements were made with EIT and GDT in two-phase flows. Both solid-liquid and gas-liquid flows were examined. EIT and GDT were applied independently to predict mean and spatially resolved phase volume fractions. The results from the two systems compared well.

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“…Computerized tomography (CT) is an extremely powerful non-invasive technique having tremendous applications in basic/applied sciences and engineering [1]. The common feature in all these applications is the search for a solution to an inverse problem where a given property of a system (e.g.…”

Section: Introductionmentioning

confidence: 99%

Modified Polar Grid-based Accelerated Image Reconstruction Technique for X-ray CT

Chaudhary¹,

Wahi²,

Munshi³

2022

eJNDT

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Image reconstruction by projections is basically a mathematical problem. The speed and accuracy of the reconstruction mainly depend upon, (1) discretization scheme (2) solution technique. Solution by Algebraic Method (AM) is the most promising technique for manufacturing the low-cost (few detectors arrangement) X-ray CT set-up. Slow converging rate and huge memory requirement are the two major drawbacks of the AM algorithms. Projection coefficient calculations and their storages are major time and storage-consuming processes of the algebraic methods. Among all algebraic methods, the Multiplicative Algebraic Reconstruction Technique (MART) is more effective because it maximizes the entropy of the image space. The conventional MART algorithm uses square grids (SG) in the discretization process of the image reconstruction. In the present work, we employed a modified polar grid to cope with the shortcomings of the MART method. In this new discretization scheme, only the projection coefficients of the first view, need to be calculated. Projection coefficients for other views can be easily calculated by using the symmetries of the modified polar grid. This method significantly reduces the reconstruction time and storage requirement of the MART algorithm. In addition, we also presented the direct method of polar to square grid transformation for the visualization of the reconstructed images. We tested the proposed method to fan-beam geometry for 2D image reconstruction. Structural similarity index(SSIM) and L2 error are used for quality assessment of the reconstructed images.

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A review of computerized tomography with application to two-phase flows

Cited by 5 publications

References 22 publications

Quantitative tomographic measurements of opaque multiphase flows

Quantitative tomographic measurements of opaque multiphase flows

Advanced Material Distribution Measurement in Multiphase Flows: A Case Study

Modified Polar Grid-based Accelerated Image Reconstruction Technique for X-ray CT

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