Record Details

Diffraction Tomographic Imaging With A Circular Array

Electronic Theses of Indian Institute of Science

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Field Value
 
Title Diffraction Tomographic Imaging With A Circular Array
 
Creator Vasuki, A
 
Subject Electrical Engineering
Optical Data Processing
Diffraction Tomography
Image Analysis
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Description In the conventional diffraction tomography a linear array is used to receive forward scattered field. Then a standard algorithm like back propagation or Fourier domain interpolation is used for reconstruction of the object. A circular array which captures both forward and backward scattered field has been proposed. A new theorem is proposed, which states that the scattered field measured with a large circular array surrounding the object is proportional to the Fourier transform of the object profile taken on the circumference of a circle of radius equa1 to the wave number and centered at (-k0 cosZO, -k0 sin Z0). The circular array outperforms in two counts. Firstly, a larger bandwidth of Fourier transform is used for reconstruction. Secondly, in circular array since the scattered field itself is related to the object Fourier transform, the reconstruction is free from the errors induced by finite array size. The effect of broad band illumination has been studied. A fewer number of illuminations appear to produce a reconstruction which is possible only with a large number of illuminations but narrow band illumination. Thus a trade off between the number of illumination angles and the bandwidth of the source exists.
 
Publisher Indian Institute of Science
 
Contributor Naidu, P S
 
Date 2005-06-02T06:06:00Z
2005-06-02T06:06:00Z
2005-06-02T06:06:00Z
1994-10
 
Type Electronic Thesis and Dissertation
 
Format 3332456 bytes
application/pdf
 
Identifier http://etd.iisc.ernet.in/handle/2005/119
null
 
Language en
 
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