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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Estimation of scattering object characteristics for image reconstruction using a nonzero background.

Jing Jin¹, Jeffrey Astheimer, Robert Waag

¹Department of Electrical and ComputerEngineering, University of Rochester, Rochester, NY, USA. waag@ece.rochester.edu

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|June 10, 2010

Summary

Accurate methods estimate object boundaries and sound speed using scattering data. These techniques work for circular and noncircular shapes, even when offset, providing reliable results for 2-D penetrable objects.

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Area of Science:

Acoustics
Wave Scattering
Computational Physics

Background:

Estimating object properties from scattering data is crucial in various fields.
Accurate boundary and sound speed determination is challenging for penetrable objects, especially when uncentered.

Purpose of the Study:

To develop and validate methods for estimating the boundary and average sound speed of 2-D penetrable objects.
To address challenges posed by object centering, shape, and absorption.

Main Methods:

Orthogonal function expansion for centered circular objects.
Cross-correlation and parabolic envelope for noncircular, convex objects.
Curve-fitting, phase-based, and extinction theorem methods for offset and absorption estimation.

Main Results:

Successful estimation of boundaries and average sound speed for both circular and noncircular objects.
Accurate correction for offset objects using curve-fitting and phase-based approaches.
Reliable estimation of absorption using the extinction theorem.

Conclusions:

The described methods provide accurate estimations of object boundaries, sound speeds, and absorption.
These techniques are robust for various object shapes and offsets when underlying assumptions are met.
The study validates the effectiveness of scattering-based inverse methods in characterizing penetrable objects.