Experimental investigation of a diffraction tomography technique in fluid ultrasonics

Abstract

Qualitative ultrasonic imaging of cylindrical fluid targets is investigated by a diffraction tomography technique applied to experimental data. The principles of the image formulation are stated and an experimental setup is described. Experimental difficulties related to the short wavelength used and respective advantages in collecting the data, either with a mechanically scanned single transducer or with an electronically scanned array of transducers, are emphasized. Representative images of simply structured phantoms and of real biological bodies are obtained in spite of the small number of views available.

Unified reconstruction theory for diffraction tomography, with consideration of noise control

“…According to the generalized central-slice theorem [Eq. (8)], M( m , ) is equal to the 2D Fourier transform of a(r ជ ) along a semicircle, as shown in Fig. 2(b).…”

“…[1][2][3][4] This technique has attracted much attention in the past two decades because of its great potential for wide application in different scientific disciplines, ranging from medical imaging to geophysics. [5][6][7][8][9][10][11] For example, there has been increasing interest in the application of ultrasound diffraction tomography to breast tissue imaging. 12,13 Unlike the x rays in computed tomography (CT), which travel in a straight line, the radiation in diffraction tomography has to be treated in terms of wave fronts and fields scattered by inhomogeneities in the object.…”

Beam profiling by vibrating knife edge: Implications for near‐field optical scanning microscopy

“…In the language of tomography, Z(x,) is now a projection, and by measuring many such projections, each with the object slightly rotated in the xy plane, the entire image could in principle be computer-reconstructed [35].…”

Estimation of object location from short pulse scatter data

“…This approach has led to an expanded discipline within the regime of tomography, known as Diffraction Tomography (DT), which has reached today the stage of building prototype commercial tomographic scanners for biomedical [17,18,29,28,19,27,30,32] and underground [35,37,25,36,34,33] imaging systems based on the algorithms of the linearized version of the IS problem. Despite the success of the linearized algorithms in several practical applications, their success depends critically on the two assumptions of linearity and availablity of multiple experiments.…”