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Spatial decomposition of the ultrasonic echo using a tomographic approach : Part A: The regularization method
One of the most common methods for making images with ultrasound is to use the pulse-echo method. Under the assumption of a homogeneous medium, the Time-of-flight (TOF), i.e.\ the time elapsed between transmission and reception of an ultrasonic pulse, is proportional to the distance. Methods for estimating the TOF assumes that the echoes only differ in arrival time. If the shape of the echo is dependent on where on the surface it is reflected, this method can yield an inaccurate image. One parameter of the ultrasonic transducer that could be used to improve this method is the {\em single point echo} (SPE), i.e. the echo from a point reflector. The direct measurement of this echo is however not possible due to practical problems and diffraction effects. In this report, we propose a method to experimentally determine the SPE. We use a tomographic approach where we can determine the SPE from a series of measured echoes from sliding halfplanes. ; Godkänd; 1994; 20080220 (ysko)
Spatial decomposition of the ultrasonic echo using a tomographic approach : Part A: The regularization method
One of the most common methods for making images with ultrasound is to use the pulse-echo method. Under the assumption of a homogeneous medium, the Time-of-flight (TOF), i.e.\ the time elapsed between transmission and reception of an ultrasonic pulse, is proportional to the distance. Methods for estimating the TOF assumes that the echoes only differ in arrival time. If the shape of the echo is dependent on where on the surface it is reflected, this method can yield an inaccurate image. One parameter of the ultrasonic transducer that could be used to improve this method is the {\em single point echo} (SPE), i.e. the echo from a point reflector. The direct measurement of this echo is however not possible due to practical problems and diffraction effects. In this report, we propose a method to experimentally determine the SPE. We use a tomographic approach where we can determine the SPE from a series of measured echoes from sliding halfplanes. ; Godkänd; 1994; 20080220 (ysko)
Spatial decomposition of the ultrasonic echo using a tomographic approach : Part A: The regularization method
Sandell, Magnus (author) / Grennberg, Anders (author)
1994-01-01
1994:12
Paper
Electronic Resource
English
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