FILIPIK, Adam, Jiří JAN and Igor PETERLÍK. Time-of-Flight Based Calibration of an Ultrasonic Computed Tomography System. Radioengineering. PRAHA: SPOLECNOST PRO RADIOELEKTRONICKE INZENYRSTVI, 2012, vol. 21, No 1, p. 533-544. ISSN 1210-2512.
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Basic information
Original name Time-of-Flight Based Calibration of an Ultrasonic Computed Tomography System
Authors FILIPIK, Adam (203 Czech Republic), Jiří JAN (203 Czech Republic) and Igor PETERLÍK (703 Slovakia, belonging to the institution).
Edition Radioengineering, PRAHA, SPOLECNOST PRO RADIOELEKTRONICKE INZENYRSTVI, 2012, 1210-2512.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 20206 Computer hardware and architecture
Country of publisher Netherlands
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 0.687
RIV identification code RIV/00216224:14330/12:00080255
Organization unit Faculty of Informatics
UT WoS 000303135600023
Keywords in English Ultrasonic computed tomography; ultrasonic transmission tomography; calibration of sensors; nonlinear optimisation; time-of-flight measurements
Changed by Changed by: RNDr. Pavel Šmerk, Ph.D., učo 3880. Changed: 22/5/2015 06:45.
Abstract
The paper presents a novel method for calibration of measuring geometry and of individual signal delays of transducers in ultrasonic computed tomography (USCT) systems via computational processing of multiple time-of-flight measurements of ultrasonic (US) impulses. The positions and time-delay parameters of thousands of ultrasonic transducers inside the USCT tank are calibrated by this approach with a high precision required for the tomographic reconstruction; such accuracy cannot be provided by any other known method. Although utilising similar basic principles as the global positioning system (GPS), the method is importantly generalised in treating all transducer parameters as the to-be calibrated (floating) unknowns, without any a-priori known positions and delays. The calibration is formulated as a non-linear least-squares problem, minimizing the differences between the calculated and measured time-of-arrivals of ultrasonic pulses. The paper provides detailed derivation of the method, and compares two implemented approaches (earlier calibration of individual transducers with the new approach calibrating rigid transducer arrays) via detailed simulations, aimed at testing the convergence properties and noise robustness of both approaches. Calibration using real US signals is described and, as an illustration of the utility of the presented method, a comparison is shown of two image reconstructions using the tomographic US data from a concrete experimental USCT system measuring a 3D phantom, without and after the calibration.
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