Modified time-of-flight based calibration approach for ultrasonic computed tomography
Modified time-of-flight based calibration approach for ultrasonic computed tomography
复制标题
改进的基于飞行时间的超声计算机断层扫描校准方法
DOI：
10.1109/iembs.2008.4649627
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
R. Jiřík
中科院分区：
文献类型：
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作者：
Adam Filipik;J. Jan;I. Peterlík;D. Hemzal;N. Ruiter;R. Jiřík
在先前的论文[11]中，已经描述了用于超声计算机断层扫描（USCT）系统的几何和换能器时间延迟自动校准的方法，旨在校准单个超声（US）换能器位置。本贡献描述了一种新的修改的方法，利用特定的USCT系统的概念：确切地知道的空间关系，在每个换能器阵列系统（TAS）中的换能器分组之间的方法。用于校准的算法仍然基于类似于全球定位系统（GPS）导航的原理，然而，校准完整TAS的位置和方向，而不是换能器的单独位置。这样，未知数的数量大大减少，而可用方程的数量保持不变。因此，基于该高度超定的方程系统，可以获得相对于测量噪声基本上更鲁棒的解。该方法能够在SC.空测量期间立即经由所有超声换能器在TAS中的位置以及它们的单独时间延迟来校准所有超声换能器的单独位置，而不需要任何特定布置，例如校准幻影。
In the previous paper [11], a method for geometrical and transducer-time-delay auto-calibration of an ultrasonic computed tomography (USCT) system has been described, aiming at calibration of individual ultrasonic (US) transducer positions. The present contribution describes a novel modification of the method utilizing the particular USCT system concept: the exactly known spatial relations among transducers grouped in each of the transducer array systems (TASes). The algorithms used for the calibration remain based on the principles similar to the global positioning system (GPS) navigation, however, the positions and orientations of complete TASes are calibrated, rather than individual positions of transducers. This way, the number of unknowns is substantially reduced while the number of available equations remains unchanged. Consequently, a solution substantially more robust with respect to measurement noise can be obtained based on this highly overdetermined equation system. The method is capable of calibrating the individual positions of all ultrasonic transducers via their positions in TASes as well as their individual time delays at once during sc. empty measurement, without a need for any particular arrangements, e.g. calibration phantoms.