A New Least Squares Based Calibration for an Ultrasound Tomography Scanner Using Radial Image Processing

In the context of the development of an ultrasound scanner where a probe turns around the part of the body to be studied, a new tomographic technique has been developed: the Ultrasound Reflection-mode Tomography Using Radial Image Processing (URTURIP Technique). This technique is used when a unique B-scan image is insufficient to correctly describe a cross-section. It utilises B-scan images obtained under different angles of view in the same plane to reconstruct a better cross-sectional image. Before using the URTURIP Technique, a calibration step is required to accurately determine the centre of rotation of the probe. To solve the calibration problem, a reference method has been developed, but it is very time-consuming. This paper presents a faster method based on a least squares fitting and is compared to the reference method in terms of accuracy and time-consuming.