A Closed-Form Differential Formulation for Ultrasound Spatial Calibration

  • Mohammad Najafi
  • Narges Afsham
  • Purang Abolmaesumi
  • Robert Rohling
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7330)


Purpose: Calibration is essential in tracked freehand 3D ultrasound (US) to find the spatial transformation from the image coordinates to the reference coordinate system. Calibration accuracy is especially important in image-guided interventions. Method: We introduce a new mathematical framework that substantially improves the US calibration accuracy. It achieves this by using accurate measurements of axial differences in 1D US signals of a multi-wedge phantom, in a closed-form solution. Results: We report a point reconstruction accuracy of 0.3 mm using 300 independent measurements. Conclusion: The measured calibration errors significantly outperform the currently reported calibration accuracies.


Ultrasound Image Calibration Technique Ultrasound Beam Translation Parameter Calibration Accuracy 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Mohammad Najafi
    • 1
  • Narges Afsham
    • 1
  • Purang Abolmaesumi
    • 1
  • Robert Rohling
    • 1
  1. 1.University of British ColumbiaVancouverCanada

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