Share Email Print
cover

Proceedings Paper

Alignment and calibration of high frequency ultrasound (HFUS) and optical coherence tomography (OCT) 1D transducers using a dual wedge-tri step phantom
Author(s): N. Afsham; K. Chan; L. Pan; S. Tang; R. N. Rohling
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

This paper introduces a novel alignment and calibration method for high frequency ultrasound (HFUS) and optical coherence tomography (OCT) 1D transducers. 2D images are constructed by means of translation of the transducers using a linear motor stage. Physical alignment of the transducers is needed in order to capture images of the same crosssectional plane, and calibration is needed to determine the relative coordinates of the images, including the image skew. A dual wedge-tri step phantom is created for both alignment and calibration. This phantom includes two symmetrical wedges and three steps that provide the user with visual feedback on how well the scan plane is aligned with the midplane of the phantom. The phantom image consists of five line segments, each of which corresponds to one of the wedges or steps. The slopes and positions of the lines are extracted from the image and compared with the phantom model. The scan plane parameters are found so that the difference between the model and extracted features is minimized. The main advantage of this phantom is that only one frame is required to determine translations, orientations, and skew parameters of the scan plane with respect to the phantom. Experimental results with ocular imaging show the ability to achieve alignment based on this method and its potential for medical applications.

Paper Details

Date Published: 2 March 2011
PDF: 8 pages
Proc. SPIE 7964, Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling, 796428 (2 March 2011); doi: 10.1117/12.878182
Show Author Affiliations
N. Afsham, The Univ. of British Columbia (Canada)
K. Chan, The Univ. of British Columbia (Canada)
L. Pan, The Univ. of British Columbia (Canada)
S. Tang, The Univ. of British Columbia (Canada)
R. N. Rohling, The Univ. of British Columbia (Canada)


Published in SPIE Proceedings Vol. 7964:
Medical Imaging 2011: Visualization, Image-Guided Procedures, and Modeling
Kenneth H. Wong; David R. Holmes, Editor(s)

© SPIE. Terms of Use
Back to Top