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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: J Cardiovasc Electrophysiol. 2009 Dec 15;21(5):557–563. doi: 10.1111/j.1540-8167.2009.01664.x

Fig. 4.

Fig. 4

Examples of raw and normalized ARFI images and of the human and machine determined lesion boundaries. Each row contains images for a separate lesion. Column (a) is the maximum ARFI-induced displacement image overlaid onto the photograph of the lesion cross-section. Column (b) is the depth normalized ARFI image overlaid onto the cross-section photograph. Column (c) shows the lesion boundary traces as determined by a manual segmentation based on the digital image (black) and the automatic ARFI imaging segmentations based on the optimal (blue) and standardized (green) thresholds. Lesions 1 and 2 were imaged with the custom 128-element AcuNav™, while lesion 3 was imaged with a commercially available 64-element AcuNav™. The automatic threshold traces for lesion 3 are identical and overlap. The color bar units in column (a) are μm displacement away from transducer; in column (b) the colors represent the fraction of the maximum displacement at a given depth.