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Fig. 3D. —Radiofrequency ablation thermal lesion in lobe of liver tissue encased in gelatin phantom. Sonographic images were obtained with 5-MHz linear transducer. Three-dimensional (3D) elastogram of thermal lesion was produced by reconstructing lesion from multiple 1-mm 2D elastograms obtained along parallel scanning planes. Surface and volume rendering of lesion is possible because of marked contrast in stiffness between lesion and surrounding normal tissue. To render lesion surface, we segmented 2D elastograms by setting a single threshold (strain value 90% below maximum strain surrounding thermal lesion) to separate background strains from lower strains in thermal lesion. With 3D representation, lesion volume can be calculated.

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