PMC3943567_01
PMC3943567_02
Results of the clinical case in which tracked B-mode was used to localize a tumor border. Coronal and axial views are provided for no correction (a, b), rigid correction (c, d) and model correction (e, f), with the segmented tumor contour in red and the tomogram tumor volume in green. The segmented tumor surface in each B-mode slice is outlined for comparison with the magnetic resonance image tumor surface.
nihms-540496-f0008.jpg
PMC3943567_03_nihms-540496-f0008.jpg
F8
The results of the clinical case indicated a clear improvement in alignment between the tracked B-mode tumor and MR tumor borders, as illustrated in Figures 8 and 9. The model-based correction did offer a large improvement to alignment, especially along the region of the tumor closest to the surface, as illustrated Figure 8(d, f).
Alignment error results for the clinical case (n = 118 B-mode images). The position of tumor borders was evaluated in terms of modified Hausdorff distance to the co-aligned magnetic resonance image borders (a), as well as the distance between the centroid of the ultrasound tumor and the co-planar MR tumor border (b). The edges of the boxes are the 25th and 75th percentiles, and the whiskers extend to the most extreme data points not considered as outliers.
nihms-540496-f0009.jpg
PMC3943567_03_nihms-540496-f0009.jpg
F9
The results of the clinical case indicated a clear improvement in alignment between the tracked B-mode tumor and MR tumor borders, as illustrated in Figures 8 and 9. It is possible that there was some quantifiable amount of brain shift before the ultra-sound acquisition, which would directly affect our correction method and could be reflected in the error metrics reported in Figure 9.
PMC3943567_03
Results of the clinical case in which tracked B-mode was used to localize a tumor border. Coronal and axial views are provided for no correction (a, b), rigid correction (c, d) and model correction (e, f), with the segmented tumor contour in red and the tomogram tumor volume in green. The segmented tumor surface in each B-mode slice is outlined for comparison with the magnetic resonance image tumor surface.
nihms-540496-f0008.jpg
PMC3943567_03_nihms-540496-f0008.jpg
F8
The results of the clinical case indicated a clear improvement in alignment between the tracked B-mode tumor and MR tumor borders, as illustrated in Figures 8 and 9. The model-based correction did offer a large improvement to alignment, especially along the region of the tumor closest to the surface, as illustrated Figure 8(d, f).
Alignment error results for the clinical case (n = 118 B-mode images). The position of tumor borders was evaluated in terms of modified Hausdorff distance to the co-aligned magnetic resonance image borders (a), as well as the distance between the centroid of the ultrasound tumor and the co-planar MR tumor border (b). The edges of the boxes are the 25th and 75th percentiles, and the whiskers extend to the most extreme data points not considered as outliers.
nihms-540496-f0009.jpg
PMC3943567_03_nihms-540496-f0009.jpg
F9
The results of the clinical case indicated a clear improvement in alignment between the tracked B-mode tumor and MR tumor borders, as illustrated in Figures 8 and 9. It is possible that there was some quantifiable amount of brain shift before the ultra-sound acquisition, which would directly affect our correction method and could be reflected in the error metrics reported in Figure 9.