FIGURE 7.

Comparison of the transformed atlas labels (before corrective segmentation) with and without using the bounding box detection. Three orthogonal and 3D rendering views of a target image volume are shown in (a). The transformed atlas labels in (b) based upon the bounding box show a better match to the target image cardiac structures compared to the labels in (c) created without using the bounding box. This improved match is due to improved multi-atlas selection and atlas-to-target image registration that are based upon a more restricted 3D region after the bounding box detection (see Fig. 5 and Fig. 6). Transformed labels of different cardiac structures are presented in different colors ― LV: left ventricular cavity, LA: left atrial cavity, LVM: left ventricular myocardium, RV: right ventricular cavity, RA: right atrial cavity, AA: ascending aorta, PA: pulmonary artery.