(5) Modified the slider to update the slice images while it's being dragged; Modified the mask overlay code to not use a contour (runs a lot faster); Fixed a bug with the bounding box while segmenting the lungs or calculating SNR (it was not being deleted properly); Made many changes to the updateImagePanels code; Fixed a bug with the slider where the number of slices depended on the number of lung and body slices (it now depends on the number of slices in both panels instead)