Understanding Image Scale to Fit for breast images

The Image Scale to Fit tool scales images so that the breast fills the available viewport space. When applied, all images are displayed as large as possible, without cutting off any anatomical content. Images are not only scaled but are also panned out and registered so that the chest walls are fully visible, regardless of laterality or patient orientation. Image Scale to Fit can be applied manually at any time to a study or it can be made automatic using a display wizard.

Vertical centering of the breast is a function of patient positioning. Image adjustments can be made using the Pan tool to make any necessary corrections, which remain applied when navigating through Comparative Review Mode views. Pan adjustments are remembered when navigating through Comparative Review Mode views only when Image Scale to Fit is applied.

Scaling of images is limited as follows:

• All of the images in the current study are sent through a detection algorithm to determine the optimal magnification. Once optimal magnification is determined, it is applied to all images on screen (including any images from prior studies).

• Studies identified as magnification views are excluded from the calculations of the algorithm and do not have Image Scale to Fit or Same Size scaling applied to them. This mode of display is not intended for comparison of geometrically magnified views at the same time as non-magnified views.

• Views appearing as separate series dragged into view from the Available Series tray are scaled automatically if Image Scale to Fit is enabled.

• All visible tissue is included by the algorithm unless the tissue is separated from the breast by greater than 3 cm of space. If the algorithm detects a gap between the breast and chest wall along the vertical axis of more then 3 cm, the algorithm crops the chest from view, meaning, that tissue does not appear in the scaled view.

• Same Size scaling is applied on the optimal magnification determined by the breast detection algorithm, to ensure all displayed images remain at the same physical size on screen.