Use the Web Compression Manager to delete a modality from the list of modalities if you no longer need to control the compression ratios of wavelet images for that modality.
To delete modality types from the compression list
On the Setup tab, click Web Compression Manager.
Beside the Modality list, click the + (plus sign).
From the Modality list, select the modality to delete.
Click Move Left.
To delete the contents of the field, click the Clear button on the left-hand side.
To return to the Web Compression Manager, click OK.