Select frames in the DICOM File Import dialog box: Shift-click
to select contiguous frames, Ctrl-click (Windows) or Command-click
(Mac OS) to select noncontiguous frames, or click Select
All to select all frames.
Enter a prefix in the Prefix box in the Export Options
area.
Click Export Presentation (JPEG), select a folder, and
click Select.
The JPEG files are saved in the specified location
with the prefix added to the filenames. If you selected multiple
frames, Photoshop appends successive numbering to the end of each
filename (for example, DICOM Frame1, DICOM Frame2, DICOM Frame3).