/Get-ImageInfo /ImageFile: /Index: | /Name: Displays information about the images that the specified WIM or VHD file contains. ...

/Get-ImageInfo /ImageFile: [/Index: | /Name:] 

  Displays information about the images that the specified WIM or VHD file 
  contains. 

    Examples: 
      DISM.exe /Get-ImageInfo /ImageFile:C:\test\images\myimage.wim 
      DISM.exe /Get-ImageInfo /ImageFile:C:\test\images\myimage.vhd /Index:1