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                                                                   EXHIBIT 23.4
 
              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
Fluoroscan Imaging Systems, Inc.
Northbrook, Illinois
 
  We hereby consent to the use in the Prospectus constituting a part of this
Registration Statement of our report dated February 23, 1996, relating to the
consolidated financial statements of Fluoroscan Imaging Systems, Inc., which
is contained in that Prospectus.
 
  We also consent to the reference to us under the caption "Experts" in the
Prospectus.
 
                                          BDO Seidman, LLP
 
Chicago, Illinois
   
August 5, 1996     
