EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-34953) pertaining to the Miravant Medical Technologies 401(k)-Employee Stock Ownership Plan of our report dated June 25, 2004, with respect to the financial statements and schedules of the Miravant Medical Technologies 401(k)-Employee Stock Ownership Plan included in this Annual Report (Form 11-K) for the year ended December 31, 2003. /s/ ERNST & YOUNG LLP Woodland Hills, California June 25, 2004