**Exhibit 31.1**

 

**CERTIFICATION**

 

I, Taffy J. Williams, Ph.D.,President and Chief Executive Officer, certify that:

 

1.             I have reviewed this quarterly report on Form 10-QSB ofIMCOR Pharmaceutical Co. (f/k/a Photogen Technologies, Inc.);

 

2.                                       Basedon my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.                                       Basedon my knowledge, the financial statements, and other financial informationincluded in this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the small business issuer asof, and for, the periods presented in this report;

 

4.                                       Thesmall business issuer’s other certifying officer and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for thesmall business issuer and have:

 

(a)           Designed such disclosure controls andprocedures, or caused such disclosure controls and procedures to be designedunder its supervision, to ensure that material information relating to thesmall business issuer, including its consolidated subsidiaries, is made knownto the Company by others within those entities, particularly during the period inwhich this report is being prepared;

 

(b)           Designed such internal control overfinancial reporting, or caused such internal control over financial reportingto be designed under its supervision, to provide reasonable assurance regardingthe reliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generally acceptedaccounting principles;

 

(c)           Evaluated the effectiveness of thesmall business issuer’s disclosure controls and procedures and presented inthis report its conclusions about the effectiveness of the disclosure controlsand procedures, as of the end of the period covered by this report based onsuch evaluation; and

 

(d)           Disclosed in this report any changein the small business issuer’s internal control over financial reporting thatoccurred during the small business issuer’s most recent fiscal quarter (thesmall business issuer’s fourth fiscal quarter in the case of an annual report)that has materially affected, or is reasonably likely to materially affect, thesmall business issuer’s internal control over financial reporting; and

 

5.                                       Thesmall business issuer’s other certifying officer and I have disclosed, based onits most recent evaluation of internal control over financial reporting, to thesmall business issuer’s auditors and the audit committee of the small businessissuer’s board of directors (or persons performing the equivalent functions):

 

(a)           All significant deficiencies andmaterial weaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affect the smallbusiness issuer’s ability to record, process, summarize and report financialinformation; and

 

(b)           Any fraud, whether or not material,that involves management or other employees who have a significant role in thesmall business issuer’s internal control over financial reporting.

 

 
|   | /s/ Taffy J.  Williams                             |   |
|--------|----------------------------------------------------|--------|
|   | Taffy J.  Williams, Ph.D.  Chief Executive Officer |
|   |                                               |
|   | Date: August  20, 2004                             |

 

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