EXHIBIT 31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT TO RULE 13A-14(a) OR RULE 15D-14(a) OF THE SECURITIES
EXCHANGE ACT OF 1934

I, Michael A. Martino, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Sonus
Pharmaceuticals, Inc.;

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

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in
this quarterly report;

4. The registrant's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
registrant and we have:

(a) Designed such disclosure controls and procedures, or
caused such disclosure controls and procedures to be
designed under our supervision, to ensure that
material information relating to the registrant,
including its consolidated subsidiaries, is made
known to us by others within those entities,
particularly during the period in which this report
is being prepared;

(b) Evaluated the effectiveness of the registrant's
disclosure controls and procedures and presented in
this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of the
end of the period covered by this report based on
such evaluation; and

(c) Disclosed in this report any change in the
registrant's internal control over financial
reporting that occurred during the registrant's most
recent fiscal quarter that has materially affected,
or is reasonably likely to materially affect, the
registrant's internal control over financial
reporting; and

5. The registrant's other certifying officer and I have disclosed, based
on our most recent evaluation of internal control over financial
reporting, to the registrant's auditors and the audit committee of the
registrant's board of directors (or persons performing the equivalent
functions):

(a) all significant deficiencies and material weaknesses
in the design or operation of internal control over
financial reporting which are reasonably likely to
adversely affect the registrant's ability to record,
process, summarize and report financial information;
and

(b) any fraud, whether or not material, that involves
management or other employees who have a significant
role in the registrant's internal control over
financial reporting.

Date: April 21, 2004

/s/ Michael A. Martino
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Michael A. Martino
President and Chief Executive Officer