Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the annual report of Volcano Corporation (the “Company”) on Form 10-K for the period ended December 31, 2008, as filed with the Securities and Exchange Commission (the “Report”), I, John T. Dahldorf, Chief Financial Officer of the Company, certify, pursuant to Rule 13a-14(b) and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: March 9, 2009	/s/    JOHN T. DAHLDORF
	John T. Dahldorf Chief Financial Officer (principal financial officer)