POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby authorizes Nicholas A. 
Poan, Kristin Osborn, Kirk Hoffman and Leigh Ann Clifford of Alliance HealthCare 
Services, Inc. (the "Company"), and each of them individually to execute for and 
on behalf of the undersigned, in the undersigned's capacity as an officer of the 
Company, Forms 3, 4 and 5, and any amendments thereto, and cause such form(s) to 
be filed with the U.S. Securities and Exchange Commission (the "SEC") pursuant 
to Section 16(a) of the Securities Act of 1934, as amended (the "1934 Act") 
relating to the undersigned's beneficial ownership of securities in the Company. 
The undersigned hereby grants to each such attorney-in-fact full power and 
authority to do and perform any and every act and thing whatsoever requisite, 
necessary, or proper to be done in the exercise of any of the rights and powers 
herein granted, as fully to all intents and purposes as the undersigned might or 
could do if personally present, with full power of substitution or revocation, 
hereby ratifying and confirming all that each such attorney-in-fact, or each 
such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to 
be done by virtue of this power of attorney and the rights and powers herein 
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in 
serving in such capacity at the request of the undersigned, are not assuming, 
nor is the Company assuming, any of the undersigned's responsibilities to comply 
with Section 16 of the 1934 Act.
This Power of Attorney shall remain in full force and effect until the 
undersigned is no longer required to file Forms 3, 4 and 5 with respect to the 
undersigned's holdings of, and transactions in, securities issued by the 
Company, unless earlier revoked by the undersigned in a signed writing delivered 
to the foregoing attorneys-in-fact.
In Witness Whereof, the undersigned has caused this Power of Attorney to be 
executed as of this 4th day of June 2013. 
 
/s/
_____________________
Howard Aihara
Alliance HealthCare Services, Inc 4
