POWER OF ATTORNEY

Know all by these presents that the undersigned hereby constitutes
and appoints each of William J. O'Shaughnessy, Jr. and Elena H. Radine,
signing singly, his true and lawful attorney-in-fact to:

(1)    execute for and on behalf of the undersigned Forms 3, 4 and 5
in accordance with Section 16(a) of the Securities Exchange Act of 1934
and the rules thereunder;

(2)    do and perform any and all acts for and on behalf of the
undersigned which may be necessary or desirable to complete the execution
of any such Form 3, 4 or 5 and the timely filing of such form with the
United States Securities and Exchange Commission and any other authority;
and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit
to, in the best interest of, or legally required by, the undersigned, it
being understood that the document executed to this Power of Attorney shall
be in such form and shall contain such terms and conditions as such
attorney-in-fact may approve in his/her discretion.

The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform all and every act and thing whatsoever
requisite, necessary and 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 such
attorney-in-fact, or 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 any of the undersigned's responsibilities
to comply with Section 16 of the Securities Exchange Act of 1934.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 17th day of January, 2017


/s/ Michael E. Prevoznik
MICHAEL E. PREVOZNIK

STATE OF New Jersey    )
            ) ss.
COUNTY OF Morris    )

On this 17th day of January, 2017, before me, DAWN M. LEAHY, the undersigned
notary public, personally appeared MICHAEL E. PREVOZNIK, proved to me on the
basis of satisfactory evidence to be the person whose name is subscribed to the
within instrument, and acknowledged to me that he executed the same for the
purposes therein stated.



/s/ Dawn M. Leahy
Notary Public
My Commission Expires: September 12, 2018