You got a 32 bit image and you want to deploy image in the 64bit system, am I right? If I understand the question, I think you may take a look at this post.
I want to summerize the information, but you know it is too long. So I just copy the shortest one, and you can view more by visiting the original post.
"Ran this and added the 32bit image to SCCM"
Trying to create x86 MDT Boot image for Windows 7 32bit deployment - error