Combining phase data from multi-channel coils at high field is challenging. Many approaches involve optimization or iterative steps which require offline reconstruction. We present a simple method that avoids the need for unwrapping or other fragile or time consuming steps by using echo times that satisfy $$$T_{E,2}=2\,\cdot\,T_{E,1}$$$. ASPIRE is compared with the Roemer method, MCPC-3D-I and the Hermitian inner product. ASPIRE achieves similar phase matching quality to Roemer but has the advantage that the combined phase values correspond to the B0 field. It is less computationally demanding than MCPC-3D-I and has higher CNR than the Hermitian inner product.
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