1. A method for estimating receiver coil sensitivity in a magnetic resonance (MR) system, the method comprising: estimating a transmit field of a transceiver coil from signal intensity images acquired by the MR system; determining a transverse electromagnetic field B_xy of the transceiver coil using at least one phase image; determining a receiver sensitivity of the transceiver coil using the transmit field and transverse electromagnetic field; using the transceiver coil as a reference coil for estimating a coil sensitivity of a second receiver coil; and estimating a receiver coil sensitivity using a reference method with the estimated receive sensitivity of the transceiver coil.