Time reversal (TR) is a powerful method for the imaging and localization of sound sources. We propose the use of TR imaging in conjunction with a field separation method (FSM) in order to study the radiating sources of a Steelpan. The TR-FSM method consists in measuring the acoustic pressure on a double-layer hemispherical time reversal mirror (TRM). Outgoing waves are separated from ingoing waves by using spherical-harmonic expansions. The outgoing contribution is then time-reversed and numerically backpropagated, allowing to achieve accurate imaging of acoustically radiating sources. This FSM also allows to separate contributions from noise source outside the region of interest, thus separating the contributions from zones on the instrument. In this study, this imaging method is used for the imaging of radiating sources on a Steelpan played by a performer. The results show that in some situations, the main contribution to the radiation comes from zones that were not mechanically excited by the steelpanist.