High fidelity tonotopic mapping using swept source functional magnetic resonance imaging

► We developed an efficient swept source imaging (SSI) fMRI for tonotopic mapping. ► SSI integrates continuous frequency sweeping, bSSFP sequence and Fourier analysis. ► High resolution tonotopic mapping using SSI is demonstrated in inferior colliculus. ► Tonotopic injury following developmental noise exposure is studied using SSI. ► Varying sound pressure level allows SSI to probe local auditory neuronal response.