1. A method of performing ultrasound imaging of a medium, the method comprising: exciting a first transducer element in an array of transducer elements to direct an ultrasound signal into a target region of the medium; receiving a backscatter signal from the target region within the medium from the array of transducer elements; generating an inter-element transfer matrix of the received backscatter signal; said inter-element transfer matrix comprising density contrast data relating to one or more scatterers within said medium; generating a generalized time-reversal (TR) matrix from the inter-element transfer matrix; and generating a pseudo-spectrum for generalized TR-Music imaging of the target region, said pseudo-spectrum comprising density contrast data relating to one or more scatterers within said medium, wherein generating the inter-element transfer matrix comprises calculating the inter-element transfer matrix as a function of an electro-mechanical response of each transducer element in the array, a diffraction response of each transducer element in the array, and attenuation in the target region.