1. A method of generating a 3-D image of at least one cement bolus in relation to a bone comprising: a) acquiring a plurality of fluoroscopic images of the cement bolus during or after a cement injection procedure; b) registering each fluoroscopic image with a CT scan image of the bone; c) outlining the bolus in each fluoroscopic image to generate a plurality of silhouettes of the bolus; d) projecting the silhouettes on to the CT scan image to generate a plurality of back-projections; e) identifying a plurality of bolus voxels to generate the 3-D image of the bolus, wherein each bolus voxel comprises an intersection of at least two back-projections.