A variety of imaging modalities are available for the preoperative evaluation of potential implant sites. The pantomograph provides initial screening information. Cephalometric films are most useful in analyzing the incisor regions. Tomography can provide cross-sectional views of segments at a relatively low patient radiation dose. Computed tomography is a superior method when the analysis of complete arches is required. Experimental designs of postoperative radiologic evaluation of small changes in bone height require reproducible image geometry and the evaluation of intraobserver error.