Figure 12d. Potential pitfall of the paintbrush technique. (a, b) Posteroanterior epicardial VR image (b) shows a truncated ssRLL pulmonary vein because the vein was incompletely included in the "painting" of the axial multi-detector row CT source image (a). Arrow indicates vein. (c, d) Lateral reformatted image (c) with the ssRLL vein correctly "painted" (arrowheads) results in the posteroanterior epicardial VR image seen in d, which shows the vein draining into the top of the left atrium. These four images illustrate the need for careful review of the source images prior to VR.