An apparatus for positioning calibration markers may include an extension arm connected to one or more radio-dense calibration markers. The apparatus may also include a mounting device removably attachable to a radiographic imaging device and coupled to the extension arm. The mounting device may provide for translation of the extension arm with respect to the radiographic imaging device in at least a first dimension. The apparatus may additionally include one or more visual alignment features on the mounting device. The one or more visual alignment features may be configured to align the one or more radio-dense calibration markers relative to the radiographic imaging device. The translation of the extension arm may repositions the one or more radio-dense calibration markers with respect to the radiographic imaging device.
