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Fig. 7 | SpringerPlus

Fig. 7

From: Fully automated tracking of cardiac structures using radiopaque markers and high-frequency videofluoroscopy in an in vivo ovine model: from three-dimensional marker coordinates to quantitative analyses

Fig. 7

To obtain 3D reconstructions of the markers, the two cameras were calibrated using a custom-build radiopaque steel plate (a). This calibration pattern consists of three rows of 5 mm holes. This hole arrangement allows the identification of each hole in the calibration pattern during the calibration step. b Shows the identification of the holes

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