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Fig. 9 Without temporal calibration the video and tracking data are misaligned (top). Temporal
calibration minimizes the misalignment (bottom)
Reconstructed image volumes are often used in cross-modality image registra-
tion for fusion of ultrasound with pre-procedural CT or MRI images. These
promising applications are still in research phase, but they may have a signi
cant
role in clinical practice in the future, as they combine the excellent tissue visuali-
zation features of other modalities with the safety, portability, and accessibility of
ultrasound.
The quality of reconstructed ultrasound volumes depend on many factors,
including the quality of the input images, calibration accuracy of the transducer
tracker, the accuracy of temporal synchronization between image acquisition and
position tracking, and the algorithms applied for
filling voxels in the reconstructed
volume where a recorded image is not available. Fortunately, there are a number of
open-source implementations for ultrasound volume reconstruction algorithms.
