SlicerIGT extension’s Volume reconstruction module is developed for this purpose. See for example this demo:
If your ultasound image sequence does not contain position and orientation information for each frame (which is usually the case) then you can use this script to add that information and reconstruct the volume.
The script assumes that the ultrasound image sequence is loaded as a 3D volume (each time point is a frame of the volume), so you may either need to load the ultrasound image with enabling Advanced option in DICOM module and choose the Scalar Volume reader; or modify the script sothat it uses a volume sequence as input (the script will be somewhat simpler, as you don’t need to create a new sequence, just modify volumes in the sequence).