After consulting my colleagues on this topic, I would like to correct the previous message which stated that Pix4Dmapper is able to process push broom images:
In general, the software is designed for use with digital images captured by unmanned and manned aerial vechicles. Currently, Pix4Dmapper does not support images originating from push broom scanners. These sensors use a line of detectors perpendicular to the flight direction which collect one line of pixels at a time, so in the end you get multiple images containing one line of pixels. For processing in Pix4Dmapper, this would imply finding keypoints in each line of pixels (i.e. image) and matching them with the keypoints from the other lines of pixels. Moreover, it should compute the position and orientation of each line of pixels (i.e. image) based on these keypoints.
Therefore, these sensors have a completely different technique of capturing images than the cameras handled by Pix4Dmapper.