1) 4DCT exams using the VisionRT system and Toshiba scanner provide 10 respiratory phase datasets but require long reconstruction times of over 5 hours. 2) There are issues with mismatches between the breathing signal and images due to factors like couch acceleration and different velocities reported by VisionRT and Toshiba. 3) Proper definition of monitoring points, respiratory thresholds, and image reconstruction parameters like slice thickness are important to reduce artifacts but more investigation is needed on their effects.