The whole procedure is performed under fluoroscopic imaging guidance. Once in the hospital the intubation continued under fluoroscopic guidance. Barium fluoroscopic examinations and CT are commonly used to evaluate the patient with abdominal complaints. Thus, over time the cameras and recording media for fluoroscopic imaging have progressed as follows. The lead is fed through carefully with fluoroscopic guidance to the appropriate spinal level. Temporal blurring also complicates measurements of system performance for fluoroscopic systems. The pacing electrode is advanced through the vein under fluoroscopic and electrocardiographic guidance. Upper gastrointestinal series and their fluoroscopic counterparts use x-rays to image the swallowing motions. After the procedure, fluoroscopic images are made to show placement. Fluoroscopic guidance decreases the risk for complications. The 3D image itself can be overlaid colour-coded on top of the fluoroscopic image. The needle is placed with fluoroscopic x-ray guidance. The procedure is carried out in a sterile environment under fluoroscopic guidance. Kassabian's clinical work included the acquisition of fluoroscopic images. Fluoroscopic guidance is the most frequent, giving better real-time monitoring of the needle.