Background : Major obstacle to the use of IVUS include equipment complexity, difficulties in integrating IVUS into a busy catheterization laboratory, and requirement of additional procedure time. The new Galaxy^TM IVUS imaging system is an easy-to-use operation, delivering accurate and quality diagnostic information with longitudinal reconstruction, image bookmarking and digital image storage. We report the feasibility of new IVUS system guided percutaneous coronary intervention(PCI). Medhods : Ninety two patients with 94 coronary lesions underwent PCI. IVUS images using Atlantis^TM SR plus catheter, high definition 40Mhz,were obtained before and after PCI. IVUS procedure with automatic pull back device was performed in all patients. Stent lenth and size was determined by use of longitudinal reconstruction image. Results : An optimal stent deployment was achieved in 92% of the 94 lesions. The average procedure time was 45 minute(+/- 18 minutes). Time related with IVUS system was 13 minute(+/- 4 minutes). Comparing with other conventional IVUS systems which are not capable of making longitudinal image, determination of stent lenth and target site for stent coverage was very simple and accurate with use of longitudinal reconstruction image by the new system. There were no IVUS associated complications during all procedures. Conclusion : Longitudinal intravascular ultrasound system with digital image storage guided PCI was a simple, convenient and a short time-requiring method.