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[Utilization of ultrasonography in the fields of critical care medicine and anesthesiology: preface and comments ].

Recently, with the development of technology, opportunities for the clinical use of ultrasonography are increasing. Regarding this circumstance, the current issue highlights the use of ultrasonography in critical care and anesthesia Chapters include cardiac, lung and abdominal echography, and various perioperative use of ultrasonography including ultrasound-guided procedures. Every author emphasizes that "Seeing the image of ultrasonography is believing". Finally, I hope the current issue help the readers get cutting edge knowledge of the utilization of ultrasonography in the clinical practice.