Standard EUS is performed with radial ultrasound imaging perpendicular to the endoscope shaft. Radial ultrasound imaging is preferred for some diagnostic and staging purposes because of ease of use as well as the production of a full 360° field of view like a CT scan. The convex array echoendoscope incorporates a transducer placed at the tip of an oblique viewing endoscope and provides ultrasound images in a plane parallel to the direction of the insertion of the echoendoscope [1]. Use of the convex device offers the significant advantage of facilitating intervention. The curved linear array design also makes it possible to direct needle aspiration for biopsy and/or fine needle injection, a useful feature in the diagnosis and treatment of a variety of clinical conditions [1, 2].


Sigmoid Colon Retrograde Fashion Staging Purpose Standard Endoscope Catheter Probe 
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    Akahoshi K, Harada N, Nawata H (2003) The current state of endoscopic ultrasonography. In: Pandalai SG (ed) Recent research developments in radiology. Transworld Research Network, Trivandrum, pp 1–37Google Scholar
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    Akahoshi K, Tanaka T, Matsui N et al (2007) Newly developed all in one EUS system: one cart system, forward-viewing optics type 360° electronic radial array echoendoscope and oblique-viewing type convex array echoendoscope. Fukuoka Acta Med 98:82–89PubMedGoogle Scholar
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    Matsui N, Akahoshi K, Motomura Y et al (2010) Successful EUS-FNA of the pelvic lymph node through the sigmoid colon: report of acase. Dig Endosc 22:337–340PubMedCrossRefGoogle Scholar
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    Akahoshi K, Chijiiwa Y, Hamada S et al (1998) Pretreatment staging of endoscopically early gastric cancer with a 15 MHz ultrasound catheter probe. Gastrointest Endosc 48:470–476Google Scholar
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    Akahoshi K, Kondoh A, Nagaie T et al (2000) Preoperative staging of rectal cancer using a 7.5 MHz front-loading US probe. Gastrointest Endosc 50:95–98CrossRefGoogle Scholar

Copyright information

© Springer 2012

Authors and Affiliations

  • Kazuya Akahoshi
    • 1
  1. 1.Department of GastroenterologyAso Iizuka HospitalIizuka city, FukuokaJapan

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