Radiation Exposure With Use Of the Inverted-C-Arm Technique in Upper-Extremity Surgery
Michael R. Tremains, MD; Gregory M. Georgiadis, MD; Michael J. Dennis, PhD

Abstract

Background: Intraoperative fluoroscopy is commonly used in surgical procedures on upper extremities. We compared radiation exposure from two possible positions of the mobile digital fluoroscopy unit (c-arm): (1) the standard technique, with the x-ray tube down (near the floor) and the image intensifier at the top of the c-arm, and (2) the inverted position, in which the image intensifier is used as a table and the x-ray tube is up.

Methods: A commercially available c-arm was used to irradiate a phantom hand in one of three configurations. In the first, the phantom hand was placed on an armboard equidistant from the x-ray tube and the image intensifier with the beam directed upward. In the second, the c-arm was inverted with the beam directed downward and the image intensifier used as a table. The third configuration was identical to the second except that a magnified image was used. Radiation exposure was measured at four locations corresponding to the approximate position of the surgeon’s head, chest, and groin and the patient’s hand.

Results: The amount of radiation exposure to both the surgeon and the patient was significantly less when the c-arm was used in the inverted position (p < 0.0001). The dose rate to the patient’s hand was reduced by 59%. The radiation exposure to the surgeon’s head, body, and groin with the inverted-c-arm technique was 67%, 45%, and 15% of the measured doses with the x-ray-tube-down configuration. When we used the magnification mode of the image intensifier, with its correspondingly smaller field size, the doses were further reduced to 46%, 32%, and 11% of the standard-configuration values.

Conclusions: Use of the inverted-c-arm technique with the image intensifier as an operating table can significantly reduce radiation exposure to the surgeon and the patient during surgical procedures on upper extremities.

Footnotes

  • Investigation performed at the Departments of Orthopaedic Surgery and Radiology, Medical College of Ohio, Toledo, Ohio

  • No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.

  • A commentary is available with the electronic versions of this article, on our web site (www.jbjs.org) and on our CD-ROM (call 781-449-9780, ext. 140, to order).


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