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CT Arthrography of the Glenohumeral Joint: CT Fluoroscopy Versus Conventional CT and Fluoroscopy—Comparison of Image-Guidance Techniques¹

¹ From the Department of Radiology, University Hospital Balgrist, Zurich, Switzerland (C.A.B., M.Z., C.W.P., J.H.); and Institute for Applied Radiophysics, Lausanne, Switzerland (F.R.V.). Received April 1, 2002; revision requested June 13; final revision received November 18; accepted February 3, 2003. Address correspondence to C.A.B., Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115 (e-mail: cbinkert@partners.org)

View larger version (85K): [in a new window]   Figure 1. Transverse images obtained with CT fluoroscopic guidance of glenohumeral injection of contrast material. (A) Needle entry site is localized with a hemostat. (B, C) Stepwise needle advancement is depicted with CT fluoroscopy. (D-F) Injection of contrast material is controlled with intermittent CT fluoroscopy.

View larger version (21K): [in a new window]   Figure 2. Graph depicts phantom measurements used for determination of effective dose associated with fluoroscopic guidance. With technical parameters set the same as in clinical fluoroscopy, dose rates were measured with 5-, 10-, and 15-cm polymethylmethacrylate (PMMA) absorbers. From these dose rates, the effective dose to the patient can be calculated when shoulder thickness, field size, and duration of fluoroscopy are known.