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AJR 2005; 184:491-496
© American Roentgen Ray Society

Original Report

Do Metallic Endoprostheses Increase Radiation Dose Associated with Automatic Tube-Current Modulation in Abdominal–Pelvic MDCT? A Phantom and Patient Study

Stefania M. R. Rizzo1, Mannudeep K. Kalra1, Michael M. Maher1, Michael A. Blake1, Thomas L. Toth2 and Sanjay Saini1

1 Division of Abdominal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, White 270-E, 55 Fruit St., Boston, MA 02114.
2 GE Healthcare, Waukesha, WI.

OBJECTIVE. Our objective was to assess the effect of orthopedic metallic prostheses on radiation dose associated with MDCT using z-axis automatic tube-current modulation and a fixed tube current in a phantom and patient study.

CONCLUSION. Z-modulation is associated with a 34.1% increase in the mean tube current–time product and no change in the extent of streak artifacts in patients with a metallic prosthesis, compared with patients without a prosthesis. However, compared with the fixed-tube-current technique, z-modulation is associated with a 28.9% decrease in the mean tube current–time product.


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T. Dalal, M. K. Kalra, S. M. R. Rizzo, B. Schmidt, C. Suess, T. Flohr, M. A. Blake, and S. Saini
Metallic Prosthesis: Technique to Avoid Increase in CT Radiation Dose with Automatic Tube Current Modulation in a Phantom and Patients
Radiology, August 1, 2005; 236(2): 671 - 675.
[Abstract] [Full Text] [PDF]


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