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DOI:10.2214/AJR.06.1524
AJR 2007; 189:219-225
© American Roentgen Ray Society

Original Research

Impact of Operator-Selected Image Noise Index and Reconstruction Slice Thickness on Patient Radiation Dose in 64-MDCT

Kalpana M. Kanal1, Brent K. Stewart1, Orpheus Kolokythas1 and William P. Shuman1

1 All authors: Department of Radiology, University of Washington Medical Center, 1959 NE Pacific St., Box 357115, Seattle, WA 98195-7115.

OBJECTIVE. Our objective was to develop a better understanding of the complex interrelationship between image noise, reconstruction slice thickness, and patient radiation dose on a 64-MDCT scanner that uses automated tube current modulation.

MATERIALS AND METHODS. We reviewed physics theory and performed phantom dose measurements on a 64-MDCT scanner while altering operator-selectable image noise and reconstruction slice thickness.

RESULTS. Using phantom dose measurements to adjust theoretic predictions, we constructed both a spreadsheet and a graph that visually display the interrelationships between operator-selected image noise and reconstruction slice thickness and the resulting patient dose.

CONCLUSION. This table and graph may help operators understand the trade-offs when prospectively trying to minimize dose and optimize image noise for selected reconstruction slice thicknesses on this type of 64-MDCT scanner.

Keywords: CT imaging • CT technique • 64-MDCT • noise index • physics • radiation dose


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