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DOI: 10.1148/radiol.2443061537
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Renal Cyst Pseudoenhancement: Influence of Multidetector CT Reconstruction Algorithm and Scanner Type in Phantom Model1

Bernard A. Birnbaum, MD, Nicole Hindman, MD, Julie Lee, MD 2, and James S. Babb, PhD

1 From the Department of Radiology, New York University Medical Center, 560 First Ave, New York, NY 10016. From the 2005 RSNA Annual Meeting. Received September 5, 2006; revision requested November 8; revision received December 7; final version accepted January 8, 2007. Address correspondence to B.A.B. (e-mail: bernard.birnbaum{at}nyumc.org).


Figure 1A
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  		Figure 1a: (a) Photograph of anthropomorphic CT phantom and interchangeable renal inserts used to study pseudoenhancement phenomenon. K = kidney. (b) Diagram of customized renal insert (side view) shows stacked 7-, 10-, and 15-mm-diameter cylindric cysts measuring 0 and 50 HU. (c) Transverse multidetector CT scan of phantom containing 140-HU left renal insert. Section obtained at mid–z-axis level of renal insert reveals 10-mm-diameter 50-HU (medial) and 0-HU (lateral) cylindric cysts.

 

Figure 1B
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  		Figure 1b: (a) Photograph of anthropomorphic CT phantom and interchangeable renal inserts used to study pseudoenhancement phenomenon. K = kidney. (b) Diagram of customized renal insert (side view) shows stacked 7-, 10-, and 15-mm-diameter cylindric cysts measuring 0 and 50 HU. (c) Transverse multidetector CT scan of phantom containing 140-HU left renal insert. Section obtained at mid–z-axis level of renal insert reveals 10-mm-diameter 50-HU (medial) and 0-HU (lateral) cylindric cysts.

 

Figure 1C
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  		Figure 1c: (a) Photograph of anthropomorphic CT phantom and interchangeable renal inserts used to study pseudoenhancement phenomenon. K = kidney. (b) Diagram of customized renal insert (side view) shows stacked 7-, 10-, and 15-mm-diameter cylindric cysts measuring 0 and 50 HU. (c) Transverse multidetector CT scan of phantom containing 140-HU left renal insert. Section obtained at mid–z-axis level of renal insert reveals 10-mm-diameter 50-HU (medial) and 0-HU (lateral) cylindric cysts.

 

Figure 2
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  		Figure 2: Graph of pseudoenhancement specificity for multidetector CT imaging regimens with standard convolution kernels. Specificity curves demonstrate variability in observed renal cyst pseudoenhancement between imaging regimens. Siemens Volume Zoom with B40 kernel regimen provided greatest specificity for a given threshold of cyst enhancement.

 




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