Virtual pyeloscopy using volumetric depth peeling.
OBJECTIVE
The aim of the study is to test a new volume-rendering method, volumetric depth peeling (VDP), for use in virtual pyeloscopy.


METHODS
VDP was applied to axial contrast-enhanced source computed tomographic (CT) images and coronal reformatted maximum intensity projections of three contrast-filled gloves containing objects of varying density. Similar renderings were performed on CT urograms performed to evaluate hematuria (n = 20). Renderings were assessed for anatomic appearance of ureters and specific calyces in comparison with source images.


RESULTS
Objects of soft-tissue and calcific density ranging in size from 4 to 20 mm were identified by using VDP within the glove phantoms. Normal and deformed renal calyces were well visualized by using VDP; however, two stones were not identified. The minimal ureteral width that could be visualized was 3 mm.


CONCLUSIONS
VDP may be a useful technique for virtual pyeloscopy providing that a robust and user-friendly computer interface can be developed.
Fielding
Julia R
JR
Department of Radiology, University of North Carolina at Chapel Hill, 27599, USA. julia_fielding@med.unc.edu
Borland
David
D
Lee
Kang Hoon
KH
Clarke
John P
JP
Wallen
Eric
E
Pruthi
Raj
R
Taylor
Russell M
RM