Multidetector row CT urography: does supine or prone positioning produce better pelvecalyceal and ureteral opacification?

Zhen J. Wang, Fergus V. Coakley, Bonnie N. Joe, Aliya Qayyum, Maxwell V. Meng, Benjamin M. Yeh

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Purpose: To evaluate whether supine or prone positioning improves pelvicalyceal and ureteral opacification at multi-detector row computed tomographic (CT) urography. Methods: We retrospectively reviewed the CT urograms of 114 consecutive patients performed for hematuria. Using a "split-bolus" technique, all patients were imaged 340 s after the injection of intravenous contrast, 63 in the supine and 51 in the prone position. The right and left pelvicalyceal systems and ureters were divided into six segments: anterior calyces, posterior calyces, renal pelvis, proximal ureter, mid ureter, and distal ureter. Two readers rated the opacification of each segment in consensus on a four-point scale from 0 (no opacification) to 3 (excellent opacification). Opacification scores were compared between supine and prone CT urograms using generalized estimating equation models. Results: Supine positioning resulted in higher opacification scores of the renal pelvis and the posterior calyces than prone positioning (P<.01). Prone positioning resulted in higher opacification scores of the anterior calyces only (P<.01). No significant differences were seen between the supine and prone opacification scores for the proximal, mid, or distal ureters (P values all >.5). Conclusion: Supine positioning results in overall greater opacification of the pelvicalyceal system compared to prone positioning at CT urography.

Original languageEnglish (US)
Pages (from-to)369-373
Number of pages5
JournalClinical Imaging
Volume33
Issue number5
DOIs
StatePublished - Sep 1 2009

Keywords

  • CT
  • Kidney
  • Ureter
  • Urography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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