Delineation of upper urinary tract segments at MDCT urography in patients with extra-urinary mass lesions: retrospective comparison of standard and low-dose protocols for the excretory phase of imaging.
In: European Radiology, Jg. 21 (2011-02-01), Heft 2, S. 378-384
Online
academicJournal
Zugriff:
Purpose: Excretory-phase CT urography (CTU) may replace excretory urography in patients without urinary tumors. However, radiation exposure is a concern. We retrospectively compared upper urinary tract (UUT) delineation in low-dose and standard CTU. Material and Methods: CTU (1-2 phases, 120 KV, 4 × 2.5 mm, pitch 0.875, i.v. non-ionic contrast media, iodine 36 g) was obtained with standard (14 patients, n = 27 UUTs, average 175.6 mAs/slice, average delay 16.8 min) or low-dose (26 patients, n = 86 UUTs, 29 mAs/slice, average delay 19.6 min) protocols. UUT was segmented into intrarenal collecting system (IRCS), upper, middle, and lower ureter (UU,MU,LU). Two independent readers (R1,R2) graded UUT segments as 1-not delineated, 2-partially delineated, 3-completely delineated (noisy margins), 4-completely delineated (clear margins). Chi-square statistics were calculated for partial versus complete delineation and complete delineation (clear margins), respectively. Results: Complete delineation of UUT was similar in standard and low-dose CTU (R1, p > 0.15; R2, p > 0.2). IRCS, UU, and MU clearly delineated similarly often in standard and low-dose CTU (R1, p > 0.25; R2, p > 0.1). LU clearly delineated more often in standard protocols (R1, 18/6 standard, 38/31 low-dose, p > 0.1; R2 18/6 standard, 21/48 low-dose, p < 0.05). Conclusions: Low-dose CTU sufficiently delineated course of UUT and may locate obstruction/dilation, but appears unlikely to find intraluminal LU lesions. [ABSTRACT FROM AUTHOR]
Titel: |
Delineation of upper urinary tract segments at MDCT urography in patients with extra-urinary mass lesions: retrospective comparison of standard and low-dose protocols for the excretory phase of imaging.
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Autor/in / Beteiligte Person: | Mueller-Lisse, UL ; Coppenrath, EM ; Meindl, T ; Degenhart, C ; Scherr, MK ; Stief, CG ; Reiser, MF ; Mueller-Lisse, UG ; Mueller-Lisse, Ulrike L ; Coppenrath, Eva M ; Meindl, Thomas ; Degenhart, Christoph ; Scherr, Michael K ; Stief, Christian G ; Reiser, Maximilian F ; Mueller-Lisse, Ullrich G |
Link: | |
Zeitschrift: | European Radiology, Jg. 21 (2011-02-01), Heft 2, S. 378-384 |
Veröffentlichung: | 2011 |
Medientyp: | academicJournal |
ISSN: | 0938-7994 (print) |
DOI: | 10.1007/s00330-010-1935-z |
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