MDCT urography: experience with a bi-phasic excretory phase examination protocol

The benefit of multidetector computed tomographic urography (MDCTU) for visualising early and late excretory phase (EP) upper urinary tract (UUT) opacification has been studied. UUT opacification was retrospectively evaluated in 45 bi-phasic four-row MDCTU examinations. The UUT was divided into intr...

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Bibliographic Details
Published in:European radiology 2007-10, Vol.17 (10), p.2512-2518
Main Authors: Meindl, Thomas, Coppenrath, Eva, Degenhart, Christoph, Müller-Lisse, Ulrike L, Reiser, Maximilian F, Müller-Lisse, Ullrich G
Format: Article
Language:English
Subjects:
Abdomen
Cancer
Computed tomography
Contrast agents
Early experience
Female
Females
Humans
Kidneys
Male
Middle Aged
Patients
Radiation
Retrospective Studies
Segments
Tomography, X-Ray Computed
Ureter
Ureter - diagnostic imaging
Ureter - physiopathology
Urinary tract
Urogenital system
Urography
Urography - methods
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Summary:The benefit of multidetector computed tomographic urography (MDCTU) for visualising early and late excretory phase (EP) upper urinary tract (UUT) opacification has been studied. UUT opacification was retrospectively evaluated in 45 bi-phasic four-row MDCTU examinations. The UUT was divided into intrarenal collecting system (IRCS), proximal, middle and distal ureter. Two independent readers rated opacification: 1, none; 2, partial; 3, complete. Numbers of segments and percentages of UUTs at each score were calculated for each EP and two EPs combined. Results of a single EP and of combined EPs were compared by Wilcoxon matched-pairs signed-ranks. IRCS and proximal ureter were at least partially opacified in each EP in >95%. The middle ureter was at least partially opacified in the early and late EP in 85% and 93%, respectively. The distal ureter was opacified in 65% (49/75) in the early EP and in 78% (59/75) in the late EP. Combining two EPs, non-opacified distal segments decreased to 9% (7/75). Significant improvement between a single EP and combining two EPs were found for the middle and distal ureter (P < 0.03). Bi-phasic MDCTU substantially improved opacification of the middle and distal ureter. IRCS and proximal ureter are reliably opacified with one EP.
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-007-0600-7