[Static-dynamic MR urography. Comparison with excretory urography and scintigraphy in experimentally-induced urinary tract obstruction].
OBJECTIVE
To assess the diagnostic value of combined static-dynamic MR urography (MRU) for the functional-morphological evaluation of experimentally induced urinary tract obstruction.


METHODS
Static-dynamic MRU--combination study with a respiratory-triggered 3D-IR-TSE sequence and a dynamic 2D-FFE sequence after Gd-DTPA and furosemide--was obtained in comparison with 99mTc-MAG3 diuretic renal scintigraphy (DRS), excretory urography (EU) and ultrasound (US) in 29 healthy piglets and in 20 piglets with surgically induced ureteric stenosis (total of 50 postoperative examination blocks).


RESULTS
MRU allowed complete depiction of the urinary tract in all controls, in operated piglets the stenosis was always correctly identified. Quality of MRU was superior to EU in 36 of 43 comparative studies. Calculation of single kidney function from parenchymal renograms, and assessment of urinary excretion from whole-kidney renograms resulted in a highly significant agreement of MRU with DRS.


CONCLUSIONS
Static-dynamic MR urography allows excellent depiction of experimentally induced urinary tract obstruction, and reliable assessment of individual renal function and urinary excretion. Two advantages of the method stand out, it does not require radiation and it permits a functional-morphological correlation.
Pädiatrische Radiologie, Universität Heidelberg, Im Neuenheimer Feld 153, 69120 Heidelberg. wiltrud_rohrschneider@med.uni-heidelberg.de
W K
WK
Rohrschneider
J
J
Hoffend
K
K
Becker
K
K
Darge
R
R
Wunsch
J H
JH
Clorius
H
H
Kooijman
J
J
Tröger
D000818:Animals; D003287:Contrast Media; D006869:Hydronephrosis / Q000175:diagnosis; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D011866:Radioisotope Renography; D012680:Sensitivity and Specificity; D013552:Swine; D014517:Ureteral Obstruction / Q000175:diagnosis* / Q000503:physiopathology; D014563:Urodynamics / Q000502:physiology*; D014567:Urography / Q000379:methods*
D003287:Contrast Media