Abstract
RARE-MR-urography (RapidAcquisition withRelaxationEnhancement) is a fast MR imaging technique (6.4 s/acquisition) that selectively depicts fluid by heavy T2-weighting. From 9/1989 to 11/1990, RARE-MR urograms were prospectively evaluated in the diagnosis of upper urinary tract abnormalities in 55 children. The method is performed in several planes and combined with a coronal, T1-weighted spin-echo sequence. Forty out of 42 kidneys with dilated renal pelvis, and 21 out of 24 dilated ureters were identified, only the mildly dilated ones were missed. Even in non-functioning kidneys the urinary tract was clearly depicted by RARE-MR-urography. However, no differentiation could be made with this technique between vesicoureteral reflux and non-refluxing dilatation of ureter and/or renal pelvis. All 19 pelviureteric obstructions and all eight renal duplications with a dilated segment were identified. RARE-MR-urography is a new tool for diagnosing urinary tract abnormalities in children without having to employ ionizing radiation, contrast media, or general anesthesia. A dilated urinary tract can be shown in one image displaying the entire urinary system, similar to excretory urography. The technique is presently not able to provide the information of voiding cystourethrography or renal scintigraphy, nor is it as easy to perform as ultrasound. However, in certain cases it may replace excretory urography.
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Abbreviations
- EU:
-
excretory urography
- MR:
-
magnetic resonance
- MRI:
-
magnetic resonance imaging
- RARE:
-
RapidAcquisition withRelaxationEnhancement
- TR:
-
repetition time
- TE:
-
echo time
- US:
-
ultrasound
- VCU:
-
voiding cystourethrography
References
Hennig J, Friedburg H, Ströbel B (1986) Rapid nontomographic approach to MR-myelography without contrast agents. J Comput Assist Tomogr 10:375
Hennig J, Nauerth A, Friedburg H (1986) RARE imaging: A fast imaging method for clinical MR. Magn Res Med 3:823
Hennig J, Friedburg H (1988) Clinical applications and methodological developments of the RARE technique. Magn Res Imag 6:391
Friedburg H, Hennig J, Frankenschmidt A (1987) RARE-MR-urography: Imaging of the urinary tract with a new fast non-tomographic MR technique. Radiologe 27:45 (In German, with English summary)
Friedburg H, Westenfelder M, Roeren T, Hennig J (1987) MR of the urinary tract in pregnancy. RoeFo 147:430 (In German, with English summary)
Hennig J (1988) Multiecho imaging sequences with low refocusing flip angles. J Magn Res 78:397
Mulkern RV, Wong STS, Winalski C, Jolesz FA (1990) Contrast manipulation and artifact assessment of 2D- and 3D-RARE sequences. Magn Res Imag 8:557
Friedburg HG, Hennig J, Schumacher M (1987) Clinical application of RARE-MR-myelography as a routine MR examination: Experience with 175 cases. RoeFo 146:584 (In German, with English summary)
Dietrich RB, Kangarloo H (1986) Kidneys in infants and children: evaluation with MR. Radiology 159:215
Jequier S, Paltiel H, Lafortune M (1990) Ureterovesical jets in infants and children: Duplex and color Doppler US studies. Radiology 175:349
Marshall JL, Johnson ND, DeCampo MP (1990) Vesicoureteric reflux in children: Prediction with color Doppler imaging. Work in progress. Radiology 175:355
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Sigmund, G., Stoever, B., Zimmerhackl, L.B. et al. RARE-MR-urography in the diagnosis of upper urinary tract abnormalities in children. Pediatr Radiol 21, 416–420 (1991). https://doi.org/10.1007/BF02026676
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DOI: https://doi.org/10.1007/BF02026676