Contrast-enhanced dynamic MR nephrography using the TurboFLASH navigator-gating technique in children

Magnetic resonance nephrography for planning of laparoscopic partial nephrectomy in a pediatric case of ureteral triplication

“…This technique permits the quantitative recording of the course of contrast-medium concentration within the collecting systems. Moreover, the time-dependent change of contrast-medium concentration in the collecting system can accurately be assessed without signal contamination from the renal parenchyma [2,4,5]. Because costs for MR nephrography are comparable with those of renal scintigraphy, the possibly required sedation for small children and the administration of contrast material might be the only disadvantage.…”

“…Functional evaluation by dynamic MR nephrography lead to the requested information. It allowed an exact region-of-interest evaluation within the renal parenchyma and the urinary passage [5,6]. The exact correlation between the preoperative imaging and the intraoperative situs underlined the superiority of the MR nephrography in this regard.…”

“…This method combines functional and morphologic analyses of the urinary tract in one single investigation. Magnetic resonance nephrography provides a higher spatial resolution compared with sonography, allows a more precise definition of regions-of-interest than does MAG3 renal scan, and does not use ionizing radiation [2,[4][5][6]. Renal scarring could be ruled out, and the split function could be assessed sufficiently through MR urography.…”

Fusion and subtraction post-processing in body MRI

“…A subtraction algorithm performs this task to create images that can be manually adjusted in all the standard ways to suit the user [9]. Dynamic subtraction imaging has been thoroughly described in the literature [10][11][12] and is a well-established technique, particularly in MR angiography [13] and MR urography [14]. The use of subtraction as a postprocessing tool for quantitative analysis is beyond the scope of this article.…”

Dynamische Magnetresonanz-Nephrografie und -Urografie bei Kindern mit Harnwegserkrankungen

“…Die extrem kurze Akquisitionsdauer der TurboFLASH-Sequenz von ca. 0,5s erlaubt hierbei die Kombination mit einer Navigator-Technik zur Aufnahme-Triggerung bei identischer Zwerchfellposition [16]. Mit diesem Manuskript berichten wir über unsere Erfahrungen bei 20 Kindern mit Harnwegsanomalien unter Verwendung dieser Sequenz im Rahmen der MR-Nephrografie im Vergleich zur MAG3-Szintigrafie als Referenz.…”