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DOI: 10.1055/s-0038-1629473
Parametrische Darstellung der Nierenfunktion mit 99mTC-Merkaptoazetyltriglyzin (MAG3)
Parametric Imaging of the Kidneys Using 99mTc-Mercaptoacetyltriglycine (MAG3)Publication History
Eingegangen:
28 October 1988
in revidierter Form:
16 February 1989
Publication Date:
04 February 2018 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00034924/198903/lookinside/thumbnails/10-1055-s-0038-1629473_de-1.jpg)
99mTc-mercaptoacetyltriglycine (MAG3) has recently been introduced for imaging kidney function. Due to the much lower radiation dose per MBq, the total administered activity can be much higher than in the case of 131l-ortho-iodo-hippurate (OIH). The improved counting statistics make this tracer useful for parametric imaging of the kidneys. To investigate this potential of MAG3, its kinetics was compared with that of the reference tracer OIH in 38 patients. Parameters of extrarenal tracer kinetics such as the distribution volumes, the whole-body elimination times and the clearance rates showed a good correlation; however, the clearance rate of MAG3 was always lower than that of OIH. The intrarenal kinetics was investigated using the transfer function which was calculated by deconvolution analysis of the renographic curves. Parameters of the transfer function such as the amplitude, extraction fraction and mean transport time demonstrated a high correlation between the two tracers. Since MAG3 seems to be suitable for parametric imaging of kidney function, parametric images of perfusion, uptake, extraction and transport times were calculated by deconvolution analysis of the MAG3 pixel-renograms in various renal disorders. The parameters were distributed homogenously throughout the parenchyma of normal kidneys. In a kidney with a hemodynamically significant renal artery stenosis the perfusion parameter was decreased and the time parameter was prolonged. Further examples of a renal graft acute tubular necrosis, an obstructive uropathy, an obstructive nephropathy and of a horse-shoe kidney demonstrate that the parametric images are useful for quantitative investigation of regional renal function.
Zusammenfassung
Das vor kurzem eingeführte nierengängige Radiopharmakon 99mTc-Merkaptoazetyltriglyzin (MAG3) kann bei geringerer Strahlenexposition in höherer Dosierung als 131J-ortho-Jod-Hippursäure (OJH) appliziert werden. Die Substanz bietet sich zur paramemit 99mTc die Voraussetzung einer guten Meßstatistik erreicht wird. Um diese Einsatzmöglichkeit der Substanz zu prüfen, wurde bei 38 Patienten die Kinetik von MAG3 mit der Kinetik der Referenzsubstanz OJH durch Doppeltraceruntersuchungen verglichen. Die Parameter der intrarenalen Kinetik wie z. B. die Extraktionsfraktion und die mittlere Transportzeit wurden aus der durch Dekonvolutionsanalyse gewonnenen Transferfunktion abgeleitet. Es zeigte sich eine hohe Korrelation zwischen beiden Tracern. Die durch Dekonvolutionsanalyse der Pixel-Aktivitätskurven berechneten Parameterbilder ergaben im Parenchym gesunder Nieren eine gleichmäßige Verteilung. Bei einer hämodynamisch wirksamen Nierenarterienstenose fanden wir reduzierte Perfusions- und prolongierte Zeitparameter. Andere Untersuchungen bei Transplantatischämie, obstruktiver Uropathie ohne und mit Parenchymschaden sowie bei einer Hufeisenniere beweisen, daß die mit Hilfe von MAG3 berechneten Parameterbildungen eine klinisch relevante Aussage über die regionale Nierenfunktion ermöglichen.
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