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Scientific article
English

Parametric and quantitative analysis of MR renographic curves for assessing the functional behaviour of the kidney

Contributors

Michoux, N; Montet, Xavier Cédric Rodolphe; Pechere, Antoinette; Ivancevic, Marko Kresimir; Martin, Pierre-Yves; Keller, A.; Didier, D.; Terrier, François; Vallée, Jean-Paul

Published in

European journal of radiology, vol. 54, no. 1, p. 124-135

Publication date

2004-04

Abstract

The aim of this study was to refine the description of the renal function based on MR images and through transit-time curve analysis on a normal population and on a population with renal failure, using the quantitative model of the up-slope. Thirty patients referred for a kidney MR exam were divided in a first population with well-functioning kidneys and in a second population with renal failure from ischaemic kidney disease. The perfusion sequence consisted of an intravenous injection of Gd-DTPA and of a fast GRE sequence T1-TFE with 90° magnetisation preparation (Intera 1.5 T MR System, Philips Medical System). To convert the signal intensity into 1/T1, which is proportional to the contrast media concentration, a flow-corrected calibration procedure was used. Following segmentation of regions of interest in the cortex and medulla of the kidney and in the abdominal aorta, outflow curves were obtained and filtered to remove the high frequency fluctuations. The model of the up-slope method was then applied. Significant reduction of the cortical perfusion (Qc=0.057±0.030 ml/(s 100 g) to Qc=0.030±0.017 ml/(s 100 g), P<0.013), of the medullary perfusion (Qm=0.023±0.018 ml/(s 100 g) to Qm=0.011±0.006 ml/(s 100 g), P<0.046) and of the accumulation of contrast media in the medulla (Qa=0.005±0.003 ml/(s 100 g) to Qa=0.0009±0.0008 ml/(s 100 g), P<0.001) were found in presence of renal failure. High correlations were found between the creatinine level and the accumulation Qa in the medulla (r2=0.72, P<0.05), and between the perfusion ratio Qc/Qm and the accumulation Qa in the medulla (r2=0.81, P<0.05). No significant difference was found in times to peak between both populations despite a trend showing Ta the time to the end of the increasing contrast accumulation period in the medulla, arriving later for renal failure. Advances in MR signal calibration with the building of quantitative model such as the up-slope allow to assess kinetic and haemodynamic and functional parameters of the diseased kidney.

Keywords

  • Contrast Media/pharmacokinetics
  • Female
  • Gadolinium DTPA/pharmacokinetics
  • Humans Kidney Function Tests
  • Magnetic Resonance Imaging/methods
  • Male
  • Middle Aged
  • Renal Circulation
  • Renal Insufficiency/physiopathology
  • Statistics, Nonparametric

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

MICHOUX, N et al. Parametric and quantitative analysis of MR renographic curves for assessing the functional behaviour of the kidney. In: European journal of radiology, 2004, vol. 54, n° 1, p. 124–135. doi: 10.1016/j.ejrad.2004.04.010

Main files (1)

Article (Published version)

Identifiers

Additional URL for this publication

https://linkinghub.elsevier.com/retrieve/pii/S0720048X0400138X

Journal ISSN

0720-048X
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Technical informations

Creation

30/11/2022 09:27:52

First validation

16/05/2023 06:20:41

Update

16/05/2023 06:20:41

Status update

16/05/2023 06:20:41

Last indexation

01/11/2024 05:01:35
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