Estimation of single‐kidney glomerular filtration rate without exogenous contrast agent. Issue 1 (6th March 2013)

• Record Type: Journal Article
• Authors: He, Xiang; Aghayev, Ayaz; Gumus, Serter; Ty Bae, K.
• Is Part Of: Magnetic resonance in medicine. Volume 71:Issue 1(2014:Jan.)
• Page Start: 257
• Page End: 266
• Publication Date: 2013-03-06
• Subjects: Nuclear magnetic resonance -- Periodicals; Electron paramagnetic resonance -- Periodicals; 616.07548
• DOI: 10.1002/mrm.24668
• Languages: English
• ISSNs: 0740-3194

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="mrm24668-sec-0001" sec-type="section"> <title>Purpose</title> <p>Measurement of single‐kidney filtration fraction and glomerular filtration rate (GFR) without exogenous contrast is clinically important to assess renal function and pathophysiology, especially for patients with comprised renal function. The objective of this study is to develop a novel MR‐based tool for noninvasive quantification of renal function using conventional MR arterial spin labeling water as endogenous tracer.</p> </sec> <sec id="mrm24668-sec-0102" sec-type="section"> <title>Theory and Methods</title> <p>The regional differentiation of the arterial spin labeling water between the glomerular capsular space and the renal parenchyma was characterized and measured according to their MR relaxation properties (<italic>T</italic><sub>1ρ</sub> or <italic>T</italic><sub>2</sub>), and applied to the estimation of filtration fraction and single‐kidney GFR. The proposed approach was tested to quantify GFR in healthy volunteers at baseline and after a protein‐loading challenge.</p> </sec> <sec id="mrm24668-sec-0103" sec-type="section"> <title>Results</title> <p>Biexponential decay of the cortical arterial spin labeling water MR signal was observed. The major component decays the same as parenchyma water; the minor component decays much slower as expected from glomerular ultra‐filtrates. The mean single‐kidney GFR was estimated to be 49 ± 9 mL/min at baseline and increased by 28% after a protein‐loading challenge.</p> </sec> <sec id="mrm24668-sec-0104" sec-type="section"> <title>Conclusion</title> <p>We developed an arterial spin labeling‐based MR imaging method that allows us to estimate renal filtration fraction and singe‐kidney GFR without use of exogenous contrast. Magn Reson Med 71:257–266, 2014. © 2013 Wiley Periodicals, Inc.</p> </sec> </abstract>