A rapid T1 mapping method for assessment of murine kidney viability using dynamic manganese-enhanced magnetic resonance imaging

Kai Jiang, Hui Tang, Prasanna K. Mishra, Slobodan I Macura, Lilach O Lerman

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3 Scopus citations

Abstract

Purpose: Dynamic manganese-enhanced MRI (MEMRI) allows assessment of tissue viability by tracing manganese uptake. We aimed to develop a rapid T1 mapping method for dynamic MEMRI to facilitate assessments of murine kidney viability. Methods: A multi-slice saturation recovery fast spin echo (MSRFSE) was developed, validated, and subsequently applied in dynamic MEMRI at 16.4T on ischemic mouse kidneys after 4 weeks of unilateral renal artery stenosis (RAS). Baseline T1 values and post-contrast R1 (1/T1) changes were measured in cortex (CO), outer (OSOM), inner (ISOM) strips of outer medulla, and inner medulla (IM). Results: Validation studies showed strong agreement between MSRFSE and an established saturation recovery Look-Locker method. Baseline T1 (s) increased in the stenotic kidney CO (2.10 [1.95-2.56] vs. 1.88 [1.81-2.00], P=0.0317) and OSOM (2.17 [2.05-2.33] vs. 1.96 [1.87-2.00], P=0.0075) but remained unchanged in ISOM and IM. This method allowed a temporal resolution of 1.43min in dynamic MEMRI. Mn2+ uptake and retention decreased in stenotic kidneys, particularly in the OSOM (ΔR1: 0.48 [0.38-0.56] vs. 0.64 [0.61-0.69] s-1, P<0.0001). Conclusion: Dynamic MEMRI by MSRFSE detected decreased cellular viability and discerned the regional responses to RAS. This technique may provide a valuable tool for noninvasive evaluation of renal viability.

Original languageEnglish (US)
JournalMagnetic Resonance in Medicine
DOIs
StateAccepted/In press - Jan 1 2017

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Keywords

  • Kidney viability
  • Manganese-enhanced MRI
  • Renal artery stenosis
  • T mapping

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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