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Functional, dynamic, and anatomic MR urography: feasibility and preliminary findings
R W Katzberg1, M H Buonocore, M Ivanovic
1Department of Radiology, University of California-Davis, Medical Center, Research Imaging Center, Sacramento 95817, USA.
Academic Radiology
|November 28, 2001
Summary
Magnetic resonance (MR) urography effectively assesses kidney function and anatomy. This study shows MR urography can differentiate normal from hydronephrotic kidneys using split filtration fraction and MR renograms.
Area of Science:
- Radiology
- Nephrology
- Medical Imaging
Background:
- Hydronephrosis diagnosis often requires multiple imaging modalities.
- Assessing renal function, dynamics, and anatomy comprehensively can be challenging.
Purpose of the Study:
- To evaluate the feasibility of magnetic resonance (MR) urography for comprehensive assessment of renal function, dynamics, and anatomy.
- To determine if MR urography can differentiate between normal and hydronephrotic kidneys.
Main Methods:
- MR urography techniques including split renal filtration fraction measurement and MR renography were employed.
- T1 mapping of blood and renal tissues, along with T2-weighted and T1-weighted imaging, were utilized.
- Image analysis focused on signal intensity changes in renal cortex and medulla to derive renograms.
Main Results:
- Split filtration fraction successfully differentiated normal from hydronephrotic kidneys.
- MR renograms depicted distinct vascular, tubular, and ductal phases, distinguishing between normal and hydronephrotic kidneys (P < .05).
- MR urography demonstrated high sensitivity (100%) for detecting hydronephrosis and delayed excretion, with specificities of 64% and 85%, respectively.
Conclusions:
- MR urography is a promising non-invasive tool for comprehensive renal assessment.
- The technique allows for simultaneous evaluation of renal function, dynamics, and anatomy.
- Preliminary findings support the utility of MR urography in managing patients with hydronephrosis.