Related Experiment Video
Updated: May 31, 2026
Non-invasive Imaging of Acute Allograft Rejection after Rat Renal Transplantation Using 18F-FDG PET
Published on: April 28, 2013
Diffusion tensor imaging and tractography for assessment of renal allograft dysfunction-initial results
Katja Hueper1, M Gutberlet, T Rodt
1Hannover Medical School-Germany, Institute for Diagnostic and Interventional Radiology, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. hueper.katja@mh-hannover.de
Objectives:
To evaluate MR diffusion tensor imaging (DTI) as non-invasive diagnostic tool for detection of acute and chronic allograft dysfunction and changes of organ microstructure.
Methods:
15 kidney transplanted patients with allograft dysfunction and 14 healthy volunteers were examined using a fat-saturated echo-planar DTI-sequence at 1.5 T (6 diffusion directions, b = 0, 600 s/mm²). Mean apparent diffusion coefficient (ADC) and mean fractional anisotropy (FA) were calculated separately for the cortex and for the medulla and compared between healthy and transplanted kidneys. Furthermore, the correlation between diffusion parameters and estimated GFR was determined.
Results:
The ADC in the cortex and in the medulla were lower in transplanted than in healthy kidneys (p < 0.01). Differences were more distinct for FA, especially in the renal medulla, with a significant reduction in allografts (p < 0.001). Furthermore, in transplanted patients a correlation between mean FA in the medulla and estimated GFR was observed (r = 0.72, p < 0.01). Tractography visualized changes in renal microstructure in patients with impaired allograft function.
Conclusions:
Changes in allograft function and microstructure can be detected and quantified using DTI. However, to prove the value of DTI for standard clinical application especially correlation of imaging findings and biopsy results is necessary.
Insights
Diffusion tensor imaging (DTI) can detect kidney allograft dysfunction and microstructural changes. This non-invasive tool shows promise, but further validation against biopsy results is needed for clinical use.
Area of Science:
- Radiology
- Nephrology
- Medical Imaging
Background:
- Allograft dysfunction and microstructural changes are critical indicators of kidney transplant health.
- Non-invasive diagnostic tools are needed to accurately assess allograft status.
- Diffusion Tensor Imaging (DTI) offers potential for evaluating tissue microstructure.
Purpose of the Study:
- To evaluate MR diffusion tensor imaging (DTI) as a non-invasive diagnostic tool.
- To detect acute and chronic allograft dysfunction.
- To assess changes in kidney allograft microstructure.
Main Methods:
- 15 kidney transplant patients and 14 healthy volunteers were examined using DTI at 1.5 T.
- Mean apparent diffusion coefficient (ADC) and fractional anisotropy (FA) were calculated for cortex and medulla.
- Correlation between diffusion parameters and estimated GFR was determined.
Main Results:
- Lower ADC values were observed in the cortex and medulla of transplanted kidneys compared to healthy kidneys.
- Fractional anisotropy (FA) was significantly reduced in allografts, particularly in the renal medulla.
- A correlation was found between mean FA in the medulla and estimated GFR in transplanted patients.
Conclusions:
- DTI can detect and quantify changes in allograft function and microstructure.
- Further studies correlating DTI findings with biopsy results are necessary for clinical application.
- DTI shows potential as a non-invasive tool for monitoring kidney allografts.
Related Concept Videos
01:28Imaging Studies I: Kidney, Ureter, and Bladder Studies
01:17Assessment of Diffusion and Perfusion
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
01:19Imaging Studies VII: Vascular Imaging