Journal article
Image registration for triggered and non-triggered DTI of the human kidney: reduced variability of diffusion parameter estimation.
- Seif M Departments of Clinical Research and Radiology, University of Bern, Bern, Switzerland.
- Lu H
- Boesch C
- Reyes M
- Vermathen P
- 2014-06-26
Published in:
- Journal of magnetic resonance imaging : JMRI. - 2015
DTI
image registration
kidney
respiratory triggering
Adolescent
Adult
Algorithms
Artifacts
Diffusion Tensor Imaging
Female
Humans
Image Enhancement
Image Interpretation, Computer-Assisted
Kidney
Male
Middle Aged
Motion
Reference Values
Reproducibility of Results
Respiratory-Gated Imaging Techniques
Sensitivity and Specificity
Subtraction Technique
Young Adult
English
BACKGROUND
To investigate if non-rigid image-registration reduces motion artifacts in triggered and non-triggered diffusion tensor imaging (DTI) of native kidneys. A secondary aim was to determine, if improvements through registration allow for omitting respiratory-triggering.
METHODS
Twenty volunteers underwent coronal DTI of the kidneys with nine b-values (10-700 s/mm(2) ) at 3 Tesla. Image-registration was performed using a multimodal nonrigid registration algorithm. Data processing yielded the apparent diffusion coefficient (ADC), the contribution of perfusion (FP ), and the fractional anisotropy (FA). For comparison of the data stability, the root mean square error (RMSE) of the fitting and the standard deviations within the regions of interest (SDROI ) were evaluated.
RESULTS
RMSEs decreased significantly after registration for triggered and also for non-triggered scans (P < 0.05). SDROI for ADC, FA, and FP were significantly lower after registration in both medulla and cortex of triggered scans (P < 0.01). Similarly the SDROI of FA and FP decreased significantly in non-triggered scans after registration (P < 0.05). RMSEs were significantly lower in triggered than in non-triggered scans, both with and without registration (P < 0.05).
CONCLUSION
Respiratory motion correction by registration of individual echo-planar images leads to clearly reduced signal variations in renal DTI for both triggered and particularly non-triggered scans. Secondarily, the results suggest that respiratory-triggering still seems advantageous.
To investigate if non-rigid image-registration reduces motion artifacts in triggered and non-triggered diffusion tensor imaging (DTI) of native kidneys. A secondary aim was to determine, if improvements through registration allow for omitting respiratory-triggering.
METHODS
Twenty volunteers underwent coronal DTI of the kidneys with nine b-values (10-700 s/mm(2) ) at 3 Tesla. Image-registration was performed using a multimodal nonrigid registration algorithm. Data processing yielded the apparent diffusion coefficient (ADC), the contribution of perfusion (FP ), and the fractional anisotropy (FA). For comparison of the data stability, the root mean square error (RMSE) of the fitting and the standard deviations within the regions of interest (SDROI ) were evaluated.
RESULTS
RMSEs decreased significantly after registration for triggered and also for non-triggered scans (P < 0.05). SDROI for ADC, FA, and FP were significantly lower after registration in both medulla and cortex of triggered scans (P < 0.01). Similarly the SDROI of FA and FP decreased significantly in non-triggered scans after registration (P < 0.05). RMSEs were significantly lower in triggered than in non-triggered scans, both with and without registration (P < 0.05).
CONCLUSION
Respiratory motion correction by registration of individual echo-planar images leads to clearly reduced signal variations in renal DTI for both triggered and particularly non-triggered scans. Secondarily, the results suggest that respiratory-triggering still seems advantageous.
- Language
-
- English
- Open access status
- closed
- Identifiers
-
- DOI 10.1002/jmri.24671
- PMID 24962556
- Persistent URL
- https://sonar.ch/global/documents/240045
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