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Diffusion Imaging in the Rat Cervical Spinal Cord
Published on: April 7, 2015
In vivo assessment of optimal b-value range for perfusion-insensitive apparent diffusion coefficient imaging
Moti Freiman1, Stephan D Voss, Robert V Mulkern
1Moti Freiman, Computational Radiology Laboratory, Department of Radiology, Boston Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston Massachusetts 02115, USA. moti.freiman@childrens.harvard.edu
Medical Physics
|August 17, 2012
Summary
Optimizing b-values in diffusion-weighted MRI (DW-MRI) is crucial for accurate apparent diffusion coefficient (ADC) imaging. Careful selection of b-values and estimation methods minimizes perfusion-related errors in abdominal organ ADC measurements.
Area of Science:
- Medical Imaging
- Radiology
- Biophysics
Background:
- Diffusion-weighted MRI (DW-MRI) is essential for assessing tissue microstructure.
- Apparent diffusion coefficient (ADC) quantification is sensitive to perfusion effects, especially in abdominal organs.
- Intravoxel Incoherent Motion (IVIM) modeling provides a reference standard for perfusion-insensitive ADC (ADC(IVIM)).
Purpose of the Study:
- To determine optimal b-value ranges for perfusion-insensitive ADC imaging in abdominal organs.
- To evaluate the performance of different ADC estimation methods with short DW-MRI acquisitions.
- To minimize relative root mean square error (RRMS) between estimated ADC and reference ADC(IVIM).
Main Methods:
- Acquired DW-MRI data from 15 subjects with b-values ranging from 5 to 800 s/mm².
- Computed reference ADC(IVIM) using a biexponential IVIM model.
- Generated simulated data and calculated monoexponential ADC estimates using two-point (ADC(2)), three-point (ADC(3)), and Rician noise model (ADC(R)) estimators.
- Minimized RRMS between ADC(IVIM) and monoexponential ADC estimates across various b-value combinations and organs.
Main Results:
- The ADC(3) estimator achieved <5% RRMS with simulated data using b-values of 300 and 1200 s/mm².
- For in vivo data, ADC(3) achieved <7% RRMS with b-values of 270 and 800 s/mm².
- All estimators showed a strong correlation between RRMS and the IVIM perfusion fraction (r = 0.78–0.83, p ≤ 0.003).
Conclusions:
- Perfusion significantly impacts ADC estimates in short-duration DW-MRI of abdominal organs.
- The choice of b-values and estimation method critically influences perfusion-related errors.
- Perfusion-induced errors in ADC can be reduced to below 7% through careful selection of b-values and estimation techniques.
