SpinDoctor-IVIM: A virtual imaging framework for intravoxel incoherent motion MRI

Area of Science:

• Medical Imaging
• Biophysics
• Computational Biology

Background:

• Intravoxel incoherent motion (IVIM) imaging provides crucial perfusion and diffusion data for clinical MRI applications.
• Current biomarker discovery for IVIM imaging involves lengthy preclinical and clinical validation processes.
• Accelerating the development of novel IVIM imaging techniques is essential for clinical translation.

Purpose of the Study:

• To develop a virtual IVIM imaging framework to expedite the design, evaluation, and optimization of novel IVIM imaging approaches.
• To introduce SpinDoctor-IVIM, a novel finite element solver extending the SpinDoctor diffusion MRI simulation toolbox.
• To enhance the simulation of IVIM imaging signals by incorporating realistic physiological parameters.

Main Methods:

• Developed SpinDoctor-IVIM, a finite element solver that simulates IVIM signals by solving the generalized Bloch-Torrey partial differential equation.
• Integrated HemeLB, a Lattice Boltzmann blood flow simulator, to compute input velocity for SpinDoctor-IVIM.
• Incorporated volumetric microvasculature, intravascular diffusion, and inter-compartment permeability into the simulation framework.

Main Results:

• SpinDoctor-IVIM successfully simulates IVIM imaging signals with enhanced physiological realism.
• The framework accounts for complex microvascular structures and fluid dynamics.
• Simulations demonstrated the capability to model diffusion and permeability effects within the microvasculature.

Conclusions:

• The developed virtual IVIM imaging framework, SpinDoctor-IVIM, offers an efficient tool for advancing IVIM imaging research.
• This approach can significantly speed up the discovery and validation of IVIM-based biomarkers.
• The simulation framework provides a powerful platform for optimizing IVIM imaging protocols and understanding pathophysiological mechanisms.