Partial Separable Model Combined with Spatial Constraint for Interventional MRI Reconstruction

Motivation: Real time interventional MRI (i-MRI) is essential for MR image guided therapy, but the requirement of high temporal resolution presents a great challenge for reconstruction of real-time i-MRI. Goal(s): Our goal is modifying an improved Partial Separable (PS) model called PS-R model to explore the potential of the modified model to achieve real-time i-MRI. Approach: We modified PS-R model with spatial constraint (PS-RSC) and performed retrospective experiments on simulation intervention MRI images to verify the effectiveness of the PS-RSC model. Results: Satisfying results were obtained with only 7 k-space lines for reconstructing one frame, giving an acceleration up to 40 folds. Impact: The reconstruction results of the simulation experiment showed that our method could obviously accelerate the acquisition time with good needle positioning, thus suggesting it has the potential for many MR guided interventional MRI application scenarios, such as MR image-guided therapy.