Multimodal Image Guidance in Subthalamic Deep Brain Stimulation for Parkinson's Disease

BackgroundAccurate electrode placement and individual stimulation parameters influence the outcomes of subthalamic deep brain stimulation in Parkinsons disease. Neuroimaging-based models can help evaluate how electrode placement impacts improvement, aiming to reduce the burden of DBS programming. However, most existing models have been developed to explain differences between patients rather than differences between contacts within the same patient, leaving the clinical relevance of image-guided programming unclear. MethodsWe analyzed data from patients with Parkinsons disease treated with subthalamic deep brain stimulation to develop and validate a neuroimaging-informed model of motor improvement measured by the Unified Parkinsons Disease Rating Scale. Five approaches were tested: active contact coordinates, electric fields, tract activations, as well as structural and functional networks. All approaches were integrated into a combined ridge regression model and validated using two hold-out datasets. ResultsThe sample included 236 patients (604 stimulation sites), divided into a training cohort (N = 129), a retrospective validation cohort (N = 89), and a prospectively acquired validation cohort (N = 21 electrodes). Consistent with expectations, our model explained approximately 11% of the variance in unseen group-level data (R2 = 0.11, p = 0.001). At the individual level, the model identified the optimal clinical contact or its neighboring contact in all but one case (mixed-effects R2= 0.32, p = 1 x 10-16). ConclusionThe imaging-informed model explained the expected variance at the group level and demonstrated potential for guiding stimulation programming, suggesting that image-guided approaches may improve clinical decision-making while reducing the need for lengthy postoperative testing.