Probabilistic tractography of the posterior subthalamic area in Parkinson’s disease patients

M. G. García-Gomar, Luis Concha, S. Alcauter, J. Soto Abraham, J. D. Carrillo-Ruiz, G. Castro Farfan, Francisco Velasco Campos

National Institute of Psychiatry “Ramón de la Fuente Mu?iz”, México City, México.
Neurobiology Institute, UNAM Campus Juriquilla, Juriquilla, Querétaro, México.
Unit for Stereotactic and Functional Neurosurgery and Radiosurgery, México General Hospital, México City, México.

DOI: 10.4236/jbise.2013.63A048                

Abstract

Deep brain stimulation (DBS) is a non-pharmacological treatment for Parkinson’s disease (PD), and its efficacy depends largely on which anatomical structure (target) is stimulated. The subthalamic nucleus (STN) is one of the most commonly used targets, but stimulation of new targets within the posterior sub-thalamic area (PSA), comprising a group of white matter fibers known as prelemniscal radiations (Raprl), as well as the caudal zonaincerta nucleus (Zic), have proven to be superior at improving certain clinical symptoms. Despite their clinical usefulness, their anatomical connectivity has not been completely described in humans. We performed constrained spherical deconvolution of the signal in diffusion-weighted images and subsequent tractography as a means to non-invasively define the connectivity of the Raprl and Zic in a group of five patients with PD. Further, we used track-density imaging, a novel method to improve the spatial resolution of the acquired images, in order to visualize the small subregions that comprise the PSA with a voxel resolution of 0.2 × 0.2 × 0.2 mm³. Both Raprl and Zic demonstrated high probability of connectivity with the dorsal brainstem, cerebellum, subcortical nuclei (globus pallidum ventral, lateral thalamic nuclei), and cortical areas (orbitofrontal cortex, primary and supplementary motor cortex areas). The connectivity patterns were re-producible between patients and were discretely organized as the tracts entered/exited the PSA, depending on their end points. These findings indicate that the PSA is part of the neuronal circuitry controlling movement, and the precise characterization of its connectivity will aid in our understanding of the net-works involved in PD and how they can be modulated with DBS in order to alleviate symptoms.

Keywords

Parkinson Disease (PD); Posterior Subthalamic Area (PSA); Tractography; Track-Density Images (TDI)

Conflicts of Interest

The authors declare no conflicts of interest.

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