Deep Brain Stimulation (DBS) is a neurosurgical procedure that can reduce symptoms in medically intractable obsessive-compulsive disorder (OCD). Conceptually, DBS of the ventral capsule/ventral striatum (VC/VS) region targets reciprocal excitatory connections between the orbitofrontal cortex (OFC) and thalamus, decreasing abnormal reverberant activity within the OFC-caudate-pallidal-thalamic circuit. In this study, we investigated these connections using diffusion magnetic resonance imaging (dMRI) on human connectome datasets of twenty-nine healthy young-adult volunteers with two-tensor unscented Kalman filter based tractography. We studied the morphology of the lateral and medial orbitofrontothalamic connections and estimated their topographic variability within the VC/VS region. Our results showed that the morphology of the individual orbitofrontothalamic fibers of passage in the VC/VS region is complex and inter-individual variability in their topography is high. We applied this method to an example OCD patient case who underwent DBS surgery, formulating an initial proof of concept for a tractography-guided patient-specific approach in DBS for medically intractable OCD. This may improve on current surgical practice, which involves implanting all patients at identical stereotactic coordinates within the VC/VS region.
Bibliographical noteFunding Information:
This study was supported, in part, by grants from: NIH, NIBIB R21EB016449 (NM and GB); from NIH, 5 UO1 MH 093765-05 (LW, QF and AN); from NIMH, RO1MH097979 (YR); from NIMH, R01 MH102377 (MK and NM); from Colby College Research Fund 01 2836 (EY); from Medtronic, Cyberonics, Roche and Eli Lilly and Company (DD).
- Deep brain stimulation (DBS)
- Diffusion tensor imaging
- Diffusion tractography
- Obsessive-compulsive disorder (OCD)
- Tractography-guided DBS