Objective: Primary objective of the study is to determine whether brain network visualization using 7T MRI and MEG improves motor symptoms as measured by the disease-specific Unified Parkinson's Disease Rating Scale (UPDRS-III) and Tremor Assessment Rating Scale (TETRAS); and quality of life as measured by the Parkinson's Disease Questionnaire 39 (PDQ-39). Secondary outcomes are: disease related daily functioning, adverse effects, operation time, quality of life (QUEST), patient satisfaction with treatment outcome and patient evaluation of treatment burden. Study design: Single-center, prospective study with repeated measures; standardized assessments of motor skills and quality of life (UPDRS-III, TETRAS, PDQ-39) after DBS placement will be compared with scores after adjustments based on network analyses. Study population: Enrollment will be ongoing from April 2024. Intervention (if applicable): Patients with DBS for a minimum of six months will undergo an additional MEG scan. Application of 7T MRI for DBS is standard care and outcome scores used will be readily accessible from the already existing advanced electronic DBS database. Main study parameters/endpoints: The co-primary outcome measures are the change in motor symptoms (measured by the UPDRS-III,TETRAS) and quality of life (measured by the PDQ-39). This is measured as part of standard care. The secondary outcome measures are the Amsterdam Linear Disability Score for functional health status, Starkstein apathy scale, Quality of Life Questionnaire in Essential Tremor (QUEST), patient satisfaction with the treatment, patient evaluation of treatment burden, operating time, hospitalization time, change of tremor medication, side effects and complications. The primary and secondary outcome scores are already stored in our advanced electronic DBS database. Nature and extent of the burden and risks associated with participation, benefit and group relatedness: The 7-Tesla MRI and MEG protocols (including stimulation parameters) already developed by our group and reported in (five) studies will be applied. After selecting the best DBS programming, the aim is to optimize DBS outcome by: a) increasing the mean improvement in motor function and quality of life by at least 10% and b) achieving a minimum of 30% improvement in motor function for each patient (measured by standardized assessment of motor function and quality of life). The proposed research project involves treatment options that are non-invasive and/or part of standard care in daily practice. The therapies will not be combined with other research products. Participation in this study constitutes negligible risk according to NFU criteria for human research.