Study design: This is a prospective, open-label, single-center, and sponsor-initiated clinical trial. The clinical trial follows the Clinical Investigation Plan, GCP. Objective: The objective of the clinical trial is to evaluate improving Parkinson's disease motor features by MR-guided focused ultrasound surgery (Patient who has less effectiveness.).

Endpoint: All PD003J treated subjects will be followed up for 4 months. The primary endpoints will be safety of unilateral, PD003J subthalamotomy for PD. The endpoint will be determined from adverse events recorded during the 4 months period for safety. Secondary endpoints will include changes in MDS-UPDRS, levodopa equivalent medication, Global Impression of Change and so on.

Primary endpoint of safety: Incidence and severity of adverse events (AE/AEs) associated with PD003J treatment of idiopathic PD at 4 months post treatment. Safety will be evaluated individually for each subject who is treated. An analysis of safety will be performed on all treated subjects and will be determined by an evaluation of the incidence and severity of device- and procedure-related complications. In particular, in this study, the incidence of severe involuntary movements (one-sided ballism) is confirmed. All AEs will be reported and categorized by investigators as definitely, probably, possibly, unlikely, or unrelated to the device, subthalamotomy procedure, and/or Parkinson's disease progression.

Secondary endpoints: Secondary endpoints will include both comparison of baseline to 1 week visit, 2-month visit and baseline to 4-month visit assessments for the following: • MDS-UPDRS parts I, II, III, and IV • Levodopa equivalent medication usage (milligrams) • Patient and Physician Global Impression of Change • Patient Satisfaction Questionnaire.

Inclusion Criteria:

1. Men and women, age 30 years and older
2. Subjects who are able and willing to give informed consent and able to attend all study visits through 4 Months
3. Subjects with a diagnosis of Parkinson's Disease using the MDS criteria as confirmed by a movement disorder neurologist at the site
4. Predominant disability from one side of the body (i.e. unilateral or markedly asymmetric disease) as determined by a movement disorders neurologist
5. Subjects should be on a stable dose of all PD medications for 30 days prior to study entry.
6. Topographic coordinates of the subthalamic nucleus are localizable on MRI so that it can be targeted by the PD003J.
7. Subject is able to communicate sensations during the PD003J procedure.
8. Subject cannot obtain with drugs for treating Parkinson's disease.

Exclusion Criteria:

1. Hoehn and Yahr stage in the ON medication state of 2.5 or greater

2. Presence of severe dyskinesia as noted by a score of 3 or 4 on questions 4.1 and 4.2 of the MDS-UPDRS

3. Presence of other central neurodegenerative disease suspected on neurological examination. These include: multisystem atrophy, progressive supranuclear palsy, corticobasal syndrome, dementia with Lewy bodies, and Alzheimer's disease.

4. Any suspicion that Parkinsonian symptoms are a side effect from neuroleptic medications

5. Subjects who have had deep brain stimulation or a prior stereotactic ablation of the basal ganglia

6. Presence of significant cognitive impairment defined as score ≤ 21 on the Montreal Cognitive Assessment (MoCA)

7. Unstable psychiatric disease, defined as active uncontrolled depressive symptoms, psychosis, delusions, hallucinations, or suicidal ideation. Subjects with stable, chronic anxiety or depressive disorders may be included provided their medications have been stable for at least 60 days prior to study entry and if deemed appropriately managed

8. Subjects with significant depression as determined following a comprehensive assessment. Significant depression is being defined quantitatively as a score of greater than 19 on the Beck Depression Inventory.

9. Subjects exhibiting any behavior(s) consistent with ethanol or substance abuse as defined by the criteria outlined in the DSM-IV as manifested by one (or more) of the following occurring within the preceding 12-month period:

   • Recurrent substance use resulting in a failure to fulfill major role obligations at work, school, or home (such as repeated absences or poor work performance related to substance use; substance-related absences, suspensions, or expulsions from school; or neglect of children or household).
   • Recurrent substance use in situations in which it is physically hazardous (such as driving an automobile or operating a machine when impaired by substance use)
   • Recurrent substance-related legal problems (such as arrests for substance related disorderly conduct)
   • Continued substance use despite having persistent or recurrent social or interpersonal problems caused or exacerbated by the effects of the substance (for example, arguments with spouse about consequences of intoxication and physical fights).

10. Subjects with unstable cardiac status including:

    • Unstable angina pectoris on medication
    • Subjects with documented myocardial infarction within six months of protocol entry
    • Significant congestive heart failure defined with ejection fraction < 40
    • Subjects with unstable ventricular arrhythmias
    • Subjects with atrial arrhythmias that are not rate-controlled

11. Severe hypertension (diastolic BP > 100 on medication)

12. History of or current medical condition resulting in abnormal bleeding and/or coagulopathy

13. Receiving anticoagulant (e.g. warfarin) or antiplatelet (e.g. aspirin) therapy within one week of focused ultrasound procedure or drugs known to increase risk or hemorrhage (e.g. Avastin) within one month of focused ultrasound procedure. For anticoagulants with washout period shorter than one week the minimum period of time between stopping this medication and ExAblate procedure will be in accordance with washout time as per official effective medication labeling.

14. Subjects with risk factors for intraoperative or postoperative bleeding as indicated by: platelet count less than 100,000 per cubic millimeter, a documented clinical coagulopathy, or INR coagulation studies exceeding the institution's laboratory standard

15. Patient with severely impaired renal function with estimated glomerular filtration rate <30mL/min/1.73m2 (or per local standards should that be more restrictive) and/or who is on dialysis;

16. Subjects with standard contraindications for MR imaging such as non-MRI compatible implanted metallic devices including cardiac pacemakers, size limitations, etc.

17. Significant claustrophobia that cannot be managed with mild medication.

18. Subject who weigh more than the upper weight limit of the MR table and who cannot fit into the MR scanner

19. Subjects who are not able or willing to tolerate the required prolonged stationary supine position during treatment.

20. History of intracranial hemorrhage

21. History of multiple strokes, or a stroke within past 6 months

22. Subjects with a history of seizures within the past year

23. Subjects with malignant brain tumors

24. Subjects with lower limbarterial blood flow disorder

25. Subjects with intracranial aneurysms requiring treatment or arterial venous malformations (AVMs) requiring treatment.

26. Any illness that in the investigator's opinion preclude participation in this study.

27. Subjects unable to communicate with the investigator and staff.

28. Subject is pregnant or lactating

29. Subjects who is enrolled or will be enrolled in clinical study or clinical research

30. Subjects who have an Overall Skull Density Ratio of 0.30 or less as calculated from the screening CT