Open Label Study for the Use of Transcranial Ultrasound Treatment of Tremor

Inclusion Criteria: In order for a subject to be considered for the Essential Tremor application of this study, the following criteria are required: Subjective complaint of tremor assessed and validated by physician Must be willing to comply with the study protocol English Proficiency At least 18 years of age At most 90 years of age In order for a subject to be considered for the Parkinson's Disease application of this study, the following criteria are required: Diagnosis of Parkinson's Disease validated by physician Must be willing to comply with the study protocol English Proficiency At least 18 years of age At most 90 years of age Exclusion Criteria: In order for a subject to be considered for this study, he/she may NOT have any of the following: Subjects not English proficient Subjects unable to give informed consent Subjects do not meet age requirements (18-90) Subjects who would not be able to lay down without excessive movement in a calm environment sufficiently long enough to be able to achieve sleep Pregnancy, women who may become pregnant or are breastfeeding Women with child-bearing potential who are not willing to use a double-barrier birth control method Males not willing to use a double-barrier birth control method with female sex partners with child-bearing potential Advanced terminal illness Any active cancer or chemotherapy Any other neoplastic illness or illness characterized by neovascularity Macular degeneration Subjects with scalp rash or open wounds on the scalp (for example from treatment of squamous cell cancer)