Checking whether a new brain scan gives consistent results

Inclusion Criteria: * Key inclusion criteria: Patients with MSA fulfilling both the criteria for probable MSA (Gilman et al., 2008) and clinically established MSA (Wenning et al., 2022), patients with PD fulfilling the criteria for clinically established PD (Postuma et al., 2015) or age-matched healthy controls (AMHC). Exclusion Criteria: 1. Laboratory tests with clinically significant abnormalities and/or clinically significant unstable medical illness equivalent to CTC v5.0 (common toxicity criteria) toxicities greater than grade 2. 2. Evidence of clinically significant disease that is expected to interfere with cognitive assessments or the ability to complete the trial procedures as judged by the investigator. 3. Clinically significant renal and hepatic dysfunction as judged by the investigator. 4. Known hypersensitivity to the active substance or to any of the excipients of \[11C\]MODAG-005 solution for injection. 5. Known hypersensitivity to the active substance or to any of the excipients in anle138b (Emrusolmin) capsules. 6. Participant has received an investigational drug within 3 months of screening. 7. Blood donations within 7 days before enrolment. 8. Pregnant (see 9.1.5) or breast-feeding or having the intention of getting pregnant. Female participants of childbearing potential and male participants with female partners of childbearing potential not willing to practice effective contraception during the trial period and for 90 days following each PET/CT scan. 9. Unsuitable veins for repeated venipuncture. 10. Contraindication to blood sampling and/or arterial cannulation, including but not limited to allergy to local anesthetics, peripheral vascular disease, Raynaud's phenomenon as determined by abnormal Allen's test on both arms or abnormal coagulation profile at screening. If Allen's test should be "abnormal" on both arms, the participant will not be eligible for arterial sampling, but will participate in the remaining assessments. 11. MRI exclusion criteria include but not limited to: findings of cerebrovascular disease (more than two lacunar infarcts, any territorial infarct \>1 cm\^3, or deep white matter abnormality corresponding to an overall Fazekas scale of 3 with at least one confluent hyperintense lesion on the Fluid-Attenuated Inversion Recov ery (FLAIR) sequence that is \>20 mm in any dimension), infectious disease, space-occupying lesions normal pressure hydrocephalus or any other abnormalities associated with central nervous system (CNS) disease. Findings that are expected to be present in the PD and MSA participants (e.g. absence of swallow tail sign, presence of regional atrophy or hot cross bun sign) do not lead to exclusion of these participants. 12. Implants such as implanted cardiac pacemakers or defibrillators, insulin pumps, cochlear implants, metallic ocular foreign body, implanted neural stimulators, CNS aneurysm clips and other medical implants that have not been certified for MRI, or history of claustrophobia in MRI. 13. Unwilling and/or unable to cooperate with trial procedures. Exclusion criteria for age-matched healthy controls: 14. Relevant hepatic parameters above upper limit of normal (ULN), i.e., glutamic pyruvic transaminase (GPT), glutamic oxaloacetic transaminase (GOT), bilirubin 15. Relevant renal parameters outside normal limits, i.e., serum creatinine and blood urea nitrogen (BUN) above ULN; urinary albumin-creatinine ratio (uACR) below lower limit of normal (LLN) 16. Systolic blood pressure \<90 or \>140 mmHg; diastolic blood pressure \<45 or \>90 mmHg; heart rate \<50 or \>95 beats per minute (BPM)