| 123I-β-CIT | 123I 2β-carboxymethoxy-3β-(4-iodophenyl)tropane |
| 123I-IBF | 123I iodobenzofuran |
| 123I-IBZM | 123I iodobenzamide |
| 123I-FP-CIT | 123I N-ω-fluoropropyl-2β-carbomethoxy-3β-(4-iodophenyl)nortropane |
| 123I-IPT | 123I N-(3-iodopropen-2-yl)-2β-carbomethoxy-3β-(4-chlorophenyl)tropane |
| 123I-MIBG | 123I metaiodobenzylguanidine |
| 123I-IMP | 123I iodoamphetamine |
| 4R-tau | four-repeat tau isoforms |
| 99mTc-ECD | 99mTc ethylcysteinate dimer |
| 99mTc-TRODAT-1 | [2-[[2-[[[3-(4-chlorophenyl)-8-methyl-8-azabicyclo [3,2,1]oct-2-yl]methyl](2-mercaptoethyl)amino]ethyl]amino]ethanethiolato(3-)-N2,N20,S2,S20]oxo [1R-(exo-exo)])-[99mTc] dopamine transporter |
| AD | Alzheimer’s disease |
| ALS | amyotrophic lateral sclerosis |
| APD | atypical Parkinsonian disorders |
| AUC | area under the curve |
| CBD | corticobasal degeneration |
| CSF | cerebrospinal fluid |
| DaT-SPECT | dopamine transporter single-photon emission computed tomography |
| DIP | drug-induced Parkinsonism |
| DLB | dementia with Lewy bodies |
| ET | essential tremor |
| FTD | frontotemporal dementia |
| FDG-PET | fluorodeoxyglucose positron emission tomography |
| DaT-PET | dopamine transporter positron emission tomography |
| HVA | homovanillic acid |
| HY | Hoehn and Yahr Scale |
| IGF-1 | insulin-like growth factor-1 |
| NfL | neurofilament light chain |
| NPV | negative predictive value |
| MAPT | microtubule-associated protein tau |
| MDS | Movement Disorders Society |
| MRI | magnetic resonance imaging |
| MRPI | magnetic resonance Parkinsonism index |
| MSA | multiple system atrophy |
| MSA-C | MSA-cerebellar type |
| MSA-P | MSA with predominant Parkinsonism |
| NINDS | National Institute of Neurological Disorders and Stroke |
| NPH | normal pressure hydrocephalus |
| PD | Parkinson’s disease |
| PDD | PD dementia |
| pNfH | phosphorylated neurofilament heavy chain |
| PPAOS | primary progressive apraxia of speech |
| PSP | progressive supranuclear palsy |
| PSP-P | PSP with predominant Parkinsonism |
| PSP-PGF | PSP with progressive gait freezing |
| PSP-PI | PSP with postural instability |
| PSP-RS | PSP-Richardson syndrome |
| PSP-SL | PSP with speech and language impairment |
| ROI | region of interest |
| SAI | striatal asymmetry index |
| SANRA | scale for the quality assessment of narrative review articles |
| SBR | specific binding ratio |
| SPECT | single-photon emission computed tomography |
| SSR | sympathetic skin response |
| VaP | vascular Parkinsonism |