Abstract parkinson disease pd is associated with nigral degeneration and striatal dopamine deficiency demonstrating midbrain structural abnormalities with transcranial sonography or diffusion weighted mri or showing striatal dopamine terminal dysfunction with pet or spect supports the diagnosis and rationalizes the use of dopaminergic medications. Introduction the diagnosis of parkinsons disease pd is mainly based on clinical features and does not rely on imaging biomarkers commonly used imaging techniques in pd include positron emission tomography pet and single photon emission computed tomography spect but conventional magnetic resonance imaging mri is of little use in clinical practice. Rather use of imaging is most helpful when the diagnosis is uncertain or when physicians are looking for changes in the brain that are more typical of one of several parkinsonian syndromes and not idiopathic parkinsons and other conditions that can mimic parkinsons imaging studies to evaluate parkinsons disease and parkinsonian . Parkinson disease pd also known as idiopathic parkinsonism is a neurodegenerative disease and movement disorder characterized by resting tremor rigidity and hypokinesia due to progressive degeneration of dopaminergic neurons in the substantia nigra. Imaging tests use medical equipment to takes pictures of the body showing what is occurring on the inside there are several different imaging tests that may be used to assist doctors in making a diagnosis of parkinsons disease pd as well as ruling out other conditions however many of these tests are expensive not covered by insurance and do not necessarily help with the diagnosis
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