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DAT-SPECT (Dopamine Transporter Scan in Parkinson Disease)

Single-photon emission CT imaging with I-123 ioflupane (DaTscan) to evaluate presynaptic dopamine transporter density in striatum, distinguishing Parkinson disease from essential tremor and drug-induced parkinsonism.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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What is DAT-SPECT (Dopamine Transporter Scan in Parkinson Disease)?

DAT-SPECT with I-123 ioflupane (DaTscan, Ioflupane I-123 injection) is a functional nuclear medicine imaging modality that visualizes presynaptic dopamine transporter (DAT) density in the striatal nigrostriatal terminals.

The radiotracer is injected intravenously and binds to dopamine transporters with imaging performed 3-6 hours later. Normal scan shows symmetric comma- or crescent-shaped uptake in caudate and putamen; in Parkinson disease, asymmetric posterior putaminal reduction is the earliest finding.

Indications include differentiation of Parkinson disease (PD) from essential tremor (ET) or drug-induced parkinsonism, evaluation of clinically uncertain parkinsonism, support for diagnosis of dementia with Lewy bodies (vs Alzheimer disease), and pre-treatment staging in selected research studies.

Symptoms

Parkinsonian motor symptoms (tremor, bradykinesia, rigidity)
Diagnostic uncertainty between Parkinson disease and essential tremor
Suspected drug-induced parkinsonism (vs primary degeneration)
Atypical parkinsonian syndromes (MSA, PSP, CBD)
Cognitive decline with parkinsonism (dementia with Lewy bodies)
Asymmetric onset and progression
Poor response to levodopa raising diagnostic question

Risk Factors

Pregnancy and breastfeeding (relative contraindications)
Iodine allergy or thyroid disease (potassium iodide premedication)
Drugs that affect DAT (cocaine, amphetamines, modafinil) requiring discontinuation
Renal impairment (radiotracer excretion)
Severe motor fluctuations or inability to remain still during imaging
Age extremes (pediatric use rare, off-label)
Recent CNS imaging with iodinated contrast

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Parkinsonian symptoms with diagnostic uncertainty
  • Tremor that is difficult to classify (PD vs ET vs drug-induced)
  • Atypical features (early falls, rapid progression, autonomic dysfunction)
  • Cognitive decline with parkinsonism (suspected DLB)
  • Failure of dopaminergic therapy raising alternative diagnosis
  • Pre-treatment confirmation before initiating long-term therapy
  • Specialist movement disorder consultation

Treatment Methods

01
Discontinue interfering drugs (cocaine, amphetamines, methylphenidate) for 5 half-lives
02
Thyroid blockade with potassium iodide 1 hour before injection
03
I-123 ioflupane 111-185 MBq IV injection
04
SPECT imaging 3-6 hours after injection (high-resolution multi-headed gamma camera)
05
Visual and semi-quantitative analysis (specific binding ratios in caudate and putamen)
06
Comparison with reference databases for age-matched controls
07
Integration with clinical findings and other imaging (brain MRI)

Which Department to Visit?

You can visit our Radyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.