ASA Health MD

SPECT: seeing how your brain works.

Single-Photon Emission Computed Tomography measures blood flow across your brain in three dimensions. Unlike MRI, which shows what the brain looks like, SPECT shows how it actually functions — region by region, at rest and during cognitive tasks.

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Brain imaging visualization showing regional activity patterns.

The Technology

What SPECT actually measures.

SPECT uses a small dose of a radiopharmaceutical tracer to measure cerebral blood flow. The tracer is taken up by brain tissue in proportion to local blood flow, which closely correlates with neural activity. A gamma camera then images the tracer distribution, building a three-dimensional functional map of which regions are working hard and which are not.

The result is not a structural picture — that is what MRI provides — but a functional one. Patterns of underactivity, overactivity, and asymmetry across brain regions correlate strongly with symptoms patients actually feel: attention, focus, mood, anxiety, sleep, post-injury cognitive changes.

A clinical visualization of brain activity scan data.

What It Surfaces

The patterns SPECT can reveal.

SPECT is particularly useful when symptoms suggest functional rather than structural brain change. Where MRI may appear normal, SPECT often shows the underlying pattern driving the symptoms.

  • Traumatic brain injury — characteristic decreases in activity even when MRI is normal, often years after the injury
  • Attention disorders — frontal-lobe activity patterns that explain executive function challenges
  • Anxiety and depression — limbic and frontal patterns differentiating clinical subtypes
  • Cognitive decline — early functional changes preceding any visible structural change on MRI
  • Toxic exposure — global suppression patterns suggesting environmental or medication-related impact
  • Post-COVID cognitive symptoms — emerging functional patterns clinical research is actively documenting
Detailed brain imaging interpretation in a clinical setting.

Candidates

Who SPECT is for.

SPECT is recommended when the picture is unclear after a complete neurological evaluation — when symptoms exist but structural imaging (MRI) is normal or unhelpful, and qEEG findings need additional context. It is particularly valuable for patients with post-concussion symptoms, atypical mood and attention presentations, and functional cognitive changes.

It is not the right test for everyone. Cost, radiation exposure (low but real), and the specific clinical question all factor in. We recommend SPECT when the answer it provides will meaningfully change the treatment plan.

A focused individual reflecting on their cognitive health.

The Process

What to expect, start to finish.

SPECT imaging happens at a partnered imaging facility; the interpretation and integration happen with Dr. Lee.

  1. 01

    Pre-scan consultation

    Review your symptoms, history, and goals to confirm SPECT is the right next step. Discuss preparation, radiation considerations, and what we are hoping to learn.

  2. 02

    Scan day — rest study

    Injection of a small tracer dose; quiet wait period for uptake; 20–30 minute scan while you rest. Total visit: about 90 minutes.

  3. 03

    Scan day — concentration study

    Optional second scan during a cognitive task to compare resting vs. working brain activity. Adds 60–90 minutes to the day. Recommended for many patients.

  4. 04

    Integrated interpretation

    Dr. Lee personally reviews your SPECT data alongside your evaluation findings, history, and any other imaging or testing. Not a remote-read radiology service.

  5. 05

    Results review

    1–2 hour session walking through findings together. You see your own scans, understand what the patterns mean, and leave with a specific treatment plan.

Why ASA Health MD

SPECT, integrated.

  • Functional view

    SPECT shows brain function — not just structure. It surfaces what is actually happening in real time, which is often what symptoms reflect.

  • Integrated reading

    Your SPECT is interpreted alongside your evaluation, qEEG if relevant, MRI if relevant, and full history — never as a standalone result.

  • Physician-led review

    Dr. Lee personally reviews your scans and walks you through them — not a faxed report from a remote radiologist.

  • Action-oriented

    The scan only matters if it changes what we do. Every SPECT result leads to specific next-step recommendations — not just a label.

Common Questions

What patients ask before scheduling a SPECT.

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Ready to learn more?

Schedule your SPECT consultation.

Begin with a 60-minute consultation with Dr. Lee. We will determine whether SPECT is the right tool for your specific clinical question — and what it would tell us if so.

Book Consultation(972) 612-1900

5508 W. Plano Parkway, Plano, TX 75093