TMS Mapping at Inspire: Dr. Clinch on Coil Positioning & Dose

When patients ask what makes TMS precise, the answer is: mapping. At Inspire TMS Denver, Dr. Samuel Clinch and the team treat mapping not as a quick formality but as the clinical step that determines where we stimulate and how strongly - two things that have a direct effect on outcomes. Below, we walk through what mapping is, why it matters, how small changes can improve results, and what patients can expect when Dr. Clinch creates their individualized TMS map.
What is motor-threshold mapping - and why do we do it?
Motor-threshold mapping is the clinical process used to find the stimulation intensity and the precise coil position that reliably activates a known brain response (usually a small, measurable twitch of a hand muscle). That response tells the team how much magnetic energy reaches the brain at a given location and helps set a safe, effective dose for therapeutic targets. Mapping lets us:
- Personalize the dose. Everyone’s skull thickness, cortical anatomy, and responsiveness are different; motor-threshold mapping determines the appropriate stimulation intensity for your brain.
- Find the best coil location. Small shifts in coil position or angle change, which brain circuits get stimulated - mapping helps us locate the spot that best connects to the circuit we want to influence.
- Increase safety and predictability. Mapping is performed before any therapeutic session (standard or accelerated), so we deliver a dose matched to your physiology, reducing risk and improving reproducibility.
Dr. Clinch’s clinical priorities during mapping
Dr. Clinch’s mapping approach emphasizes three things: precision, comfort, and context.
Precision: mapping is done by a clinician-trained team under physician oversight, so coil position and intensity are documented and repeatable. This means we don’t “guess” - we measure and record.
Comfort: mapping and initial sessions are paced with patient comfort in mind. If a patient is anxious or uncomfortable, we adjust breaks and pacing while maintaining diagnostic integrity.
Contextual decision-making: Dr. Clinch interprets mapping data in the context of a patient’s history, current medications, prior TMS (if any), and treatment goals. That lets him recommend standard vs. accelerated schedules, conservative dosing for medically complex patients, or remapping when prior TMS results change.
How small changes in coil position or dose matter
It’s tempting to think “a few millimeters won’t change much,” but in TMS, a small positional or angle change can alter which connected brain circuit receives the strongest stimulation. Practically:
- A slight anterior/posterior shift may move stimulation onto cells with different functional connections.
- A small rotation of the coil changes the vector of induced current and can alter effectiveness or side-effect profile.
- A modest intensity adjustment (a few percent of motor threshold) can change how reliably synaptic pathways are recruited.
Because of this sensitivity, the Inspire team documents coil coordinates and intensity on every mapping so treatment sessions reproduce the same physiological conditions each time. If outcomes aren’t as expected, the team often
remaps and makes micro-adjustments - a step that frequently clarifies whether dose or position needs refinement.

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Mapping for accelerated & One-Day protocols
Accelerated courses (including One-Day options) compress many stimulation sessions into a short time. That makes precise mapping even more important:
- Accelerated dosing amplifies the effect of small errors. When you deliver many sessions close together, any systematic misplacement or incorrect dose can repeat the same sub-optimal stimulation.
- Dr. Clinch insists on mapping before any compressed plan. The physician-led model at Inspire ensures that apping informs the entire accelerated plan so safety and effectiveness are preserved.
How medications & clinical context influence mapping
Medications that affect excitability (or seizure threshold) are reviewed before mapping so the team understands any additional risk. If a medication raises concern, the clinician may adapt intensity or pacing or communicate with the prescribing clinician to coordinate care. This medication-aware mapping step is standard practice at Inspire and is part of the safety screen that precedes accelerated treatment.
Remapping: when and why we do it
Remapping isn’t unusual - it’s a clinical tool. Common reasons to remap include:
- A prior course of TMS that didn’t produce the expected benefit (we may remap to see if a different coil position or dose helps).
- Changes in medications or medical status that could affect cortical excitability.
- Transitioning from a standard to an accelerated protocol (or vice-versa), where a fresh mapping ensures correct dosing for the different format.
Remapping allows Dr. Clinch to make evidence-based, small adjustments that often improve the patient trajectory without changing the overall therapy plan.
What to expect during your mapping visit (patient checklist)
Before you come
Bring a current medication list (names, doses). This speeds the safety review.
At the visit
- Brief physician consult & safety screen.
- Motor-threshold mapping (we identify the motor response and set stimulation as a percent of that threshold).
- Documentation of coil position and intensity so every treatment session is reproducible.
- Discussion of the recommended protocol (standard, iTBS, accelerated/One-Day) and what to expect for comfort and scheduling.
After mapping
You’ll receive a summary of your map and recommended plan; the team will track outcomes and remap if needed.
Does mapping hurt?
Mapping is well tolerated. You may feel brief scalp tapping and one or two small muscle twitches - discomfort is usually minor and short-lived.
How long does mapping take?
Any priming that affects excitability would be managed to preserve comfort and safety; our priority is to ensure we can adjust pacing or dosing as needed.
If I had TMS elsewhere, do you use their map?
Prior mapping notes are very helpful, but we commonly remap because small differences in equipment and coil positioning mean that a fresh mapping ensures accurate dosing for Inspire’s devices and protocols.

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