TMS Targeting Methods: What Measurements, Navigation, and MRI Can Establish

A TMS target is the intended brain region for stimulation. Finding and repeatedly returning to that location is a practical part of treatment, but claims about targeting can become confusing. A method may improve the reproducibility of coil placement without yet proving a superior depression outcome. Another may use advanced imaging as one part of a broader protocol. Patients benefit from separating those claims before deciding what extra testing is worth.

Three different targeting questions

The first question is anatomical: where is the intended site relative to the head and brain? The second is procedural: can the clinic return to the planned location and orientation reliably? The third is clinical: does this targeting strategy improve outcomes compared with a relevant alternative? A service may have a strong answer to one question and limited evidence for another. Precision is valuable, but it is not itself a remission rate.

Methods can involve scalp measurements, anatomical navigation, or functional-connectivity information. The details vary by device and protocol. Patients do not need to learn to position a coil themselves, and this article is not a technical instruction guide. They can ask what method is used, why it is appropriate for the proposed treatment, and how the service verifies that the intended procedure is followed over time.

What functional connectivity adds conceptually

Functional-connectivity approaches use patterns of related brain activity to help select a target. In the Cole et al., Stanford Neuromodulation Therapy randomized trial, 2022, resting-state functional MRI was used to identify an individualized left prefrontal region related to the subgenual anterior cingulate network. This is more specific than simply obtaining an MRI image. A scan performed for another purpose does not automatically reproduce the targeting method used in that study.

The trial also used high-dose accelerated iTBS. Because those elements were delivered together, its randomized result does not isolate the clinical contribution of imaging alone. A claim that MRI targeting caused the entire benefit overstates what that design can establish. To compare targeting strategies directly, readers should look for studies in which other important treatment features are held appropriately comparable.

Established trial evidence does not require one universal method

The George et al., sham-controlled prefrontal rTMS trial, 2010 evaluated a defined prefrontal rTMS protocol against sham, and the Blumberger et al., THREE-D randomized noninferiority trial, 2018 compared two active stimulation patterns within its treatment framework. These studies remind readers that the evidence base contains more than one approach to delivering prefrontal stimulation. No single phrase such as personalized or standard tells the whole story about what was tested or how well a clinic implements it.

A more sophisticated label is therefore not enough to establish superiority over every other method. Conversely, absence of a particular imaging procedure does not automatically mean a service lacks an evidence-based protocol. Ask which published study most closely matches the actual treatment and which aspects differ. A clear explanation should connect the targeting method to the rest of the intervention rather than selling it in isolation.

Reproducibility matters across visits

Treatment is repeated, so ask how staff document location and orientation and what happens if positioning needs review. The answer may involve navigation, measurements, records, or other device-specific procedures. The clinical team should manage those details. A patient should report unusual discomfort, major changes in sensation, or a concern that positioning has become inconsistent, but should not attempt to correct the equipment independently.

Ask how staff are trained and who reviews a procedural concern. If a clinic changes targeting methods during a course, request an explanation of the clinical reason and how the change affects interpretation of progress. A change may be reasonable, but it should not be hidden behind a vague claim of optimization. Documenting the plan helps distinguish planned individualization from an unexplained departure from the proposed protocol.

Consider the burden of extra imaging

Ask whether imaging is required for the specific protocol, what it costs, and whether an additional scan is needed if an existing MRI is available. Some people may have difficulty with MRI because of implants, claustrophobia, or other circumstances requiring assessment. Do not assume that TMS eligibility and MRI eligibility are the same question. The relevant clinical teams must evaluate each procedure using its own requirements.

Our accelerated-protocol checklist explains why targeting should be examined alongside spacing and stimulation dose. The protocol evidence guide offers a broader framework for reading claims. A useful targeting conversation ends with a precise description of what is measured, how the coil is placed repeatedly, and what evidence supports the clinical claim—not merely an assurance that the treatment is more personalized than another service's offering.

Medical disclaimer: This article provides general education, not diagnosis, individualized treatment advice, or emergency care. Evidence and regulatory statements refer to the dated sources cited, not an exhaustive verification of all changes through October 30, 2026.

Sources

1. Cole et al., Stanford Neuromodulation Therapy randomized trial, 2022
2. George et al., sham-controlled prefrontal rTMS trial, 2010
3. Blumberger et al., THREE-D randomized noninferiority trial, 2018