Everything you need to know about TMS vs. rTMS: Clarifying the Terminology — how it works, what it costs, and how to find a provider who actually knows what they're doing.
The TMS Patient Buyer's Guide
Everything to know before your first consult — questions to ask, what to expect, and how to compare providers.
If you have spent any time researching TMS, you have encountered a confusing array of terms: rTMS, iTBS, sTMS, TMS, Deep TMS, theta burst, accelerated TMS. Are these different treatments? Are they the same treatment with different names? Are some better than others?
The short answer is that TMS is the umbrella term, and the variations describe different ways of delivering it. Here is a clear guide to what the terms mean.
TMS: The Umbrella Term
TMS (Transcranial Magnetic Stimulation) is the general term for using a magnetic field to stimulate the brain through the scalp. It refers to the technology and the basic principle. When people say “TMS,” they mean the general category of treatments that use this approach.
rTMS: Repetitive TMS
rTMS (repetitive Transcranial Magnetic Stimulation) refers to the delivery of multiple TMS pulses in a train. The original clinical trials used trains of stimulation — for example, 10 Hz pulses delivered for 4 seconds, then off for 26 seconds, repeated for about 37 minutes.
“Repetitive” is now somewhat redundant — all clinical TMS involves repeated pulses. The term rTMS persists from the early research era when “single-pulse TMS” was used for diagnostic purposes and “repetitive TMS” for treatment. You will see rTMS used in research literature to describe standard TMS treatment.
iTBS: Intermittent Theta Burst Stimulation
iTBS (intermittent Theta Burst Stimulation) is a specific patterned protocol that delivers stimulation in short bursts rather than continuous trains. Instead of 10 Hz continuous pulses, iTBS delivers bursts of 3 pulses at 50 Hz, repeated at 5 Hz (the theta rhythm), with intermittent rest periods.
The practical result is much shorter treatment sessions (about 3 minutes vs. about 37 minutes). A large randomized trial found iTBS non-inferior to standard 10 Hz rTMS for depression (Blumberger et al., The Lancet, 2018), and iTBS protocols have FDA clearance on certain devices.
sTMS: Synchronized TMS
sTMS (single-pulse TMS) refers to devices that deliver single pulses rather than trains. The best-known example is eNeura’s handheld SpringTMS, which is FDA-cleared for the acute and prophylactic treatment of migraine (including in adolescents age 12 and older). It is a different device and use from the repetitive TMS used for depression.
Deep TMS (dTMS)
Deep TMS uses specialized H-coil technology (BrainsWay) that penetrates more deeply than standard figure-8 coils. The term “deep” is relative — it describes a design that stimulates deeper and broader regions of the cortex than standard coils.
BrainsWay’s Deep TMS system is FDA-cleared for major depression (2013), OCD (2018), smoking cessation (2020), and anxious depression (2021). It is not FDA-cleared for PTSD. The trade-off for deeper penetration is less focality — a larger brain volume is stimulated.
Accelerated TMS
Accelerated TMS is not a different technology but a different protocol — delivering more than one TMS session per day. Standard TMS delivers one session per weekday over about 6 weeks. Accelerated protocols deliver multiple sessions per day over a compressed period (from about 5 days to a couple of weeks). The Stanford Neuromodulation Therapy (SNT/SAINT) protocol, FDA-cleared in 2022, uses 10 sessions a day for 5 days.
Accelerated TMS uses the same equipment as standard TMS (or theta burst TMS for time efficiency). The Stanford protocol has the most published evidence among accelerated approaches.
Theta Burst TMS
Theta Burst TMS and iTBS are often used interchangeably, but there are two forms:
- iTBS (intermittent theta burst): The excitatory protocol used for depression and other conditions
- cTBS (continuous theta burst): The inhibitory protocol used in research applications
In clinical practice, “theta burst TMS” almost always refers to iTBS.
The Terminology in Practice
When you are researching or discussing treatment, here is how to use the terms:
- “I am looking into TMS for depression” — correct umbrella term
- “My clinic uses theta burst protocols” — describing the specific pattern used, which shortens session time significantly
- “I am considering deep TMS for OCD” — correct application of the specific technology
- “They recommended accelerated TMS” — describing a scheduling approach that compresses the treatment course
Why the Terminology Matters
The different terms describe real differences in treatment — in protocol, session duration, target, and evidence base. Using the right terms helps you:
- Research your specific treatment accurately
- Compare outcomes across studies (which may use different protocols)
- Understand what your clinic is offering
- Make informed decisions about treatment options
When discussing with your clinician, it is perfectly appropriate to ask which specific protocol they use and why. A good clinician will be able to explain the difference between theta burst and standard rTMS, and the rationale for their choice.
The Key Distinction: Protocol vs. Technology
The confusion often arises because two different axes of differentiation are in play:
Technology axis: Standard TMS (figure-8 coil) vs. Deep TMS (H-coil). This is about which brain structures can be reached.
Protocol axis: Standard rTMS vs. theta burst vs. accelerated protocols. This is about how the stimulation is patterned.
Your treatment involves both choices: the technology (what coil) and the protocol (what pattern). Understanding that these are separate decisions clarifies why “TMS” is the umbrella term covering multiple specific implementations.
Related reading
- TMS for Multiple Sclerosis: Addressing Fatigue, Depression, and Cognitive Impairment
- What TMS Actually Feels Like: A Session-by-Session Guide
- How to Prepare for Your First TMS Session
- Preparing for Your First TMS Session: A Practical Walkthrough
- TMS for anxiety
- TMS for Treatment-Resistant Depression: What Patients Need to Know
