Theta Burst vs. Standard TMS: 3 Minutes or 37 Minutes — Does It Matter?

Everything you need to know about Theta Burst vs. Standard TMS: 3 Minutes or 37 Minutes — Does It Matter? — how it works, what it costs, and how to find a provider who actually knows what they're doing.

You have been told TMS therapy takes 19-37 minutes per session, five days a week, for six weeks. That is a serious time commitment. Then you hear about theta burst stimulation. In a large trial, the results were similar, but each session takes about 3 minutes.

Related: Accelerated TMS Protocols · The History of TMS: From Faraday to FDA and Beyond · Accelerated TMS in 2026

Naturally, you are skeptical. How can 3 minutes do the same thing as 37?

The answer comes from neuroscience. And the clinical data backs it up convincingly.

What You’ll Learn

• How theta burst stimulation works and why it is different from standard TMS
• What the THREE-D trial found about non-inferiority of outcomes
• The practical advantages of shorter sessions
• Which devices support theta burst protocols
• How to choose between the two protocols

How Standard TMS Works

Conventional repetitive TMS (rTMS) delivers magnetic pulses at a steady rate, typically 10 pulses per second (10 Hz), to the left dorsolateral prefrontal cortex. A standard session delivers 3,000 pulses over about 37 minutes.

Each pulse generates an electrical current in the targeted brain tissue. Over the course of treatment, this repeated stimulation strengthens neural connections in the mood-regulating circuits that are underactive in depression. Think of it as a workout for a specific brain region. Consistent, repetitive, cumulative.

The FDA first cleared this approach in 2008 based on sham-controlled trial data in patients who had not benefited from antidepressants. It is well-studied and the benchmark everything else gets measured against.

How Theta Burst Stimulation Works

Intermittent theta burst stimulation (iTBS) takes a different approach to delivering essentially the same total effect. Instead of steady 10 Hz pulses, iTBS fires bursts of three rapid pulses at 50 Hz, repeated at 5 Hz intervals. That 5 Hz interval is the theta rhythm, which matches natural brain oscillations tied to learning and memory.

In the intermittent pattern, these bursts are delivered for 2 seconds, followed by an 8-second pause, repeated for about 3 minutes. Total pulses: 600.

Six hundred pulses vs. 3,000. How is that equivalent?

It comes down to how the brain responds to patterned stimulation. Basic neuroscience research showed that theta burst patterns could produce lasting changes in cortical excitability with far fewer total pulses than conventional approaches.

The analogy often used is that a rhythmic pattern the brain is tuned to encode may achieve in fewer pulses what steady stimulation needs many more for. The clinical proof, though, comes from trials rather than the analogy.

The THREE-D Trial: The Definitive Comparison

Whether iTBS matches conventional TMS in real people was tested by the THREE-D trial, published in The Lancet in 2018 (Blumberger et al.). It remains the key trial for this comparison.

Here is what they did:

• 414 people with treatment-resistant depression across multiple Canadian sites
• Randomized to either conventional 10 Hz rTMS (about 37 min sessions) or iTBS (about 3 min sessions)
• 5 sessions per week for 4-6 weeks
• Primary outcome: change in Hamilton Depression Rating Scale (HRSD-17) score after treatment

iTBS was statistically non-inferior to conventional rTMS: HRSD-17 scores fell from about 23.5 to 13.4 in both groups. Dropout rates were similar (6% vs 8%), and headache was the most common side effect in both groups. Self-rated pain during treatment was slightly higher with iTBS. In the authors’ words, using iTBS lets clinics treat several times more patients per day without compromising clinical effectiveness.

Advantages of Shorter Sessions

If the outcomes are the same, the practical advantages of shorter sessions are significant.

Time commitment drops dramatically. A 37-minute session, with check-in and setup, means roughly an hour at the clinic. A 3-minute session means 15-20 minutes total, including the walk from the waiting room. Over 30 sessions, that is the difference between 30 hours and 10 hours away from work.

Scheduling gets easier. Clinics can see more people per day with shorter sessions. That often means more appointment slots, shorter waits to start treatment, and easier rescheduling when life gets in the way.

It may be more tolerable. Sitting still for 37 minutes while a coil taps against your head is not anyone’s idea of fun. If you deal with anxiety or restlessness, the shorter sessions are much easier to handle.

Cost may be lower. Not always, but some clinics pass along the efficiency savings. When a TMS provider can treat three people in the time it used to take for one, overhead per person drops.

Device Compatibility

Not every TMS device can deliver theta burst stimulation. Here is what a published review of FDA milestones (timeline of FDA milestones for TMS devices) reports for iTBS clearances:

Other manufacturers’ systems may also support iTBS; confirm with the clinic which protocols its specific device is cleared for.

If you are evaluating clinics, ask specifically whether they offer iTBS and which device they use. You can search TMS providers by location and compare what technologies different clinics use.

Which Should You Choose?

For most people, this comes down to practical considerations, not clinical ones. Here is how to think about it.

Choose theta burst (iTBS) if:

• You have a demanding work schedule and need shorter appointments
• You find the idea of 37-minute sessions daunting
• Your clinic offers it at the same or lower cost
• You tend to get restless or anxious sitting still

Choose standard rTMS if:

• Your clinic does not offer iTBS (it is still more widely available)
• You have tried iTBS and did not respond (some clinicians will switch protocols)
• You prefer a slower, more gradual treatment experience
• Your insurance specifically covers standard rTMS and you are not sure about iTBS coverage

It genuinely does not matter if:

• Both are available and cost is similar. Pick whichever fits your life better. In the THREE-D trial, outcomes were similar.

What About the Stanford Protocol (SAINT)?

You may have heard about the Stanford Neuromodulation Therapy protocol, which uses accelerated iTBS, multiple sessions per day over just 5 days. That is a separate conversation from standard iTBS vs. standard rTMS, but it is worth a quick mention.

The SAINT protocol delivers 10 iTBS sessions per day for 5 consecutive days, 50 sessions total in one week compared to 30 over 6 weeks. An open-label study reported remission in about 90% of 22 participants, and a small sham-controlled trial found larger improvement with active treatment than sham; a later, larger sham-controlled trial found more modest but still significant effects (remission 50% vs 21% at one month). The SAINT Neuromodulation System was FDA-cleared in 2022.

As we covered in our Stanford SNT guide, speed and precision targeting both likely contribute to those results. If speed is your biggest priority, ask your TMS specialist about accelerated protocols.

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 Treatment-Resistant Depression: What Patients Need to Know