iTBS vs Standard rTMS: What’s Different and When “Accelerated” Applies
- Sophroneo Psychiatry
- Feb 10
- 5 min read
If you are researching depression treatments in the Atlanta area, you have likely hit a wall of acronyms: rTMS, iTBS, theta burst, and accelerated TMS.
A common confusion we see at Sophroneo Behavioral Health is patients assuming "3-minute TMS" (iTBS) is automatically the same thing as "Accelerated TMS" (a 1-week course). They are actually two different dials your clinician can turn: one controls the speed of the session, and the other controls the intensity of the calendar week.
What is iTBS in plain language?
Intermittent Theta Burst Stimulation (iTBS) is a newer form of TMS that mimics the natural rhythm of brain activity (theta waves). Because it delivers pulses in a very efficient pattern, a full treatment session can be completed in just 3 to 10 minutes, compared to the 20–37 minutes required for older standard protocols.
How is iTBS different from standard rTMS?
The difference is the stimulation pattern, not the basic concept. Both use a magnetic coil to stimulate the dorsolateral prefrontal cortex (DLPFC) to treat depression.
Standard rTMS (10 Hz): Like a steady drumbeat. It delivers a train of pulses, then rests, then repeats. It takes longer to deliver the full "dose" of pulses.
iTBS: Like a rapid drum roll. It delivers bursts of pulses very quickly. Research shows it is just as safe and effective as standard rTMS for Major Depressive Disorder, but much faster per visit.
Does iTBS automatically mean accelerated TMS?
No. This is the #1 myth.
You can do iTBS on a "Standard" Schedule: You come in once a day, 5 days a week, for 6 weeks. Your appointment is just very short (10 mins door-to-door).
You can do iTBS on an "Accelerated" Schedule: You come in for 5 days total, but you do 10 sessions per day.
Think of iTBS as the "technology" that makes the "accelerated schedule" possible. Sitting in a chair for ten 37-minute sessions a day (standard rTMS) would be exhausting (over 6 hours of chair time). Doing ten 3-minute sessions (iTBS) is manageable.
Which “accelerated” meanings should you separate when comparing clinics?
When a clinic says "We offer fast TMS," they could mean three different things. Use this decoder to avoid comparing apples to oranges.
"Shorter Sessions" (iTBS): * What it is: Daily visits for 6 weeks, but only 3 minutes in the chair.
Best for: People working full-time who need to squeeze treatment into a lunch break.
"Accelerated Schedule" (The Schedule):
What it is: Multiple sessions (usually 5–10) stacked into one day, for 1–2 weeks total.
Best for: People traveling from out of town or needing rapid results.
"Named Protocols" (e.g., SAINT/SNT):
What it is: A specific, rigid research protocol using iTBS, 10 sessions/day for 5 days, often with MRI guidance.
Best for: Specific clinical cases where exact replication of research conditions is desired.
Which people might prefer iTBS-style shorter sessions?
Even if you don't choose an "accelerated" 1-week course, asking for iTBS (the 3-minute session) on a standard 6-week schedule is often a great quality-of-life upgrade.
Parents: Easier to find childcare for 30 minutes than 90 minutes.
Hourly Workers: Less lost wages if you can treat-and-go.
Anxiety Prone: Some patients find sitting still for 30 minutes difficult; 3 minutes is far easier to tolerate.
What side effects are common across iTBS and standard rTMS?
Because iTBS delivers energy faster, you might wonder if it "hurts" more. Generally, the side effect profile is very similar to standard rTMS.
Scalp sensation: iTBS feels more like a "buzzing" or "drilling" sensation, while standard rTMS feels like "tapping."
Headache: Mild tension headaches are common in both but usually fade after the first week.
Safety: Both are FDA-cleared and safe. Seizure risk is extremely low for both when standard safety guidelines are followed.
What questions should you ask to understand the protocol you’re being offered?
Don't be afraid to get technical. Bring this checklist to your consult:
Protocol Questions Checklist:
"Are you using standard rTMS (19-37 mins) or iTBS (3 mins)?"
"If I do the accelerated schedule, how many sessions will I do per day?"
"How much time is required between sessions?" (Crucial for planning your day, usually 50 minutes).
"Do you use a standard '5cm' measurement for targeting, or something else?"
How do you decide between shorter sessions and a truly accelerated course?
Choose "Shorter Sessions" (Standard Schedule iTBS) if:
You want the highest likelihood of insurance coverage (most plans cover standard 6-week courses).
You want to process the emotional changes slowly over weeks.
Choose "Accelerated Course" (Multi-session days) if:
You are driving a long distance (e.g., to our Stone Mountain or Powder Springs locations) and want to minimize trips.
You have a limited window of time off work.
How does this relate to options at Sophroneo?
At Sophroneo Behavioral Health, we believe in fitting the protocol to the patient, not the other way around. During your evaluation, we can discuss whether a standard rTMS course or an accelerated option fits your life best. We also offer NeuroStar TMS, which is the gold standard for treating depression.
Frequently Asked Questions:
Is iTBS FDA-cleared for depression? Yes. The FDA cleared the iTBS protocol (specifically the "Theta Burst" pattern) for the treatment of Major Depressive Disorder in 2018. It is recognized as being just as safe and effective as the older, longer standard TMS protocols.
Does the shorter session mean it works less well? No. Clinical studies, including the2 large-scale "THREE-D" trial, showed that iTBS (the 3-minute protocol) was non-inferior to standard rTMS (the 37-minute protocol). This means patients achieved similar remission and response rates regardless of which session length they used.
Does iTBS cost more than standard TMS? Typically, no. Most insurance plans that cover TMS treat CPT code 90868 (Therapeutic Repetitive Transcranial Magnetic Stimulation treatment) as applicable to both standard and iTBS sessions, provided they are done once per day. However, if you use iTBS as part of a multiple-session-per-day accelerated schedule, insurance coverage becomes more complex.
Can I switch from standard rTMS to iTBS halfway through treatment? Often, yes. If you start with standard 20-minute sessions and find them difficult to fit into your schedule, ask your Sophroneo clinician if switching to iTBS is clinically appropriate for you. The target area (DLPFC) remains the same; only the software pattern changes.
Why doesn't every clinic offer iTBS? iTBS requires specific software and hardware capabilities. Older TMS machines may not be able to deliver the rapid-fire pulses required for Theta Burst stimulation without overheating. Sophroneo uses modern NeuroStar technology capable of these advanced protocols.
Is the seizure risk higher with iTBS? Safety data indicates the risk is comparable to standard TMS (very low, approximately <0.1% across all patients) when standard safety guidelines are followed. Your clinician will screen you for seizure risk factors (like alcohol withdrawal or history of epilepsy) regardless of which protocol is chosen.
Does iTBS feel different? Some patients report that iTBS feels "sharper" or more intense than standard rTMS because the pulses are delivered in rapid bursts rather than a steady train. However, because the session is so short (3 minutes vs. 20+), many patients find it easier to tolerate overall.
Do I need a new "mapping" (motor threshold) session if I switch to iTBS? Generally, yes. Your Motor Threshold (MT); the amount of energy needed to stimulate your neuronscan, vary slightly between different pulse shapes or protocols. Your clinician will usually re-check your threshold before starting the new protocol to ensure accuracy.
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