How should single-pass and multiple-pass claims in HIFU be evaluated?

A multilayer or three-pass HIFU label does not by itself mean a more effective treatment. The transducer depth, line direction, energy, overlap, anatomical target and contribution to total dose of each pass should be explained; a research protocol cannot simply be copied to another device.

This translation has no recorded clinical or medical-language review.

Direct answer

Pass count is not the same as correctly targeting distinct anatomical layers.
Overlapping lines can create unplanned local energy accumulation and unintended tissue effects.
More energy or treatment time does not show a linear improvement in outcome.

Define what a pass means

A pass may mean repeating the same transducer, adding a second depth or merely changing line direction. The number therefore needs transducer, depth, energy, line spacing and total lines. A marketing label is not an anatomical rationale. Unrecognized overlap can create greater local energy density than the total count shown on a console suggests.

Why evidence does not transfer automatically

Studies comparing single and dual depths used a particular visualized system, selected participants and defined energy constraints. Systematic reviews show substantial protocol variation. Those papers do not validate another focus geometry, cartridge, software or a 4D/7D marketing system. An average study response cannot identify the optimal number of passes for one person.

Records and stop criteria

Record transducer, depth, energy, lines and pass direction by area. Do not continue merely to finish a plan when there is unexpected sharp pain, lost contact, a visualization problem, muscle twitch or a marked surface change. Predetermined total dose and anatomical boundaries should not change to meet a sales target during the session. Neither one nor multiple passes is inherently superior without examination.

Scope of this article

This content is not diagnosis, prescribing, personal risk assessment or a treatment plan. Sources may be limited to a particular product, device, task, indication or study group.

Sources and evidence limits

These links are editorial starting points used to examine the article's boundaries.

A Systematic Review of the Efficacy of Microfocused Ultrasound for Facial Skin Tightening
Contini M, Hollander MHJ, Vissink A, Schepers RH, Jansma J, Schortinghuis J · 2023
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review
A Systematic Review and Meta-Analysis of the Clinical Efficacy and Patients' Satisfaction of Micro-Focused Ultrasound Treatment for Facial Rejuvenation and Tightening
Ling J, Zhao H · 2023
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review
Update on Absorbable Facial Thread Lifts
Riopelle AM, Geisler AN, Eber A, Dover JS · 2025
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review
A Meta-Analysis and Systematic Review of the Incidences of Complications Following Facial Thread-Lifting
Niu Z et al. · 2021
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review
Clinical Efficacy and Safety of Focused-Image Ultrasonography: A 2-Year Experience
Prospective study authors · 2012
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review
Microfocused Ultrasound With Visualization: A Systematic Review of Adverse Events and Risk of Subsequent Facelift Compromise
Systematic review authors; Aesthetic Surgery Journal · 2025
Scope and limitations: Interpret this source only within the exact product, device, method, indication and study population it names. It does not establish personal suitability, Turkish authorization, a universal protocol or a guaranteed outcome; consult the full source and current local information.
Editorial source — not a signed clinical review