Thermoplastic Immobilization Mask Family — what the literature says.

Five real anchor citations across the primary workflows the thermoplastic mask family is bought for — daily H&N 6D setup, CBCT-verified positioning across immobilisation classes, the AAPM TG-176 dosimetric framework, SRS intrafractional 6D motion under mask fixation, and hybrid MR-linac immobilisation. Covers SKUs RT-001 (S-Frame H&N), RT-002 (full-face cranial / SRS) and RT-003 (body shell).

≤ 2.24 mm6D translational setup error under H&N TP mask (You 2024)

99.4 %CBCT alignment within 2 mm — best-in-class TP-mask system (Mail 2024)

0.53 mmintrafractional drift plateau at 10 min under SRS mask (Mangesius 2019)

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H&N 6D setup accuracy under TP mask — You 2024

0.32 mm

X-axis mean (SD ± 1.22)

−1.09 mm

Y-axis mean (SD ± 1.63)

2.24 mm

Z-axis mean (SD ± 1.72)

Rotational errors below 0.4° on every axis (Yaw −0.12° · Pitch 0.22° · Roll 0.35°). Contact-force distribution across the mask (forehead 3.97 N · cheekbones ~4.5 N · chin 8.8 N) quantifies the 3D stress-test framework for pre-treatment mask acceptance.

Daily H&N setup2024

≤ 2.24 mmMean 6D translational setup error under thermoplastic H&N mask across 30 patients / 40 masks / 920 daily MVCT images — well inside the CTV-to-PTV 3-5 mm margin used in standard H&N IMRT

Quantifying thermoplastic mask quality for precision radiotherapy in head and neck cancer — a 3D stress test and 6D-axis error analysis

Medicine (Baltimore) 103(44):e40365 — You, Chen, Chu, Yau, Liu, Lai, Chen, Chen, Tsai, Hsieh

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Setup accuracy within 2 mm — 3-arm comparison

90 / 90 / 92.7 %

Conventional (n = 39, 125 CBCTs)

baseline TP mask, standard headrest

99.4 / 100 / 98.7 %

Custom + mouth-bite (n = 19, 158 CBCTs)

sub-2 mm alignment across AP / SI / RL

CBCT comparison2024

99.4 % / 100 % / 98.7 %Alignment within 2 mm on AP / SI / RL axes for the best-in-class custom-headrest + mouth-bite thermoplastic-mask system — measured on 158 CBCT scans across 19 patients

Evaluation of positioning accuracy in head-and-neck cancer treatment — a cone-beam CT assessment of three immobilization devices with VMAT

Journal of Biological Methods 11(3):e99010025 — Mail, Alshamrani, Lodhi, Khawandanh, Saleem, Khan, Alghamdi, Nadershah, Althaqafy, Subahi, Alghamdi

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AAPM TG-176 — scope for immobilization devices

↓

target-dose loss from device attenuation

↑

skin-dose increase from build-up loss

TPS

device inclusion in the dose calculation

Peer-reviewed framework endorsed by AAPM for indexing devices between the beam and the patient. The reference the mask family's attenuation performance is measured against for planning-system commissioning.

Dosimetric framework2014

TG-176The AAPM Task Group report that establishes the modern framework for accounting for the dosimetric impact of immobilisation devices — attenuation, skin-dose build-up loss and shifted dose distribution — inside the treatment-planning system

Dosimetric effects caused by couch tops and immobilization devices — Report of AAPM Task Group 176

Medical Physics 41(6):061501 — Olch, Gerig, Li, Mihaylov, Morgan (AAPM Radiation Therapy Committee)

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SRS intrafractional drift under TP mask — Mangesius 2019

0.21 mm ± 0.26

0 - 2 min under mask

setup-verification window

0.53 mm ± 0.31

≥ 10 min under mask

plateau — motion levels off at 8-10 min

SRS intrafraction2019

0.21 → 0.53 mmMean 3D head displacement grows from 0.21 mm (0-2 min under mask) to 0.53 mm (10 min) — 453 ExacTrac measurements across 96 SRS fractions. Bounds the intra-fraction margin decision and the SRS beam-on ceiling per fraction

Intrafractional 6D head movement increases with time of mask fixation during stereotactic intracranial RT-sessions

Radiation Oncology 14:231 — Mangesius, Seppi, Weigel, Arnold, Vasiljevic, Goebel, Lukas, Ganswindt, Nevinny-Stickel

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MR-linac TP-mask workflow — Cuccia 2021 review

H&N

gold-standard immobilisation modality

MRI-safe

no ferromagnetic hardware

< 1 mm

systematic translational error

Establishes MRI-compatible thermoplastic-mask + head-STEP-style indexed positioning as the standard-of-care immobilisation approach for brain and head-and-neck patients on 0.35 T + 1.5 T MR-linac systems.

MR-linac hybrid2021

Gold standardEuropean multi-centre review that anchors thermoplastic masks as the gold standard for brain and H&N immobilisation on MR-linac systems — mask + MR receive-coil + hearing protection coexisting inside the bore is the workflow the family plugs into

Patient positioning and immobilization procedures for hybrid MR-Linac systems

Radiation Oncology 16:183 — Cuccia, Alongi, Belka, Boldrini, Hörner-Rieber, McNair, Rigo, Schoenmakers, Niyazi, Slagter, Votta, Corradini

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Back to Thermoplastic Mask Family product page

White Papers & Background Reading

FILE

AAPM TG-176 — Dosimetric effects of couch tops and immobilization devices

Task Group 176 report — the framework covering attenuation, skin-dose build-up loss and shifted-dose-distribution effects of immobilisation devices in the treatment-planning system.

Reference · AAPMDownload

FILE

AAPM TG-42 — Stereotactic radiosurgery

Task Group 42 report — sets the < 2 mm overall targeting-error target for intracranial SRS that the frameless thermoplastic-mask systems above are engineered against.

Reference · AAPMDownload

FILE

ICRU Report 91 — Prescribing, recording, and reporting of stereotactic treatments with small photon beams

ICRU framework governing SRS / SRT stereotactic delivery — small-field dosimetry, GTV / CTV / PTV concepts, and geometric-accuracy requirements the mask family plugs into.

Reference · ICRUDownload

FILE

CDSCO Medical Devices Rules 2017 (India)

Central Drugs Standard Control Organisation regulatory framework for medical-device import + registration in India. The route Class A passive-accessory immobilisation devices (thermoplastic masks, body shells) go through — AERB does not licence non-radioactive positioning accessories; the AERB licence sits on the linac facility itself.

Reference · CDSCODownload

Thermoplastic Mask Family

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Six mask workflows and the daily-imaging cadence each one runs on

H&N IMRT, intracranial SRS, MR-Linac, paediatric brain SRT, trunk IGRT and 3-point re-irradiation — one mask family, six setup-accuracy workflows. Daily CBCT / MVCT verification cadence, intrafractional drift budget and PTV-margin implications.

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Literature Radar · auto-updated daily

Latest thermoplastic-mask research

Fresh peer-reviewed papers on thermoplastic-mask immobilisation for radiotherapy — setup reproducibility, intrafractional motion, SRS + MR-linac workflows, mask-quality metrics. Auto-updated from Europe PMC.

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