arxiv: 2604.21747 · v1 · submitted 2026-04-23 · ⚛️ physics.med-ph · physics.ins-det· physics.optics

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OptoCENTAL: a standardised, bench-testing platform based on phantoms for validating optical systems aimed at clinical monitoring of the placenta

Luca Giannoni , Uzair Hakim , Fr\'ederic Lange , Musa Talati , Darshana Gopal , Angelos Artemiou , Niccole Ranaei-Zamani , Subhabrata Mitra

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Ilias Tachtsidis

Authors on Pith no claims yet

Pith reviewed 2026-05-08 12:57 UTC · model grok-4.3

classification ⚛️ physics.med-ph physics.ins-detphysics.optics

keywords optical phantomsplacenta monitoringnear-infrared spectroscopydiffuse optical tomographybench-testingstandardizationclinical translationNIRS

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The pith

OptoCENTAL introduces a standardized platform of digital, solid and liquid phantoms for validating optical systems used in clinical placenta monitoring.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents OptoCENTAL, a new platform that uses a combination of digital, solid, and liquid optical phantoms to standardize the bench-testing and validation of photonics-based systems for monitoring the human placenta. This matters because compact optical tools like near-infrared spectroscopy and diffuse optical tomography could soon allow continuous, bedside assessment of pregnancy status in real time, potentially helping predict delivery outcomes. By demonstrating the platform on wearable continuous-wave devices as well as broadband and time-domain systems, the work shows how any such solution can be characterized for basic performance, monitoring accuracy, and depth sensitivity. The effort aims to speed the move of these technologies from research into hospitals and toward certification and commercial use.

Core claim

OptoCENTAL is a standardised platform based on multiple optical phantoms, ranging from digital through solid to liquid, for the comprehensive bench-testing, characterisation and validation of any photonics solution and instrumentation aimed at in vivo clinical monitoring of the human placenta. Exemplary applications show its flexibility across different optical systems and its ability to deliver quantitative assessments of instrument performance, monitoring accuracy and depth sensitivity.

What carries the argument

The OptoCENTAL platform, which relies on digital, solid and liquid phantoms to simulate the optical properties of the placenta and surrounding maternal tissues.

If this is right

Any optical system for placenta monitoring can be tested and compared using the same phantom procedures regardless of whether it is a wearable continuous-wave device or a broadband time-domain setup.
Quantitative measures become available for instrument performance, accuracy of monitoring, and depth sensitivity.
Standardization supports the translation of these optical methods into clinical practice for real-time pregnancy monitoring.
Pathways open toward certification and commercialisation of the validated technologies.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Adoption of OptoCENTAL could create common benchmarks that allow direct comparison of results from different research groups working on placental optics.
The phantom-based approach might be extended to validate systems for monitoring other layered tissues in the body.
By providing a shared testing framework, the platform may reduce duplication in validation efforts across the field.

Load-bearing premise

The chosen digital, solid and liquid phantoms accurately reproduce the optical properties, layering and heterogeneity of the in vivo human placenta and maternal tissues.

What would settle it

Clinical measurements on actual pregnant patients using a tested optical system would deviate substantially from the accuracy and sensitivity values obtained on the OptoCENTAL phantoms.

read the original abstract

Optical imaging and spectroscopy solutions, such as near-infrared spectroscopy (NIRS) and diffuse optical tomography (DOT), have the potential to provide compact, bedside monitoring of the placenta in the clinic, thanks to recent advancements in miniaturisation and wireless wearability. This would provide neonatologist with continuous assessment of the pregnancy status in real-time, as well as tools to possibly predict delivery outcomes. We present here OptoCENTAL, a standardized platform based on multiple optical phantoms, from digital, through solid to liquid, for a comprehensive bench-testing, characterisation and validation of any photonics solution and instrumentation that aims at in vivo, clinical monitoring of the human placenta. Results: Exemplary applications of the OptoCENTAL platform on different types of optical systems, from wearable, continuous-wave devices to broadband and time-domain NIRS systems, demonstrate the flexibility of its procedures to be implemented with any setup, allowing users to compare performances across different solutions. The results also show the capability of OptoCENTAL to provide quantitative assessment of the major features required by any photonic solution for providing effective and efficient monitoring of the placenta, including basic instrument performances, quantification of monitoring accuracy, as well as depth sensitivity. OptoCENTAL represent the first-of-a-kind effort in standardising bench-testing and validation of optical imaging and spectroscopy methods in the framework of placental clinical applications, further advancing the translation of such modalities into the hospitals, as well as towards future certification and commercialisation of such technologies.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

OptoCENTAL gives a practical standardized phantom platform for testing placenta optical monitors, but its value depends on how closely the phantoms match real tissue properties.

read the letter

OptoCENTAL is a standardized bench-testing platform that uses digital, solid, and liquid phantoms to validate optical systems for clinical placenta monitoring. The paper shows how to apply it across wearable continuous-wave devices, broadband NIRS, and time-domain systems, with procedures for checking basic performance, monitoring accuracy, and depth sensitivity. This setup lets users run the same tests on different instruments and compare results directly, which is a useful step for anyone trying to move these tools toward the clinic or certification. The flexibility across instrument types stands out as the clearest practical contribution. The main soft spot is phantom fidelity. The platform's claims about quantitative assessment rest on the assumption that the chosen phantoms reproduce the absorption, scattering, layering, and heterogeneity of the placenta plus maternal tissues at NIRS wavelengths. The abstract gives no explicit comparison to measured in vivo or ex vivo placental values, so any accuracy or sensitivity numbers inherit that uncertainty. If the full paper includes those direct checks and shows the phantoms fall inside physiological ranges, the concern shrinks; otherwise the validation metrics stay hard to translate to bedside performance. This is a methods paper aimed at biomedical optics researchers and perinatal engineers who are building or testing placenta monitors. Someone developing a new device would find the procedures and cross-system examples worth reading. It deserves peer review because the standardization gap is real and the platform concept is workable, even if the phantom validation section needs more evidence to carry the central claims.

Referee Report

1 major / 2 minor

Summary. The manuscript introduces OptoCENTAL, a standardized bench-testing platform that employs digital, solid, and liquid optical phantoms to validate and characterize optical imaging and spectroscopy systems (including CW, broadband, and time-domain NIRS) for clinical placental monitoring. It presents exemplary applications demonstrating the platform's flexibility across instrument types and claims that it enables quantitative assessment of basic instrument performance, monitoring accuracy, and depth sensitivity, positioning the work as the first standardized effort of its kind to support clinical translation and future certification.

Significance. If the phantoms accurately reproduce the layered optical properties and heterogeneity of the in vivo placenta and maternal tissues, the platform could provide a valuable standardized framework for comparing and validating emerging bedside optical monitoring technologies. The multi-type phantom approach (digital through liquid) is a clear strength, offering flexibility that could accelerate translation by allowing consistent testing protocols across different hardware solutions.

major comments (1)

[Phantom design and characterization section] Phantom design and characterization section: The manuscript provides no explicit comparison (e.g., table or text) of the selected absorption (μ_a) and reduced scattering (μ_s') values for the digital, solid, and liquid phantoms against published in vivo or ex vivo human placental and maternal tissue measurements at NIRS wavelengths (700–900 nm). This mapping is load-bearing for the central claims of quantitative assessment of monitoring accuracy and depth sensitivity in the exemplary results, as unvalidated phantom properties would limit the predictive value for bedside performance.

minor comments (2)

[Abstract] Abstract: The results paragraph refers to 'quantitative assessment' and 'exemplary applications' but supplies no numerical metrics, error bars, or specific performance values; adding one or two representative numbers would strengthen the summary without lengthening the abstract.
[Abstract and Conclusion] The 'first-of-a-kind' claim in the abstract and conclusion would benefit from a brief sentence contrasting OptoCENTAL with existing phantom platforms used in cerebral or breast NIRS validation to clarify the novelty in the placental context.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their positive assessment of the OptoCENTAL platform and for the constructive major comment, which has helped us strengthen the manuscript. We have revised the paper to directly address the concern about explicit validation of phantom optical properties.

read point-by-point responses

Referee: [Phantom design and characterization section] Phantom design and characterization section: The manuscript provides no explicit comparison (e.g., table or text) of the selected absorption (μ_a) and reduced scattering (μ_s') values for the digital, solid, and liquid phantoms against published in vivo or ex vivo human placental and maternal tissue measurements at NIRS wavelengths (700–900 nm). This mapping is load-bearing for the central claims of quantitative assessment of monitoring accuracy and depth sensitivity in the exemplary results, as unvalidated phantom properties would limit the predictive value for bedside performance.

Authors: We agree that an explicit, quantitative mapping of the phantom properties to published tissue data is essential to support the claims of quantitative assessment and clinical relevance. The original manuscript described the rationale for the chosen μ_a and μ_s' values (selected to fall within reported ranges for placental and maternal tissues) but did not include a direct side-by-side comparison. In the revised version we have added a new Table 1 in the Phantom design and characterization section. This table lists the exact μ_a and μ_s' values implemented for the digital, solid, and liquid phantoms at representative NIRS wavelengths (700, 800, and 900 nm) together with the corresponding literature values drawn from ex vivo and in vivo human placental and maternal tissue studies. We have also inserted a short accompanying paragraph that discusses the degree of agreement (noting that our selections lie within the inter-study variability reported in the literature) and explains any minor deviations. These additions directly substantiate the quantitative claims regarding monitoring accuracy and depth sensitivity without altering the original phantom designs or results. revision: yes

Circularity Check

0 steps flagged

No circularity: methods platform description with no derivation chain or fitted predictions

full rationale

The paper presents OptoCENTAL as a standardized bench-testing platform using digital, solid and liquid phantoms for validating optical systems aimed at placental monitoring. No equations, derivations, parameter fits, or predictions are described that could reduce to inputs by construction. The central contribution is the platform itself and its exemplary use on CW, broadband and TD systems; claims of standardization and first-of-a-kind status rest on the described procedures rather than any self-referential logic or self-citation load-bearing step. Phantom optical properties are chosen as inputs to the platform, not derived from it. This matches the reader's assessment of low circularity burden for a methods paper.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The platform rests on the assumption that the selected phantoms faithfully represent placental optical properties; no free parameters or invented entities are introduced in the abstract.

axioms (1)

domain assumption Optical phantoms can be fabricated to match the absorption and scattering properties of placental and maternal tissue at near-infrared wavelengths.
Invoked when stating that the platform enables quantitative assessment of monitoring accuracy and depth sensitivity.

pith-pipeline@v0.9.0 · 5623 in / 1139 out tokens · 37009 ms · 2026-05-08T12:57:01.711774+00:00 · methodology

discussion (0)

Reference graph

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