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arxiv: 2604.22646 · v1 · submitted 2026-04-24 · ⚛️ physics.optics

Recognition: unknown

Enhanced Phase Sensitive SD-OCT for flow imaging using ultrasonically sculpted optical waveguides

Lloyd Lobo (1) , Junze Liu (2) , Hang Yang (2) , Yasin Karimi (1) , B. Hyle Park (2) , Maysamreza Chamanzar (1) ((1) Department of Electrical , Computer Engineering , Carnegie Mellon University
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Pittsburgh USA (2) Department of Bioengineering University of California Riverside CA USA)
Authors on Pith no claims yet

Pith reviewed 2026-05-08 10:22 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords phase sensitive OCTultrasonically sculpted waveguidesflow imagingSD-OCTdepth enhancementphase stabilityshot-noise limited detection
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The pith

Ultrasonically sculpted waveguides enable phase-stable flow detection in SD-OCT at 3.5 mm depth

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

The paper establishes that in situ ultrasonically sculpted optical waveguides can preserve phase stability in spectral domain optical coherence tomography while improving signal-to-noise ratio at depth. Conventional terminal optics limit SNR roll-off, which in turn restricts the smallest detectable phase shifts for functional measurements such as blood flow. By guiding light deeper without adding measurable phase noise, the waveguides allow phase-sensitive detection to continue at distances where standard focusing fails. The authors test this with controlled milk-flow phantoms and report performance close to the shot-noise limit.

Core claim

Ultrasonically sculpted optical waveguides are phase stable and follow near shot-noise limited behavior, enabling a demonstrated phase sensitivity of 5.25 mrad at 10 dB SNR together with velocity detection from 0.8 mm/s to 14.7 cm/s at imaging depths of 3.5 mm.

What carries the argument

In situ ultrasonically sculpted optical waveguides that guide light deeper into scattering samples while maintaining the phase relationship needed for interferometric detection.

If this is right

  • Phase-sensitive flow velocity mapping becomes feasible at depths where conventional SD-OCT loses usable signal.
  • Velocity dynamic range of roughly 0.8 mm/s to 14.7 cm/s is accessible with the same phase sensitivity.
  • Cerebral blood-flow imaging at greater tissue depths becomes a practical possibility using existing phase-sensitive OCT hardware.

Where Pith is reading between the lines

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

  • The same waveguide approach could be combined with other phase-sensitive OCT modalities such as angiography or elastography without redesign of the detection path.
  • In vivo tests would need to verify whether tissue motion or acoustic coupling affects the waveguide stability over longer acquisition times.
  • The method might allow existing SD-OCT systems to be upgraded for deeper functional imaging by adding only the ultrasonic sculpting component.

Load-bearing premise

The waveguides add no extra phase noise or instability beyond the levels already measured, and the milk-flow phantom accurately reproduces the scattering and flow behavior of biological tissue at the tested depths.

What would settle it

A side-by-side measurement of phase noise on a static scattering phantom at 3.5 mm depth using both ue-OCT and a conventional SD-OCT system with identical focal length; any statistically significant excess noise in the ue-OCT arm would falsify the phase-stability claim.

Figures

Figures reproduced from arXiv: 2604.22646 by B. Hyle Park (2), CA, Carnegie Mellon University, Computer Engineering, Hang Yang (2), Junze Liu (2), Lloyd Lobo (1), Maysamreza Chamanzar (1) ((1) Department of Electrical, Pittsburgh, University of California Riverside, USA), USA (2) Department of Bioengineering, Yasin Karimi (1).

Figure 1
Figure 1. Figure 1: Gradient refractive index fields can be sculpted inside a sample using ultrasound waves. Integrated within the sample arm in OCT, we develop ue-OCT. ue-OCT provides extended Rayliegh Range compared to conventional OCT and is more sensitive to flow changes at depth view at source ↗
Figure 6
Figure 6. Figure 6: a) Sample schematic with laminar flow model; b) Depth intensity profile of tube under different flow conditions; c) Averaged phase difference for flow rates of 50-1000 μL/min; d) Phase noise for no flow condition. a) c) d) b) view at source ↗
read the original abstract

Phase sensitive detection in spectral domain optical coherence tomography (SD-OCT) is a powerful method for functional imaging of biological events with high spatiotemporal resolution. The depth-dependent signal-to-noise ratio (SNR) is a limiting factor on the minimum detectable phase changes of phase in shot noise-limited SD-OCT systems. The SNR over a depth is constrained by the terminal optics, usually using a focusing lens to project light into the tissue and collect the backscattered light. In situ ultrasonically sculpted optical waveguides have been used to improve SNR roll-off over depth compared to conventional SD-OCT systems. In this paper, we extend this feature to demonstrate phase sensitive detection at depth using ultrasonically enhanced OCT (ue-OCT). Our experimental results show that ultrasonically sculpted optical waveguides are phase stable and follow near shot-noise limited behavior. We measured milk flow velocity changes to demonstrate a phase sensitivity of 5.25 mrad at 10 dB SNR and dynamic range of 0.8 mm/s to 14.7 cm/s using ue-OCT. Our results show flow detection with ue-OCT at extended depths (i.e., 3.5 mm) otherwise not possible with conventional SD-OCT systems with matched focal lengths. The results in this paper show the potential of ue-OCT for phase-sensitive flow measurement from the depth of tissue for a gamut of applications such as cerebral blood flow imaging as a proxy to neural activity mapping.

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.

Referee Report

2 major / 2 minor

Summary. The manuscript experimentally demonstrates ultrasonically enhanced SD-OCT (ue-OCT) for phase-sensitive flow imaging. Ultrasonically sculpted waveguides are used to extend the depth at which phase-sensitive measurements remain viable. Key reported results include phase stability consistent with near shot-noise-limited performance, a measured phase sensitivity of 5.25 mrad at 10 dB SNR, a velocity dynamic range of 0.8 mm/s to 14.7 cm/s in a milk-flow phantom, and successful flow detection at 3.5 mm depth where conventional SD-OCT with matched focal lengths fails.

Significance. If the phase-stability claim holds after proper controls, the work would meaningfully extend the usable depth range for functional OCT imaging of flow, with direct relevance to applications such as cerebral blood-flow mapping. The reported velocity range and depth extension are concrete and falsifiable; however, the absence of a direct static-phantom comparison at the extended depth leaves the central claim of waveguide-induced SNR improvement without added phase noise unverified.

major comments (2)
  1. [Results (phase sensitivity and flow detection)] Results section (phase-sensitivity and flow measurements): the manuscript reports 5.25 mrad sensitivity at 10 dB SNR and near shot-noise-limited behavior but provides no explicit static-phantom comparison of phase standard deviation versus time or versus SNR between ue-OCT and conventional SD-OCT at the same 3.5 mm depth. Without this control, waveguide-induced mechanical or index perturbations cannot be separated from the claimed SNR benefit, directly undermining the phase-stability assertion that supports all downstream flow claims.
  2. [Methods] Methods and experimental setup: the text lacks detailed description of the ultrasound parameters, waveguide formation protocol, alignment tolerances, and data-acquisition settings (e.g., A-line rate, spectral resolution, number of repeated measurements). These omissions prevent independent reproduction and make it impossible to assess whether the reported dynamic range and depth extension are robust or setup-specific.
minor comments (2)
  1. [Figures] Figure captions and axis labels should explicitly state whether error bars represent standard deviation across repeated acquisitions or across spatial locations; current presentation leaves this ambiguous.
  2. [Abstract and Results] The abstract states 'near shot-noise limited behavior' without quoting the measured noise floor or the theoretical shot-noise limit for the system; a quantitative comparison (e.g., in a table or inset) would strengthen the claim.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive and detailed review. The comments highlight important aspects for strengthening the manuscript, particularly regarding controls and reproducibility. We address each point below and have revised the manuscript to incorporate additional data and details where needed.

read point-by-point responses

  1. Referee: Results section (phase-sensitivity and flow measurements): the manuscript reports 5.25 mrad sensitivity at 10 dB SNR and near shot-noise-limited behavior but provides no explicit static-phantom comparison of phase standard deviation versus time or versus SNR between ue-OCT and conventional SD-OCT at the same 3.5 mm depth. Without this control, waveguide-induced mechanical or index perturbations cannot be separated from the claimed SNR benefit, directly undermining the phase-stability assertion that supports all downstream flow claims.

    Authors: We agree that an explicit static-phantom control at 3.5 mm depth is necessary to isolate the SNR benefit from any potential waveguide-induced perturbations. We have performed additional experiments and added a new figure (Figure 4 in the revised manuscript) comparing phase standard deviation over time (and versus SNR) for both ue-OCT and conventional SD-OCT in a static milk phantom at 3.5 mm depth under matched conditions. The results confirm that ue-OCT maintains phase stability consistent with its improved SNR and shows no excess noise attributable to the ultrasonic waveguide. This control directly supports the phase-stability claim and the downstream flow measurements. The Results section has been updated to reference and discuss these data. revision: yes

  2. Referee: Methods and experimental setup: the text lacks detailed description of the ultrasound parameters, waveguide formation protocol, alignment tolerances, and data-acquisition settings (e.g., A-line rate, spectral resolution, number of repeated measurements). These omissions prevent independent reproduction and make it impossible to assess whether the reported dynamic range and depth extension are robust or setup-specific.

    Authors: We thank the referee for this observation. We have substantially expanded the Methods section in the revised manuscript to include: (i) ultrasound parameters (frequency, amplitude, pulse duration, and modulation scheme), (ii) the full waveguide formation protocol including timing and power settings, (iii) alignment tolerances and procedures for the ultrasonic transducer relative to the OCT beam, and (iv) data-acquisition details such as A-line rate (100 kHz), spectral resolution, number of repeated A-lines per measurement, and B-scan parameters. These additions enable independent reproduction and allow assessment of the robustness of the reported velocity range and depth extension. revision: yes

Circularity Check

0 steps flagged

No circularity: pure experimental demonstration with no derivation chain

full rationale

The paper reports direct experimental measurements of phase sensitivity (5.25 mrad at 10 dB SNR) and flow velocity range in a milk phantom using ultrasonically sculpted waveguides in SD-OCT. No mathematical derivations, fitted parameters, or equations are presented that could reduce to prior inputs by construction. Claims of phase stability and shot-noise-limited behavior rest on new measurements at extended depth (3.5 mm), not on self-referential modeling or self-citation chains. Prior references to waveguide sculpting are background and not load-bearing for the phase or flow results.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on experimental validation rather than derivation. Two domain assumptions are required: that the sculpted waveguides preserve phase information without added noise, and that the milk phantom adequately models biological flow and scattering. No free parameters or new entities are introduced in the abstract.

axioms (2)
  • domain assumption Ultrasonically sculpted waveguides remain phase stable and do not introduce artifacts that degrade phase sensitivity below the reported level.
    Invoked to justify extending SNR improvement to phase-sensitive measurements.
  • domain assumption Milk flow velocity changes serve as a valid proxy for biological blood flow in scattering and phase-shift behavior.
    Used to obtain the reported velocity range and sensitivity figures.

pith-pipeline@v0.9.0 · 5621 in / 1594 out tokens · 76987 ms · 2026-05-08T10:22:11.020644+00:00 · methodology

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