wpi: sync data card and figures with GitHub

wpi/README.md

@@ -1,5 +1,6 @@
 ---
-pretty_name: "OpenH-RF — eSAF Rotational 3D US Raw Channel Data (Medical FUSION Lab, WPI)"
+name: wpi
+pretty_name: "eSAF Rotational 3D US Raw Channel Data (Medical FUSION Lab, WPI)"
 license: cc-by-4.0
 task_categories:
   - image-to-image
@@ -16,111 +17,50 @@ size_categories:
   - n<1K
 ---
 
-# OpenH-RF Sub-Dataset — Rotational 3D US Raw Channel Data for Elevational SAF (Simulated + Measured Phantom)
+# Rotational 3D Ultrasound Raw Channel Data for Elevational SAF
+
+<p align="center"><img src="assets/esaf_topview_sweep.gif" width="55%" alt="Top-view MIP: the naive reconstruction (magenta) accumulating into a smear arc as the probe sweeps 180 degrees about the rotation axis, against the eSAF label (cyan)"></p>
+
+*Top view down the rotation axis of a point target at 20 mm depth, 6 mm off-axis, [`data/tall_elev_H12__point_z020_r6.hdf5`](https://huggingface.co/datasets/nvidia/OpenH-RF/blob/main/wpi/data/tall_elev_H12__point_z020_r6.hdf5). Magenta is the naive per-angle reconstruction, filling in as the array (white line) sweeps 180° about the rotation axis (small circle); cyan is the paired eSAF label shipped in the file; white is where both agree. eSAF collapses the rotational smear arc back onto the target (arc-FWHM 1.26 → 0.39 mm).*
 
 ## Dataset Description
-Synthetic rotational 3D ultrasound acquisitions of point, pair, and off-axis targets, captured
-with an **elevation-focused 1D linear array** that is rotated 180° about its axial
-axis (1° steps, 180 frames). Each acquisition stores the **raw per-element channel
-RF** for a single normal plane-wave transmit at every rotation angle — i.e. the data
-*before* in-plane beamforming — which is what enables flexible offline beamforming and
-the **elevational Synthetic Aperture Focusing (eSAF)** method. The targets span a wide
-depth range to capture the depth-dependent elevational beam thickness (the artifact
-eSAF corrects). The release is **mostly simulated (Field II)**, complemented by a
-small set of **real measured phantom** rotational scans acquired with the physical
-Japan Probe 68-element array (same geometry as the simulation) over a shallow-to-focal
-depth series (10–45 mm). **Simulated + measured phantom** data (no in-vivo / subjects).
+
+Rotational 3D ultrasound acquisitions of point, pair and off-axis targets, captured with an **elevation-focused 1D linear array rotated 180° about its axial axis** (1° steps). Each acquisition stores the **raw per-element channel RF** of a single normal plane-wave transmit at every rotation angle, i.e. the data before in-plane beamforming, which enables flexible offline beamforming and **elevational Synthetic Aperture Focusing (eSAF)**. Every file also carries the eSAF-reconstructed 3D volume as a paired label.
+
+The release is mostly **simulated (Field II)**: a grid of 10 probe types × 19 targets spanning depths where the elevational beam thickness (the artifact eSAF corrects) varies. It is complemented by 5 **measured phantom** rotational scans with the physical Japan Probe 68-element array (same geometry as the simulation) at 10–45 mm depth. No human or animal subjects.
 
 ## Dataset Contributor(s)
-Medical FUSION Laboratory, Worcester Polytechnic Institute. Contact: Ryo Murakami.
+
+- Ryo Murakami (contact)
+- Medical FUSION Laboratory, Worcester Polytechnic Institute
 
 ## Dataset Creation Date
-06/15/2026.
+
+06/15/2026
 
 ## License / Terms of Use
-CC BY 4.0 (full text in `LICENSE`). The release contains **simulated (Field II) and
-real measured phantom** rotational scans — inanimate phantom only, so there are no
-IP, subject-consent, or IRB constraints.
 
-**Citation.** When using this dataset, please cite:
-> R. Murakami et al., "Elevational Synthetic Aperture Focusing for Rotated
-> Array-Based Three-Dimensional Ultrasound Imaging," IEEE Access, 2025.
+[Creative Commons Attribution 4.0 International (CC BY 4.0)](https://creativecommons.org/licenses/by/4.0/legalcode.en). Retain attribution and identify modifications when reusing the data.
 
 ## Intended Usage
-Advanced beamforming and **elevational resolution recovery** for rotational 3D US
-(eSAF), elevation-PSF / aperture-growth studies, and as a reproducible raw-channel-data
-benchmark for rotational synthetic-aperture reconstruction.
+
+Advanced beamforming and **elevational resolution recovery** for rotational 3D US (eSAF), elevation-PSF / aperture-growth studies, and a reproducible raw-channel-data benchmark for rotational synthetic-aperture reconstruction.
 
 ## Dataset Characterization
-- **Data Collection Method:** synthetic, generated with **Field II** (Jensen) run in
-  **MATLAB**. The main release is a **probe × target grid** produced by
-  `sim/batch_sim_probe_target.m` (source) (with `sim/sim_probe_catalog.m` /
-  `sim/sim_target_catalog.m`, source): for each (probe type, target) it uses `xdc_focused_array`
-  + `calc_scat_multi` to produce the raw per-element channel RF at every rotation angle
-  (scatterer rotated about the axial axis, transducer fixed), then `sim/sim_dataset_to_zea.py`
-  (source) repackages every case into the zea format here. **10 probe types** span lateral aperture
-  (`n_el` 32/68/128, pitch 0.1/0.2/0.3 mm), elevation height `H` (4/8/12 mm), and elevation
-  focal depth `R` (25/45/90 mm + unfocused) — see the probe table in `data/manifest.json`.
-  (The earlier 18-acquisition set generated by `sim/batch_generate_fieldii.m` +
-  `sim/mat_to_zea.py` (source) remains available as a compatible alternative with the
-  identical schema.)
-  **Measured phantom acquisitions (5):** real rotational scans of the physical Japan
-  Probe 68-element array on a wire/point phantom, acquired with CPWC channel-RF capture
-  (`experiment/Ryo_SetUp_JP68_PWCompound_3D_ChannelRF.m`, source) and a Galil-controlled 180°
-  rotation. Each scan is time-tag-synced (frames → motor angles) and reduced to the
-  **single centre (normal) plane wave per angle** by `experiment/sync_channel_rf.m` (source)
-  (so the schema matches the simulation, n_tx = 1), then converted with the same
-  `sim/sim_dataset_to_zea.py` (source). They span a shallow-to-focal depth series (10, 20, 30,
-  40, 45 mm nominal target depth).
-- **Labeling Method:** synthetic ground truth (exact target positions known; in
-  `data/manifest.json`).
-- **Acquisition system (simulated):** Japan Probe JP_Linear_68 — 68-element linear
-  array, pitch 0.2 mm, element width 0.15 mm, element height 8 mm, **elevational lens
-  focus 45 mm** (Field II `xdc_focused_array` with 500 elevation math sub-elements);
-  center frequency 10 MHz; sampling 40 MHz (NS200BW, 4 samples/wavelength); speed of
-  sound 1490 m/s; single normal plane-wave transmit per rotation angle; 180° rotation,
-  1° step (180 frames). Parameters match the paper simulation.
 
-## Dataset Format
-zea file format (HDF5), one file per acquisition, **single track**: the raw
-channel RF + scan parameters live in the standard data/scan groups
-(`tracks/track_0` on disk), and the paired eSAF label volume is stored as a
-**zea custom field** in the `custom` group (`custom/saf_bmode`, read via
-`zea.File.custom` — see below). The fused SAF volume is a single frame, so it
-cannot share the data group with the ~180-frame `raw_data` (zea validates
-`n_frames` across all fields of a data group); the `custom` group is the zea
-mechanism for exactly such data, and keeping the file single-track avoids the
-`track_schedule` warning a multi-track file would print on every load.
-Pre-processing — *simulated:* none
-beyond the forward model (raw RF, not demodulated/decimated); *measured:* time-tag
-frame→angle synchronisation, per-angle dwell averaging, and centre-plane-wave selection
-(still raw per-element RF, not demodulated/decimated; `scan/demodulation_frequency`
-records the 10 MHz demodulation applied by the reference pipeline). The probe
-rotation per frame is stored as the zea **`metadata/probe_pose`** trajectory
-(`rotation_representation="euler_xyz"`, **radians**; the array rotates about its
-axial axis, so the angle is the z Euler component and the translation is zero).
-Note `probe_pose/sampling_frequency = 1.0 Hz` is a **nominal** one-pose-per-frame
-value, not a physical acquisition rate. Every file is
-written with `zea.File.create()` (`sim/sim_dataset_to_zea.py` +
-`sim/pack_saf_labels.py`, source) and carries a
-`zea_version` stamp, so zea loads it natively (not as a legacy file).
-
-**Paired pre-/post-SAF labels (the dataset's target output).** Each file also carries
-the **elevational-SAF reconstructed 3D B-mode volume** as the custom field
-**`custom/saf_bmode`**: `values` is `(1, z, x, y)` float32 in **dB** (log-compressed
-normalized envelope, 0 dB = volume max, empty pixels −inf) and `coordinates` holds
-the per-pixel `[x, y, z]` positions in **meters**, shape `(z, x, y, 3)`; both carry
-`description`/`unit` attributes. This is
-the *post*-SAF **output/label** paired with the *pre*-beamformed **input**
-(`data/raw_data`):
-the raw channel RF is back-projected through the published eSAF algorithm
-(`matlab/saf/safrot_backproj.m`, source: in-plane DAS → `recon_3d` → `safrot_backproj`,
-elevational focus 45 mm, f-number 45/8) into a 3D volume `B_SAF(x,y,z)`, generated by
-`sim/make_saf_all.m` → `experiment/run_esaf_synced.m` (source) and written into the zea
-file by `sim/pack_saf_labels.py` (source). The stored volume covers
-a thin depth window (±2 mm) about the target; per-case arc-FWHM before/after and gain
-are in `data/manifest.json` and in the `description` attribute of
-`custom/saf_bmode/values`. Read it with `zea.File`:
+- **Data Collection Method:** synthetic and phantom.
+  - *Simulated (190):* Field II (MATLAB, `xdc_focused_array` + `calc_scat_multi`), scatterers rotated about the axial axis with the transducer fixed. **10 probe types** vary lateral aperture (`n_el` 32/68/128, pitch 0.1/0.2/0.3 mm), elevation height `H` (4/8/12 mm) and elevation focus `R` (25/45/90 mm or unfocused), encoded in the probe name (`tall_elev_H12` = `H` 12 mm; `baseline_R45_H8` = `R` 45 mm, `H` 8 mm) and in `probe/*`.
+  - *Measured (5):* rotational scans of the Japan Probe 68-element array on a wire/point phantom with a Galil-controlled 180° rotation, acquired as 7-angle CPWC, time-tag-synced to the motor angles and reduced to the centre (0°) plane wave per angle to match the simulation schema.
+- **Labeling Method:** synthetic ground truth. Target positions are exact, and each file's `description` attribute records probe and target, e.g. `probe=tall_elev_H12 target=point_z020_r6 r0=6.0mm z=20.0mm`. The paired eSAF volume (`custom/saf_bmode`) is the label.
+- **Acquisition system:** Japan Probe JP_Linear_68 (baseline): 68 elements, pitch 0.2 mm, element width 0.15 mm, element height 8 mm, elevational lens focus 45 mm; center frequency 10 MHz; sampling 40 MHz; sound speed 1490 m/s; one normal plane-wave transmit per rotation angle; 180° rotation in 1° steps. Parameters match the paper simulation.
+
+## Processing the Dataset
+
+The acquisitions can be processed with the `reconstruct.py` [script](https://github.com/open-h/OpenH-RF/blob/main/datasets/wpi/reconstruct.py) as provided in the [OpenH-RF GitHub repository](https://github.com/open-h/OpenH-RF), together with the `pipeline.yaml` definition in this folder and the [zea library](https://github.com/tue-bmd/zea). The script streams the data from the Hugging Face Hub, beamforms the rotation frame closest to ±90° (where an off-axis target lies in-plane) and plots it beside the per-frame rotation angle from `metadata/probe_pose`. Set `ZEA_FILE` and `FRAME` at the top of the script to pick another acquisition or frame. The default, frame 90 (~−90°) of [`data/experiment__acq_exp_30mm.hdf5`](https://huggingface.co/datasets/nvidia/OpenH-RF/blob/main/wpi/data/experiment__acq_exp_30mm.hdf5), gives:
+
+<p align="center"><img src="assets/bmode.png" width="70%" alt="B-mode frame of the measured phantom at -90 deg probe rotation, with the per-frame rotation-angle trajectory alongside it"></p>
+
+The rotational eSAF itself (in-plane DAS → `recon_3d` → `safrot_backproj`) is the published MATLAB implementation; its output is shipped in every file as `custom/saf_bmode`:
 
 ```python
 with zea.File("data/baseline_R45_H8__point_z080_r4.hdf5") as f:
@@ -130,46 +70,31 @@ with zea.File("data/baseline_R45_H8__point_z080_r4.hdf5") as f:
     print(saf["values"].description)  # axes + eSAF parameters + arc-FWHM
 ```
 
-A **MATLAB `.mat` version** of the same raw channel data + metadata, plus a
-**reference eSAF-beamformed** result and a `_ref.png` figure, is provided **per
-acquisition** alongside the source grid as `sim_dataset_out/<probe>/<target>.mat`
-and `..._ref.png` (each `.mat` holds the raw RF, the in-plane DAS, the metadata and
-the eSAF output produced with the published algorithm `matlab/saf/safrot_backproj.m`
-(source): in-plane DAS → `recon_3d` → `safrot_backproj`, f-number 45/8). A FWHM-vs-depth
-overview across probes is `sim_dataset_out/dataset_overview_r4.png`
-(`sim/dataset_overview.m`, source). The zea `.hdf5` acquisitions are **hosted on Hugging
-Face** at <https://huggingface.co/datasets/RyoMurakami/OpenH-RF-eSAF> (git-LFS).
-The MATLAB `.mat`/`_ref.png` intermediates are
-reproducible from source and kept on lab storage.
+## Dataset Format
+
+[zea v0.1.6](https://github.com/tue-bmd/zea)
+
+One zea HDF5 file per acquisition, single track. The raw channel RF and scan parameters are in the standard data/scan groups (`tracks/track_0`); the probe rotation per frame is the **`metadata/probe_pose`** trajectory (`euler_xyz`, radians, rotation in the z component, zero translation; `sampling_frequency = 1.0 Hz` is nominal, one pose per frame).
+
+The paired eSAF label is the zea custom field **`custom/saf_bmode`**: `values` is `(1, z, x, y)` float32 in dB (0 dB = volume max, empty pixels −inf) over a ±2 mm depth window about the target, and `coordinates` holds the per-pixel `[x, y, z]` in metres. It lives in `custom` rather than the data group because it is a single frame, while `raw_data` has ~180. The per-case arc-FWHM before/after is in the `description` of `custom/saf_bmode/values`.
+
+Pre-processing: none for the simulations beyond the forward model; for the measured scans, frame-to-angle synchronisation, per-angle dwell averaging and centre-plane-wave selection. Both remain raw per-element RF (not demodulated or decimated).
 
 ## Dataset Quantification
 
 **Current OpenH-RF release:** 195 HDF5 files; 1.87 GB (1,870,462,976 bytes) stored; root `zea_version` **0.1.6**. Sizes include all HDF5 contents and use decimal units (MB = 10^6 bytes, GB = 10^9 bytes, TB = 10^12 bytes), not decoded-array memory or original-source download sizes.
 
 - **Acquisitions:** **195** = **190 simulated** + **5 measured phantom**.
-  - *Simulated (190):* **10 probe types × 19 targets** (16 single points over depth
-    {20,45,80,130} mm × radial offset from the rotation centre {0,2,4,6} mm, plus 3
-    pair/oblique cases). The probe and target axes are listed in `data/manifest.json`. (The
-    earlier compatible set has 18 acquisitions.)
-  - *Measured (5):* real rotational phantom scans at nominal depths {10,20,30,40,45} mm
-    (`experiment__acq_exp_*.hdf5`), centre plane wave, ~182 measured rotation angles
-    over ~180°.
-- **Frames per acquisition:** simulated 180 (one per 1° step); measured ~182 (the
-  actual encoder angles are stored in `metadata/probe_pose` — z Euler component,
-  radians — not necessarily uniform).
+  - *Simulated (190):* **10 probe types × 19 targets** (16 single points over depth {20,45,80,130} mm × radial offset from the rotation centre {0,2,4,6} mm, plus 3 pair/oblique cases). The probe axis is listed above under Data Collection Method; each file's own `description` attribute gives its exact probe/target/r0/depth. (The earlier compatible set has 18 acquisitions.)
+  - *Measured (5):* real rotational phantom scans at nominal depths {10,20,30,40,45} mm (`experiment__acq_exp_*.hdf5`), centre plane wave, ~182 measured rotation angles over ~180°.
+- **Frames per acquisition:** simulated 180 (one per 1° step); measured ~182 (the actual encoder angles are stored in `metadata/probe_pose` — z Euler component, radians — not necessarily uniform).
 - **Stored HDF5 size:** 1.87 GB (1,870,462,976 bytes), including the paired `saf_bmode` label volumes.
-- **Train/val/test split:** N/A (benchmark / characterization set; the probe × depth ×
-  radius axes are the intended study dimensions).
+- **Train/val/test split:** N/A (benchmark / characterization set; the probe × depth × radius axes are the intended study dimensions).
 
 ### Per-sample feature table
-Shapes use placeholders because dimensions vary across the probe grid and between
-simulated and measured scans: **`n_frames`** = 180 (simulated, one per 1° step) or
-~182 (measured encoder angles); **`n_el`** ∈ {32, 68, 128} (probe grid; 68 for the
-baseline and all measured scans); **`n_ax`** = axial sample count (per case);
-**`n_z`** = depth samples of the label volume (target ± ~2 mm window).
+Shapes use placeholders because dimensions vary across the probe grid and between simulated and measured scans: **`n_frames`** = 180 (simulated, one per 1° step) or ~182 (measured encoder angles); **`n_el`** ∈ {32, 68, 128} (probe grid; 68 for the baseline and all measured scans); **`n_ax`** = axial sample count (per case); **`n_z`** = depth samples of the label volume (target ± ~2 mm window).
 
-Paths below are inside each `.hdf5`; with `zea.File` use `f.data` / `f.scan` /
-`f.metadata.probe_pose`, and `f.custom` for the SAF label volume.
+Paths below are inside each `.hdf5`; with `zea.File` use `f.data` / `f.scan` / `f.metadata.probe_pose`, and `f.custom` for the SAF label volume.
 
 | field (HDF5 path)                 | shape                          | dtype   | units | description |
 |-----------------------------------|--------------------------------|---------|-------|-------------|
@@ -191,74 +116,38 @@ Paths below are inside each `.hdf5`; with `zea.File` use `f.data` / `f.scan` /
 | `custom/saf_bmode/coordinates` | (n_z, n_el, n_el, 3)             | float32 | m     | per-pixel `[x, y, z]` positions of the label volume (target ± ~2 mm depth window) |
 
 ## Subject Metadata
-No human or animal subjects / no PHI. Each file stores `metadata/subject/type`:
-`simulated phantom` for the Field II simulations, `phantom` for the measured
-`experiment__*` scans. Creator attribution is stored per file in `metadata/credit`.
+
+No human or animal subjects / no PHI. Each file stores `metadata/subject/type`: `simulated phantom` for the Field II simulations, `phantom` for the measured `experiment__*` scans. Creator attribution is stored per file in `metadata/credit`.
 
 ## Data Validation
-`reconstruct.py` (**runnable, verified** — official `zea` API, no fallback code)
-loads one zea acquisition, reads its acquisition parameters via
-`zea.Config.from_path('pipeline.yaml')` + `File.load_parameters`, beamforms the
-rotation frame closest to ±90° rotation magnitude (the frame where an off-axis target
-lies in-plane; this handles signed encoder angles too — measured scans run 0 → ~−180°)
-with the native `zea.Pipeline` op chain **Cast → Demodulate → Beamform(delay_and_sum) →
-EnvelopeDetect → Normalize → LogCompress** defined in `pipeline.yaml`, and writes a
-two-panel PNG: the B-mode image, and the per-frame probe **rotation angle**
-(from `metadata/probe_pose`, plotted in degrees) so downstream users know how to
-interpret the frame axis — the special data this dataset adds:
-```
-python reconstruct.py --input data/baseline_R45_H8__point_z080_r4.hdf5 --output out.png
-```
-The rotational **eSAF** across frames — the contribution of this dataset — is implemented in
-`matlab/saf` (source) (`recon_3d` → `safrot_backproj`); per-probe before/after eSAF reference
-images and a FWHM-vs-depth overview accompany the MATLAB `.mat` release
-(`sim/dataset_overview.m`, source), and the resulting paired SAF volume is stored as
-the `custom/saf_bmode` custom field of every `.hdf5` (see Dataset Format above).
+
+`reconstruct.py` beamforms a single rotation frame with the `pipeline.yaml` chain (Cast → Demodulate → Beamform(delay_and_sum) → EnvelopeDetect → Normalize → LogCompress) and plots the stored rotation trajectory beside it, as a check on the acquisition parameters and the frame-to-angle mapping.
+
+The eSAF labels were checked per case with the arc-FWHM of the rotational smear before and after eSAF, shown here annotated for the case in the hero image:
+
+<p align="center"><img src="assets/esaf_topview_before_after.png" width="60%" alt="Annotated top-view MIP: mm axes, the rotation axis and its 180 degree sweep, a color legend, and the arc-FWHM numbers"></p>
 
 ## Known Issues
-- **Paired SAF label — on-axis targets (r0 = 0) do not narrow, by design.** eSAF
-  refocuses the *rotational elevation smear*; a target sitting on the rotation axis has
-  essentially no smear, so its `saf_bmode` label volume is not sharper than the input (arc-FWHM
-  gain ≈ 1). This is expected physics, not a defect — the 40 on-axis cases (median gain
-  1.00×) are included so the pair covers the degenerate no-smear case. Off-axis targets
-  (n=120, median gain 1.75×, up to ~12×) and paired/oblique targets (n=30, median 3.71×)
-  improve clearly; targets at the focal depth (~45 mm) and weak-elevation-focus probes
-  (`efocus_deep_90`, `elev_unfocused`) have less smear to recover. Across all 195 cases,
-  median arc-FWHM gain is 1.36× (42 cases < 1×, mostly the on-axis/near-focus group above).
-  Arc-FWHM is measured on a **centred** reconstruction: the smear circle passes through both
-  the rotation axis and the target (not a circle centred on the rotation axis). The eSAF
-  back-projection uses a fixed elevational focus of 45 mm; per-depth focus tuning (see
-  `docs/eSAF_focus_depth_study_JP.md`, source) can further sharpen deep off-axis cases but was
-  not applied here (single as-designed focus).
-- **Measured phantom depth window.** The real reflector bead sits **~4 mm off the rotation
-  axis** (not on-axis) and, for each scan, slightly deeper than the folder's nominal depth
-  label; labels are reconstructed over the interactively-identified reflector depth window
-  (not a naive nominal-depth ± 2 mm window), which matters because a mis-centred window can
-  pick up near-axis clutter instead of the actual bead.
-- **Simulated** data (Field II spatial-impulse-response model): realistic transducer
-  field, but no tissue attenuation, aberration, multiple scattering, or electronic
-  noise. Not a substitute for measured data.
+
+- **Paired SAF label — on-axis targets (r0 = 0) do not narrow, by design.** eSAF refocuses the *rotational elevation smear*; a target sitting on the rotation axis has essentially no smear, so its `saf_bmode` label volume is not sharper than the input (arc-FWHM gain ≈ 1). This is expected physics, not a defect — the 40 on-axis cases (median gain 1.00×) are included so the pair covers the degenerate no-smear case. Off-axis targets (n=120, median gain 1.75×, up to ~12×) and paired/oblique targets (n=30, median 3.71×) improve clearly; targets at the focal depth (~45 mm) and weak-elevation-focus probes (`efocus_deep_90`, `elev_unfocused`) have less smear to recover. Across all 195 cases, median arc-FWHM gain is 1.36× (42 cases < 1×, mostly the on-axis/near-focus group above). Arc-FWHM is measured on a **centred** reconstruction: the smear circle passes through both the rotation axis and the target (not a circle centred on the rotation axis). The eSAF back-projection uses a fixed elevational focus of 45 mm; per-depth focus tuning (see `docs/eSAF_focus_depth_study_JP.md`, source) can further sharpen deep off-axis cases but was not applied here (single as-designed focus).
+- **Measured phantom depth window.** The real reflector bead sits **~4 mm off the rotation axis** (not on-axis) and, for each scan, slightly deeper than the folder's nominal depth label; labels are reconstructed over the interactively-identified reflector depth window (not a naive nominal-depth ± 2 mm window), which matters because a mis-centred window can pick up near-axis clutter instead of the actual bead.
+- **Simulated** data (Field II spatial-impulse-response model): realistic transducer field, but no tissue attenuation, aberration, multiple scattering, or electronic noise. Not a substitute for measured data.
 - Speed of sound is 1490 m/s, matching the paper Table 1 and the experiment.
-- A single normal plane-wave transmit per rotation angle is simulated (the dataset
-  stores n_tx = 1); multi-angle compounding is left to downstream users.
-- **Measured scans:** acquired as 7-angle CPWC; only the **centre (0°) plane wave** is
-  kept here to match the n_tx = 1 schema. The dwell frames per angle are averaged before
-  storage (noise reduction). Real reflectors are not ideal point scatterers — expect
-  reverberation/clutter near the surface and specular layering; rotation angles are the
-  measured encoder values (slightly non-uniform, full span ≈ 180°, sign per encoder
-  direction). The elevational lens focus is the nominal 45 mm, but the effective
-  back-projection focus for eSAF is depth-dependent on real data (see
-  `docs/eSAF_focus_depth_study_JP.md`, source).
+- A single normal plane-wave transmit per rotation angle is simulated (the dataset stores n_tx = 1); multi-angle compounding is left to downstream users.
+- **Measured scans:** acquired as 7-angle CPWC; only the **centre (0°) plane wave** is kept here to match the n_tx = 1 schema. The dwell frames per angle are averaged before storage (noise reduction). Real reflectors are not ideal point scatterers — expect reverberation/clutter near the surface and specular layering; rotation angles are the measured encoder values (slightly non-uniform, full span ≈ 180°, sign per encoder direction). The elevational lens focus is the nominal 45 mm, but the effective back-projection focus for eSAF is depth-dependent on real data (see `docs/eSAF_focus_depth_study_JP.md`, source).
+
+## Ethical Considerations
+
+None. The data is either fully synthetic (Field II) or measured on an inanimate phantom: no human or animal subjects, no PHI, no consent or IRB constraints.
 
 ## Raw Source Data
-The raw, pre-conversion acquisition/simulation outputs that were processed into the
-zea `.hdf5` files above are archived (same CC BY 4.0 license) at
-<https://huggingface.co/datasets/RyoMurakami/OpenH-RF-eSAF-raw>: the raw Verasonics
-per-line channel-RF captures (`RFdata_line*.mat` + encoder logs) for the 5 measured
-acquisitions, and the per-case MATLAB intermediates (raw RF, in-plane DAS, eSAF
-output) for the 190 simulated cases. See that repository's README for how each
-maps to `data/*.hdf5` here.
 
-## Ethical Considerations
-None. The data is either fully synthetic (Field II) or measured on an **inanimate
-phantom** — no human or animal subjects, no PHI, no consent/IRB constraints.
+The raw pre-conversion outputs are archived under the same CC BY 4.0 license at
+<https://huggingface.co/datasets/RyoMurakami/OpenH-RF-eSAF-raw>: the raw Verasonics per-line
+channel-RF captures (with encoder logs) for the 5 measured acquisitions, and the per-case MATLAB intermediates (raw RF, in-plane DAS, eSAF output) for the 190 simulated cases.
+
+## Citation
+
+When using this dataset, please cite:
+
+> R. Murakami et al., "Elevational Synthetic Aperture Focusing for Rotated Array-Based Three-Dimensional Ultrasound Imaging," IEEE Access, 2025.