---
Name: "OpenH-RF UBC Module A Corrected Synthetic-Channel S-WAVE Phantom Dataset"
license: cc-by-4.0
task_categories:
  - image-to-image
tags:
  - openh-rf
  - zea
  - ultrasound
  - rf
  - elastography
  - phantom
  - synthetic-data
  - 3d
language:
  - en
size_categories:
  - 1K<n<10K
---

# Module A

## Dataset Description

This submission contains eight 3-D Shear-Wave Absolute Vibro-Elastography
(S-WAVE) acquisitions of CIRS model 039 Shear Wave Liver Fibrosis Phantom
samples. The source scanner export contains beamformed 64-line RF rather than
measured pre-beamforming channel capture. Accordingly, every submitted zea
`raw_data` frame (stored at `/tracks/track_0/data/raw_data`) is explicitly
labeled **in-silico/synthetic**: a dense
point-scatterer field is estimated from one corrected source line-RF frame and
forward-simulated through a documented 64-transmit, 128-receive-element model.

The files are physically delay-consistent and reconstruct with zea-native
scanline delay-and-sum. They are not recovered or measured scanner channel
data, and they must not be represented as such.

## Dataset Contributors

University of British Columbia. Primary contact: Zongze Li
(`zongze@student.ubc.ca`). Proposed contributors retained from the original
Module A data card: Septimiu E. Salcudean, Robert Rohling, Qi Zeng, Tajwar Abrar
Aleef, Hamid Moradi, Mohammad Honarvar, Wanwen Chen, Zijian Wu, Yuxin Chen, Yu
Chung Lee, Zongze Li, Patrick Boyan Chen, and Michael Frew.

## Dataset Creation Date

09/01/2026 for this corrected zea-beamformable synthetic-channel package. The source
phantom acquisitions predate this packaging.

## License / Terms of Use

The dataset package is licensed under [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).

## Intended Usage

The package supports raw-to-B-mode reconstruction tests, ultrasound
beamforming research, synthetic-channel modeling, per-plane RF analysis, and
3-D placement using the retained motor-plane geometry. The original proposal
described derived S-WAVE elasticity estimates or maps; those products are not
available in this release due to missing data. `/custom/labels/factory_elasticity_kpa` is the CIRS
factory-rated nominal stiffness, not a derived S-WAVE estimate.

## Dataset Characterization

- Data Collection Method: physical phantom source acquisition followed by a
  deterministic in-silico channel simulation.
- Labeling Method: CIRS factory-rated nominal phantom elasticity.
- Acquisition System: Ultrasonix/Sonix with 4DEC9-5/10 end-firing 3-D probe.
- Submitted Data Tier: phantom / simulation.
- Simulation Framework: custom deterministic NumPy/SciPy forward simulator;
  files and reconstruction were validated with zea 0.1.4.

Acquisition and simulation details:

- Source system: Ultrasonix/Sonix with 4DEC9-5/10 end-firing 3-D probe.
- Source content: 20 motor planes × 25 retained temporal RF frames × 64
  beamformed scan lines × 5,196 axial samples per case.
- Corrected RF ordering: the 108 stored 16-line events per plane contain two
  complete setup images at events 0-3 and 4-7, followed by four sector-major
  groups of 25 temporal frames. Temporal frame `k` is assembled from raw events
  `[8+k, 33+k, 58+k, 83+k]`.
- Temporal frames: all corrected source frames 0-24 are retained; none are
  deleted or wrapped.
- Cases / nominal stiffnesses: 1.83, 2.8, 6.2, 6.39, 7.79, 11.63, 17.47,
  and 21.23 kPa.
- Source line-RF sampling frequency: 40 MHz.
- Source temporal sampling: 250 Hz (4 ms between retained RF frames within a
  plane); 20 motor planes span approximately 27.78° from first to last centre.
- Simulated channel sampling frequency: 20 MHz.
- Transmit/demodulation center frequency: 4 MHz.
- Sound speed used by simulation and reconstruction: 1,540 m/s.
- Probe geometry: 128 elements on a 10.0-mm-radius convex arc with 0.17-mm
  pitch and 6.5-mm elevation height.
- Sector: 64 focused lines spanning 124.68°; the manufacturer-listed 149°
  value is the extended-sector capability, not the normal sector used here.
- Transmit focus: 30 mm; modeled transmit aperture: F/1.5.
- Simulated inter-transmit interval: 250 microseconds; the final interval in
  each one-frame file is zero because no later transmit is stored in that file.
- Scatterers: 256 per source line (16,384 per output frame), with deterministic
  frame-specific sub-line and sub-sample jitter.
- Channel trace: 3,546 samples (177.3 microseconds), including a final exact-zero
  tail of 400 samples (20 microseconds).
- Quantization: `int16`, scaled to an absolute peak of 26,000; no sample reaches
  int16 full scale.

## Dataset Format

There are 8 × 20 × 25 = **4,000** one-frame HDF5 files. One file per source
frame keeps full zea schema validation and reconstruction memory-bounded.
For motion analysis, group files by case and motor plane, then order `f00`
through `f24`; `/custom/source_provenance/source_timing` retains the source
clock index, within-plane temporal offset, and relative plane timestamp.

```text
module_A/
  acquisitions/
    case_1.83/
      ubc_swave_cirs_1.83_p00_f00.hdf5
      ...
    case_2.8/
      ...
    ...
  README.md
  pipeline.yaml
```

Each HDF5 file contains the following per-sample features:

Numeric arrays use zea 0.1.4's native frame-chunked Blosc/Zstd plus bitshuffle
compression; reading these arrays requires `hdf5plugin`, which is imported by zea.

| Name | Shape | Dtype | Units | Description |
|---|---:|---|---|---|
| `/tracks/track_0/data/raw_data` | `(1, 64, 3546, 128, 1)` | `int16` | scaled ADC-like counts | Synthetic RF ordered frame, transmit, axial sample, receive element, RF component. |
| `/probe/probe_geometry` | `(128, 3)` | `float32` | m | Curved-array element positions. |
| `/tracks/track_0/scan/polar_angles` | `(64,)` | `float32` | rad | Focused transmit angles. |
| `/tracks/track_0/scan/t0_delays` | `(64, 128)` | `float32` | s | Per-transmit element delays. |
| `/tracks/track_0/data/image/values` | `(1, 256, 64, 1)` | `uint8` | display intensity | Native line-RF reference display; not used as a reconstruction input. |
| `/custom/source_provenance/source_native_line_rf` | `(64, 5196)` | `int16` | source ADC counts | Preserved source beamformed line RF for this selection. |
| `/custom/source_provenance/source_event_indices` | `(4,)` | `int32` | zero-based event index | Original 16-line E-scan event selected for sectors 0-3. |
| `/custom/simulation/scatterer_positions` | `(16384, 3)` | `float32` | m | Point-scatterer positions used for channel simulation. |
| `/custom/source_provenance/*` | mixed | mixed | documented per field | Source indices, plane transform, timing, and excitation settings. |

Synthetic provenance is written at the HDF5 root and on the raw-data dataset:
`synthetic=true`, `in_silico=true`, and `data_origin=in-silico/synthetic`.

## Dataset Quantification

- Number of source acquisitions: 8.
- Number of motor planes per acquisition: 20.
- Number of retained temporal RF frames per plane: 25.
- Number of submitted HDF5 samples: 4,000.
- Train / validation / test split: not predefined.
- Per-sample raw tensor: `1 × 64 × 3546 × 128 × 1`, `int16`.
- Per-sample source line-RF tensor: `64 × 5196`, `int16`.
- Exact HDF5 payload size: **108,889,767,936 bytes** (108.890 GB; 101.412
  GiB).

## Subject Metadata

The source consists of eight phantom acquisitions only, one for each listed
factory-rated stiffness. There are no human or animal subjects and no subject
demographics. The phantom model is CIRS model 039 Shear Wave Liver Fibrosis
Phantom.

## Data Validation

The contributor reports validation with Python 3.12.3 and zea 0.1.4.
The contributor's reconstruction reads only the zea `raw_data` field and
acquisition parameters, not the stored image or preserved source line RF:

```text
Cast to float32
  -> RF demodulation
  -> zea delay_and_sum with enable_scanline=true
     and enable_aligned_apodization=true
  -> Envelope detection
  -> 99.5th-percentile normalization
  -> -50..0 dB log compression
  -> sector scan conversion
  -> PNG
```

In scanline mode the output has 64 angular lines—one per stored focused
transmit. zea constructs the one-line-per-transmit grid and the one-hot aligned
transmit mask internally; no custom `flat_pfield` or transmit-weight code is
used.

`pipeline.yaml` records the reconstruction configuration.
`zlims: [0.0001, 0.100023]` are line depths from
each transmit origin on the curved element surface.

The contributor reports structural checks across all files, plus full zea
schema validation and raw-only reconstruction on three distributed samples
from each case (24 samples). For those samples, the preserved source line RF
was also compared with the original E-scan events.

This HF release includes the HDF5 files, this card, and the pipeline
configuration. Review outputs, standalone reconstruction scripts, and
validation sidecars are not included.

## Known Issues

- The measured source is beamformed line RF. The submitted 128-channel data are
  deterministic forward simulations conditioned on that source.
- The simulation preserves source-derived spatial and temporal contrast but
  cannot recover proprietary scanner receive processing or true measured
  element-level noise/coupling.
- The stored image is a reference only and is deliberately excluded from the
  reconstruction path.
- Mechanical excitation frequencies (40, 50, and 60 Hz) are simultaneous.
  Configured phases are retained in source setting units; absolute
  actuator-to-ultrasound phase synchronization is not claimed.
- A scanner TGC curve, probe bandwidth, and exact transmit waveform were not
  available. Reconstruction therefore applies no TGC and uses the documented
  simulation pulse.

## Ethical Considerations

The data are phantom acquisitions only. There are no human subjects, no PHI,
and no patient demographics. The phantom model is CIRS model 039 Shear Wave
Liver Fibrosis Phantom. Institutional data-release approval was confirmed in
the original contributor data card.