us4us/README.md

metadata

pretty_name: OpenH-RF — us4us Ring-Array USCT (forearm, breast phantom, water)
license: cc-by-4.0
task_categories:
  - other
tags:
  - ultrasound
  - rf
  - openh-rf
  - zea
  - usct
  - tomography
  - ring-array
  - attenuation
  - forearm
language:
  - en
size_categories:
  - n<1K

Dataset Description

Raw RF data acquired with the us4us Ltd. us4R system and a Draminski ring probe.

Intended for ultrasound tomographic reconstruction.

Acquisitions were performed on:

• the left and right human forearms of 8 healthy volunteers,
• a Yezitronix B-RG-1.2 breast phantom,
• a single reference slice from water only.

The forearm and phantom acquisitions comprise consecutive slices spaced 9 mm apart in depth (half of the probe elevation).

Each slice was recorded using 1024 subsequent single-element transmissions, and received by a 512-element aperture located opposite the transmitting element.

Dataset Contributors

PI: Ziemowit Klimonda

Team: Piotr Jarosik, Jakub Rozbicki, Piotr Karwat, Marcin Lewandowski (all @ us4us Ltd. (https://us4us.eu/))

Dataset Creation Date

09/07/2026

License

CC BY 4.0

Intended Usage

Ultrasound computed tomography image reconstruction.

Dataset Characterization

• Data Collection Method: phantom, healthy adult human volunteers.
• Labeling Method: N/A.
• Acquisition system:
  • ring probe:
    • probe radius: 130mm,
    • number of elements: 1024,
    • center frequency: 2MHz,
    • sampling rate: 8125000.0,
  • us4R research system + host PC,
  • custom positioning system for subject spatial control.
• Tx/Rx scheme:
  • the scheme consisted of 1024 transmit-receive events,
  • each event consisted of a single probe element transmitting a short pulse (1 period at 2 MHz excitation), while 512 probe elements were used for reception,
  • the 1024 transmit events were performed sequentially, with each probe element transmitting once,
  • for each transmission, the center of the receiving aperture was positioned on the opposite side of the probe relative to the transmitting element,
  • for example, for the 0th transmission, the 0th probe element transmitted, and the receiving aperture consisted of probe elements 256–767.

Dataset Format

All sub-datasets are provided in the ZEA file format. No preprocessing was performed on the raw channel data.

Dataset Quantification

Current OpenH-RF release: 18 HDF5 files; 32.66 GB (32,658,423,808 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.

• Each HDF5 file contains 10 slices of the subject, except reference_water.hdf5, which contains a single slice.
• Stored HDF5 file sizes vary: 1.89 GB to 1.95 GB excluding the water reference. reference_water.hdf5 is 183,107,584 bytes (183.11 MB).

Subject Metadata

The dataset contains data from:

• breast phantom Yezitronix B-RG-1.2,
• both forearms of 8 healthy human volunteers (2 females and 6 males, age range [20, 55]),
• water only (reference data).

Data Validation

• The data files contain attenuation sinograms and images reconstructed from raw data using the filtered backprojection algorithm.

Known Issues

• The following probe elements should be considered damaged: [367, 409, 457, 764, 775, 776, 368, 390, 470, 739, 792].

Ethical Considerations

• All human subjects were healthy adults who voluntarily participated in the measurements.