technion/phantom/README.md

metadata

name: technion-phantom
pretty_name: Technion Phantom Pre-Beamformed Channel Data
license: cc-by-4.0
task_categories:
  - image-to-image
tags:
  - ultrasound
  - iq
  - openh-rf
  - beamforming
  - phantom
  - 3d
language:
  - en
size_categories:
  - n<1K

Technion Tissue-mimicking Phantom Pre-beamformed RF Channel Data

Frame 6 of data/ph.hdf5, reconstructed by reconstruct.py.

Dataset Description

Pre-beamformed ultrasound channel data from a tissue-mimicking phantom, acquired on the same 64-element phased-array sector scheme as the in-vivo collection (180 transmit beams steered over ±45.13°, one image line per transmit), for calibration and verification. Contains resolvable point targets and an anechoic cyst — a clean reference for validating beamforming and reconstruction. 12 frames, one acquisition.

Dataset Contributor(s)

• Sanketh Vedula sanketh@campus.technion.ac.il (primary contact)
• Ortal Senouf
• Dean Zadok
• Alex M. Bronstein (PI)
• Technion – Israel Institute of Technology

Dataset Creation Date

Source data 2018; converted to the OpenH-RF (zea) format 07/16/2026.

License / Terms of Use

Creative Commons Attribution 4.0 International (CC BY 4.0). Retain attribution and identify modifications when reusing the data.

Intended Usage

Calibration and end-to-end verification of the beamforming/reconstruction pipeline (point-target resolution, cyst contrast). Phantom tier (×1).

Dataset Characterization

• Data Collection Method: phantom — tissue-mimicking phantom (Gammex 403GS LE, Gammex Inc., Middleton, WI, USA), acquired on the same scanner/probe as the in-vivo collection for calibration.
• Labeling Method: N/A (calibration target; known phantom geometry).
• Acquisition system: GE Vivid S70 scanner; GE 3Sc-RS 64-element phased-array probe, 0.30 mm pitch; sector scan, 180 transmit beams steered over ±45.13° (≈90.25° FOV), one image line per transmit; IQ demodulated at 3.44 MHz.

Processing the Dataset

The acquisitions can be processed with the pipeline.yaml definition in this folder and the zea library.

zea streams the data from the Hugging Face Hub and processes it according to the pipeline. You can try it out with the following command:

zea process \
  --dataset hf://nvidia/OpenH-RF/technion/phantom/data/ph.hdf5 \
  --config hf://nvidia/OpenH-RF/technion/phantom/pipeline.yaml \
  --n-frames 1

Alternatively, you can use the reconstruct.py script as provided in the OpenH-RF GitHub repository.

Dataset Format

zea v0.1.4

zea file format, a single HDF5 file data/ph.hdf5. Source complex samples repackaged to float32 I/Q (n_ch = 2), values verbatim. Carries metadata/subject/{id=ph, type=phantom}, metadata/credit, probe model (probe.name = GE 3Sc-RS) and scanner (us_machine = GE Vivid S70). ("phantom" is recorded only as subject.type, not as an anatomy or label.)

Dataset Quantification

Current OpenH-RF release: 1 HDF5 file; 659.95 MB (659,947,520 bytes) stored; root zea_version 0.1.4. 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.

• Frames / acquisitions: 12 frames · 1 acquisition.
• Stored HDF5 size: 659.95 MB (659,947,520 bytes).

Field	Shape	dtype	Units	Description
data/raw_data	(12, 180, 696, 64, 2)	float32	a.u.	pre-BF channel IQ: frames × tx-lines × axial × elements × {I, Q}
scan/sampling_frequency	scalar	float32	Hz	3.333 MHz
scan/center_frequency, demodulation_frequency	scalar	float32	Hz	3.44 MHz
scan/sound_speed	scalar	float32	m/s	1540
scan/polar_angles	(180,)	float32	rad	±45.13° steered lines
probe/probe_geometry	(64, 3)	float32	m	element positions, 0.30 mm pitch

Subject Metadata

N/A — inanimate phantom (GAMMEX 403GS LE); subject.type = phantom.

Data Validation

reconstruct.py reconstructs a B-mode from raw_data using the zea.Pipeline in pipeline.yaml (delay-and-sum on a polar scanline grid → envelope → normalization → log compression → sector scan conversion).

Reference output: bmode.png — frame 6 of data/ph.hdf5, shown above: resolvable point targets and a well-defined anechoic cyst at ~65 mm.

Known Issues

• Same scan scheme and probe as the in-vivo bladder collection (GE tissue-harmonic); acquired as its calibration reference. GAMMEX 403GS LE.

Ethical Considerations

None — inanimate phantom, no human or animal subjects.