technion/phantom/README.md

metadata

pretty_name: OpenH-RF — 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

OpenH-RF — Tissue-mimicking phantom pre-beamformed RF channel data

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, Ortal Senouf, Dean Zadok, Alex M. Bronstein (PI) — Technion – Israel Institute of Technology. Primary contact: sanketh@campus.technion.ac.il.

Dataset Creation Date

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

License / Terms of Use

CC BY 4.0 (proposal §8).

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.

Dataset Format

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). Run:

python reconstruct.py data/ph.hdf5 --frame 6 --out bmode_ph.png

Reference output: bmode_ph.png — 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.