PHANTOM Release History

Chronological technical record of PHANTOM releases, calculation updates, maintenance changes, and compatibility notes.

PHANTOM Library History

Public release and maintenance record for the NCI computational phantom libraries.

Latest update: August 20, 2026 Latest official release: August 11, 2026 Record begins: 2010

Corrected the 20- and 25-week breech fetal surfaces to remain within the uterus.
Fixed pregnant-phantom volume clipping by sizing single-resolution grids from the anatomical mesh bounds with padding, then regenerated all affected arm and armless NIfTI phantoms.
Updated and validated the related metadata, MCNP files, and master workbook.

Renamed and reorganized PHANTOM folders so the main libraries are easier to browse: nci-reference, nci-size, nci-pregnant, and icrp-reference.
Standardized release filenames across NIfTI, DICOMRT, Monte Carlo input files, and the master workbook, now named phantom-mastertable.xlsx.
Updated the pregnant phantom release so arm/armless and single-/multi-resolution folders use a consistent naming pattern. Cephalic presentations are included for all gestational ages, with breech presentations included where available.
Added starting MCNP input files for the pregnant multi-resolution phantoms, with one input file per gestational age and clear options for available fetal presentations.
Simplified the ICRP armless folder so NIfTI files are stored directly in icrp-reference/armless, while DICOMRT files remain in the dicomrt subfolder.
Consolidated folder-level notes into the PHANTOM user manual so the release package is cleaner and easier to navigate.
Improved the NIfTI files so common imaging and analysis software can recognize them more consistently as label-map phantoms.
Placed NCI reference-size NIfTI files directly in their arm/resolution folders, matching the layout used by the NCI size-dependent library.
Updated adult phantom naming to use the 35 reference-adult age code, consistent with the ICRP adult reference convention.

Added an additional armless NCI size-dependent NIfTI set with a lower in-plane resolution and a higher slice resolution, covering all 362 size-dependent phantoms.
Reorganized the download folder so users first choose the phantom library and then choose the available format or posture.
Standardized the names of the smallest newborn size-dependent phantoms across the files and master table.
Corrected the low-resolution newborn files so their body height and voxel spacing are consistent with the rest of the library.
Added missing legacy binary files for the two smallest newborn phantoms.

Added compressed NIfTI (.nii.gz) versions of the NCI reference-size, size-dependent, and pregnant phantom libraries.
Released NIfTI datasets for NCI reference-size phantoms with arms at high resolution; NCI pregnant woman phantoms at high resolution; and NCI size-dependent phantoms with and without arms at high and low resolution.
The reference-size dataset includes 12 phantoms, each size-dependent dataset includes 362 phantoms, and the pregnant dataset includes 8 phantoms.
All NIfTI datasets preserve the organ-label information from the corresponding phantom library.
Moved legacy binary voxel files to the archive area for compatibility with existing workflows at the time of this release.
Recommended NIfTI for new downloads because it is smaller, easier to share, and can be read directly by common medical-imaging software.
Compressed NIfTI made release of the full high-resolution NCI size-dependent library practical despite the size of the corresponding raw binary files.

Expanded anatomical detail across the NCI reference-size and body size-dependent phantom libraries.
Added refined cardiac substructures, including heart chambers, myocardium, coronary arteries, cardiac valves, and conduction nodes.
Incorporated the full 362-phantom body size-dependent library, including the 11 small pediatric phantoms added in the January 27, 2024 update.
Unified the reference-size and body size-dependent master tables to improve consistency in organ names, organ IDs, and supporting information.
Recalculated organ volumes and masses using a consistent workflow.
Updated skeletal dose-response data used for marrow and endosteum dose estimation.

Released the 362 size-specific phantoms at low resolution.
Released DICOM-RT datasets containing DICOM CT and RT Structure data for ICRP reference pediatric and adult phantoms, UF/NCI pregnant women with fetus phantoms, and UF/NCI reference-size phantoms.

Added 11 pediatric phantoms to the size-specific phantom library, bringing the total to 362.

Adjusted ovary locations using measurements from Kelsey et al. (2013).
Adjusted breast locations using CT images from the NWTS cohort.
Applied the updates to both reference-size and body size-dependent phantom libraries.

Developed methods to convert binary voxel phantoms to DICOM CT images and DICOM structure sets.
Converted the reference-size and body size-dependent libraries.

Updated the body-shape adjustment factor for selected size-dependent phantoms to improve consistency across the library.

Separated arm structures to support armless phantom versions.
Refined bone and marrow-related anatomy.
Corrected overlap issues involving the ovaries, uterus, and colon.
Completed the body size-dependent phantom library in collaboration with the University of Florida.