LAWRENCE LIVERMORE REALISTIC PHANTOM

A Worldwide Reference Standard for In-Vivo Counting

The Lawrence Livermore Realistic Phantom was developed under the direction of the U.S Department of Energy, primarily as a reference standard for the in-vivo counting of emissions from low-energy transuranic nuclides.

The organs of interest are the lungs, liver and lymph nodes. Each of these may be radioactive or inert. These organs are accommodated in a male thorax generally similar to average adult males.

The Livermore phantom contains a synthetic bone skeleton molded within a soft-tissue-equivalent material. The organs are located in an internal cavity with a separate torso cover that closes the phantom. Anterior sections of ribs and the sternum are molded into this cover.

Soft-tissue-equivalent blocks are used to position the organs and fill significant air spaces, providing continuity of the soft tissues throughout the phantom. The phantom is shipped assembled with inert organs. Any or all of these organs can be replaced with radioactive organs, which are shipped in separate packages.

Organs

All organs are made of soft-tissue equivalent materials. Lungs are available with nuclides uniformly dispersed throughout the lung molding material. Optional organs (developed by RSD and not part of the original DOE specifications) are inert, but have holes in 2 cm2 grids. These either can be filled with inert plugs or with active capsules to establish any desired distribution within the lungs.

The liver as the same loading flexibility, but another option is available, designed for use with solutions having relatively short half-lives. This liver is a hollow shell with a fill/drain port.

If the liver is not required, it may be replaced with the Abdominal Contents, which are also available with a hole matrix, or active.

Lymph nodes are available as hollow shells or as active packets. Two are 8 mm in diameter by 17 mm long. A third is 13 mm in diameter by 25 mm long. They are positioned in recesses molded in a lymph node block.

Chest Overlay Plates

Transuranic emissions from individuals with varying amounts of muscle and/or adipose tissue may be so attenuated as to be undetectable. Chest overlay plates were developed to ensure the validity of in-vivo counting of such individuals.

There are three sets of plates, each in four graded thicknesses. One set
is equivalent to 87% adipose and 13% muscle, another is equivalent to 50% adipose and 50% muscle, and the third is equivalent to 100% muscle. Plates of each material and/or each thickness are available separately.
 

Targets

Three sets of concentric circles are drawn in permanent black ink over the torso cover and over each chest overlay plate. They range in 1 in. increments from 1 in. to 5 in. in diameter, with a 5.5 in. diameter outer circle. One set of circles is placed over each lung region, with the outer circle tangent to the inferior aspect of the clavicle and protruding over the sternum. The third set is placed over the liver.

A 2cm² grid is projected in red ink over most of the chest surface by the same technique that is used for the circles. All targets are consistent among all phantoms.

CATALOG NUMBERS

RS-500 LAWRENCE LIVERMORE REALISTIC PHANTOM SYSTEM:  Includes: torso and gridded torso cover, inert heart, lungs, lymph nodes, liver and liver envelope or abdominal contents.  All blocks needed for organ location and soft tissue continuity within torso.  Documentation. Permanent shipping and storage case.

RS-520 Active Capsule (Isotope and activity to be specified)

RS-521 Inert Capsule with sealing cap, to be filled by user

Chest Overlay Plates

LIVERMORE ORGANS

* Replaces Liver and Liver Envelope

Radionuclides

RSD routinely manufactures active organs with isotopes to suit users’ needs. Active capsules to fit into the gridded holes are available, or empty capsules can be supplied to be filled by the user.

RSD usually supplies the required isotopes, but users may furnish them if so desired.

Isotopes are most often received as calibrated solutions, traceable to the NIST. Organ loading is controlled by micropipetting aliquots from the calibrated solutions. Uraniums and plutoniums are traceable to the NIST by mass. Other isotopes are usually traceable by activity.

Some isotopes are manufactured only at intervals throughout the year, so delivery is subject to availability. In some cases, calibration costs from governmental sources are subject to wide fluctuations.

We also offer our Whole Body Pixy, Wounded Willy and Damaged Debbie along with sectional phantoms for all your modalities.

 Download our Quote Request form  (type right in the PDF file or write in it), and email it to [email protected]

Copyright © 2004 JZ Imaging & Consulting
Last modified: 07/08/14