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Title: Radiation phantom with humanoid shape and adjustable thickness

Abstract

A radiation phantom comprising a body with a general humanoid shape and at least a portion having an adjustable thickness. In one embodiment, the portion with an adjustable thickness comprises at least one tissue-equivalent slice.

Inventors:
 [1];  [2];  [3];  [4];  [5]
  1. Pleasanton, CA
  2. Salem, NY
  3. Lodi, CA
  4. Livermore, CA
  5. Carmichael, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
907743
Patent Number(s):
7,151,252
Application Number:
10/915,889
Assignee:
The Regents of the University of California (Oakland, CA) LLNL
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE

Citation Formats

Lehmann, Joerg, Levy, Joshua, Stern, Robin L, Siantar, Christine Hartmann, and Goldberg, Zelanna. Radiation phantom with humanoid shape and adjustable thickness. United States: N. p., 2006. Web.
Lehmann, Joerg, Levy, Joshua, Stern, Robin L, Siantar, Christine Hartmann, & Goldberg, Zelanna. Radiation phantom with humanoid shape and adjustable thickness. United States.
Lehmann, Joerg, Levy, Joshua, Stern, Robin L, Siantar, Christine Hartmann, and Goldberg, Zelanna. Tue . "Radiation phantom with humanoid shape and adjustable thickness". United States. doi:. https://www.osti.gov/servlets/purl/907743.
@article{osti_907743,
title = {Radiation phantom with humanoid shape and adjustable thickness},
author = {Lehmann, Joerg and Levy, Joshua and Stern, Robin L and Siantar, Christine Hartmann and Goldberg, Zelanna},
abstractNote = {A radiation phantom comprising a body with a general humanoid shape and at least a portion having an adjustable thickness. In one embodiment, the portion with an adjustable thickness comprises at least one tissue-equivalent slice.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 19 00:00:00 EST 2006},
month = {Tue Dec 19 00:00:00 EST 2006}
}

Patent:

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  • A new radiation phantom with humanoid shape and adjustable thickness (RPHAT) has been developed. Unlike the RANDO{reg_sign} Phantom which is a fixed thickness, this newly designed phantom has adjustable thickness to address the variable thickness of real-world patients. RPHAT allows adjustment of the body thickness by being sliced in the coronal direction (as opposed to axial). Center slices are designed such that more sections can be added or removed while maintaining the anthropomorphic shape. A prototype of the new phantom has been successfully used in a study investigating peripheral dose delivery, where the amount of scatter within the patient, andmore » therefore the patient thickness, plays a critical role in dose deposition. This newly designed phantom is an important tool to improve the quality of radiation therapy.« less
  • A method is disclosed for selecting the minimum width of individual leaves of a multileaf adjustable collimator having sawtooth top and bottom surfaces between adjacent leaves of a first stack of leaves and sawtooth end edges which are capable of intermeshing with the corresponding sawtooth end edges of leaves in a second stack of leaves of the collimator. The minimum width of individual leaves in the collimator, each having a sawtooth configuration in the surface facing another leaf in the same stack and a sawtooth end edge, is selected to comprise the sum of the penetration depth or range ofmore » the particular type of radiation comprising the beam in the particular material used for forming the leaf; plus the total path length across all the air gaps in the area of the joint at the edges between two leaves defined between lines drawn across the peaks of adjacent sawtooth edges; plus at least one half of the length or period of a single sawtooth. To accomplish this, in accordance with the method of the invention, the penetration depth of the particular type of radiation in the particular material to be used for the collimator leaf is first measured. Then the distance or gap between adjoining or abutting leaves is selected, and the ratio of this distance to the height of the sawteeth is selected. Finally the number of air gaps through which the radiation will pass between sawteeth is determined by selecting the number of sawteeth to be formed in the joint. The measurement and/or selection of these parameters will permit one to determine the minimum width of the leaf which is required to prevent passage of the beam through the sawtooth joint.« less
  • An adjustable beam limiting diaphragm for high-energy rays emanating from a source adapted for radiation therapy is presented. The diaphragm plate sets are arranged in pile formation of constant length along the beam, each being composed of an L-shaped ray absorbing movable plate. Operating mechanisms are connected to the diaphragm plates for adjusting them relative to each other. (W.L.H.)