History: The USC Plaques

Eye Physics (EP) plaques are much refined descendants of the plaque designs that were found to be the most useful at the University of Southern California (USC) from 1980 to 2010.

The first USC plaques were originally prototyped for Ir-192 seeds in the early to mid 1980s by LAC/USC physicist David Neblett (who in 1988 created the ROCS treatment planning program for the PC) and jeweler Jerry Schuber of nearby Commerce CA. The primitive seed positioning slots enabled the Ir-192 seeds to be mounted in reproducible loading patterns. These early Ir-192 plaques were retired in the late 1980s in favor of more refined second generation prototypes intended for I-125 seeds. Jerry sadly passed away of ALS disease in 2014.

In the late 1980s USC physicist Melvin Astrahan began development of the Plaque Simulator (PS) treatment planning software, worked with Jerry Schuber to revise the earlier USC Ir-192 plaque designs for I-125 seeds, prototyped many new plaque designs with much deeper seed positioning slots intended to also individually collimate the low energy radiation emitted by I-125 seeds, and eventually developed for PS the technology to prototype plaques using stereolithographic 3D printing. All EP plaques are compatible with seeds containing low energy radionuclides other than I-125 (e.g. Pd-103) so long as they conform to the now standardized cylindrical dimensions 0.8 x 4.5 mm.

USC1stGenPlaques

1st Generation Ir-192 Plaques: (circa 1985).


Eye Physics Plaques

Many of the items in this menu and its submenus are disabled (dimmed) because they are no longer in production (e.g. they may be obsolete) or they are new designs intended for stereolithographic 3D printing and are not yet available as gold castings for clinical use. All Eye Physics plaques that are currently in production and/or available for rental from IsoAid may be accessed from the Plaque Files and Rental Plaques menus. To access a disabled model simply option-click the menu item.

EP Plaques
EPPlaquesMenu

These are some of the 3rd Generation I-125 Plaques in development: (All 3rd gen. plaques are designed using PS6 and prototyped on our FormLabs 3D stereolithographic printer for direct to gold casting) EP 1821_24_Face

2nd Generation I-125 Plaques: (manually prototyped)


Eye Physics 2nd Gen. Plaque Files

PS also includes .iplq6 files with embedded pictures of the face for most of the Eye Physics 2nd generation (manually prototyped) slotted plaques. Click to enlarge.

EP517

EP517
  • 17 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 6.3
    • Template ≈ 2.9

EP917

EP917
  • 17 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 7
    • Template ≈ 3.2

EP930

EP930
  • 30 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 12.6
    • Template ≈ 5.8

EP2031

EP2031
  • 31 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 10.3
    • Template ≈ 4.0

EP2029

EP2029
  • 29 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 9.4
    • Template ≈ 3.7

EP2342

EP2342
  • 42 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 12.2
    • Template ≈ 4.5

EP2340

EP2340N
  • 40 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 12
    • Template ≈ 4.5

EP2249

EP2249
  • 49 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 13.22
    • Template ≈ 5.0

EP1925

EP1925
  • 25 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 11.7
    • Template ≈ 4.4

EP2025

EP2025
  • 25 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 10.5
    • Template ≈ 4.0

EPDonut

EPDonut
  • 34 seed slots
  • Sterilization surface area in sq. cm:
    • Plaque ≈ 00
    • Template ≈ 00

EP 2nd Gen. Plaques: seed coordinates and other information

When seed coordinates are displayed, the origin of the plaque coordinate system is shifted to the center of the concave surface of the plaque. The X axis of this coordinate system is the Central AXis (CAX) of the plaque. In the Plaque window you are looking at a 2D projection of the plaque onto the YZ plane.

Click the pictures below to enlarge.

EPPlaqueCoordinates

EP517

EP517gen2coordinates

EP917

EP917gen2coordinates

EP930

EP930gen2coordinates

EP2031

EP2031gen2coordinates

EP2029N

EP2029ngen2coordinates

EP2025

EP2025gen2coordinates

EP2342

EP2342gen2coordinates

EP2340N

EP2340Ngen2coordinates

EP2249

EP2249gen2coordinates