Plaque Simulator
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For MacOSX 10.11 to 11.5.2

(Big Sur)


Version 6 User Guide

Whats new

EP917 History

MacOS 10.13 to 10.15


posted 9/6/2021

6.8.5 Full Installer (2.72 GB)

(x86/arm64 universal binary)

(for MacOS 10.11 to 11.5.2)


Misc. Utilities

6.8.5 User Guide (1.4 GB)

6.6.5 Email Utilities (5 MB)

1.0.0 PSQACheck (35 MB)

(MacOS and Windows versions)

PS References

1987-2015 .pdf format

Older Versions

For MacOSX 10.4 to 10.6

IMPORTANT NOTICE: If you have already, or intend to update to MacOS 10.13 (High Sierra) through MacOS 10.15 (Catalina) or MacOS 11 (Big Sur), please read this page regarding a cosmetic issue when loading patient files created under versions of MacOS prior to 10.13 (High Sierra). Plaque Simulator (PS6) version 6.6.2 adds support for MacOS 10.13. Plaque Simulator version 6.7.1 adds support for MacOS 10.14 (Mojave). Plaque Simulator version 6.7.2 adds support for MacOS 10.15 (Catalina).

Plaque Simulator version 6.7.8 adds compatibility with MacOS 11.1 (Big Sur) and computers that run on Apple silicon (arm64) system-on-a chip processors such as the M1. MacOS 11 radically changes many MacOS user interface elements including the appearance of controls (e.g. buttons and sliders) and windows (e.g. title bars and tool bars). To deal with these changes, the PS6 user interface implementation in PS 6.7.8 has been revised to maintain a similar appearance in both MacOS 10 and 11 and nearly identical appearance to earlier versions of PS6.

Screen captures in the user guide depict the appearance of the program at the time that user guide page was prepared. Due to continuous refinement of the Plaque Simulator application by Eye Physics and annual changes by Apple to the appearance of MacOS user interface elements, the screen captures you will find in the Plaque Simulator user guide may differ a bit (cosmetically) from the version of PS that you are running and/or the version of MacOS you are using. All versions should be compatible back to MacOS 10.11. The changes are described in the Whats new page.

IMPORTANT NOTICE: January 2015, to all users of BEBIG Plaque Simulator version 5 and earlier versions (PS5). PS5 is now 21 years old and has reached end-of-life as a sustainable product. The computers for which it was designed (Apple Macs with PowerPC processors) were phased out by Apple in 2005 and the last operating system that supported software emulation of the PowerPC processor was OSX 10.6 which was released in 2009.

Plaque Simulator version 6 (PS6) has been in development and testing since 2012 by Eye Physics, LLC and is now available to replace PS5. PS6 is designed for recent Apple Macintosh computers with Intel Xeon, Core i7 and i9 multicore processors running MacOS versions 10.11 through 10.15 (Catalina). PS6 leverages multiple cores to accelerate dosimetry calculations by distributing the work uniformly and concurrently amongst all available logical cores. Hardware recommendations are discussed in the PS6 User Guide.

Plaque Simulator is a 3D treatment simulation and modeling package for I-125, Pd-103, Ir-192 and Ru-106 plaque therapy of ocular tumors. Applicable ophthalmic tumors include choroidal melanoma in adults, retinoblastoma in young children and various forms of metastatic disease. In plaque therapy, small radioactive sources are embedded in a gold or silver bowl-like shell called a "plaque" which is placed on the surface of the eye adjacent to the tumor. The plaque directs therapeutic radiation towards the tumor while shielding the orbit and other surrounding anatomy.

The video below illustrates some of the features of Plaque Simulator image based conformal treatment planning which fuses CT or MR imaging, ultrasound and fundus photography to build a detailed model of each patient's eye. In this example isodose lines are plotted on the meridian plane passing through the tumor apex, a translucent isodose surface enclosing the tumor mass, and points of interest along the central axis of the plaque. Also seen are the rectus and oblique muscle attachments, the lens, optic nerve, I-125 seeds inside the plaque, the plaque shell, and its suture eyelets with their coordinate projections onto the scleral surface. These suture coordinates are provided to the surgeon to simplify implanting the plaque. This movie was created using PS version 6.

For Plaque Simulator technical support contact Eye Physics directly at

Plaque Simulator 6 is the property of Eye Physics, LLC. Following his retirement from the University of Southern California (USC) in 2010, Emeritus Professor of Radiation Oncology, Dr. Melvin Astrahan, PhD, incorporated Eye Physics and began the process of completely rewriting and modernizing the technologies he pioneered during his tenure at USC from 1984-2010. In North America, email technical support questions, bug reports and requests for teleconferencing appointments to the author Dr. Astrahan in Los Angeles at

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