<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7652.24"> <TITLE>CompressedMatrix phantom object</TITLE> </HEAD> <BODY>  Hi, I am thinking to use compressedMatrix instead of parameterizedBoxMatrix to generate a voxelized phantom to save simulation time. On p 89 of the latest user guide manual, it says that I could exclude regions from being compressed by listing the materials. Is there any way to list a whole phantom (patient) in the exclude list other than listing all the organs?  What I am thinking to do is to compress all the voxels of the air around the phantom but not the phantom itself. Thanks in advance, Hyejoo <pre wrap> ===================================================================== Please note that this e-mail and any files transmitted with it may be privileged, confidential, and protected from disclosure under applicable law. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, or other use of this communication or any of its attachments is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting this message, any attachments, and all copies and backups from your computer. </pre></BODY> </HTML>