<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2800.1458" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=2>I can display three orthogonal slices referring to the
example.Now I want to choose some region on the axis image by mouse
moving and set their pixel value to zero.How can I achieve this?Is there
some examples suiting to my request?</FONT></DIV></BODY></HTML>