phantom材料的range.dat如何设置？

hoffman brain phantom 的例子是 :
   5
   0      0       Air     false 0.0  0.0  0.0  0.2
   0      33      Lung    false 1.0  0.0  0.0  0.2
   33     53      Breast  flase 0.0  1.0  0.0  0.2
   53     75      Plastic true   0.0  0.0  1.0  0.2
   75     200     Air     false 0.0  0.0  0.0  0.2

The first line must contain the number of materials (i.e. the number of subse- 
quent lines). The following lines contain either a material number (or range) followed by a material name  
(for the old format) or, for the new format, a material number (or range), a material name, a visibility 
boolean (true or false) and color attribute values (red, green, blue, alpha). If the old format is used, the  
phantom will be of a uniform dark red color.