一、定义几何
几何的定义是设计仿真的关键步骤，因为它是通过描述成像设备和要扫描的对象的几何定义。然后通过几何的组件跟踪粒子。
1、The world
<1> The world is the only volume already defined in GATE when starting a macro.
<2> All volumes are defined as daughters or grand-daughters of the world.
<3> The world volume is a typical example of a GATE volume and has predefined properties.
<4> The world volume is a box centred at the origin. For any particle, tracking stops when it escapes from the world volume.
<5> The world volume can be of any size and has to be large enough to include all volumes involved in the simulation.
# World # Define the world dimensions /gate/world/geometry/setXLength 100 cm /gate/world/geometry/setYLength 100 cm /gate/world/geometry/setZLength 100 cm讯享网
2、Creating a volume
讯享网The tree includes the following commands: setMaterial: To assign a material to the volume attachCrystalSD: To attach a crystal-SensitiveDetector to the volume attachPhantomSD: To attach a phantom-SensitiveDetector to the volume enable: To enable the volume disable: To disable the volume describe: To describe the volume The tree includes sub-trees that relate to different attributes of the volume Volume_Name. The available sub-trees are: daughters: To insert a new 'daughter' in the volume geometry: To control the geometry of the volume vis: To control the display attributes of the volume repeaters: To apply a new 'repeater' to the volume moves: To 'move' the volume placement: To control the placement of the volume
SPECT中的例子
# CRYSTAL # Create the crystal volume /gate/SPECThead/daughters/name crystal /gate/SPECThead/daughters/insert box /gate/crystal/geometry/setXLength 1. cm /gate/crystal/geometry/setYLength 19. cm /gate/crystal/geometry/setZLength 28. cm /gate/crystal/placement/setTranslation 0. 0. 0. cm /gate/crystal/setMaterial NaI /gate/crystal/vis/setColor yellow3、Repeating a volume
<1> 要创建X个相同的卷，不需要创建X个不同的卷。必须创建一个卷，然后重复。
<2> Repeating a volume有四种不同的方式：线性中继器，环形中继器，立方阵列中继器和象限中继器。
<3>要列出为卷Name_Volume定义的中继器，请使用：
讯享网/gate/Name_Volume/repeaters/info
具体内容可参见下列网址
4、Placing a volume
使用子树定义几何体中卷的位置
/placement/
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