SedentexCT DI剂量指数模体由一组PMMA(聚甲基丙烯酸甲酯)板堆叠，形成用以模拟成人头部的圆柱体(直径160mm，密度1.20 1.20 ± 0.01 g/cm3)。
The SedentexCT DI dose index phantom comprises a stack of PMMA plates forming a cylinder representing the adult head (160 mm diameter, density 1.20 ± 0.01 g/cm3).

SedentexCT DI(剂量指数)型模体的探测系统可配合以下部件使用：
Several types of detector system are provided for:

• 电离室
ionization chambers
• 热释光探测器(TLDs)
thermoluminescent detectors (TLDs)  
• Gafchromic免冲洗胶片
gafchromic film
  

可互换堆叠的PMMA板包括：
Interchangeable stack of PMMA plates including:

• 四张电离室插板：含两张组22mm及两张44mm厚PMMA板，每张板上具有5个贯通小孔(直径26mm)形成的阵列。小孔用于插入电离室。该层插板在4个位置上标有定位刻度。
4 x Ionization chamber plates: 2 x 22mm and 2 x 44mm thick PMMA plates with an array of 5 through holes (26mm diameter) for the insertion of ionization chambers. Includes engraved scale in 4 positions.

• 一张热释光探测器(TLD)插板：一张22mm厚的PMMA板，板上均匀分布有37个孔(孔间隙为4mm正方形，1mm半角径)，形成用于插入热释光探测器(TLD)的阵列。该层插板在4个位置上标有定位刻度。
1 x TLD plate: A 22mm thick PMMA plate with an array of 37 holes (4mm squares, 1mm corner radii) uniformly pitched for the insertion of TLDs. Includes engraved scale in 4 positions.

• 一层胶片插板：一张22mm厚的PMMA板，板上具有0.5mm深的凹槽，用于放置Gafchromic免冲洗胶片。该层插板在4个位置上标有定位刻度。
1 x Film plate: A 22mm thick PMMA plate with a 0.5mm recess for the placement of gafchromic film. Includes engraved scale in 4 positions.
• 适配装置：提供3个适配装置(分别长22mm, 44mm及66mm)，以降低电离室直径(从26mm至13mm)。
Adapters: 3 adapters (length 22mm, 44mm and 66mm) are provided to reduce the ionization chamber diameter from 26mm to 13mm.
• 填充材料：包括一系列填充材料，这些填料可被插入任何未经使用的电离室通孔中。
Fillers: A range of fillers are included which can be inserted into any of the unused ionization chamber through holes.

*SedentexCT DI模体的设计生产符合: EC 第172:2012执行标准的有关规定 
Conforms to standards: EC No 172 : 2012