SHAPE ESTIMATION OF BOWTIE FILTERS BASED ON THE LUMINESCENCE FROM POLYETHYLENE TEREPHTHALATE RESIN BY X-RAY IRRADIATION
SHAPE ESTIMATION OF BOWTIE FILTERS BASED ON THE LUMINESCENCE FROM POLYETHYLENE TEREPHTHALATE RESIN BY X-RAY IRRADIATION
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基于聚对苯二甲酸乙二醇酯树脂 X 射线辐射发光的蝶形滤波器形状估计
DOI：
10.1093/rpd/ncz031
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发表时间：
2019
影响因子：
1
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Yamauchi-Kawaura;C.;Fujii;K.;Yamauchi;M.;Yamamoto;S.;Kozuka;M.;Ohzawa;N.;Suga;N. and Ito;N.
在这项研究中，我们设计了一种新的方法，通过在计算机断层扫描（CT）扫描仪中x射线照射下，从聚对苯二甲酸乙二醇酯（PET）树脂成像发光来估计领结过滤器的形状。利用电荷耦合器件相机对PET树脂在领结滤光片厚度下的发光分布进行了成像。假设领结滤波器的材料为铝（Al），根据领结滤波器的厚度，从铝衰减曲线与角相关的亮度衰减曲线的相关性估计领结滤波器的形状。使用直径分别为16 cm和32 cm的头部和身体PMMA模型进行了基于预估领结过滤器形状的剂量模拟。发光成像法基于领结滤光片形状的头部和身体加权CT剂量指数（CTDIw）模拟值与剂量计测量值吻合在~9%以内。
In this study, we devised a novel method estimating the bowtie filter shapes by imaging luminescence from a polyethylene terephthalate (PET) resin with X-ray irradiation in a computed tomography (CT) scanner. The luminescence distribution of the PET resin corresponding to the thickness of bowtie filter was imaged using a charge-coupled device camera. On the assumption that the material of bowtie filter is aluminium (Al), the shape of bowtie filters was estimated from the correlation between Al attenuation curves and the angular-dependent luminance attenuation profiles according to the thickness of bowtie filters. Dose simulations based on the estimated bowtie filter shapes were performed using head and body PMMA phantoms with 16 and 32 cm in diameter. The simulated values of head and body weighted CT dose index (CTDIw) based on bowtie filter shape by the luminescence imaging method agreed within ~9% with the measured values by a dosemeter.