Dynamic bowtie filter for cone-beam/multi-slice CT.
Dynamic bowtie filter for cone-beam/multi-slice CT.
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DOI：
10.1371/journal.pone.0103054
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Wang G
中科院分区：
文献类型：
--
作者：
Liu F;Yang Q;Cong W;Wang G
患者前衰减器(“蝴蝶结滤光器”或“蝴蝶结”)被用来作为X射线相对于患者的角度的函数来调制进入的X射线束，以平衡探测器阵列上的光子通量。虽然目前的动态领结设计主要集中在扇形光束几何形状上，但在本研究中，我们提出了一种多切片/锥形光束几何形状的动态领结设计方法。所提出的3D动态领结是2D现有技术的扩展。3D蝴蝶结由充满重液体的高度衰减蝴蝶结(HB)和浸泡在HB液体中的弱衰减蝴蝶结(WB)组成。当视野(FOV)中没有物体时，HB的目标是探测器阵列上的平衡通量分布。WB补偿FOV中的对象，因此是该对象的缩小版本。WB与源旋转和患者平移同步地旋转和平移，从而在探测器阵列上保持总体通量平衡。首先，建立了椭圆水模不同扫描方式下的数学模型。然后，进行了数值模拟研究，比较了水体模和患者断面不打任何领带和有动态领带情况下的扫描模式的性能。在水模体的情况下，动态蝴蝶结可以使检测到的光子数相等。在实际应用中，动态蝴蝶结可以有效地缩小视场内检测信号的动态范围。此外，WB可以使用3D打印技术作为黄金标准进行个性化。我们已经将动态蝴蝶结的概念从2D扩展到3D，方法是使用高度衰减的液体，并移动被扫描对象的缩小比例的底片副本。我们的方法可以应用于减少辐射剂量和促进光子计数检测。
A pre-patient attenuator (“bowtie filter” or “bowtie”) is used to modulate an incoming x-ray beam as a function of the angle of the x-ray with respect to a patient to balance the photon flux on a detector array. While the current dynamic bowtie design is focused on fan-beam geometry, in this study we propose a methodology for dynamic bowtie design in multi-slice/cone-beam geometry. The proposed 3D dynamic bowtie is an extension of the 2D prior art. The 3D bowtie consists of a highly attenuating bowtie (HB) filled in with heavy liquid and a weakly attenuating bowtie (WB) immersed in the liquid of the HB. The HB targets a balanced flux distribution on a detector array when no object is in the field of view (FOV). The WB compensates for an object in the FOV, and hence is a scaled-down version of the object. The WB is rotated and translated in synchrony with the source rotation and patient translation so that the overall flux balance is maintained on the detector array. First, the mathematical models of different scanning modes are established for an elliptical water phantom. Then, a numerical simulation study is performed to compare the performance of the scanning modes in the cases of the water phantom and a patient cross-section without any bowtie and with a dynamic bowtie. The dynamic bowtie can equalize the numbers of detected photons in the case of the water phantom. In practical cases, the dynamic bowtie can effectively reduce the dynamic range of detected signals inside the FOV. Furthermore, the WB can be individualized using a 3D printing technique as the gold standard. We have extended the dynamic bowtie concept from 2D to 3D by using highly attenuating liquid and moving a scale-reduced negative copy of an object being scanned. Our methodology can be applied to reduce radiation dose and facilitate photon-counting detection.
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影响因子：
10.6
作者：
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通讯作者：
Zeng, GSL
影响因子：
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作者：
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DOI：
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发表时间：
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作者：
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通讯作者：
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影响因子：
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