IBEX Virtual Anti-Scatter Grid Detector

IBEX Innovations（IBEX）在InnovateUK的一个项目中成功展示了其虚拟防散射滤线栅（VASG）概念在提高诊断质量和显著降低医用放射学检查中患者剂量方面的潜力。物理防散射滤线栅（ASG）广泛用于医用X射线成像，以降低到达探测器的不必要X射线散射水平，对于获得诊断质量图像至关重要，特别是在较厚的身体部位，如躯干、头部和胸部。然而，除了阻挡不需要的散射，物理ASG还吸收了很大一部分有用的直接X射线，并导致患者剂量增加2倍至8倍，以获得可接受的图像。相比之下，所提出的IBEX虚拟防散射网格（VASG），采用IBEX多吸收板（MAP）和先进的IBEX软件算法产生的材料数据，并使用它来反卷积散射的X射线，通过有效地利用更多可用的X射线光子来创建图像，而不是仅仅用物理ASG阻挡不必要的散射，VASG有望在显著降低患者剂量的情况下产生改善的对比度，同时进一步提高IBEX材料分类的灵敏度，VASG概念主要依赖于IBEX材料分类技术，该技术是在之前的InnovateUK DoP项目下成功开发的，并已在2015年7月完成的一个项目中证明有效。

IBEX Innovations (IBEX) has successfully demonstrated, in an InnovateUK PoC project, thepotential for its virtual anti-scatter grid (VASG) concept to improve diagnostic quality andsignificantly reduce patient dose in medical radiological examinationsPhysical anti-scatter grids (ASGs) are extensively used in medical X-ray imaging to reduce thelevels of unwanted X-ray scatter reaching the detector and are essential to achieve diagnosticquality images, especially on thicker body parts such as the torso, head and breast. However,as well as blocking unwanted scatter, physical ASGs also absorb a significant proportion ofuseful direct X-rays and result in patient doses being increased by between a factor of 2x and8x to achieve acceptable images.By contrast, the proposed IBEX Virtual Anti-Scatter Grid (VASG), takes materials datagenerated by the IBEX Multi Absorption Plate (MAP) and advanced IBEX softwarealgorithms and uses it to deconvolve the scattered X-ray component, utilising the scattered Xraydata to improve image contrast without the need for a physical ASG.By usefully employing more of the available X-ray photons to create an image instead of justblocking unwanted scatter with a physical ASG, the VASG is expected to generate improvedcontrast at significantly lower patient doses, whilst further improving the sensitivity of theIBEX materials classification, leading to further improvements in the diagnostic value ofradiographic examinations.The VASG concept relies fundamentally upon the IBEX materials classification technologysuccessfully developed under a previous InnovateUK DoP project, and has been shown towork in a PoC project which completed in July 2015.