DEVELOPMENT OF A NOVEL W-PG LAMINATE X-RAY TARGET WITH IMPROVED FOCAL SPOT POWER DENSITY

摘要 在X射线成像中，焦斑功率密度限制了图像分辨率的进一步提高， 成像速度钨（W）的导热性限制了最大功率和最小 X射线源中允许的焦点尺寸。退火热解石墨（PG）具有热稳定性， 在其a-b晶面中的电导率比W高约10倍，但不适合用作X射线 源靶单独由于其低原子序数。我们将设计和开发一种新型的W-PG层压靶 这利用了两种材料的优点并显著地提高了X射线源焦斑功率密度。 因此，我们提出了本研究的两个具体目标：1）开发W-PG层压靶， 化学气相沉积（CVD）; 2）W-PG层压靶的评价和优化。通过 这项为期两年的研究将开发一种新的阳极制造工艺， 性能X射线源。

ABSTRACT In x-ray imaging, the focal spot power density constrains further improvement of image resolution and imaging speed. The thermal conductivity of tungsten (W) limits the maximum power and minimum dimension of the focal spot allowed in x-ray sources. Annealed Pyrolytic Graphite (PG) has a thermal conductivity about 10 times higher than W in its a-b crystalline plane, but unsuitable to be used as x-ray source target alone due to its low atomic number. We will design and develop a novel W-PG laminate target that takes advantages of both materials and significantly improve x-ray source focal spot power density. Hereby, we propose two specific aims in this study: 1) Development of W-PG laminate target using chemical vapor deposition (CVD); 2) Evaluation and optimization of W-PG laminate target. Through the two-year study, a new anode fabrication process will be developed, which can be used to produce high performance x-ray sources.