X-ray spectral measurements for tungsten-anode from 20 to 49 kVp on a digital breast tomosynthesis system.
X-ray spectral measurements for tungsten-anode from 20 to 49 kVp on a digital breast tomosynthesis system.
复制标题
在数字乳腺断层合成系统上对 20 至 49 kVp 的钨阳极进行 X 射线光谱测量。
DOI：
10.1118/1.4719958
复制
发表时间：
2012
期刊：
影响因子：
3.8
通讯作者：
Bob Liu
中科院分区：
文献类型：
--
作者：
Da Zhang;Xinhua Li;Bob Liu
目的
本文介绍了钨靶数字乳腺断层合成摄影（DBT）系统的新光谱测量，包括43-49 kVp的光谱。
方法
使用基于CdTe的光谱仪从Selenia Dimensions DBT系统的管端口直接测量20-49 kVp的原始X射线光谱。采用了两种准直配置：一种是直径为25 μm和200 μm的两个钨针孔，另一种是直径为25 μm的单个针孔，用于采集焦斑和焦斑及其附近的光谱。剥离校正应用于测量的光谱，以补偿由于逃逸事件的失真。将测量的光谱与TASMIP模型的现有乳腺摄影光谱在每次曝光的光子注量、光谱成分和半值层（HVL）方面进行比较。HVL由具有0.7 mm铝的数值过滤的光谱计算，并与使用W/Al（靶-过滤器）组合的DBT系统上的实际测量值进行比较，在光束中没有桨。
结果
来自双针孔配置的光谱，其中接收孔径指向焦点，比单针孔光谱更硬，其中包括初级和离焦辐射。在0.04 mm铝内，单针孔装置计算的HVL与测量的HVL一致，而双针孔装置的HVL值比单针孔HVL大至多0.1 mm铝。来自单针孔设置的光谱与TASMIP乳腺摄影光谱一致，并且与临床目的更相关。
结论
这些光谱数据将为钨靶DBT系统的进一步研究提供参考。
PURPOSE
This paper presents new spectral measurements of a tungsten-target digital breast tomosynthesis (DBT) system, including spectra of 43-49 kVp.
METHODS
Raw x-ray spectra of 20-49 kVp were directly measured from the tube port of a Selenia Dimensions DBT system using a CdTe based spectrometer. Two configurations of collimation were employed: one with two tungsten pinholes of 25 μm and 200 μm diameters, and the other with a single pinhole of 25 μm diameter, for acquiring spectra from the focal spot and from the focal spot as well as its vicinity. Stripping correction was applied to the measured spectra to compensate distortions due to escape events. The measured spectra were compared with the existing mammographic spectra of the TASMIP model in terms of photon fluence per exposure, spectral components, and half-value layer (HVL). HVLs were calculated from the spectra with a numerical filtration of 0.7 mm aluminum and were compared against actual measurements on the DBT system using W/Al (target-filter) combination, without paddle in the beam.
RESULTS
The spectra from the double-pinhole configuration, in which the acceptance aperture pointed right at the focal spot, were harder than the single-pinhole spectra which include both primary and off-focus radiation. HVL calculated from the single-pinhole setup agreed with the measured HVL within 0.04 mm aluminum, while the HVL values from the double-pinhole setup were larger than the single-pinhole HVL by at most 0.1 mm aluminum. The spectra from single-pinhole setup agreed well with the TASMIP mammographic spectra, and are more relevant for clinical purpose.
CONCLUSIONS
The spectra data would be useful for future research on DBT system with tungsten targets.
双能乳房X线照相术定量乳房密度：实验可行性研究。
影响因子：
3.8
作者：
Ducote,JustinL;Molloi,Sabee
通讯作者：
Molloi,Sabee
影响因子：
3.8
作者：
Laidevant, Aurelie D.;Malkov, Serghei;Shepherd, John A.
通讯作者：
Shepherd, John A.
影响因子：
19.7
作者：
WU, XZ;BARNES, GT;TUCKER, DM
通讯作者：
TUCKER, DM