Effect of beam quality and readout direction in the edge profile on the modulation transfer function of photostimulable phosphor systems via the edge method.
Effect of beam quality and readout direction in the edge profile on the modulation transfer function of photostimulable phosphor systems via the edge method.
复制标题
通过边缘方法，边缘轮廓中的光束质量和读出方向对光激励荧光体系统的调制传递函数的影响。
DOI：
10.1117/1.jmi.8.4.043501
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yoshiura K.
中科院分区：
文献类型：
--
作者：
Takarabe S;Kuramoto T;Shibayama Y;Tsuru H;Tatsumi M;Kato T;Okamura K;Yoshiura K.
目的：本研究的目的是调查的影响（一）在预采样调制传递函数（MTF）使用的边缘方法和（ii）的边缘轮廓的读出方向的光束质量的差异为photostimulable磷光体（PSP）system.Approach：国际电工委员会（IEC）定义了一种技术，使用“辐射质量的基础上，由一个加铝过滤器的幻影”（RQA）。使用管电压为50 kV和9.7 mm附加铝过滤的通用射线照相系统，以使X射线符合IEC规定的光束质量定义RQA 3。此外，我们采用了两种不同的光束，管电压为60和70千伏，使用牙科X射线机。在读出方向从低到高曝光区域测量MTF，反之亦然，相对于PSP system.Results的扫描和亚扫描方向：在60和70 kV之间的所有方向的50%MTF值的差异平均小于0.05。对于每个方向，RQA 3的50%MTF平均比60 kV的值低0.2。对于所有的光束质量，从低到高的曝光regions.Conclusions读出方向上测得的MTF之间没有差异，反之亦然：MTF，使用牙科X射线单元测量，不受管电压的影响，他们略高于使用RQA 3测量。此外，MTF不受边缘轮廓的读出方向的差异的影响。
Purpose:The objective of this study was to investigate the effects of (i) the difference in the beam qualities on the presampled modulation transfer function (MTF) using the edge method and (ii) the readout direction of the edge profile for the photostimulable phosphor (PSP) system.Approach:The International Electrotechnical Commission (IEC) defined a technique using the “radiation qualities based on a phantom made up of an aluminum added filter” (RQA). A general radiographic system with a tube voltage of 50 kV and 9.7 mm of additional aluminum filtration was used to conform the x-ray to the IEC-specified beam quality definition RQA3. Additionally, we employed two different beams with tube voltages of 60 and 70 kV using a dental x-ray unit. The MTF was measured in the readout direction from low-to-high exposure regions and vice versa with respect to the scanning and subscanning directions of the PSP system.Results:The difference in the 50%MTF value for all directions between 60 and 70 kV averaged less than 0.05. The 50%MTF of RQA3 was on average 0.2 lower than the value for 60 kV for each direction. For all beam qualities, no difference was observed between the MTFs measured in the readout direction from the low-to-high exposure regions and vice versa.Conclusions:The MTFs, measured using the dental x-ray unit, were unaffected by the tube voltage, and they were slightly higher than those measured using the RQA3. Furthermore, the MTF was unaffected by the differences in the readout directions of the edge profile.