Full breast digital mammography with an amorphous silicon-based flat panel detector: Physical characteristics of a clinical prototype
Full breast digital mammography with an amorphous silicon-based flat panel detector: Physical characteristics of a clinical prototype
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DOI：
10.1118/1.598895
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发表时间：
2000-03-01
期刊：
影响因子：
3.8
通讯作者：
Hendrick, RE
中科院分区：
文献类型：
--
作者：
Vedantham, S;Karellas, A;Hendrick, RE
研究了用于全乳房数字乳腺X射线摄影的临床原型非晶硅平板成像器的物理特性。该成像器采用了一个薄的铊掺杂碘化铯闪烁体上的非晶硅矩阵的探测器元件的像素间距为100 μ m。客观的标准，如调制传递函数（MTF），噪声功率谱，检测量子效率（DQE），和噪声等效量子用于此评估。在2、4和5次循环/mm时，预激MTF分别为0.73、0.42和0.28。利用28 kVp，Mo-Mo光谱束硬化与4.5厘米有机玻璃的当前原型的测量DQE是类似于55%，在接近零的空间频率在32.8 mR的曝光，并降低到类似于40%，在1.3 mR的低曝光。检测器元件的非均匀性和电子增益变化后，适当的校准和软件校正不显着。成像器的响应是线性的，并且在测试的曝光条件下没有表现出信号饱和。(C)2000年美国医学物理学家协会。[S0094-2405（00）01803-4]。
The physical characteristics of a clinical prototype amorphous silicon-based flat panel imager for full-breast digital mammography have been investigated. The imager employs a thin thallium doped CsI scintillator on an amorphous silicon matrix of detector elements with a pixel pitch of 100 mu m. Objective criteria such as modulation transfer function (MTF), noise power spectrum, detective quantum efficiency (DQE), and noise equivalent quanta were employed for this evaluation. The presampling MTF was found to be 0.73, 0.42, and 0.28 at 2, 4, and 5 cycles/mm, respectively. The measured DQE of the current prototype utilizing a 28 kVp, Mo-Mo spectrum beam hardened with 4.5 cm Lucite is similar to 55% at close to zero spatial frequency at an exposure of 32.8 mR, and decreases to similar to 40% at a low exposure of 1.3 mR. Detector element nonuniformity and electronic gain variations were not significant after appropriate calibration and software corrections. The response of the imager was linear and did not exhibit signal saturation under tested exposure conditions. (C) 2000 American Association of Physicists in Medicine. [S0094-2405(00)01803-4].