Clinically important characteristics of maximum-likelihood reconstruction.
Clinically important characteristics of maximum-likelihood reconstruction.
复制标题
最大似然重建的临床重要特征。
DOI：
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发表时间：
1992
影响因子：
9.3
通讯作者：
J. Wallis
中科院分区：
文献类型：
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作者：
T. Miller;J. Wallis
采集Jaszczak杆体模、单层霍夫曼脑体模和均匀水浴的SPECT图像。模拟嘈杂的酒吧幻影结合深度相关的衰减和模糊的产生和模拟与深度无关的衰减和模糊，是在PET的情况下。在迭代最大似然重建之后，使用高斯滤波器进行正则化。虽然在大约10次迭代中实现了衰减校正，但是通过条形模拟中的对比度和通过对真实的数据的目视检查来量化的SPECT重建中的空间分辨率是高度不均匀的，在中心处最差，并且朝向外围改善。当应用保持恒定信噪比的正则化时，图像分辨率继续改善，远远超过50次迭代。模拟PET数据中的对比度也随着迭代次数的增加而提高，但PET数据在所有迭代次数下均显示出贯穿轴向切片的均匀对比度。
SPECT images of a Jaszczak rod phantom, a single-slice Hoffman brain phantom and a uniform water-bath were acquired. Simulated noisy bar phantoms incorporating depth-dependent attenuation and blur were produced and compared to simulations with depth-independent attenuation and blur, as is the case in PET. Following iterative maximum-likelihood reconstruction, regularization was performed with use of Gaussian filters. While correction for attenuation is achieved in approximately 10 iterations, spatial resolution in the SPECT reconstructions, quantified by contrast in the bar simulations and by visual inspection of the real data, was highly nonuniform, being poorest at the center and improving toward the periphery. Image resolution continued to improve well beyond 50 iterations when regularization was applied that maintained a constant signal-to-noise ratio. Contrast in the simulated PET data also improved with increasing iterations, but the PET data showed uniform contrast throughout the transaxial slices at all numbers of iterations.
DOI：
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发表时间：
1989-04
期刊：
Journal of nuclear medicine : official publication, Society of Nuclear Medicine
影响因子：
--
作者：
Benjamin M. W. Tsui;G. T. Gullberg;E. Edgerton;J. Ballard;J. Perry;W. H. McCartney;J. Berg
通讯作者：
Benjamin M. W. Tsui;G. T. Gullberg;E. Edgerton;J. Ballard;J. Perry;W. H. McCartney;J. Berg