نتایج جستجو برای: non uniformity test
تعداد نتایج: 2036396 فیلتر نتایج به سال:
Ranked set sampling (RSS) is known to be superior to the traditional simple random sampling (SRS) in the sense that it often leads to more efficient inference procedures. Basic version of RSS has been extensively modified to come up with schemes resulting in more accurate estimators of the population attributes. Multistage ranked set sampling (MSRSS) is such a variation surpassing RSS. Entropy ...
This paper describes an industrial magnetic resonance multiple imaging (MRMI) system that measures nuclear magnetic resonance of several kinds of nuclei simultaneously. We use a new principle of X-ray CT. Then we reconstruct distribution images of nuclear magnetic resonance (NMR) without using usual gradient coils. We propose the construction of hardware with un-uniformity magnetic field, and a...
The aim of this paper is to introduce and investigate α∗-uniformity on a nonempty set X using α∗-covers of X in L-fuzzy set theory. Equivalent conditions for α∗-uniformity and basis to α∗-uniformity, respectively, are obtained. The topology generated by α∗-uniformity, called α∗-topology, is also given. Various examples of α∗-uniformity on X are given and the α∗-topology induced by them are also...
Intrinsic flood field uniformity is a fundamental quality control test that is considered as prerequisite for performing clinical routine exams using the gamma camera. Every gamma camera vendor provides recommended geometrical and physical parameters that should be followed while performing this test. Conventional methods using NEMA recommended parameters also can be used as well. The aim of th...
Background: Due to the small size of the beamlets in IMRT (intensity modulated radiotherapy), physical penumbra is one of the important dosimetric parameters and small changes in the penumbra have a notable impact on the results. The physical penumbra width is defined as the lateral distance between two specified isodose curves at a specified depth of phantom. In this study, after demonstrating...
introduction: one of the major causes of image non-uniformity in mri is due to the existence of non-homogeneity in rf receive and transmit. this can be the most effective source of error in quantitative studies in mri imaging. part of this non-homogeneity demonstrates the characteristics of rf coil and part of it is due to the interaction of rf field with the material being imaged...
Measures of structural brain change based on longitudinal MR imaging are increasingly important but can be degraded by intensity non-uniformity. This non-uniformity can be more pronounced at higher field strengths, or when using multichannel receiver coils. We assessed the ability of the non-parametric non-uniform intensity normalization (N3) technique to correct non-uniformity in 72 volumetric...
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