369 Study of window function and low contrast resolution in X-ray CT
نویسندگان
چکیده
منابع مشابه
The effect of focal spot size on the spatial resolution of variable resolution X-ray CT scanner
Background: A variable resolution X-ray (VRX) CT scanner provides a great increase in the spatial resolution. In VRX CT scanners, the spatial resolution of the system and its field of view (FOV) can be changed according to the object size. One of the main factors that limit the spatial resolution of VRX CT scanner is the effect of the X-ray focal spot. Materials and Methods: A theoreti...
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During the last years, a number of novel X-ray imaging and data processing methods have been developed. This work gives an overview of some recent CT-developments: 1) High resolution CT: State of the art laboratory CT-systems are able to reach resolutions down to 0.7 μm (or even lower) and voxels sizes down to 50 nm. Several applications of high-resolution CT are presented and discussed. 2) Qua...
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It is demonstrated that standard in-house protein crystal X-ray diffraction apparatus can be used to measure very low resolution reflections with only a few modifications. The apparatus and modifications are described in detail and tested on two different macromolecular crystal samples: lysozyme and the 30S ribosomal subunit. Contrast-variation measurements on tetragonal hen egg-white lysozyme ...
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When scanning weakly attenuating samples using an X-ray tube with a very small focal spot size, the acquired projections not only contain absorption contrast, but also phase contrast due to refraction of the X-rays. Although the resulting edge enhancement can be beneficial in radiography, the tomographic reconstruction of such mixed projections using a conventional algorithm yields cross-sectio...
متن کاملthe effect of focal spot size on the spatial resolution of variable resolution x-ray ct scanner
background: a variable resolution x-ray (vrx) ct scanner provides a great increase in the spatial resolution. in vrx ct scanners, the spatial resolution of the system and its field of view (fov) can be changed according to the object size. one of the main factors that limit the spatial resolution of vrx ct scanner is the effect of the x-ray focal spot. materials and methods: a theoretical study...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1997
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001356212