PURPOSE:To reduce the artifact of a CT image by calculating a low frequency component on two dimensions of a difference between a mean CT value and a CT value of each picture element with regard to each picture element, deriving a suitable function value to the low frequency component ...
比如:The strange mark on the X ray was an artifact caused by a problem with the machine.(X光片上的奇怪痕迹是机器故障造成的伪像。)。 二、artifact 在不同语境中的用法。 1. 在考古学和历史学语境中。 考古学家在描述挖掘出的古代物品时经常会用到“artifact”。例如:Archaeologists discovered a ...
Yan et al. [6] presented a reconstruction algorithm using a polychromatic X-ray beam and they were able to remove a substantial portion of beam hardening artifacts. There are several types of image noise that can affect the imaging process, but the ultimate source is the random, statistical ...
The invention discloses a suppression method and device for a grid artifact in an X-ray image. The method comprises the following steps: carrying out one-dimensional high-pass filtering to an original X-ray image in a direction vertical to a grid line of a grid of an original X-ray image...
The emitted x-ray beam has a span angle of 43°. The source has a variable focal spot size from 5 μm to 50 μm depending on the applied tube power. We have operated the micro-focus x-ray source in a continuous mode with a 1 mm-thick Al filter. We have used a ...
•Causes,appearancesandcorrections–Physicsrelatedartifacts与系统物理特性相关伪影–Detector-inducedartifacts探测器导致伪影–Artifactrelatedtox-raytube–Patient-inducedartifacts–Reconstructionbasedartifacts重建导致的伪影 Physicsrelatedartifacts与系统物理特性相关伪影 •Beam-hardeningartifact;射束硬化伪影 –Appearances表现...
•Overview概述–Definition定义–Typesofartifact伪影类型•Causes,appearancesandcorrections–Physicsrelatedartifacts与系统物理特性相关伪影––––Detector-inducedartifacts探测器导致伪影Artifactrelatedtox-raytubePatient-inducedartifactsReconstructionbasedartifacts重建导致的伪影 Physicsrelatedartifacts与系统物理特性相关伪影 ...
Compared to body tissues, metallic materials attenuate X-rays significantly and nonuniformly over the spectrum, leading to inconsistent X-ray projections. The mismatched projections will introduce severe streaking and shading artifacts in the reconstructed CT images, which significantly degrade the image ...
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FIBA: Frequency-Injection based Backdoor Attack in Medical Image Analysishazardfy/fiba • • CVPR 2022 However, designing a unified BA method that can be applied to various MIA systems is challenging due to the diversity of imaging modalities (e. g., X-Ray, CT, and MRI) and analysis ...