Article
Computer Science, Interdisciplinary Applications
Manuel Viermetz, Nikolai Gustschin, Clemens Schmid, Jakob Haeusele, Peter B. Noel, Roland Proksa, Stefan Loscher, Thomas Koehler, Franz Pfeiffer
Summary: Computed tomography (CT) is an important clinical diagnostics method, but its current limit to X-rays' attenuation contrast only can be expanded with dark-field imaging. Dark-field imaging offers access to more tissue properties, such as micro-structural texture or porosity. However, up-scaling this method to clinical scale is complex due to design constraints such as limited manufacturing technology and minimal modifications to the CT gantry. In this study, the advantages of an inverse interferometer and a triangular grating profile are discussed, making a compact and sensitive interferometer implementation feasible. The evaluation of the triangular grating profile reveals a deviation in the interference pattern compared to standard grating profiles, which must be taken into consideration in subsequent data processing.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2023)
Article
Computer Science, Interdisciplinary Applications
Manuel Viermetz, Nikolai Gustschin, Clemens Schmid, Jakob Haeusele, Bernhard Gleich, Bernhard Renger, Thomas Koehler, Franz Pfeiffer
Summary: X-ray computed tomography (CT) is an important imaging technique in clinical diagnostics. Dark-field CT, which provides additional microstructural information, has shown potential clinical value. In this paper, the performance of a prototype dark-field CT system is discussed, including the evaluation of the interferometer components and challenges related to integration into the CT gantry. The impact of the X-ray source and vibrations on the system are analyzed, and a beam hardening correction is introduced to enable quantitative dark-field imaging. The resolution and patient dose are also analyzed, and initial patient studies using the presented dark-field CT system are suggested.
IEEE TRANSACTIONS ON MEDICAL IMAGING
(2023)
Review
Engineering, Biomedical
Lina Felsner, Philipp Roser, Andreas Maier, Christian Riess
Summary: This study compared different methods to correct artifacts in tomographic reconstructions, finding that the iterative reconstruction algorithm, known operator network, and U-net all reduced specific artifacts but exhibited different noise behaviors.
INTERNATIONAL JOURNAL OF COMPUTER ASSISTED RADIOLOGY AND SURGERY
(2021)
Article
Instruments & Instrumentation
Masashi Kageyama, Kenichi Okajima, Minoru Maesawa, Masahiro Nonoguchi, Manabu Nonoguchi, Masaru Kuribayashi, Yukihiro Hara, Atsushi Momose
Summary: The study developed and tested a laboratory assembled X-ray phase CT system with high spatial and density resolution, which successfully distinguishes different materials. The system can also switch to another mode with a wider field of view.
JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Biomedical
Qisi Lin, Zhao Wu, Guibin Zan, Meng Huang, Zheng Dang, Lijiao Tian, Yong Guan, Gang Liu, Yalin Lu, Yangchao Tian
Summary: This article successfully extends the FOV of compact XTLI and achieves large field of view imaging at high energy by designing and developing an inverse XTLI coupled with a microarray anode-structured target source. Experimental results demonstrate the potential advantage of phase contrast mode in imaging lung tissue.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Multidisciplinary Sciences
Guibin Zan, Sheraz Gul, Jin Zhang, Wei Zhao, Sylvia Lewis, David J. Vine, Yijin Liu, Piero Pianetta, Wenbing Yun
Summary: The study developed a TLI system with MAAST source, offering high-resolution and tri-contrast X-ray imaging for biomedical applications. Tomography of Drum fish tooth revealed valuable complementary structural information using this method.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Proceedings Paper
Optics
Ryosuke Ueda, Koh Hashimoto, Hidekazu Takano, Mingjian Cai, Atsushi Momose
Summary: In this study, a three-wave interference model is utilized to reduce artifacts in phase tomography, along with a proposed new method. The presentation demonstrates the reduction of artifacts in phase tomography through the results shown.
DEVELOPMENTS IN X-RAY TOMOGRAPHY XIII
(2021)
Article
Optics
Yang Jun, Huang Jianheng, Shan Yuzheng, Lei Yaohu, Zong Fangke, Guo Jinchuan
Summary: In the past few decades, several methods for X-ray phase-contrast imaging have been developed, with the grating-based X-ray interferometer generating significant attention and progress. However, the small size of the absorption grating limits its use in clinical applications. To address this limitation, a dual phase grating interferometer is proposed, which allows for phase-contrast and dark-field imaging with a large field of view and high dose utilization. To calculate the sensitivity of the interferometer, a new sensitivity model based on the transverse fringe shift is proposed, providing theoretical support for optimizing the dual phase grating interferometer.
ACTA PHOTONICA SINICA
(2023)
Article
Instruments & Instrumentation
Chengxiang Wang, Richard Gordon
Summary: This study proposes a new algorithm for projection and back-projection to simplify computer tomography image reconstruction. The algorithm uses a reversible image rotation algorithm to calculate the projection and back-projection without interpolation. Experimental results show that the reconstructed image using this algorithm is close to the traditional method and easier to implement in computer code.
JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
Hidekazu Takano, Yanlin Wu, Tetsuo Samoto, Atsushi Taketani, Takaoki Takanashi, Chihiro Iwamoto, Yoshie Otake, Atsushi Momose
Summary: Neutron imaging based on a compact Talbot-Lau interferometer using the RIKEN accelerator-driven compact neutron source (RANS) was demonstrated. Differential phase and scattering images of metal rod samples were obtained, showing the feasibility of neutron phase imaging and the potential for nondestructive evaluation.
QUANTUM BEAM SCIENCE
(2022)
Article
Engineering, Chemical
Jun Zhao, YongChao Xiang, Cheng Fan
Summary: The traditional polishing method for the inner wall of a tube has limitations in tool size and geometric constraints. This paper proposes a new method called soft abrasive rotating jet polishing (SARJP) to overcome these limitations and optimize the polishing process. By combining the Taguchi method and response surface technique, the speed and quality of the optimization process were improved. Mathematical statistics and graph tools were used to assess the influence of various factors on the roughness of the inner wall of the tube.
Article
Geosciences, Multidisciplinary
Valeria Cigala, Ulrich Kueppers, Juan Jose Pena Fernandez, Donald B. Dingwell
Summary: Predicting explosive volcanic eruptions is challenging due to unclear correlation between eruptive features and subsurface conditions, slow progress in field investigation, and the dynamic nature of explosive events. Experimental investigations offer an opportunity to systematically study volcanic processes and quantify them.
BULLETIN OF VOLCANOLOGY
(2021)
