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Journal of X-ray Science and Technology

Igor Mikhailov, Aleksey Baturin, Valery Kondratenko, Igor Kopilets, Anton Mikhailov
The characteristics of spectra obtained by monochromatization of a broadband spectrum using the effect of X-ray anomalous transmission (Bormann effect) have been experimentally studied. Optimization of the crystal thickness allows one to obtain the spectral band with a controlled width of ΔE/E = 1-5 10-3 and with a contrast of more than 250 with a peak reflectivity not less than 4% in the transmitted Bormann beam. It was found that due to the wave field compression, the width of the transmitted Bormann beam decreased three times as the thickness of the crystal increased...
September 23, 2016: Journal of X-ray Science and Technology
K Ghanbari, A Salar Elahi, M Ghoranneviss
The synchrotron radiation emitted by runaway electrons in fusion plasma provides information regarding the particle momentum and pitch-angles of the runaway electron population through the strong dependence of the synchrotron spectrum on these parameters. Information about the runaway density and its spatial distribution, as well as the time evolution of the above quantities, can also be deduced. On the other hand, control of radial electric filed and suggestion of the methods to reduce plasma turbulence are important issues in confinement process and particle transport in the tokamaks...
September 23, 2016: Journal of X-ray Science and Technology
Baodong Liu, Alexander Katsevich, Hengyong Yu
The interior problem, i.e. reconstruction from local truncated projections in computed tomography (CT), is common in practical applications. However, its solution is non-unique in a general unconstrained setting. To solve the interior problem uniquely and stably, in recent years both the prior knowledge- and compressive sensing (CS)-based methods have been developed. Those theoretically exact solutions for the interior problem are called interior tomography. Along this direction, we propose here a new CS-based method for the interior problem based on the curvelet transform...
September 9, 2016: Journal of X-ray Science and Technology
Azeez Omotayo, Idris Elbakri
OBJECTIVE: Iterative algorithms are gaining clinical acceptance in CT. We performed objective phantom-based image quality evaluation of five commercial iterative reconstruction algorithms available on four different multi-detector CT (MDCT) scanners at different dose levels as well as the conventional filtered back-projection (FBP) reconstruction. METHODS: Using the Catphan500 phantom, we evaluated image noise, contrast-to-noise ratio (CNR), modulation transfer function (MTF) and noise-power spectrum (NPS)...
September 9, 2016: Journal of X-ray Science and Technology
Toru Kano, Michihiko Koseki
BACKGROUND: Computed tomography (CT) is an established imaging technology primarily used as a non-invasive diagnostic tool that reconstructs axial images. However, significant problems with metal artifacts remain. A metal artifact is a strong radial noise in an image, which makes it difficult to diagnose patients and inspect products containing metal implants. Historically, studies related to metal artifact reduction used projection data, though the data is not typically saved after processing...
September 9, 2016: Journal of X-ray Science and Technology
M Ghoranneviss, S Shahidi, A Salar Elahi
In this research, the cotton fabrics were treated with nitrogen plasma for the clinical and anti-bacterial purposes. Turmeric was used a as a natural dye. Some part of both untreated and plasma treated samples was immersed in silver nitrate as a mordant before dyeing. Effect of plasma and silver nitrate on dye ability of cotton samples was compared and studied. Samples were analyzed with different experimental methods, such as scanning electron microscopy (SEM), Reflection spectro-photometry and antibacterial test...
September 9, 2016: Journal of X-ray Science and Technology
Chia-Chun Kuo, Ho-Chiao Chuang, Kuan-Ting Teng, Hsiao-Yu Hsu, Der-Chi Tien, Chih-Jen Wu, Shiu-Chen Jeng, Jeng-Fong Chiou
The purpose of this study was to develop an ultrasound image tracking algorithm (UITA) for extracting the exact displacement of internal organs caused by respiratory motion. The program can track organ displacements in real time, and analyze the displacement signals associated with organ displacements via a respiration compensating system (RCS). The ultrasound imaging system is noninvasive and has a high spatial resolution and a high frame rate (around 32 frames/s), which reduces the radiation doses that patients receive during computed tomography and X-ray observations...
September 9, 2016: Journal of X-ray Science and Technology
Zhijie He, Quanbang Qiao, Jun Li, Meiping Huang, Shouping Zhu, Liyu Huang
BACKGROUND: The CT image reconstruction algorithm based compressed sensing (CS) can be formulated as an optimization problem that minimizes the total-variation (TV) term constrained by the data fidelity and image nonnegativity. There are a lot of solutions to this problem, but the computational efficiency and reconstructed image quality of these methods still need to be improved. OBJECTIVE: To investigate a faster and more accurate mathematical algorithm to settle TV term minimization problem of CT image reconstruction...
September 3, 2016: Journal of X-ray Science and Technology
Wuteng Cao, Fangqian Li, Jiaying Gong, Dechao Liu, Yanhong Deng, Liang Kang, Zhiyang Zhou
To investigate the efficacy of liver acquisition with acceleration volume acquisition (LAVA) gadolinium-enhanced magnetic resonance (MR) sequences and to assess its added accuracy in diagnosing local recurrence (LR) of rectal cancer with conventional T2-weighted fast spin echo (FSE) sequences. Pelvic MRI, including T2-weighted FSE sequences, gadolinium-enhanced sequences of LAVA and T1-weighted FSE with fat suppression, was performed on 225 patients with postoperative rectal cancer. Two readers evaluated the presence of LR according to "T2" (T2 sequences only), "T2 + LAVA-Gad" (LAVA and T2 imaging), and "T2 + T1-fs-Gad" (T1 fat suppression-enhanced sequence with T2 images)...
September 3, 2016: Journal of X-ray Science and Technology
Xiumei Tian, Dong Zeng, Shanli Zhang, Jing Huang, Hua Zhang, Ji He, Lijun Lu, Weiwen Xi, Jianhua Ma, Zhaoying Bian
Dynamic cerebral perfusion x-ray computed tomography (PCT) imaging has been advocated to quantitatively and qualitatively assess hemodynamic parameters in the diagnosis of acute stroke or chronic cerebrovascular diseases. However, the associated radiation dose is a significant concern to patients due to its dynamic scan protocol. To address this issue, in this paper we propose an image restoration method by utilizing coupled dictionary learning (CDL) scheme to yield clinically acceptable PCT images with low-dose data acquisition...
September 3, 2016: Journal of X-ray Science and Technology
Mianyi Chen, Qingsong Yang, Wenxiang Cong, Biao Wei, Ge Wang
The Precision of geometric parameters is the key requirement for grating-based phase-contrast CT and attenuation-based CT in cone-beam geometry. By extending our fan-beam geometric calibration work via Locally Linear Embedding (LLE) into the cone-beam case, here we calibrate the geometric parameters of our in-house phase-contrast CT system with attenuation projection data. Numerical and experimental studies show that the LLE-based calibration method is feasible to calibrate 8 parameters of the cone-beam geometry that improves reconstruction quality significantly...
September 3, 2016: Journal of X-ray Science and Technology
Pei-Hua Tang, Ben-Jun Du, Xiang-Ming Fang, Xiao-Yun Hu, Ping-Yan Qian, Quan-Sheng Gao
PURPOSE: To assess the application value of submillisievert coronary CT angiography (CCTA) in patients with a high heart rate (HR) acquired with adaptive prospective ECG-triggered sequence acquisition and iterative reconstruction on the secondary generation dual-source CT. MATERIALS AND METHODS: A total of 120 consecutive high-HR patients suspected with coronary artery disease underwent CCTA and invasive coronary angiography (ICA) within two weeks. Patients were randomly assigned into three groups: group A (n = 40), where the patients underwent retrospectively ECG-triggered acquisition CCTA at 100 kVp; group B (n = 40), where the patients received adaptive prospective ECG-triggered sequence acquisition at 100 kVp; and group C (n = 40), where the patients performed adaptive prospective ECG-triggered sequence acquisition at 80 kVp with iterative reconstruction...
September 3, 2016: Journal of X-ray Science and Technology
E E Libin, S V Chakhlov, D Trinca
A new mathematical appoach using the inverse Radon equation for restoration of images in problems of linear two-dimensional x-ray tomography is formulated. In this approach, Fourier transformation is not used, and it gives the chance to create the practical computing algorithms having more reliable mathematical substantiation. Results of software implementation show that for especially for low number of projections, the described approach performs better than standard X-ray tomographic reconstruction algorithms...
September 3, 2016: Journal of X-ray Science and Technology
Cuixiang Pei, Wenjing Wu, Mitsuru Ueaska
The use of portable and high-energy X-ray system can provide a very promising approach for on-site nondestructive inspection of inner steel reinforcement of concrete structures. However, the noise properties and contrast of the radiographic images for thick concrete structures do often not meet the demands. To enhance the images, we present a simple and effective method for noise reduction based on a combined curvelet-wavelet transform and local contrast enhancement based on neighborhood operation. To investigate the performance of this method for our X-ray system, we have performed several experiments with using simulated and experimental data...
July 27, 2016: Journal of X-ray Science and Technology
Navnina Bhatia, David Tisseur, Solene Valton, Jean Michel Létang
Due to the increased cone beam coverage and the introduction of flat panel detector, the size of X-ray illumination fields has grown dramatically in Cone Beam Computed Tomography (CBCT), causing an increase in scatter radiation. Existing reconstruction algorithms do not model the scatter radiation, so scatter artifacts appear in the reconstruction images. The contribution of scattering of photons inside the detector itself becomes prominent and challenging in case of X-ray source of high energy (over a few 100 keV) which is used in typical industrial Non Destructive Testing (NDT)...
October 6, 2016: Journal of X-ray Science and Technology
(no author information available yet)
No abstract text is available yet for this article.
October 6, 2016: Journal of X-ray Science and Technology
Yaming Li, Jicheng Sun, Yuanyuan Zhang, Wenyang Li, Bo Hu, Jinlin Song
Dental cone beam computed tomography (CBCT) is a new approach in diagnosis and predication of various dental diseases, including trauma, congenital defects, tumors and inflammatory. In this study, we reported the outcome of CBCT for a complicated case of malocclusion, accompanied with tooth loss and periodontitis. A combined application of CBCT with 3D-static images and rotated reconstruction images is reviewed as a systematic model in diagnosis, treatment and progonsis of a complex malocclusion.
October 6, 2016: Journal of X-ray Science and Technology
Liang Chen, Xiaoyong Zeng, Shuang Li, Chengliang Gong, Ejun Peng, Bolin Wu, Wei Zhang, Yuanyuan Zhang
Adrenocortical carcinoma (ACC) is an extremely rare disease caused by a cancerous growth in the adrenal cortex. Although most of adrenal tumors are benign, the functional ACC is malignant resulting in endocrine dysfunction and necessitates surgical removal. Retroperitoneal laparoscope adrenalectomy is often used to perform adrenal gland surgery. Here, we reported a case of huge ACC with the size of 6.8 cm × 5.2 cm. To achieve better surgical outcome, we integrated 3D reconstructed CT images into a dynamic video for preoperative planning and intraoperative guiding to resect the diseased adrenal gland completely without neighbor organ's injury and surgery complications...
October 6, 2016: Journal of X-ray Science and Technology
Jun Deng, Xiongbing Lu, Ying Liu
Ectopic insertion of the ureter in the genitourinary tract is a rare congenital disorder, usually associated with ureteral duplication. Identification of the insertion open is critical for ureteric re-implantation. However, the challenge in the diagnosis of ectopic insertion of the ureter usually is to identify its insertion, particularly when the affected ureter is not dilated. Multi-detector computed tomography (MDCT) urography with nonionic iodinated contrast media delineates the ureteric course in the normal functioning kidney in the excretory phase [1]...
October 6, 2016: Journal of X-ray Science and Technology
Deying Zhang, Guangping Zeng, Yan Zhang, Xing Liu, Shengde Wu, Yi Hua, Feng Liu, Peng Lu, Chuan Feng, Bin Qin, Jinhua Cai, Yuanyuan Zhang, Dawei He, Tao Lin, Guanghui Wei
No abstract text is available yet for this article.
October 6, 2016: Journal of X-ray Science and Technology
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