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Journal of X-ray Science and Technology

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https://www.readbyqxmd.com/read/30412517/safety-evaluation-of-mobile-x-ray-equipment-using-super-capacitor
#1
Young-Pyo Kim, Yong-Pil Park, Min-Woo Cheon
In this study, we designed mobile X-ray equipment that generates high-power X-rays, using an internal power source by means of a super-capacitor, and evaluated its safety. The proposed X-ray equipment uses the charging voltage of a battery to store high density energy, supplementing the electric charge of the super-capacitor, which can instantly release a large amount of energy. Further, pulse frequency modulation was applied to produce high voltage and thereby improve energy efficiency. The developed mobile X-ray equipment enables to generate an output of 30 kW and, therefore, can be applied to many diagnostic fields...
November 8, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30412516/morphological-analysis-of-blood-vessels-near-lung-tumors-using-3-d-quantitative-ct
#2
Yan Li, Yongliang Dai, Nan Yu, Xiaoyi Duan, Weishan Zhang, Youmin Guo, Jiansheng Wang
BACKGROUND: Improved visualization of lung cancer-associated vessels is vital. OBJECTIVE: To evaluate the efficacy of 3-D quantitative CT in lung cancer-associated pulmonary vessel assessment. METHODS: Vascular CT changes were assessed visually and using FACT-Digital lung TM software (n = 162 patients, 178 controls). The total number of pulmonary vessels (TNV) and mean lumen area of pulmonary vessels (MAV) vertical to cross-sections of fifth/sixth-generation bronchioles were measured...
November 8, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30400126/performance-of-the-sinogram-based-iterative-reconstruction-in-sparse-view-x-ray-computed-tomography
#3
Dragos Trinca, Eduard Libin
Performing X-ray computed tomography (CT) examinations with less radiation has recently received increasing interest: in medical imaging this means less (potentially harmful) radiation for the patient; in non-destructive testing of materials/objects such as testing jet engines, the reduction of the number of projection angles (which for large objects is in general high) leads to a substantial decreasing of the experiment time. In the experiment, less radiation is usually achieved by either (1) reducing the radiation dose used at each projection angle or (2) using sparse view X-ray CT, which means significantly less projection angles are used during the examination...
October 30, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30400125/collision-avoiding-imaging-trajectories-for-linac-mounted-cone-beam-ct
#4
Andrew M Davis, Erik A Pearson, Xiaochuan Pan, Charles A Pelizzari, Hania Al-Hallaq
BACKGROUND: Some patients cannot be imaged with cone-beam CT for image-guided radiation therapy because their size, pose, or fixation devices cause collisions with the machine. OBJECTIVE: To investigate imaging trajectories that avoid such collisions by using virtual isocenter and variable magnification during acquisition while yielding comparable image quality. METHODS: The machine components most likely to collide are the gantry and kV detector...
October 30, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30373997/a-study-of-the-mr-imaging-manifestations-with-injection-of-sedative-at-the-buttocks-in-pediatric-patients
#5
Xiaobo Li, Liuqing Jiang, Benhua Xu, Dairong Cao, Yu Lei, Biying Liu, Sicong Li
BACKGROUND: During the MRI examination, pediatric patients sleep under the sedation so that the image artifacts caused by the patient motion could be minimized. However, the sedative injection at the buttocks might cause a difficulty in the diagnosis of the buttock diseases using the MRI manifestations. OBJECTIVE: This study aims to explore the imaging characteristics of MR for the pediatric patients with the sedative injected at the buttocks in order to correctly diagnose the diseases...
October 25, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30347634/on-the-relevance-of-denoising-and-artefact-reduction-in-3d-segmentation-and-classification-within-complex-computed-tomography-imagery
#6
Andre Mouton, P Toby Breckon
We evaluate the impact of denoising and Metal Artefact Reduction (MAR) on 3D object segmentation and classification in low-resolution, cluttered dual-energy Computed Tomography (CT). To this end, we present a novel 3D materials-based segmentation technique based on the Dual-Energy Index (DEI) to automatically generate subvolumes for classification. Subvolume classification is performed using an extension of Extremely Randomised Clustering (ERC) forest codebooks, constructed using dense feature-point sampling and multiscale Density Histogram (DH) descriptors...
October 16, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30320599/percutaneous-transvenous-retrieval-of-fractured-catheter-in-cancer-patients-receiving-chemotherapy
#7
Ketong Wu, Haiyang Lai, Yang Liu, Bo Zhang
OBJECTIVE: To explore the clinical efficacy and safety of percutaneous transvenous retrieval of intravascular fractured catheter and to evaluate the possible reasons and final results in cancer patients. METHODS: A dataset of 19 patients was used. Percutaneous transvenous retrieval of intravascular fractured catheter was performed in each patients. Clinical data was retrospectively analyzed with respect to the efficacy, safety and outcome, and chest radiography was performed to verify that no catheter fragments were left...
October 6, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30248067/experimental-study-to-optimize-configurations-of-pcd-spectral-ct
#8
Xiaoyue Guo, Li Zhang, Yuxiang Xing
BACKGROUND: High dose efficiency of photon counting detector based spectral CT (PCD-SCT) and its value in some clinical diagnosis have been well acknowledged. However, it has not been widely adopted in practical use for medical diagnosis and security inspection. OBJECTIVE: To evaluate the influence on PCD-SCT from multiple aspects including the number of energy channels, k-edge materials, energy thresholding, basis functions in spectral information decomposition, and the combined optimal setting for these parameters and configurations...
September 15, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30223423/comparison-of-medical-image-classification-accuracy-among-three-machine-learning-methods
#9
Tomoko Maruyama, Norio Hayashi, Yusuke Sato, Shingo Hyuga, Yuta Wakayama, Haruyuki Watanabe, Akio Ogura, Toshihiro Ogura
BACKGROUND: Low-quality medical images may influence the accuracy of the machine learning process. OBJECTIVE: This study was undertaken to compare accuracy of medical image classification among machine learning methods, as classification is a basic aspect of clinical image inspection. METHODS: Three types of machine learning methods were used, which include Support Vector Machine (SVM), Artificial Neural Network (ANN), and Convolution Neural Network (CNN)...
September 11, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30223422/a-correlative-study-of-myocardial-infarction-scar-characteristics-by-de-mr-and-the-lown-s-classification-of-ventricular-premature-beats
#10
Xinxiang Zhao, Renhui Cai, Lin Sun, Liping He, Wenjing Sun, Xiaohai Ma, Linsheng Song
OBJECTIVE: Correlation between myocardial infarction (MI) scar by cardiac magnetic resonance and the Lown's classification of ventricular premature beats (VPBs) is poorly understood. This study aims to investigate the correlation between the MI scar characteristics by delayed-enhancement magnetic resonance imaging (DE-MRI) and the Lown's classification of VPBs. METHODS: Sixty-five patients, in the convalescence stage and consolidation phase of MI, were included in this retrospective study...
September 11, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30223421/dynamic-magnetic-resonance-imaging-of-carbogen-challenge-on-awake-rabbit-brain-at-1-5t
#11
Po-Chou Chen, Kuan-Hsiung Shoa, Jo-Chi Jao, Chia-Chi Hsiao
BACKGROUND: Anesthesia may alter the cellular components contributing to the magnetic resonance imaging (MRI) signal intensities. Developing awake animal models to evaluate cerebral function has grown in importance. OBJECTIVE: To investigate a noninvasive strategy for dynamic MRI (dMRI) of awake rabbits during carbogen challenge. METHODS: A nonmetallic assistive device with a self-adhering wrap secure procedure was developed for the head fixation of awake rabbits...
September 11, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30198882/a-clinical-application-of-dynamic-contrast-enhanced-ct-dce-ct-in-patients-with-variously-differentiated-breast-ductal-carcinoma
#12
Zhong-Bin Ma, Fang-Qing Ge, Wei-Xia Wang, Zong-Qiong Sun
PURPOSE: To explore the hemodynamic characteristics of variously differentiated breast ductal carcinoma (BDC) using the dynamic contrast-enhanced CT (DCE-CT) based CT perfusion imaging (CTPI), including the specific perfusion parameter values, and to identify potential clinical applications in the cell differentiation degree of BDC. MATERIALS AND METHODS: Forty patients with breast ductal carcinoma confirmed by needle puncture biopsy were studied prospectively using CTPI on a 64-slice spiral CT scanner...
September 3, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30149492/a-new-adaptive-weighted-total-variation-sparse-view-computed-tomography-image-reconstruction-with-local-improved-gradient-information
#13
Yuanjun Wang, Zeyao Qi
Inspired by the compressed sensing (CS) theory, introducing priori information of sparse image into sparse-view reconstruction algorithm of computed tomography (CT) can improve image quality. In recent years, as a special case of CS, total variation (TV) reconstruction algorithm that uses prior information of both image sparsity and edge direction has attracted much research interest in sparse-view image reconstruction due to its ability to preserve image edges. In this paper, we propose a new adaptive-weight total variation (NAWTV) algorithm for CT image reconstruction, which is derived by considering local gradient direction continuity and the anisotropic edge property...
August 23, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30149491/development-of-pulse-shape-algorithms-for-discrimination-between-gamma-and-x-ray-radiation-pulses
#14
Mohamed S El Tokhy, Imbaby I Mahmoud
Influence of x-ray pulse generated from gamma spectrometers should be eliminated in applications, which typically uses pulse shape techniques between gamma and x-ray pulses. In this study, we proposed and tested several algorithms aiming to eliminate this influence. The algorithms are based on curve fitting (CF), artificial neural network (ANN), system identification, peak shape, amplitude search with curve fitting and pulse tracking methods. Gamma pulses and X-ray pulses are detected by NaI(TI) scintillator detector and Silicon lithium Si(Li) detector, respectively...
August 23, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30149490/discrimination-of-dna-and-rna-distribution-in-a-mammalian-cell-by-scanning-transmission-soft-x-ray-microscopy
#15
Kunio Shinohara, Atsushi Ito, Takuji Ohigashi, Masataka Kado, Shigenobu Toné
In this study, soft X-ray spectromicroscopy was applied to investigate and analyze the distribution of DNA and RNA in a mammalian cell at the spatial resolution of 400 nm. The relative distribution of DNA and RNA was examined by the SVD (singular value decomposition) method in aXis2000 program using combined full spectra of DNA and RNA at the absorption edge regions of carbon, nitrogen and oxygen. The absorption of nucleic acid was evaluated using 1s-π* transitions in the NEXAFS spectra at the nitrogen K absorption edge and distributed to DNA and RNA according to the relative level obtained above...
August 21, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30103370/the-small-animal-material-discrimination-study-based-on-equivalent-monochromatic-energy-projection-decomposition-method-with-dual-energy-ct-system
#16
Xiaochuan Wu, Peng He, Yi Zhang, Mianyi Chen, Biao Wei, Fenglin Liu, Kang An, Peng Feng
Material discrimination is an important application of dual-energy computed tomography (CT) techniques. Projection decomposition is a key problem for pre-reconstruction material discrimination. In this study, we focused on the pre-reconstruction space based on the photoelectric and Compton effect decomposition model to characterize different material components, and proposed an efficient method to calculate the projection decomposition coefficient. We converted the complex projection integral into a linear equation by calculating the equivalent monochromatic energy from the high and low energy spectrum...
August 6, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30103369/can-radiological-technologists-serve-as-primary-screeners-of-low-dose-computed-tomography-for-the-diagnosis-of-lung-cancer-1
#17
T Arai, C Nagashima, Y Muramatsu, K Murao, I Yamaguchi, N Ushio, K Hanai, M Kaneko
BACKGROUND: The Accreditation Council for Lung Cancer CT Screening of Japan established guidelines for the certification of Radiological Technologists in 2009. OBJECTIVE: To analyze the trends in examination pass rates of the Radiological Technologists and discuss the reasons. METHODS: The cohort comprised 1593 Radiological Technologists (as examinees) based on 10-year of data (with a total of 17 examination runs). First, the examinees' written test results were analyzed...
August 4, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30103368/a-retrospective-study-of-spect-ct-scans-using-suv-measurement-of-the-normal-pelvis-with-tc-99m-methylene-diphosphonate
#18
Ruifeng Wang, Xiaoyi Duan, Cong Shen, Dong Han, Junchao Ma, Wu Hulin, Xiaotong Xu, Tao Qin, Qiuju Fan, Zhaoguo Zhang, Weihua Shi, Youmin Guo
OBJECTIVE: To perform quantitative measurement based on the standardized uptake value (SUV) of Tc-99m methylene diphosphonate (MDP) in the normal pelvis using a single-photon emission tomography (SPECT)/computed tomography (CT) scanner. MATERIAL AND METHODS: This retrospective study was performed on 31 patients with cancer undergoing bone SPECT/CT scans with 99mTc-MDP. SUVmax and SUVmean of the normal pelvis were calculated based on the body weight. SUVmax and SUVmean of the bilateral anterior superior iliac spine, posterior superior iliac spine, facies auricularis ossis ilii, ischial tuberosity, and sacrum were also calculated...
July 31, 2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30124464/investigation-of-maximum-a-posteriori-probability-expectation-maximization-for-image-based-weighting-spectral-x-ray-ct-image-reconstruction
#19
Zhengdong Zhou, Runchao Xin, Shaolin Guan, Jianbo Li, Jiali Tu
Development of spectral X-ray computer tomography (CT) equipped with photon counting detector has been recently attracting great research interest. This work aims to improve the quality of spectral X-ray CT image. Maximum a posteriori (MAP) expectation-maximization (EM) algorithm is applied for reconstructing image-based weighting spectral X-ray CT images. A spectral X-ray CT system based on the cadmium zinc telluride photon counting detector and a fat cylinder phantom were simulated. Comparing with the commonly used filtered back projection (FBP) method, the proposed method reduced noise in the final weighting images at 2, 4, 6 and 9 energy bins up to 85...
2018: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/30103371/performance-evaluation-of-breast-cancer-diagnosis-with-mammography-ultrasonography-and-magnetic-resonance-imaging
#20
Hang Sun, Hong Li, Shuang Si, Shouliang Qi, Wei Zhang, He Ma, Siqi Liu, Li Yingxue, Wei Qian
OBJECTIVE: Various imaging modalities have been used to diagnose suspicious breast lesions. Purpose of this study is to compare the diagnostic accuracy for breast cancer using mammography, ultrasonography and magnetic resonance imaging (MRI). METHODS: Total 107 patients aged from 19 to 62 years are included in this retrospective study. Mammography, ultrasonography and MRI scans were performed for each patient detected with suspected breast tumor within a month. In addition, the tumor diversity (10 types of benign and 5 types of malignant) was confirmed by pathological findings of tumor biopsy...
2018: Journal of X-ray Science and Technology
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