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Journal of X-ray Science and Technology

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https://www.readbyqxmd.com/read/28621699/diagnostic-value-of-single-source-dual-energy-spectral-computed-tomography-for-papillary-thyroid-microcarcinomas
#1
Lin Li, Yong Wang, De-Hong Luo, Yan-Feng Zhao, Meng Lin, Wei Guo, Lei Hu, Chun-Wu Zhou, Xin-Ming Zhao
BACKGROUND: Ultrasound (US) and computed tomography (CT) are common diagnostic imaging methods for detecting and diagnosing papillary thyroid microcarcinoma (PTMC). However, single-source dual-energy spectral computed tomography (spectral CT) reduces beam hardening artefacts and optimizes contrast, which may add value in detecting PTMC. OBJECTIVE: To investigate values of applying single-source dual-energy spectral CT for diagnosing PTMCs, in comparison with high frequency ultrasound and conventional polychromatic images...
June 10, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28598862/the-feasibility-of-low-dose-ct-perfusion-imaging-in-gastric-cancer
#2
Zong-Qiong Sun, Yu-Xi Ge, Lin Chen, Jie Li, Lin-Fang Jin, Zhi-Hui Xie
PURPOSE: To investigate feasibility of applying low-dose CT perfusion imaging (CTPI) to diagnose gastric cancer. MATERIALS AND METHODS: Twenty patients with gastric cancer confirmed by endoscopic biopsy were undergone routine dose (120 kV, 100 mA) and low-dose (120 kV, 50 mA) CTPI examination, respectively. The original data were processed by body perfusion software, and the perfusion parameters values including blood flow (BF), blood volume (BV) and permeability surface (PS) of gastric cancer were measured...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28598861/collimated-superfine-x-ray-beam-based-x-ray-luminescence-computed-tomography
#3
Wei Zhang, Dianwen Zhu, Michael Lun, Changqing Li
X-ray luminescence computed tomography (XLCT) is a hybrid imaging modality with the potential to achieve a spatial resolution up to several hundred micrometers for targets embedded in turbid media with a depth larger than several millimeters. In this paper, we report a high spatial resolution XLCT imaging system with a collimated superfine x-ray beam in imaging the deeply embedded targets. A collimator with a 100 micrometer pinhole was mounted in the front of a powerful x-ray tube to generate a superfine x-ray pencil beam with a beam diameter of 0...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28598860/translational-motion-correction-algorithm-for-truncated-cone-beam-ct-using-opposite-projections
#4
Jawook Gu, Woong Bae, Jong Chul Ye
BACKGROUND: Cone-beam computed tomography (CBCT) is widely used in various medical imaging applications, including dental examinations. Dental CBCT images often suffer from motion artifacts caused by involuntary rigid motion of patients. However, earlier motion compensation studies are not applicable for dental CBCT systems using truncated detectors. OBJECTIVE: This study proposes a novel motion correction algorithm that can be applied for truncated dental CBCT images...
June 3, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28582954/virtual-scatter-modulation-for-x-ray-ct-scatter-correction-using-primary-modulator
#5
Hewei Gao, Lei Zhu, Rebecca Fahrig
A new scatter estimation algorithm with a concept of virtual scatter modulation for X-ray scatter correction using primary modulator is proposed to reduce the aliasing errors in the estimated scatter. Virtual scatter modulation can be realized through dividing the measured primary-modulated image by the measured modulation function. After the division, the aggravation of the aliasing of primary due to the non-uniformity of the modulation function is largely transferred to that of scatter. Since scatter in general has less high frequencies than primary does, the aggravation of its aliasing is expected to be weaker, and therefore the overall aliasing can be reduced...
May 31, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28550270/a-quantitative-evaluation-of-pleural-effusion-on-computed-tomography-scans-using-b-spline-and-local-clustering-level-set
#6
Lei Song, Jungang Gao, Sheng Wang, Youmin Guo
Estimation of the pleural effusion's volume is an important clinical issue. The existing methods cannot assess it accurately when there is large volume of liquid in the pleural cavity and/or the patient has some other disease (e.g. pneumonia). In order to help solve this issue, the objective of this study is to develop and test a novel algorithm using B-spline and local clustering level set method jointly, namely BLL. The BLL algorithm was applied to a dataset involving 27 pleural effusions detected on chest CT examination of 18 adult patients with the presence of free pleural effusion...
May 24, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28550269/surface-protection-from-high-energy-electrons-and-x-ray-radiation-analysis-in-tokamak-plasma
#7
A Salar Elahi, M Ghoranneviss
Plasma cooling due to hard x-ray radiation from the Runaway electrons is an important issue in tokamaks. Thus, developing effective methods to reduce the Runaway electrons and the emitted hard x-ray is also important for optimal tokamak plasma operation. In this study, we investigated the effects of external fields on hard x-ray intensity and the Magnetohydrodynamic (MHD) activity. In other words, we presented the effects of positive biased limiter and Resonant Helical Field (RHF) on the MHD fluctuations and hard x-ray emission from the Runaway electrons...
May 24, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28527236/a-weighted-difference-of-l1-and-l2-on%C3%A2-the%C3%A2-gradient-minimization-based-on%C3%A2-alternating-direction-method-for%C3%A2-circular%C3%A2-computed-tomography
#8
Wanli Lu, Lei Li, Ailong Cai, Hanming Zhang, Linyuan Wang, Bin Yan
Iterative reconstruction algorithms for computed tomography (CT) through total variation (TV) regularization can provide accurate and stable reconstruction results. TV minimization is the L1-norm of gradient-magnitude images and can be regarded as a convex relaxation method to replace the L0 norm. In this study, a fast and efficient algorithm, which is named a weighted difference of L1 and L2 (L1 - αL2) on the gradient minimization, was proposed and investigated. The new algorithm provides a better description of sparsity for the optimization-based algorithms than TV minimization algorithms...
May 15, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28506024/microrna-expression-profiling-in-endometriosis-associated-infertility-and-its-relationship-with-endometrial-receptivity-evaluated-by-ultrasound
#9
Xianfeng Xu, Zhenzhou Li, Jin Liu, Sha Yu, Zhaolian Wei
OBJECTIVE: To investigate the microRNA expression profiling in endometriosis-associate infertility, and relationship between the microRNA expression and endometrial receptivity evaluated by ultrasound. METHODS: First, miRNA expression profiling difference of ectopic endometrium between 8 endometriosis patients and 6 endometriosis-free patients were compared. Bioinformatics analyses detected 61 differentially expressed (DE) known miRNAs and 57 DE novel miRNAs. Next, other 24 patients were selected for checking the microRNAs in differential expression by RT-PCR...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28506023/optimization-method-of-mri-scan-parameters-of-a-double-inversion-recovery-sequence-using-a-t1-map-and-a-developed-analysis-algorithm
#10
Norio Hayashi, Kazuma Yarita, Kozue Sakata, Shunichi Motegi, Hiroyuki Nagase, Kouichi Ujita, Akio Ogura, Toshihiro Ogura, Takehiro Shimada, Yoshito Tsushima
BACKGROUND: Optimizing scan parameters for double inversion recovery (DIR) sequences remains difficult. OBJECTIVE: To evaluate a new method for optimizing DIR sequence scan parameters using T1 mapping and a newly developed analysis algorithm. METHODS: Twelve healthy volunteers underwent T1 mapping and DIR magnetic resonance imaging. The following steps were used for image optimization including: 1) measurement of gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF) T1 values to create a T1 map; 2) calculation of optimized scan parameters by using a developed analysis algorithm; 3) performance assessment of DIR magnetic resonance imaging by using the calculated optimized imaging parameters...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28506022/breast-osteoblastoma-and-recurrence-after-resection-demonstration-by-color-doppler-ultrasound
#11
Xia Li, Hua Xin, Shifeng Yang, Miaoqing Zhao, Ximing Wang, Nan Zhang
Osteoblastoma is a rare benign primary bone tumor, which occurs in any part of the skeleton. Extraskeletal osteoblastoma is rather rare. We presented an extremely rare case of extraskeletal osteoblastoma located in the breast. The tumor recurred 7 months later after resection and transformed to aggressive osteoblastoma. The histopathological features, ultrasonic manifestations and ultrasonic differential diagnoses of the primary and recurrent tumors were discussed. The recommended treatment of the tumor is surgical excision...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28506021/metal-artifact-reduction-in-spiral-fan-beam-ct-using-a-new-sinogram-segmentation-scheme
#12
Mehran Yazdi, Zohre Mansourian
Objective of this study is to present and test a new method for metal artifact reduction (MAR) by segmenting raw CT data (sinogram). The artifact suppression technique incorporates two steps namely, metal projection segmentation in the sinogram and replacement of segmented regions by new values using an interpolation method. The proposed segmentation algorithm uses the sinogram instead of reconstructed CT slices. First, one of the best and newest region-based geometric active contour models is used to detect projection data affected by metal objects (missing projections)...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28506020/rigid-motion-artifact-reduction-in-ct-using-frequency-domain-analysis
#13
Yuan Zhang, Liyi Zhang, Yunshan Sun
BACKGROUND: It is often unrealistic to assume that the subject remains stationary during a computed tomography (CT) imaging scan. A patient rigid motion can be decomposed into a translation and a rotation around an origin. How to minimize the motion impact on image quality is important. OBJECTIVE: To eliminate artifacts caused by patient rigid motion during a CT scan, this study investigated a new method based on frequency domain analysis to estimate and compensate motion impact...
May 6, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28436412/subinguinal-microsurgical-varicocelectomy-with-intraoperative-microvascular-doppler-ultrasound-leads-to-the-pain-free-outcome-after-surgery
#14
Kun-Long Lv, Ya-Dong Zhang, Jin-Tao Zhuang, Yong Gao, Liang Zhao, Zi Wan, Ming-Kuan Zhou, Jing-Wei Yu, Xiang-Zhou Sun, Yuan-Yuan Zhang, Xiang-An Tu
OBJECTIVE: To determine efficacy of intraoperative microvascular Doppler ultrasound in assisting subinguinal microsurgical varicocelectomy for pain relief in the treatment of painful varicoceles, compared to the microsurgery without Doppler ultrasound. METHODS: Total 153 patients underwent microsurgical varicocelectomy were randomly allocated to two groups: Groups 1 and 2 included 82 and 71 patients monitored with and without using intraoperative microvascular Doppler ultrasound, respectively...
April 18, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28436411/benign-mixed-epithelial-and-stromal-tumor-of-the-kidney-with-inferior-vena-cava-tumor-thrombus-a-rare-case-report-and-review-of%C3%A2-literature
#15
Chi Zhang, Xiaofei Li, Chengqiang Mo, Zhenpeng Peng, Ruilin Yang, Yiming Tang, Yuanyuan Zhang, Rongpei Wu
Mixed epithelial and stromal tumor of the kidney (MESTK) is a rare renal tumor composed of epithelial and stromal cells. In this study, we report a rare case of MESTK, which was pathologically benign but complicated with renal vein and inferior vena cava tumor thrombus. The 50-year-old female patient was admitted to hospital for a mass on the left kidney. Computed tomography showed a 32 mm×18 mm mass with slight delayed enhancement in the left renal sinus, and neoplastic thrombus was detected in left renal vein and inferior vena cava...
April 18, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28436410/a-new-approach-to-develop-computer-aided-diagnosis-scheme-of-breast-mass-classification-using-deep-learning-technology
#16
Yuchen Qiu, Shiju Yan, Rohith Reddy Gundreddy, Yunzhi Wang, Samuel Cheng, Hong Liu, Bin Zheng
PURPOSE: To develop and test a deep learning based computer-aided diagnosis (CAD) scheme of mammograms for classifying between malignant and benign masses. METHODS: An image dataset involving 560 regions of interest (ROIs) extracted from digital mammograms was used. After down-sampling each ROI from 512×512 to 64×64 pixel size, we applied an 8 layer deep learning network that involves 3 pairs of convolution-max-pooling layers for automatic feature extraction and a multiple layer perceptron (MLP) classifier for feature categorization to process ROIs...
April 18, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28387700/iterative-reconstruction-for-sparse-view-x-ray-ct-using-alpha-divergence-constrained-total-generalized-variation-minimization
#17
Shanzhou Niu, Jing Huang, Zhaoying Bian, Dong Zeng, Wufan Chen, Gaohang Yu, Zhengrong Liang, Jianhua Ma
BCKGROUND: Accurate statistical model of the measured projection data is essential for computed tomography (CT) image reconstruction. The transmission data can be described by a compound Poisson distribution upon an electronic noise background. However, such a statistical distribution is numerically intractable for image reconstruction. OBJECTIVE: Although the sinogram data is easily manipulated, it lacks a statistical description for image reconstruction. To address this problem, we present an alpha-divergence constrained total generalized variation (AD-TGV) method for sparse-view x-ray CT image reconstruction...
April 5, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28387699/synchronous-scanning-mode-of-industrial-computed-tomography-for-multiple-objects-test
#18
Fenglin Liu, Chao Quan, Weiwen Wu, Peng Feng, Yufang Cai
When testing small size and high density objects with a broad field-of-view (FOV) industrial CT system, multiple objects are always assembled evenly onto the turntable for detecting to improve test efficiency. However, the maximum X-ray's penetrating path through the materials increases, which means the CT system should collocate with a high energy X-ray source and wide-dynamic range detectors to complete the CT scanning. In this study, we proposed and tested a novel and efficient CT scanning method based on linear-arrangement and synchronous-rotating multi-turntables without enhancing the energy of X-ray source and wide-dynamic range of detectors for the CT system...
April 5, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28387698/noise-indices-adjusted-to-body-mass-index-and-an-iterative-reconstruction-algorithm-maintain-image-quality-on-low-dose-contrast-enhanced-liver-ct
#19
Yongxia Zhao, Hongna Suo, Yanmin Wu, Ziwei Zuo, Sisi Zhao, Shujie Cheng
OBJECTIVES: Since body mass index (BMI) affects medical imaging quality or noise due to penetration of the radiation through bodies with varying sizes, this study aims to investigate and determine the optimal BMI-adjusted noise index (NI) setting on the contrast-enhanced liver CT scans obtained using 3D Smart mA technology with adaptive statistical iterative reconstruction (ASIR 2.0) algorithm. MATERIALS AND METHODS: A total of 320 patients who had contrast-enhanced liver CT scans were divided into two equal-sized groups: A (18...
April 5, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/28387697/initial-analysis-of-the-middle-problem-in-ct-image-reconstruction
#20
Jiansheng Yang, Hengyong Yu, Ge Wang
The interior and exterior problems have been extensively studied in the field of reconstruction of computed tomography (CT) images, which lead to important theoretical and practical results. In this study, we formulate a middle problem of CT image reconstruction, which is more challenging than either the interior or exterior problems. In the middle problem of CT image reconstruction, projection data are measured through and only through the middle dough-like region, so that each projection profile misses data not only internally but also on both sides...
April 5, 2017: Journal of X-ray Science and Technology
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