Longitudinal investigation of ischemic stroke using magnetic resonance imaging: Animal model.
CONCLUSIONS: The MCAO animal model was successfully established on SD rats using the microsurgery to assess arterial embolization of intracranial tissue injury. PMID: 31306147 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - July 17, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

New one-step model of breast tumor locating based on deep learning.
CONCLUSIONS: We established a novel One-step model which improves location accuracy by generating more precise bounding box via Seg-net and removing false targets by another object detection network (Cls-net). On the other hand, a real-time detection of tumor is achieved by sharing the common Base-net. The experimental results showed that the new model performed well on various irregular and blurred ultrasound images. As a result, this study demonstrated feasibility of applying deep learning scheme to detect breast lesions depicting on US image. PMID: 31306148 [PubMed - as supplied by publisher] (Source: Journal of X-R...
Source: Journal of X-Ray Science and Technology - July 17, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

X-ray scattering by the fused silica surface etched by low-energy Ar ions.
Authors: Barysheva MM, Chkhalo NI, Drozdov MN, Mikhailenko MS, Pestov AE, Salashchenko NN, Vainer YA, Yunin PA, Zorina MV Abstract Anomalously high x-ray scattering at a wavelength of 0.154 nm by super-polished substrates of fused silica, which were etched by the argon ions with the energy of 300 eV, is detected. The scattering intensity increases monotonically with increasing of the etching depth. The effect is explained by the scattering on the volume inhomogeneities with the lateral size greater than 0.5μm of the subsurface "damaged" layer. The concentration of volume inhomogeneities increases w...
Source: Journal of X-Ray Science and Technology - July 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Salient object detection method for breast tumor in ultrasound images based on  absorbing Markov chain.
CONCLUSIONS: After the adaptively selective replacement, AMC can effectively distinguish tumors from background by random walks. PMID: 31282468 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - July 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Correlation between 18F-FDG PET CT SUV and symptomatic or asymptomatic pulmonary tuberculosis.
CONCLUSION: The symptomatic pulmonary tuberculosis cases show significantly higher SUVmax than the asymptomatic cases. Based on the criteria of SUVmax greater than 2.0 to define active lesions, 100% of symptomatic cases might have active lesions while 70.4% of asymptomatic cases might have active lesions. Therefore, focused attention should be clinically paid on the asymptomatic cases of pulmonary tuberculosis to avoid miss diagnosis and delayed treatment. PMID: 31282469 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - July 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Projection data smoothing through noise-level weighted total variation regularization for low-dose computed tomography.
Authors: Deng X, Zhao Y, Li H Abstract Reducing radiation dose while maintaining the quality of the reconstructed images is a major challenge in the computed tomography (CT) community. In light of the non-stationary Gaussian noise distribution, we developed a model that incorporates a noise-level weighted total variation (NWTV) regularization term for denoising the projection data. Contrary to the well-known edge-weighted total variation method, which aims for better edge preserving, the proposed NWTV tries to adapt the regularization with the spatially varying noise levels. Experiments on simulated data as well as...
Source: Journal of X-Ray Science and Technology - July 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

FBP-type CT reconstruction algorithms for triple-source circular trajectory with different scanning radii.
Authors: Chen M, Wang D, Cai N, Xia D, Zou J, Yu H Abstract Multi-source computed tomography (CT) imaging has unique technical advantages not only for dynamic objects, but also for large-size objects by designing its imaging scan mode. Using the triple-source fan-beam imaging scan mode under three circular trajectories with two different radii, we in this study developed and analyzed theoretically several exact reconstruction algorithms in terms of full-scan and short-scan for three sets of truncated projection data. This triple-source scan configuration in different radii cases is easier to be simulated by a singl...
Source: Journal of X-Ray Science and Technology - July 2, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

NAFLD evaluation: Which is more appropriate, multislice computed tomography or ultrasound real-time shear wave elastography?
CONCLUSIONS: MSCT, but not US-SWE, had a better ability to differentiate normal or NAFLD livers from higher severity NAFLD livers. However, the diagnostic efficiency of US-SWE was superior to that of MSCT for differentiating NASH from normal or lower severity NAFLD. PMID: 31256111 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - July 2, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Comparison of vaporization using 120-W GreenLight laser versus 2-micrometer continuous laser for treating benign prostatic hyperplasia: A 24-month follow-up study of a single center.
Authors: Tao W, Xue B, Sun C, Yang D, Zhang Y, Shan Y PMID: 31256112 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - July 2, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Speckle noise reduction for ultrasound images by using speckle reducing anisotropic diffusion and Bayes threshold.
Authors: Choi H, Jeong J Abstract Ultrasound imaging has been used for diagnosing lesions in the human body. In the process of acquiring ultrasound images, speckle noise may occur, affecting image quality and auto-lesion classification. Despite the efforts to resolve this, conventional algorithms exhibit poor speckle noise removal and edge preservation performance. Accordingly, in this study, a novel algorithm is proposed based on speckle reducing anisotropic diffusion (SRAD) and a Bayes threshold in the wavelet domain. In this algorithm, SRAD is employed as a preprocessing filter, and the Bayes threshold is used t...
Source: Journal of X-Ray Science and Technology - July 2, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Comparison of geometrical uncertainties in the radiotherapy for various treatment sites with two different immobilization marking methods.
This study aims to evaluate SMM and BFRM by comparing the inter-fraction setup errors from using these two methods together with vacuum cushion immobilization in patients underwent radiotherapy for different treatment sites. MATERIALS AND METHODS: Eighteen patients diagnosed with pelvic, abdominal and thoracic malignant tumors (with 6 patients per treatment site) were enrolled in this prospective study. All patients were immobilized with vacuum cushion. Each patient was marked by both SMM and BFRM before computed tomography (CT) simulation. Target location was verified by cone beam CT images with displacements assessed...
Source: Journal of X-Ray Science and Technology - June 24, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Wide-detector CT combined iterative reconstruction in pediatric low-dose scan of the paranasal sinus.
This study aims to investigate the feasibility of using a 320-detector CT scanner with a 16 cm wide-detector combined with iterative reconstruction (IR) algorithm to further reduce radiation dose when scanning the PS. METHODS: A total of 90 children who underwent CT of the PS were randomly allocated into three groups namely, (1) the experimental group using low-dose wide-detector scan (n = 30, 9±4 years); (2) low-dose helical group (n = 30, 9±4 years); and (3) pediatric conventional group (n = 30, 8±4 years). Statistical software SPSS 19.0 was used for one-way ANOVA analysis of the general data (ag...
Source: Journal of X-Ray Science and Technology - June 24, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Deep CNN models for pulmonary nodule classification: model modification, model integration, and transfer learning.
CONCLUSIONS: Model modification, model integration, and transfer learning can play important roles to identify and generate optimal deep CNN models in classifying pulmonary nodules based on CT images efficiently. Transfer learning is preferred when applying deep learning to medical imaging applications. PMID: 31227682 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - June 24, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Adaptive control of phase leading compensator parameters applied to respiratory motion compensation system.
CONCLUSIONS: During the respiratory motion compensation, the influence of the delay time of the entire system (RMCS+RMSS+UITA) on the compensation effect was improved by adding an adaptive control PLC, which reduces compensation error and helps improve efficacy of radiation therapy. PMID: 31227683 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - June 24, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Few-view CT image reconstruction using improved total variation regularization.
In this study, we proposed and tested a new algorithm that combines penalized weighted least-squares using total generalized variation (PWLS-TGV) and dictionary learning (DL), named PWLS-TGV-DL to address this challenge. We first presented and tested this new algorithm and evaluated it through both data simulation and physical experiments. We then analyzed experimental data in terms of image qualitative and quantitative measures, such as the structural similarity index (SSIM) and the root mean square error (RMSE). The experiments and data analysis indicated that applying the new algorithm to CT data recovered images more e...
Source: Journal of X-Ray Science and Technology - June 24, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Computer-aided identification of interstitial lung disease based on computed tomography.
Authors: Yin N, Shen C, Dong F, Wang J, Guo Y, Bai L Abstract OBJECTIVE: Identification of interstitial lung disease (ILD) may be difficult in certain cases using pulmonary function tests (PFTs) or subjective radiological analysis. We evaluated the efficacy of quantitative computed tomography (CT) with 3-dimensional (3D) reconstruction for distinguishing ILD patients from healthy controls. MATERIALS AND METHODS: We retrospectively collected chest CT images of 102 ILD patients and 102 healthy matched controls, and measured the following parameters: lung parenchymal volume, emphysema indices low attenuation area ...
Source: Journal of X-Ray Science and Technology - June 18, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

The accuracy assessment of ultrasound for the diagnosis of ischiofemoral space - A Validation Study.
Authors: Lu B, Deng H, Chen B, Zhao J Abstract OBJECTIVE: To investigate and evaluate the accuracy of ultrasound (US) imaging for measurement of ischiofemoral space (IFS) compared with magnetic resonance imaging (MRI). METHODS: Twenty-five hips of 16 patients with hip pain and ipsilateral quadratus femoris muscle (QFM) edema were recruited to the IFI group, and 19 hips of 19 patients without hip pain and QFM edema were recruited as the control group. IFS of both groups was measured by US and MRI. The correlations and differences between US and MRI measurements were then assessed. Last, the receiver operating ch...
Source: Journal of X-Ray Science and Technology - June 18, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

The effects of mis-centering on radiation dose during CT head examination: A phantom study.
In this study, we aim to determine significant impact on radiation dose as a result of mis-centering during CT head examination. The scanning was performed by using Toshiba Aquilion 64 slices multi-detector CT (MDCT) scanner and dose were measured by using calibrated ionization chamber. Two scanning protocols of routine CT head; 120 kVp/ 180 mAs and 100 kVp/ 142 mAs were used represent standard and low dose, respectively. As reference measurement, the dose was first measured on standard cylindrical polymethyl methacrylate (PMMA) phantom that positioned at 104 cm from the floor (reference isocenter). The positions then we...
Source: Journal of X-Ray Science and Technology - June 18, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Measurement of 6MV small field beam profiles - comparison of micro ionization chamber and linear diode array with monte carlo code.
This study demonstrated that LDA can be used for acquisition of beam profiles for field size as low as 1×1 cm2. PMID: 31205012 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - June 18, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Diagnosis of a hamate hook fracture with 3D reconstruction of computed tomography images: A case report and review of literature.
We report the case of a 19-year old man who presented to our institution with a history of pain of one week in the ulnar side of the left wrist and continuous pressing sensation in the palm. According to patient, there was no history of acute hand trauma. The conventional roentgenograms did not show the fracture and computerized tomographic (CT) scanning demonstrated a complete fracture of the hook of the hamate. The patient was given a surgical intervention and the hamate bone was reduced through a palmar skin incision. After surgery, the operated hand was immobilized in a wrist brace and the patient was put on a rehabili...
Source: Journal of X-Ray Science and Technology - June 18, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Reduced iteration image reconstruction of incomplete projection CT using regularization strategy through Lp norm dictionary learning.
Authors: Gou J, Wu X, Dong H Abstract BACKGROUND: For sparse and limited angle projection Computed Tomography (CT), the reconstructed image usually suffers from considerable artifacts due to undersampled data. OBJECTIVE: To improve image reconstruction quality of sparse and limited angle projection CT, this study tested a novel reconstruction algorithm based on Dictionary Learning (DL) from sparse and limited projections. METHODS: The study used signal sparse representation and feature extraction to render the DL technology, which is constrained by L2 and Lp norms, respectively. A Lp Norm Dictionary Learnin...
Source: Journal of X-Ray Science and Technology - June 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Iterative image reconstruction for sparse-view CT via total variation regularization and dictionary learning.
Authors: Zhao X, Jiang C, Zhang Q, Ge Y, Liang D, Liu X, Yang Y, Zheng H, Hu Z Abstract  Recently, low-dose computed tomography (CT) has become highly desirable due to the increasing attention paid to the potential risks of excessive radiation of the regular dose CT. However, ensuring image quality while reducing the radiation dose in the low-dose CT imaging is a major challenge. Compared to classical filtered back-projection (FBP) algorithms, statistical iterative reconstruction (SIR) methods for modeling measurement statistics and imaging geometry can significantly reduce the radiation dose, while maintainin...
Source: Journal of X-Ray Science and Technology - June 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Application of automated bronchial 3D-CT measurement in pulmonary contusion complicated with acute respiratory distress syndrome.
Authors: Li Y, Dai Y, Duan X, Zhang W, Guo Y, Wang J Abstract BACKGROUNDQuantitative measurement of bronchial morphological changes in pulmonary contusion with acute respiratory distress syndrome (ARDS) has important clinical implications.OBJECTIVETo investigate the morphological changes in bronchus before and after treatment in patients with pulmonary contusion combined with ARDS using an automated bronchial three-dimensional computed tomography (3D-CT) measurement method.METHODSThe study involves a dataset of CT images of 62 patients diagnosed with pulmonary contusion combined with ARDS. The volume of pulmonary c...
Source: Journal of X-Ray Science and Technology - June 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Multi-material decomposition of spectral CT images via Fully Convolutional DenseNets.
CONCLUSIONS: The new proposed approach yielded good performance on spectral CT material decomposition, which could establish guidelines for multi-material decomposition approaches based on the deep learning algorithm. PMID: 31177260 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - June 11, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Tensor decomposition and non-local means based spectral CT image denoising.
CONCLUSIONSThe outstanding denoising performance, the high computational efficiency and the adaptive parameter selection strategy make the proposed method practical for spectral CT applications. PMID: 31081796 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - May 15, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

A pilot study of radiomics technology based  on X-ray mammography in patients with triple-negative breast cancer.
A pilot study of radiomics technology based on X-ray mammography in patients with triple-negative breast cancer. J Xray Sci Technol. 2019 May 07;: Authors: Zhang HX, Sun ZQ, Cheng YG, Mao GQ Abstract PURPOSE: To explore the radiomics features of triple negative breast cancer (TNBC) and non-triple negative breast cancer (non-TNBC) based on X-ray mammography, and to differentiate the two groups of cases. MATERIALS AND METHODS: Preoperative mammograms of 120 patients with breast ductal carcinoma confirmed by surgical pathology were retrospectively analyzed, which include 30 TNBC and 90 non-T...
Source: Journal of X-Ray Science and Technology - May 15, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Projection data smoothing through noise-level weighted total variation regularization for low-dose computed tomography.
Authors: Deng X, Zhao Y, Li H Abstract Reducing radiation dose while maintaining the quality of the reconstructed images is a major challenge in the computed tomography (CT) community. In light of the non-stationary Gaussian noise distribution, we developed a model that incorporates a noise-level weighted total variation (NWTV) regularization term for denoising the projection data. Contrary to the well-known edge-weighted total variation method, which aims for better edge preserving, the proposed NWTV tries to adapt the regularization with the spatially varying noise levels. Experiments on simulated data as well as...
Source: Journal of X-Ray Science and Technology - May 15, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Quantitative characterization of ex vivo breast tissue via x-ray phase-contrast tomography.
CONCLUSIONS: An ex vivo study of GPCI shows that it is a stable imaging modality for visualizing the breast tissue with good repeatability, and that it could be of potential for the diagnosis of breast cancer as well. PMID: 30958320 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - April 9, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Automated fiducial marker detection and fiducial point localization in CT images for lung biopsy image-guided surgery systems.
This study proposes a fiducial marker detection approach based on the features of marker image slice sequences and a fiducial point localization approach according to marker projection images, without depending on the priori-knowledge of the marker default parameters provided by the manufacturers. The accuracy of our method was validated based on a CT image dataset of 24 patients. The experimental results showed that all 144 markers of 24 patients were correctly detected, and the fiducial points were localized with the average error of 0.35 mm. In addition, the localization accuracy of the proposed method was improved by...
Source: Journal of X-Ray Science and Technology - April 9, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

A dosimetric comparison of Volumetric Modulated Arc Therapy (VMAT) and High Dose Rate brachytherapy (HDR) in localized cervical cancer radiotherapy.
Authors: Wali LM, Helal AM, Darwesh RM, Attar MA Abstract BACKGROUND: Cervical cancer radiotherapy is usually administrated through 3-Dimensional Conformal Radiation Therapy (3DCRT) followed by a brachytherapy (BT) boost. PURPOSE: To investigate whether Volumetric Modulated Arc Therapy (VMAT) can replace High Dose Rate (HDR) intracavitary BT boost for patients undergoing cervical cancer radiotherapy. MATERIALS AND METHODS: Computed Tomography (CT) images for ten patients with tandem and ovoids were included in this study. Target volumes, rectum, bladder, sigmoid, small bowel and both femoral heads were deli...
Source: Journal of X-Ray Science and Technology - April 9, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Application of two-dimensional fractional-order convolution and bounding box pixel analysis for rapid screening of pleural effusion.
In this study, a fractional-order convolution (FOC) process is used to enhance the original image for an accurate extrapolation of the desired object in an image. The specific object image feature can be improved, and an accurate quantification of the pleural effusion region can be obtained using the suitable ranges of fractional-order parameters. Based on the boundaries of homogeneous regions, the pixel ratios of the lung anatomy between normal and abnormal conditions can be computed. The pleural effusion sizes and volumes can be rapidly estimated through the number of pixel changes. The experimental results reveal that t...
Source: Journal of X-Ray Science and Technology - April 9, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Using synovial volume measurement by MRI to evaluate the effect of 32P Radiation synovectomy on hemophilic arthropathy patients.
Authors: Dou Y, Li M, Zhang L, Cheng T, Lei P, Ge Y Abstract OBJECTIVE: To evaluate the potential of synovial membrane volume measurement by MRI in monitoring the effect of radiation synovectomy on patients of Hemophilic Arthropathy (HA). METHODS: We studied 63 diseased joints of 42 HA patients who received hospitalized services at the Hemophilia Diagnosis and Treatment Center of Henan Provincial People's Hospital from May 2011 to January 2015. Unenhanced and enhanced MR scanning of each diseased joint was performed simultaneously. The volumes of synovial membrane of 21 joints from 16 patients before and after ...
Source: Journal of X-Ray Science and Technology - April 9, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Investigation of transmission computed tomography (CT) image quality and x-ray dose achievable from an experimental dual-mode benchtop x-ray fluorescence CT and transmission CT system.
CONCLUSION: The transmission CT component within the current experimental benchtop XFCT system produced images deemed acceptable for multimodal (CT + XFCT) imaging purposes, with less than 4 cGy of x-ray dose. PMID: 30909268 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 27, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Clinical application of fluoroscopic guided percutaneous antegrade ureteral stents placement for the treatment of malignant ureteral obstruction.
CONCLUSION: Fluoroscopic guided percutaneous ureteral stents placement is a safe, efficient procedure and has a high success rate in patients with malignant ureteral obstruction. PMID: 30909269 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 27, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Intermittent CT fluoroscopic guided lung biopsy - Retrospective analysis of success rate, radiation exposure, complications and duration of procedure.
This study aims to investigate correlation between the radiation dose and fluoroscopic CT exposure factors to establish the low dose parameters for performing percutaneous lung biopsies, as well as the relationship of the mean diameter and depth of lesions with radiation dose, procedure time, success and complication rates. MATERIALS AND METHODS: This is a retrospective study to analyse lung biopsies performed using intermittent CT fluoroscopic technique with 18 G semi-automated coaxial gun on 256 slice scanner. A total of 50 patients were included in the study. Biopsy was done in three mAs and KVp settings (30 and 7...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Clinical application of diffusion-weighted magnetic resonance imaging in radiotherapy for nasopharyngeal carcinoma.
CONCLUSION: DWI can be used for sensitive and accurate diagnosis of lymph node metastasis in the neck and retropharyngeal space, monitoring of the radiotherapy effect in early stages of NPC and development of new medical treatment strategies. PMID: 30856148 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Rigid motion artifact reduction in CT using extended difference function.
CONCLUSIONS: The proposed new method yields the improved performance on accuracy of motion estimation with higher computational efficiency, and thus it can produce high-quality images. PMID: 30856149 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Three-dimensional structure tensor based PET/CT fusion in gradient domain.
In this study, we generalized and applied this gradient based image fusion method into 3D for non-small cell lung cancer PET/CT image fusion. According the characteristic of lung PET/CT images, we proposed a novel 3D structure tensor based feature, which can be used to construct a weighted structure tensor containing important local detail of both PET and CT images. The fusion gradient domain is deduced from a rank one tensor, which is the closest approximation of the weighted structure tensor in geometry. Based on the fusion gradient domain, final PET/CT fusion image is obtained by solving a Poisson equation. Comparing wi...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Efficient solving algorithm for determining the exact sampling condition of limited-angle computed tomography reconstruction.
Authors: Li Z, Wang L, Zhang W, Cai A, Li L, Liang N, Yan B Abstract Total variation (TV) regularization-based iterative reconstruction algorithms have an impressive potential to solve limited-angle computed tomography with insufficient sampling projections. The analysis of exact reconstruction sampling conditions for a TV-minimization reconstruction model can determine the minimum number of scanning angle and minimize the scanning range. However, the large-scale matrix operations caused by increased testing phantom size is the computation bottleneck in determining the exact reconstruction sampling conditions in pr...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Generalized linear model (GLM) analysis: Multivariables of microcalcification specimens obtained via X-ray guided by stereotactic wire localization biopsy.
Authors: Wang Q, Li E, Song Y, Ma P, Wang Y, Liu X, Qi W, Zhao X Abstract OBJECTIVE: To retrospectively explore correlation of the resected specimen volume of breast microcalcification lesions and endogenous and exogenous factors of stereotactic needle localization biopsy (SNLB). MATERIALS AND METHODS: Totally 214 patients underwent SNLB for non-palpable breast lesion with microcalcification lesions. Of 211 patients, 198 patients underwent single needle localization and 13 patients underwent multi-needle localization (26 lesions). Lesion sizes, distribution characteristics, lesion localization accuracy and rese...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Investigation of AAA dose calculation algorithm accuracy in surface and buildup region for 6MV photon beam using markus parallel-plate ion chamber.
This study aims to compare the surface doses of separate field sizes calculated by different version of The Analytical Anisotropic Algorithm (AAA) and measured by the parallel-plate ion chamber that is admitted as the most reliable dosimetry system for the surface region dose measurements. In order to measure the near surface dose, water equivalent solid phantom was used and measurements were made for 6MV photon beam at 100 cm source-detector distance for 5×5, 10×10, and 20×20 cm2 field sizes. AAA 8.9 and AAA 15.1 versions of the Varian Eclipse TPS were used for surface dose calculations by generating...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Breast mass detection and diagnosis using fused features with density.
CONCLUSIONS: We have proposed a mass detection system, which achieves better detection accuracy performance than the existing state-of-art algorithm. We also propose a mass diagnosis system based on the fused features with density, which is more efficient than other feature model and classifier on the same dataset. PMID: 30856154 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

A pilot study of low-dose CT perfusion imaging (LDCTPI) technology in patients with triple-negative breast cancer.
Authors: Sun ZQ, Hu SD, Shao L, Jin LF, Lv Q, Yan G Abstract PURPOSE: To investigate associations between the clinicopathologic features and CT perfusion parameters of triple-negative breast cancer (TNBC) and non-TNBC using low-dose computed tomography perfusion imaging (LDCTPI), and to find potential clinical applications in the prognosis assessment of TNBC. MATERIALS AND METHODS: A total of 60 patients with breast cancer confirmed by pathological examination were studied prospectively using LDCTPI on a 64-slice spiral CT scanner. The acquired volume data were used for calculations, mapping, and analysis by us...
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Segmentation of pulmonary vascular tree by incorporating vessel enhancement filter and variational region-growing.
CONCLUSIONS: This study demonstrated feasibility of segmenting the pulmonary vessel effectively by incorporating vessel enhancement filters and the anisotropic diffusion filter with the variational region growing algorithm. Our method cannot only segment both large and peripheral vessels, but also distinguish the vessels from the adjacent tissues, especially the airway walls. PMID: 30856156 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - March 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Structure tensor total variation for CBCT reconstruction.
In this study, we proposed to use the structure tensor total variation (STV) that penalizes the eigenvalues of the structure tensor for CBCT reconstruction. The STV penalty extends the TV penalty, with many important properties maintained such as convexity and rotation and translation invariance. The STV penalty utilizes gradient information more effectively and has a stronger ability to capture local image structural variation. The objective function was constructed with the penalized weighted least-square (PWLS) strategy and the gradient descent (GD) method was used to optimize the objective function. Besides, we investi...
Source: Journal of X-Ray Science and Technology - February 13, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

3D reconstruction of CT scans aid in preoperative planning for sarcomatoid renal cancer: A case report and mini-review.
Authors: Glybochko PV, Alyaev YG, Khokhlachev SB, Fiev DN, Shpot EV, Bezrukov EA, Petrovsky NV, Zhang D, Proskura AV, Iurova MV, Lester Matz E, Wang X, Atala A, Zhang Y, V Butnaru D Abstract Contrast-enhanced multi-slice computed tomography (MSCT) is commonly used in the diagnosis of complex malignant tumours. This technology provides comprehensive and accurate information about tumour size and shape in relation to solid tumours and the affected adjacent organs and tissues. This case report demonstrates the benefit of using MSCT 3D imaging for preoperative planning in a patient with late-stage (T4) sarcomatoid rena...
Source: Journal of X-Ray Science and Technology - January 30, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Dosimetric verification of lung phantom calculated by collapsed cone convolution: A  Monte Carlo and experimental evaluation.
CONCLUSIONS: This study demonstrates that the CCC algorithm has potential to calculate dose with sufficient accuracy for 3D conformal radiotherapy within the thorax where a significant amount of tissue heterogeneity exists. PMID: 30614811 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - January 8, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Automatic hip geometric feature extraction in dxa imaging using regional random forest.
CONCLUSION: The proposed technique's ability to measure HGFs could be useful in research on the cause and facts of hip fracture and could help in the development of new guidelines for hip fracture risk assessment in the future. The technique will reduce workload and improve the use of X-ray devices. PMID: 30594942 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - January 1, 2019 Category: Radiology Tags: J Xray Sci Technol Source Type: research

The effectiveness of bismuth breast shielding with protocol optimization in CT scans of the thorax.
CONCLUSION: This study showed that CT radiation exposure on the breast could be reduced by using a bismuth shield and low tube potential protocol without compromising the image quality. PMID: 30584178 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - December 28, 2018 Category: Radiology Tags: J Xray Sci Technol Source Type: research

Application of 640-slice CT wide-detector volume scan in low-dose CT pulmonary angiography.
CONCLUSIONS: Compared with the conventional spiral scan, using 640-slice CT volume scan with ASIR in CTPA is more accurate in scanning phase and has lower radiation dose. There is no significant difference in image quality between the two groups. PMID: 30584179 [PubMed - as supplied by publisher] (Source: Journal of X-Ray Science and Technology)
Source: Journal of X-Ray Science and Technology - December 28, 2018 Category: Radiology Tags: J Xray Sci Technol Source Type: research