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Spectral CT

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https://www.readbyqxmd.com/read/29762057/comparison-of-image-quality-and-radiation-exposure-between-conventional-imaging-and-gemstone-spectral-imaging-in-abdominal-ct-examination
#1
Tianqi Fang, Wei Deng, Martin Wai-Ming Law, Liangping Luo, Liyun Zheng, Ying Guo, Hanwei Chen, Bingsheng Huang
OBJECTIVE: To compare patients' image quality and radiation exposure between gemstone spectral imaging (GSI) with rapid kV switching technique and conventional polychromatic imaging performed in abdominal CT examinations. METHODS: Adult patients who were referred to abdominal CT from October 2015 to March 2016 were enrolled. Unenhanced CT with conventional polychromatic imaging mode and tri-phase (arterial/portal/delayed phase) contrast-enhanced scan with GSI mode were performed with different protocols respectively...
May 15, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29757473/iterative-inversion-of-deformation-vector-fields-with-feedback-control
#2
Abhishek Kumar Dubey, Alexandros-Stavros Iliopoulos, Xiaobai Sun, Fang-Fang Yin, Lei Ren
PURPOSE: Often, the inverse deformation vector field (DVF) is needed together with the corresponding forward DVF in 4D reconstruction and dose calculation, adaptive radiation therapy, and simultaneous deformable registration. This study aims at improving both accuracy and efficiency of iterative algorithms for DVF inversion, and advancing our understanding of divergence and latency conditions. METHOD: We introduce a framework of fixed-point iteration algorithms with active feedback control for DVF inversion...
May 14, 2018: Medical Physics
https://www.readbyqxmd.com/read/29752156/spectral-ct-imaging-of-lung-cancer-quantitative-analysis-of-spectral-parameters-and-their-correlation-with-tumor-characteristics
#3
Feng Wu, Hang Zhou, Feng Li, Jiang-Tao Wang, Tao Ai
RATIONALE AND OBJECTIVES: Spectral computed tomography (CT) imaging is widely used in the diagnosis of various cancers. This study aimed to analyze the characteristics of lung squamous cell carcinoma (SC) and adenocarcinoma (AC) using spectral CT imaging. METHODS: Sixty patients who were examined via spectral CT imaging and confirmed as having AC or SC via surgery and pathology were enrolled in this research project. A spectrum CT scanner was used, and both plain and enhanced CT scans were conducted to acquire spectral images...
May 8, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29749624/image-quality-of-conventional-images-of-dual-layer-spectral-ct-a-phantom-study
#4
F van Ommen, E Bennink, A Vlassenbroek, J W Dankbaar, A M R Schilham, M A Viergever, H W A M de Jong
PURPOSE: Spectral CT using a dual layer detector offers the possibility of retrospectively introducing spectral information to conventional CT images. In theory, the dual-layer technology should not come with a dose or image quality penalty for conventional images. In this study, we evaluate the influence of a dual-layer detector (IQon Spectral CT, Philips) on the image quality of conventional CT images, by comparing these images with those of a conventional but otherwise technically comparable single-layer CT scanner (Brilliance iCT, Philips), by means of phantom experiments...
May 10, 2018: Medical Physics
https://www.readbyqxmd.com/read/29725834/ct-metal-artifacts-in-patients-with-total-hip-replacements-for-artifact-reduction-monoenergetic-reconstructions-and-post-processing-algorithms-are-both-efficient-but-not-similar
#5
Kai Roman Laukamp, Simon Lennartz, Victor-Frederic Neuhaus, Nils Große Hokamp, Robert Rau, Markus Le Blanc, Nuran Abudullayev, Anastasios Mpotaris, David Maintz, Jan Borggrefe
OBJECTIVES: This study compares metal artifact (MA) reduction in imaging of total hip replacements (THR) using virtual monoenergetic images (VMI), for MA-reduction-specialized reconstructions (MAR) and conventional CT images (CI) from detector-based dual-energy computed tomography (SDCT). METHODS: Twenty-seven SDCT-datasets of patients carrying THR were included. CI, MAR and VMI with different energy-levels (60-200 keV) were reconstructed from the same scans. MA width was measured...
May 3, 2018: European Radiology
https://www.readbyqxmd.com/read/29715308/analysis-of-dual-energy-spectral-ct-and-pathological-grading-of-clear-cell-renal-cell-carcinoma-ccrcc
#6
Jinyan Wei, Jianhong Zhao, Xueling Zhang, Dan Wang, Wenjuan Zhang, Zhiping Wang, Junlin Zhou
OBJECTIVE: To discuss the dual energy spectral computer tomography (CT) imaging features of the pathological grading of clear cell renal cell carcinoma (ccRCC) and the correlation between spectral CT imaging features and pathology. MATERIALS AND METHODS: We performed analyses of 62 patients with confirmed diagnosis of ccRCC. All patients underwent non-enhanced CT and dual-phase (cortex phase, CP and parenchyma phase, PP) contrast-enhanced CT with dual energy spectral mode...
2018: PloS One
https://www.readbyqxmd.com/read/29714501/automatic-spectral-imaging-protocol-and-iterative-reconstruction-for-radiation-dose-reduction-in-typical-hepatic-hemangioma-computed-tomography-with-reduced-iodine-load-a-preliminary-study
#7
Wei Li, Aiyin Li, Bin Wang, Xiuyuan Niu, Xin Cao, Xinyi Wang, Hao Shi
OBJECTIVES: To evaluate the effect of automatic spectral imaging protocol selection (ASIS) and adaptive statistical iterative reconstruction (ASiR) technique in the reduction of radiation and contrast medium dose in typical hepatic hemangioma (HH) dual-energy spectral CT (DEsCT). METHODS: 62 patients with suspected HH were randomly divided into two groups equally: group A, conventional 120-kVp CT with standard iodine load; group B, DEsCT with ASIS technique and reduced iodine load, two sets of monochromatic spectral images were reconstructed: 69keV level with 30% ASiR (group B1 ) and 52keV level with 50%ASiR (group B2 )...
May 1, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29698763/exploring-the-dna-damaging-potential-of-chitosan-and-citrate-reduced-gold-nanoparticles-physicochemical-approach
#8
Sonia, Komal, Shrikant Kukreti, Mahima Kaushik
Nanomaterials offer a wide range of biomedical applications including gene/drug delivery, biosensing and bioimaging. The cytotoxic and genotoxic potential of nanoparticles need to be thoroughly investigated before their biomedical usage. This study aims to investigate and compare the nanotoxicology of chitosan (CH-Au-Np) and citrate (CI-Au-Np) reduced gold nanoparticles via exploring their interaction with Calf thymus DNA (Ct-DNA) utilizing various physicochemical techniques. Structural characterization of these Nps was done using UV-Visible Spectroscopy, Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM)...
April 23, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29694929/3-acetyl-8-methoxy-2-h-chromen-2-one-derived-schiff-bases-as-potent-antiproliferative-agents-insight-into-the-influence-of-4-n-substituents-on-the-in-vitro-biological-activity
#9
G Kalaiarasi, S Rex Jeya Rajkumar, G Aswini, S Dharani, Frank R Fronczek, R Prabhakaran
A series of 3-acetyl-8-methoxycoumarin appended thiosemicarbazones (1-4) was prepared from the reaction of 3-acetyl-8-methoxycoumarin with 4(N)-substituted thiosemicarbazides in a view of ascertaining their biological properties with the change of N-terminal substitution in the thiosemicarbazide moiety. Comprehensive characterization was brought about by various spectral and analytical methods. The molecular structures of all the compounds were determined by single crystal X-ray diffraction analysis. Binding studies with Calf thymus DNA (CT-DNA) and proteins such as Bovine Serum Albumin (BSA) and Human Serum Albumin (HSA) indicated an intercalative mode of binding with DNA and static quenching mechanism with proteins...
April 14, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29691563/-clinical-analysis-of-spectrum-ct-imaging-reducing-metal-artifacts-of-oral-and-maxillofacial-region
#10
Qi Sun, Min-Jun Dong, Xing Yang, Meng-da Jiang, Xiao-Feng Tao
PURPOSE: To assess the capability of monochromatic energy images of gemstone spectral imaging(GSI) by using spectral CT in reducing metal artifacts of oral and maxillofacial region. METHODS: Spectral CT imaging was applied to 46 patients with metallic implants with GSI sequence to measure CT numbers (expressed in Hounsfield units, HU) and SD (standard deviation) numbers of the soft tissues. 11 monochromatic-image groups were obtained, ranging from 40 keV(kiloelectronvolts) to 140 keV (every 10 keV as one group)...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29686915/the-usefulness-of-dual-layer-spectral-computed-tomography-for-myelography-a-case-report-and-review-of-the-literature
#11
Yuji Iyama, Takeshi Nakaura, Ayumi Iyama, Kazuhiro Katahira, Yasuyuki Yamashita
We describe a case of lumbar stenosis in which retrospective spectral analysis using dual-layer spectral detector computed tomography (CT) had the ability to expand the evaluable region in the spinal canal. Spinal canal stenosis is a common condition whose symptoms (such as lower back and leg pain with walking) deteriorate the quality of life. Generally, magnetic resonance imaging (MRI) and CT myelography are performed to diagnose canal stenosis. Dual-layer spectral detector CT can yield virtual monochromatic imaging and retrospective on-demand spectral analysis without a prescan setting...
2018: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/29685549/accuracy-of-iodine-quantification-in-dual-layer-spectral-ct-influence-of-iterative-reconstruction-patient-habitus-and-tube-parameters
#12
Andreas P Sauter, Felix K Kopp, Daniela Münzel, Julia Dangelmaier, Martin Renz, Bernhard Renger, Rickmer Braren, Alexander A Fingerle, Ernst J Rummeny, Peter B Noël
PURPOSE: Evaluation of the influence of iterative reconstruction, tube settings and patient habitus on the accuracy of iodine quantification with dual-layer spectral CT (DL-CT). MATERIAL AND METHODS: A CT abdomen phantom with different extension rings and four iodine inserts (1, 2, 5 and 10 mg/ml) was scanned on a DL-CT. The phantom was scanned with tube-voltages of 120 and 140 kVp and CTDIvol of 2.5, 5, 10 and 20 mGy. Reconstructions were performed for eight levels of iterative reconstruction (i0-i7)...
May 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29685547/radiation-dose-and-image-conspicuity-comparison-between-conventional-120-kvp-and-150-kvp-with-spectral-beam-shaping-for-temporal-bone-ct
#13
Chang Rae Kim, Ji Young Jeon
OBJECTIVE: The purpose of this article is to compare radiation doses and conspicuity of anatomic landmarks of the temporal bone between the CT technique using spectral beam shaping at 150 kVp with a dedicated tin filter (150 kVp-Sn) and the conventional protocol at 120 kVp. METHODS: 25 patients (mean age, 46.8 ± 21.2 years) were examined using the 150-kVp Sn protocol (200 reference mAs using automated tube current modulation, 64 × 0.6 mm collimation, 0...
May 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29681607/-utility-of-double-layer-spectral-detector-ct
#14
Kazuhiro Katahira
No abstract text is available yet for this article.
2018: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29674804/three-material-decomposition-in-multi-energy-ct-impact-of-prior-information-on-noise-and-bias
#15
Liqiang Ren, Cynthia H McCollough, Lifeng Yu
In order to perform material decomposition for a three-material mixture, dual-energy CT (DECT) has to incorporate an additional condition, typically the prior information related to certain physical constraints such as volume or mass conservation. With the introduction of photon-counting CT and other multi-energy CT (MECT) platform, more than 2 energy bins can be simultaneously acquired, which in principle can solve a three-material problem without the need of additional prior information. The purpose of this work was to investigate the impact of prior information on noise and bias properties of three-material decomposition in both DECT and MECT, and to evaluate if the prior information is still needed in MECT...
March 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29669371/need-for-quantitative-measurement-methods-for-posterior-uveitis-comparison-of-dual-fa-icga-angiography-edi-oct-choroidal-thickness-and-sun-vitreous-haze-evaluation-in-stromal-choroiditis
#16
Filippo Fabro, Carl P Herbort
BACKGROUND/PURPOSE: Quantitative methods for posterior uveitis are necessary for precise appraisal and follow-up of inflammation in practice and in clinical trials. The aim of this study was to assess fluorescein angiography (FA), indocanine green angiography (ICGA), and enhanced depth imaging optical coherence tomography choroidal thickness (EDI-OCT CT) in two stromal choroiditis entities, birdshot retinochoroiditis (BRC), and Vogt-Koyanagi-Harada disease (VKH), as well as to determine (1) disease patterns, (2) respective response to therapy, and (3) their potential utility in clinical trials in comparison to vitreous haze, the present standard outcome used in clinical trials...
April 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29659426/evaluation-of-virtual-monoenergetic-images-on-pulmonary-vasculature-using-the-dual-layer-detector-based-spectral-computed-tomography
#17
Abed Ghandour, Andrew Sher, Negin Rassouli, Amar Dhanantwari, Prabhakar Rajiah
OBJECTIVE: To evaluate the ability of retrospectively generated virtual monoenergetic images (VMIs) from the detector-based spectral computed tomography (SDCT) to augment pulmonary artery enhancement in CT and if iodine map can predict the optimal monoenergetic level. METHODS: The study included 79 patients with contrast-enhanced chest CT scans on an SDCT scanner. Conventional 120-kVp images and VMI from 40 to 80 keV were generated. Attenuation, noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were measured at 7 different locations in the pulmonary arterial system...
April 13, 2018: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/29643571/a-general-ct-reconstruction-algorithm-for-model-based-material-decomposition
#18
Steven Tilley, Wojciech Zbijewski, Jeffrey H Siewerdsen, J Webster Stayman
Material decomposition in CT has the potential to reduce artifacts and improve quantitative accuracy by utilizing spectral models and multi-energy scans. In this work we present a novel Model-Based Material Decomposition (MBMD) method based on an existing iterative reconstruction algorithm derived from a general non-linear forward model. A digital water phantom with inserts containing different concentrations of calcium was scanned on a kV switching system. We used the presented method to simultaneously reconstruct water and calcium material density images, and compared the results to an image domain and a projection domain decomposition method...
March 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29627398/anatomical-investigations-on-intraosseous-access-in-stillborns-comparison-of-different-devices-and-techniques
#19
Zeynep Fuchs, Martin Scaal, Heinz Haverkamp, Friederike Koerber, Thorsten Persigehl, Frank Eifinger
AIM: Intraosseous (IO)-access plays an alternative route during resuscitation. Our study was performed to investigate the successful rate of IO-access in preterm and term stillborns using different devices and techniques. METHODS: The cadavers used were legal donations. 16 stillborns, median: 29.2weeks (IQR 27.2-38.4) were investigated. Two different needles (a: Butterfly needle,21G,Venofix® Fa.Braun; b: Arrow® EZ-IO® 15G, Teleflex,Dublin,Ireland) were used. Needles were inserted i: manually, using a Butterfly needle; ii: manually, using EZ-IO® needle or iii: using a battery-powered semi-automatic drill (Arrow® EZ-IO® )...
April 5, 2018: Resuscitation
https://www.readbyqxmd.com/read/29626944/molecular-imaging-of-inflammatory-arthritis-and-related-disorders
#20
REVIEW
François Jamar, Annibale Versari, Filippo Galli, Frédéric Lecouvet, Alberto Signore
Rheumatic disorders comprise a number of diseases that range from benign, mildly symptomatic degenerative disease to severe systemic disorders such as giant-cell vasculitis with dramatic consequences such as acute blindness. The former is relatively common, whereas the latter is rare. In between, commonly encountered disorders such as rheumatoid arthritis and the various spondyloarthritides, with or without peripheral enthesitis, are daily challenges for the caring physician. Clinical evaluation is of utmost importance and is constantly described under the form of specialist guidelines in all parts of the world...
May 2018: Seminars in Nuclear Medicine
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