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https://www.readbyqxmd.com/read/28440784/dual-energy-ct-characteristics-of-colon-and-rectal-cancer-allows-differentiation-from-stool-by-dual-source-ct
#1
İlknur Özdeniz, İlkay S İdilman, Seyfettin Köklü, Erhan Hamaloğlu, Mustafa Özmen, Deniz Akata, Muşturay Karçaaltıncaba
PURPOSE: We aimed to determine dual-energy computed tomography (DECT) characteristics of colorectal cancer and investigate effectiveness of DECT method in differentiating tumor from stool in patients with colorectal cancer. METHODS: Fifty consecutive patients with colorectal tumors were enrolled. Staging was performed by DECT (80-140 kV) using dual-source CT after rectal air insufflation and without bowel preparation. Both visual and quantitative analyses were performed at 80 kV and 140 kV, on iodine map and virtual noncontrast (VNC) images...
April 25, 2017: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/28438727/influence-of-telecommunication-modality-internet-transmission-quality-and-accessories-on-speech-perception-in-cochlear-implant-users
#2
Georgios Mantokoudis, Roger Koller, Jérémie Guignard, Marco Caversaccio, Martin Kompis, Pascal Senn
BACKGROUND: Telecommunication is limited or even impossible for more than one-thirds of all cochlear implant (CI) users. OBJECTIVE: We sought therefore to study the impact of voice quality on speech perception with voice over Internet protocol (VoIP) under real and adverse network conditions. METHODS: Telephone speech perception was assessed in 19 CI users (15-69 years, average 42 years), using the German HSM (Hochmair-Schulz-Moser) sentence test comparing Skype and conventional telephone (public switched telephone networks, PSTN) transmission using a personal computer (PC) and a digital enhanced cordless telecommunications (DECT) telephone dual device...
April 24, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28435761/dual-energy-ct-in-head-and-neck-imaging
#3
REVIEW
Elise D Roele, Veronique C M L Timmer, Lauretta A A Vaassen, Anna M J L van Kroonenburgh, A A Postma
PURPOSE OF REVIEW: To explain the technique of Dual-energy CT (DECT) and highlight its applications and advantages in head and neck radiology. RECENT FINDINGS: Using DECT, additional datasets can be created next to conventional images. In head and neck radiology, three material decomposition algorithms can be used for improved lesion detection and delineation of the tumor. Iodine concentration measurements can aid in differentiating malignant from nonmalignant lymph nodes and benign posttreatment changes from tumor recurrence...
2017: Current Radiology Reports
https://www.readbyqxmd.com/read/28420889/evaluation-of-urinary-stone-composition-and-differentiation-between-urinary-stones-and-phleboliths-using-single-source-dual-energy-computed-tomography
#4
Nanako Ogawa, Shuhei Sato, Kentaro Ida, Katsuya Kato, Yuichi Ariyoshi, Koichiro Wada, Yasutomo Nasu, Susumu Kanazawa
The aim of this study was to investigate the utility of single-source dual-energy computed tomography (SS-DECT) composition analysis in characterizing different types of urinary stones and differentiating them from phleboliths. This study included 29 patients with urinary stones who were scheduled for surgery. All patients were scanned, first using single-energy computed tomography acquisition and then DECT acquisition on SS-DECT. Dual-energy data were archived to a Gemstone spectral imaging (GSI) viewer (GE Healthcare, Milwaukee, WI, USA)...
April 2017: Acta Medica Okayama
https://www.readbyqxmd.com/read/28420124/applying-broadband-dielectric-spectroscopy-bds-for-the-biophysical-characterization-of-mammalian-tissues-under-a-variety-of-cellular-stresses
#5
Maria P Souli, Panagiotis Klonos, Adamantia F Fragopoulou, Ifigeneia V Mavragani, Ioannis S Pateras, Nikolaos Kostomitsopoulos, Lukas H Margaritis, Pavlos Zoumpoulis, Loukas Kaklamanis, Dimitris Kletsas, Vassilis G Gorgoulis, Apostolos Kyritsis, Polycarpos Pissis, Alexandros G Georgakilas
The dielectric properties of biological tissues can contribute non-invasively to a better characterization and understanding of the structural properties and physiology of living organisms. The question we asked, is whether these induced changes are effected by an endogenous or exogenous cellular stress, and can they be detected non-invasively in the form of a dielectric response, e.g., an AC conductivity switch in the broadband frequency spectrum. This study constitutes the first methodological approach for the detection of environmental stress-induced damage in mammalian tissues by the means of broadband dielectric spectroscopy (BDS) at the frequencies of 1-10⁶ Hz...
April 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28397977/methodological-accuracy-of-image-based-electron-density-assessment-using-dual-energy-computed-tomography
#6
Christian Möhler, Patrick Wohlfahrt, Christian Richter, Steffen Greilich
PURPOSE: Electron density is the most important tissue property influencing photon and ion dose distributions in radiotherapy patients. Dual-energy computed tomography (DECT) enables the determination of electron density by combining the information on photon attenuation obtained at two different effective x-ray energy spectra. Most algorithms suggested so far use the CT numbers provided after image reconstruction as input parameters, i.e. are imaged-based. To explore the accuracy that can be achieved with these approaches, we quantify the intrinsic methodological and calibration uncertainty of the seemingly simplest approach...
April 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28372824/diagnostic-accuracy-of-dual-energy-computed-tomography-in-patients-with-gout-a-meta-analysis
#7
REVIEW
Young Ho Lee, Gwan Gyu Song
OBJECTIVE: This study aimed to evaluate the diagnostic performance of dual-energy computed tomography (DECT) for patients with gout. METHODS: We searched the Medline, Embase, and Cochrane Library databases, and performed a meta-analysis on the diagnostic accuracy of DECT in patients with gout. RESULTS: A total of eight studies including 510 patients with gout and 268 controls (patients with non-gout inflammatory arthritis) were available for the meta-analysis...
March 8, 2017: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28369941/a-model-based-iterative-reconstruction-algorithm-dira-using-patient-specific-tissue-classification-via-dect-for-improved-quantitative-ct-in-dose-planning
#8
Alexandr Malusek, Maria Magnussony, Michael Sandborg, Gudrun Alm Carlsson
PURPOSE: To develop and evaluate-in a proof-of-concept configuration-a novel iterative reconstruction algorithm (DIRA) for quantitative determination of elemental composition of patient tissues for application to brachytherapy with low energy (< 50 keV) photons and proton therapy. METHODS: DIRA was designed as a model-based iterative reconstruction algorithm, which uses filtered backprojection, automatic segmentation and multimaterial tissue decomposition. The evaluation was done for a phantom derived from the voxelized ICRP 110 male phantom...
March 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28331170/-pathological-complete-response-of-metastatic-testicular-tumor-with-persistent-low-level-positive-human-chorionic-gonadotropin-after-chemotherapy
#9
Ryosuke Jikuya, Akihito Hashizume, Tomoyuki Tatenuma, Nobuhiko Mizuno, Kentaro Muraoka, Masaki Kawai, Akitoshi Takizawa, Takeshi Kishida
We describe a case of testicular tumor with multiple metastasis to the lung,retoroperitoneal lymph node, and brain. After chemotherapy the retroperitoneal lymph node and brain metastasis disappeared,but the multiple pulmonary metastases but not disappear,although they were reduced in size. Since the human chorionic gonadotoropin (HCG) was persistently dected at a low level,we performed a testosterone tolerance test. The HCG level became undetectable for a while,but was detected at a low level again. Then the patient underwent residual tumor removal of some of the residual pulmonary disease,which was diagnosed as tumor necrosis...
March 2017: Hinyokika Kiyo. Acta Urologica Japonica
https://www.readbyqxmd.com/read/28301210/update-of-dual-energy-ct-applications-in-the-genitourinary-tract
#10
Ravi K Kaza, Lakshmi Ananthakrishnan, Avinash Kambadakone, Joel F Platt
OBJECTIVE: Dual-energy CT (DECT) is being increasingly used for abdominal imaging because it provides incremental benefit of material characterization without significant increase in radiation dose. This article provides an overview of current DECT techniques and use of DECT in urinary tract imaging for assessment of renal masses and urinary calculi characterization and in CT urography. CONCLUSION: Incorporation of DECT into clinical practice and use of its material characterization capabilities in urinary tract imaging enable characterization of urinary calculi and incidental renal lesions and can reduce radiation dose by allowing generation of virtual unenhanced images...
March 16, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28295434/the-potential-of-dual-energy-ct-to-reduce-proton-beam-range-uncertainties
#11
Esther Bär, Arthur Lalonde, Gary Royle, Hsiao-Ming Lu, Hugo Bouchard
PURPOSE: Dual-energy CT (DECT) promises improvements in estimating stopping power ratios (SPRs) for proton therapy treatment planning. Although several comparable mathematical formalisms have been proposed in literature, the optimal techniques to characterize human tissue SPRs with DECT in a clinical environment are not fully established. The aim of this work is to compare the most robust DECT methods against conventional single-energy CT (SECT) in conditions reproducing a clinical environment, where CT artifacts and noise play a major role on the accuracy of these techniques...
March 15, 2017: Medical Physics
https://www.readbyqxmd.com/read/28295418/technical-note-on-the-accuracy-of-parametric-two-parameter-cross-section-models-in-dual-energy-ct-applications
#12
Dong Han, Mariela A Porras-Chaverri, Joseph A O'Sullivan, David G Politte, Jeffrey F Williamson
PURPOSE: To evaluate and compare the theoretically achievable accuracy of two families of two-parameter photon cross-section models: basis vector model (BVM) and modified parametric fit model (mPFM). METHOD: The modified PFM assumes that photoelectric absorption and scattering cross sections can be accurately represented by power functions in effective atomic number and / or energy plus the Klein-Nishina cross section, along with empirical corrections that enforce exact prediction of elemental cross sections...
March 15, 2017: Medical Physics
https://www.readbyqxmd.com/read/28291377/dual-energy-ct-applications-in-salivary-gland-lesions
#13
Ashish Chawla, Sivasubramanian Srinivasan, Tze Chwan Lim, Geoiphy Pulickal, Jagadish Shenoy, Wilfred Chin Guan Peh
The increasing availability of dual-energy computed tomography (DECT) has set the stage for an exciting era in CT technology. This technique is extensively used throughout the world with numerous centres working on the applications of DECT in various radiology subspecialty areas. DECT provides many advantages over the conventional single-energy scan. Instead of a single set of images, radiologists have access to multiple sets of images from a single acquisition. The DECT workstation enables the reader to generate images, according to the clinical setting, in order to answer a specific clinical question...
March 14, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28273739/dual-energy-ct-with-virtual-monochromatic-images-and-metal-artifact-reduction-software-for-reducing-metallic-dental-artifacts
#14
Jihoon Cha, Hyung-Jin Kim, Sung Tae Kim, Yi Kyung Kim, Ha Youn Kim, Gyeong Min Park
Background Metallic dental prostheses may degrade image quality on head and neck computed tomography (CT). However, there is little information available on the use of dual-energy CT (DECT) and metal artifact reduction software (MARS) in the head and neck regions to reduce metallic dental artifacts. Purpose To assess the usefulness of DECT with virtual monochromatic imaging and MARS to reduce metallic dental artifacts. Material and Methods DECT was performed using fast kilovoltage (kV)-switching between 80-kV and 140-kV in 20 patients with metallic dental prostheses...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28273652/potential-of-gadolinium-as-contrast-material-in-second-generation-dual-energy-computed-tomography-an-ex-vivo-phantom-study
#15
Malte N Bongers, Christoph Schabel, Bernhard Krauss, Claus D Claussen, Konstantin Nikolaou, Christoph Thomas
PURPOSE: To evaluate the potential of gadolinium (Gd) as contrast material (CM) in second generation dual energy computed tomography (DECT). MATERIAL AND METHODS: In a phantom model, DECT post-processing was used to increase Gd attenuation using advanced monoenergetic extrapolation (MEI), to create virtual non-contrast images (Gd-VNC) and Gd maps and to quantify Gd content. Dilutions of Gd and iodinated CM (7-296 HU) were filled in syringes, placed in an attenuation phantom and scanned with standard DECT protocols (80 &100/Sn140 kV)...
February 22, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28267884/microscopic-dual-energy-ct-microdect-a-flexible-tool-for-multichannel-ex-vivo-3d-imaging-of-biological-specimens
#16
S Handschuh, C J Beisser, B Ruthensteiner, B D Metscher
Dual-energy computed tomography (DECT) uses two different x-ray energy spectra in order to differentiate between tissues, materials or elements in a single sample or patient. DECT is becoming increasingly popular in clinical imaging and preclinical in vivo imaging of small animal models, but there have been only very few reports on ex vivo DECT of biological samples at microscopic resolutions. The present study has three main aims. First, we explore the potential of microscopic DECT (microDECT) for delivering isotropic multichannel 3D images of fixed biological samples with standard commercial laboratory-based microCT setups at spatial resolutions reaching below 10 μm...
March 7, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28258740/uric-acid-versus-non-uric-acid-renal-stones-in%C3%A2-vivo-differentiation-with-spectral-ct
#17
F Lombardo, M Bonatti, G A Zamboni, G Avesani, N Oberhofer, M Bonelli, A Pycha, R Pozzi Mucelli, G Bonatti
AIM: To differentiate uric acid from non-uric acid renal stones based on their spectral attenuation values. MATERIALS AND METHODS: The present study was approved by the institutional review board and the need for informed consent was waived. Thirty-three consecutive patients (21 men, 12 women; mean age 55 years) with symptomatic urolithiasis underwent dual-energy computed tomography (DECT) using a second-generation dual-source CT system. Stone composition was assessed by means of chemical analysis after extraction or spontaneous expulsion...
February 28, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28249339/dual-energy-ct-a-novel-technique-for-diagnostic-testing-of-fragility-fractures-of-the-pelvis
#18
Carsten Hackenbroch, Hans-Joachim Riesner, Patricia Lang, Fabian Stuby, Burkhardt Danz, Benedikt Friemert, Hans-Georg Palm
Background The incidence of fragility fractures of the pelvis is increasing. Established methods to diagnose this condition include X-rays, computed tomography (CT) and magnetic resonance imaging (MRI). Dual energy CT (DECT) is a modern technology for the imaging of bone oedema/bruises and has been used in injuries of the extremities and spine. It is unclear whether this technique can also be used in fragility fractures of the pelvis. The aim of this study was to perform a literature research and survey of the "AG Becken III" members of the German Society of Trauma Surgery (DGU) on the usefulness of DECT in fractures of the pelvis...
February 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28245141/detecting-intracranial-hemorrhage-using-automatic-tube-current-modulation-with-advanced-modeled-iterative-reconstruction-in-unenhanced-head-single-and-dual-energy-dual-source-ct
#19
Jan-Erik Scholtz, Julian L Wichmann, Dennis W Bennett, Doris Leithner, Ralf W Bauer, Thomas J Vogl, Boris Bodelle
OBJECTIVE: The purpose of our study was to determine diagnostic accuracy, image quality, and radiation dose of low-dose single- and dual-energy unenhanced third-generation dual-source head CT for detection of intracranial hemorrhage (ICH). MATERIALS AND METHODS: A total of 123 patients with suspected ICH were examined using a dual-source 192-MDCT scanner. Standard-dose 120-kVp single-energy CT (SECT; n = 36) and 80-kVp and 150-kVp dual-energy CT (DECT; n = 30) images were compared with low-dose SECT (n = 32) and DECT (n = 25) images obtained using automated tube current modulation (ATCM)...
May 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28238226/dual-energy-ct-in-gout-a-review-of-current-concepts-and-applications
#20
REVIEW
Hong Chou, Teck Yew Chin, Wilfred C G Peh
Dual-energy computed tomography (DECT) is a relatively recent development in the imaging of gouty arthritis. Its availability and usage have become increasingly widespread in recent years. DECT is a non-invasive method for the visualisation, characterisation and quantification of monosodium urate crystal deposits which aids the clinician in the early diagnosis, treatment and follow-up of this condition. This article aims to give an up to date review and summary of existing literature on the role and accuracy of DECT in the imaging of gout...
March 2017: Journal of Medical Radiation Sciences
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