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Penny Wang, Stacy E Smith, Rajesh Garg, Fengxin Lu, Alyssa Wohlfahrt, Anarosa Campos, Kathleen Vanni, Zhi Yu, Daniel H Solomon, Seoyoung C Kim
Objectives: Dual-energy CT (DECT) scan is a sensitive and specific tool used to visualise and quantify monosodium urate (MSU) crystal deposits in the joints. Few studies have examined MSU crystal deposits in patients with asymptomatic hyperuricemia (ie, hyperuricemia in the absence of gout) using DECT. Methods: We conducted a prospective, non-interventional cross-sectional study to detect MSU crystal deposits on DECT scans among patients with asymptomatic hyperuricemia...
2018: RMD Open
Vinit Baliyan, Hamed Kordbacheh, Bimal Parameswaran, Balaji Ganeshan, Dushyant Sahani, Avinash Kambadakone
PURPOSE: To study the impact of keV levels of virtual monoenergetic images generated from rapid kVp-switching dual-energy CT (rsDECT) on CT texture analysis (CTTA). METHODS: This study included 30 consecutive patients (59.3 ± 12 years; range 34-77 years; 17M:13F) who underwent portal venous phase abdominal CT on a rsDECT scanner. Axial 5-mm monoenergetic images at 5 energy levels (40/50/60/70/80 keV) were created and CTTA of liver was performed. CTTA comprised a filtration-histogram technique with different spatial scale filter (SSF) values (0-6)...
March 14, 2018: Abdominal Radiology
Pierre Durieux, Pierre Alain Gevenois, Alain Van Muylem, Nigel Howarth, Caroline Keyzer
OBJECTIVE: The purpose of this study is to investigate the magnitude of differences between attenuation values measured on virtual unenhanced images and true unenhanced images obtained using third-generation dual-source dual-energy CT (DECT). SUBJECTS AND METHODS: A total of 83 patients requiring thoracoabdominal CT for cancer workup were included in this prospective study. CT examinations included true unenhanced acquisitions (tube potential, 120 kVp) and arterial and portal phase dual-energy CT (DECT) acquisitions (tube potential, 100 kVp and Sn 150 kVp [where Sn denotes the interposition of a tin filter in the high-energy beam]; tube current-exposure time product, 190 and 95 mAs)...
March 12, 2018: AJR. American Journal of Roentgenology
Mark Gainey, Montserrat Carles, Michael Mix, Philipp T Meyer, Michael Bock, Anca-Ligia Grosu, Dimos Baltas
Recently, there has been an increase in the imaging modalities available for radiotherapy planning and radiotherapy prognostic outcome: dual energy computed tomography (CT; DECT), dynamic contrast enhanced CT, dynamic contrast enhanced magnetic resonance imaging (MRI), diffusion-weighted MRI, positron emission tomography-CT, dynamic contrast enhanced ultrasound, magnetic resonance spectroscopy and positron emission tomography-MR. These techniques enable more precise gross tumor volume definition than CT alone and moreover allow subvolumes within the gross tumor volume to be defined which may be given a boost dose or an individual voxelized dose prescription may be derived...
March 9, 2018: Future Oncology
Robbert W van Hamersvelt, Nienke G Eijsvoogel, Casper Mihl, Pim A de Jong, Arnold M R Schilham, Nico Buls, Marco Das, Tim Leiner, Martin J Willemink
We investigated the feasibility and extent to which iodine concentration can be reduced in computed tomography angiography imaging of the aorta and coronary arteries using low tube voltage and virtual monochromatic imaging of 3 major dual-energy CT (DECT) vendors. A circulation phantom was imaged with dual source CT (DSCT), gemstone spectral imaging (GSI) and dual-layer spectral detector CT (SDCT). For each scanner, a reference scan was acquired at 120 kVp using routine iodine concentration (300 mg I/ml). Subsequently, scans were acquired at lowest possible tube potential (70, 80, 80 kVp, respectively), and DECT-mode (80/150Sn, 80/140 and 120 kVp, respectively) in arterial phase after administration of iodine (300, 240, 180, 120, 60, 30 mg I/ml)...
March 8, 2018: International Journal of Cardiovascular Imaging
Yunhe Xie, Christopher Ainsley, Lingshu Yin, Wei Zou, James McDonough, Timothy D Solberg, Alexander Lin, Boon-Keng Kevin Teo
A major source of uncertainty in proton therapy is the conversion of Hounsfield unit (HU) to proton stopping power ratio relative to water (SPR). In this study, we measured and quantified the accuracy of a stoichiometric dual energy CT (DECT) SPR calibration. We applied a stoichiometric DECT calibration method to derive the SPR using CT images acquired sequentially at [Formula: see text] and [Formula: see text]. The dual energy index was derived based on the HUs of the paired spectral images and used to calculate the effective atomic number (Zeff ), relative electron density ([Formula: see text]), and SPRs of phantom and biological materials...
March 7, 2018: Physics in Medicine and Biology
Claudia Frellesen, Mehrnoush Azadegan, Simon S Martin, Katharina Otani, Tommaso DʼAngelo, Christian Booz, Katrin Eichler, Bita Panahi, Moritz Kaup, Ralf W Bauer, Thomas J Vogl, Julian L Wichmann
PURPOSE: The aim of this study was to evaluate the diagnostic performance of virtual noncalcium (VNCa) dual-energy computed tomography (DECT) reconstructions enabling visualization of bone marrow edema for characterization of incidental thoracolumbar compression fractures in routine thoracoabdominal staging computed tomography (CT). MATERIALS AND METHODS: We retrospectively analyzed 51 oncological patients without suspected fracture or indicative complaints presenting at least 1 thoracolumbar compression fracture on routine thoracoabdominal staging DECT who had been examined between October 2015 and June 2017 using third-generation dual-source CT, had a previous CT within 3 months before, and also had undergone additional magnetic resonance imaging within 14 days, which served as the standard of reference...
February 27, 2018: Investigative Radiology
Satomi Kawamoto, Matthew K Fuld, Daniel Laheru, Peng Huang, Elliot K Fishman
Pancreatic cancer remains a major health problem, and only less than 20% of patients have resectable disease at the time of initial diagnosis. Systemic chemotherapy is often used in the patients with borderline resectable, locally advanced unresectable disease and metastatic disease. CT is often used to assess for therapeutic response; however, conventional imaging including CT may not correctly reflect treatment response after chemotherapy. Dual-energy (DE) CT can acquire datasets at two different photon spectra in a single CT acquisition, and permits separating materials and extract iodine by applying a material decomposition algorithm...
February 23, 2018: Abdominal Radiology
Susama Rani Mandal, Avinav Bharati, Rezvan Ravanfar Haghighi, Sudhir Arava, Ruma Ray, Priya Jagia, Sanjiv Sharma, Sabyasachi Chatterjee, Millo Tabin, Munish Sharma, Sanjay Sharma, Pratik Kumar
PURPOSE: In this study non-calcified plaque composition is evaluated by Dual Energy CT (DECT). Energy Dispersive X-ray Spectroscopy (EDS) has been used to study the Plaque composition. An attempt has been made to explain the DECT results with EDS analysis. METHODS: Thirty-two ex-vivo human cadaver coronary artery samples were scanned by DECT and data was evaluated to calculate their effective atomic number and electron density (Zeff & ρe ) by inversion method...
January 2018: Physica Medica: PM
Ismail T Ali, William D Wong, Teresa Liang, Faisal Khosa, Memoona Mian, Sabeena Jalal, Savvas Nicolaou
OBJECTIVE: The purpose of this study is to determine the utility of dual-energy CT (DECT) for assessing carpal fractures and to obtain an attenuation value cutoff (in Hounsfield units) to identify bone marrow edema due to an acute carpal fracture. MATERIALS AND METHODS: In this retrospective study, 24 patients who presented with wrist fractures from September 3, 2014, through March 9, 2015, underwent imaging with DECT (80 and 140 kVp). Using the three-material decomposition algorithm specific for virtual noncalcium to construct images, two radiologists identified carpal fractures and associated bone marrow edema...
February 22, 2018: AJR. American Journal of Roentgenology
Carlo N De Cecco, Damiano Caruso, U Joseph Schoepf, Domenico De Santis, Giuseppe Muscogiuri, Moritz H Albrecht, Felix G Meinel, Julian L Wichmann, Philip F Burchett, Akos Varga-Szemes, Douglas H Sheafor, Andrew D Hardie
OBJECTIVES: To assess the image quality and diagnostic accuracy of a noise-optimized virtual monoenergetic imaging (VMI+) algorithm compared with standard virtual monoenergetic imaging (VMI) and linearly-blended (M_0.6) reconstructions for the detection of hypervascular liver lesions in dual-energy CT (DECT). METHODS: Thirty patients who underwent clinical liver MRI were prospectively enrolled. Within 60 days of MRI, arterial phase DECT images were acquired on a third-generation dual-source CT and reconstructed with M_0...
February 19, 2018: European Radiology
André Euler, Markus M Obmann, Zsolt Szucs-Farkas, Achille Mileto, Caroline Zaehringer, Anna L Falkowski, David J Winkel, Daniele Marin, Bram Stieltjes, Bernhard Krauss, Sebastian T Schindera
OBJECTIVES: To compare image quality and radiation dose of abdominal split-filter dual-energy CT (SF-DECT) combined with monoenergetic imaging to single-energy CT (SECT) with automatic tube voltage selection (ATVS). METHODS: Two-hundred single-source abdominal CT scans were performed as SECT with ATVS (n = 100) and SF-DECT (n = 100). SF-DECT scans were reconstructed and subdivided into composed images (SF-CI) and monoenergetic images at 55 keV (SF-MI). Objective and subjective image quality were compared among single-energy images (SEI), SF-CI and SF-MI...
February 19, 2018: European Radiology
Sebastian D Reinartz, Christiane K Kuhl, Kerstin Fehrenbacher, Andreas Napp
RATIONALE AND OBJECTIVE: To identify the influence of various parameters for reducing artifacts in computed tomography (CT) of commonly used pacemakers or implantable cardioverter-defibrillator (ICD) lead tips. MATERIALS AND METHODS: This ex vivo phantom study compared two CT techniques (Dual-Energy CT [DECT] vs. Dual-Source CT [DSCT]), as well as the influence of incremental alterations of current-time product and pacemaker lead-tip angle with respect to the gantry plane...
February 13, 2018: Academic Radiology
Stephan Skornitzke, Franziska Fritz, Philipp Mayer, Marco Koell, Jens Hansen, Gregor Pahn, Thilo Hackert, Hans-Ulrich Kauczor, Wolfram Stiller
OBJECTIVE: Quantitative evaluation of different bolus-tracking trigger delays for acquisition of dual-energy (DE) computed tomography (CT) iodine maps as an alternative to CT perfusion. METHODS: Prior to this retrospective analysis of prospectively acquired data, DECT perfusion sequences were dynamically acquired in 22 patients with pancreatic carcinoma using dual-source CT at 80/140kVp with tin filtration. After deformable motion-correction, perfusion maps of blood flow (BF) were calculated from 80kVp image series of DECT, and iodine maps were calculated for each of the 34 DECT acquisitions per patient...
February 15, 2018: British Journal of Radiology
Jessica L Nute, Megan C Jacobsen, Wolfgang Stefan, Wei Wei, Dianna D Cody
PURPOSE: A prototype QC phantom system and analysis process were developed to characterize the spectral capabilities of a fast kV-switching dual-energy computed tomography (DECT) scanner. This work addresses the current lack of quantitative oversight for this technology, with the goal of identifying relevant scan parameters and test metrics instrumental to the development of a dual-energy quality control (DEQC). METHODS: A prototype elliptical phantom (effective diameter: 35 cm) was designed with multiple material inserts for DECT imaging...
February 15, 2018: Medical Physics
Bowen Shi, Huimin Lin, Miao Zhang, Wei Lu, Ying Qu, Huan Zhang
Gastric cancer remains fourth in cancer incidence worldwide with a five-year survival of only 20%-30%. Peritoneal metastasis is the most frequent type of metastasis that accompanies unresectable gastric cancer and is a definitive determinant of prognosis. Preventing and controlling the development of peritoneal metastasis could play a role in helping to prolong the survival of gastric cancer patients. A non-invasive and efficient imaging technique will help us to identify the invasion and metastasis process of peritoneal metastasis and to monitor the changes in tumor nodules in response to treatments...
January 22, 2018: Journal of Visualized Experiments: JoVE
Yuan Yuan, Chang Liu, Xi Xiang, Tong-Ling Yuan, Li Qiu, Yi Liu, Yu-Bin Luo, Y Zhao, Martin Herrmann
OBJECTIVE: The present study was performed to localize the articular deposition of monosodium urate (MSU) crystal in joints. We compare the detection efficiencies of dual-energy CT (DECT) and ultrasound scans. METHODS: Analyses by DECT and ultrasound were performed with 184 bilateral joints of the lower limbs of 54 consecutive gout patients. All joints were categorized into (1) knee, (2) ankle, (3) MTP1, and (4) MTP2, and sorted into those with and those without detectable MSU deposition...
February 13, 2018: Rheumatology International
Shingo Ohira, Kentaro Wada, Takero Hirata, Naoyuki Kanayama, Toshiki Ikawa, Tsukasa Karino, Yuya Nitta, Masaru Isono, Yoshihiro Ueda, Masayoshi Miyazaki, Masahiko Koizumi, Teruki Teshima
BACKGROUND AND PURPOSE: The accurate delineation of pancreatic tumor with respiratory motion is challenging. This study demonstrates the application of contrast-enhanced four-dimensional dual-energy computed tomography (CE-4D-DECT) for tumor delineation and assesses the objective and subjective image quality. MATERIAL AND METHODS: Twelve patients underwent CE-4D-DECT, and quantitative spectral analysis was performed on the resulting virtual monochromatic images (VMI) to determine the optimal VMI (O-VMI) with the highest contrast-to-noise ratio (CNR)...
February 5, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
Chenyang Shen, Bin Li, Liyuan Chen, Ming Yang, Yifei Lou, Xun Jia
PURPOSE: Accurate calculation of proton stopping power ratio (SPR) relative to water is crucial to proton therapy treatment planning, since SPR affects prediction of beam range. Current standard practice derives SPR using a single CT scan. Recent studies showed that dual-energy CT (DECT) offers advantages to accurately determine SPR. One method to further improve accuracy is to incorporate prior knowledge on human tissue composition through a dictionary approach. In addition, it is also suggested that using CT images with multiple (more than two) energy channels, i...
February 5, 2018: Medical Physics
Thorsten Sellerer, Peter B Noël, Manuel Patino, Anushri Parakh, Sebastian Ehn, Sascha Zeiter, Jasmin A Holz, Johannes Hammel, Alexander A Fingerle, Franz Pfeiffer, David Maintz, Ernst J Rummeny, Daniela Muenzel, Dushyant V Sahani
OBJECTIVES: Evaluation of imaging performance across dual-energy CT (DECT) platforms, including dual-layer CT (DLCT), rapid-kVp-switching CT (KVSCT) and dual-source CT (DSCT). METHODS: A semi-anthropomorphic abdomen phantom was imaged on these DECT systems. Scans were repeated three times for CTDIvol levels of 10 mGy, 20 mGy, 30 mGy and different fat-simulating extension rings. Over the available range of virtual-monoenergetic images (VMI), noise as well as quantitative accuracy of hounsfield units (HU) and iodine concentrations were evaluated...
February 5, 2018: European Radiology
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