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https://www.readbyqxmd.com/read/28624012/differentiation-of-small-intrahepatic-mass-forming-cholangiocarcinoma-from-small-liver-abscess-by-dual-source-dual-energy-ct-quantitative-parameters
#1
Ji Eun Kim, Hyun Ok Kim, Kyungsoo Bae, Jae Min Cho, Ho Cheol Choi, Dae Seob Choi
PURPOSE: To investigate the use of dual source dual-energy CT (DECT) quantitative parameters compared with the use of conventional CT for differentiating small (≤3cm) intrahepatic mass-forming cholangiocarcinoma (IMCC) from small liver abscess (LA) during the portal venous phase (PVP). MATERIAL AND METHODS: In this institutional review board-approved, retrospective study, 64 patients with IMCCs and 52 patients with LAs who were imaged in PVP using dual-energy mode were included retrospectively...
July 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28623421/comparison-of-dual-energy-ct-ultrasound-and-surface-measurement-for-assessing-tophus-dissolution-during-rapid-urate-debulking
#2
Dodji V Modjinou, Svetlana Krasnokutsky, Soterios Gyftopoulos, Virginia C Pike, Elaine Karis, Robert T Keenan, Kristen Lee, Daria B Crittenden, Jonathan Samuels, Michael H Pillinger
Tophaceous gout is painful and impairs quality of life. The optimal modality for assessing tophus resolution in response to urate-lowering treatment remains poorly defined. Using pegloticase as a model system for resolving tophi, we compared multiple imaging and physical diagnostic strategies for assessing tophus resolution. A 32-year-old subject with chronic refractory tophaceous gout was enrolled and received 6 months of pegloticase treatment. Measurements of tophi using vernier calipers (monthly), photographs and musculoskeletal ultrasound (MSK-US; every 3 months), and dual-energy CT (DECT) were compared...
June 16, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28623025/identification-of-elemental-weight-fraction-and-mass-density-of-humanoid-tissue-equivalent-materials-using-dual-energy-computed-tomography
#3
Kohei Shimomura, Fujio Araki, Yuki Kono, Yoshiyuki Asai, Takamichi Murakami, Tomoko Hyodo, Masahiko Okumura, Kenji Matsumoto, Hajime Monzen, Yasumasa Nishimura
The purpose of this study was to obtain the fraction by weight of the elemental composition and mass density of a humanoid tissue phantom that includes lung tissue, soft tissue, and bone tissue, by using dual energy computed tomography (DECT). The fraction by weight and the mass density for tissue-equivalent materials were calculated by means of a least-squares method with a linear attenuation coefficient, using monochromatic photon energies of 10-140keV, as obtained from DECT. The accuracy of calculated values for the fractions by weight of H (hydrogen), C (carbon), N (nitrogen), and O (oxygen) as verified by comparing the values with those that were analyzed using the combustion technique...
June 13, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28622420/technical-note-comparison-of-megavoltage-dual-energy-and-single-energy-ct-based-%C3%AE-maps-for-a-4-channel-breast-coil-in-pet-mri
#4
John C Patrick, R Terry Thompson, Aaron So, John Butler, David Faul, Robert Z Stodilka, Slav Yartsev, Frank S Prato, Stewart Gaede
PURPOSE: The purpose of this study was to describe and evaluate methods for calculating a megavoltage computed tomography (MVCT) derived MR hardware attenuation map (μ-map) and dual-energy CT (DECT) for 511 keV photons. METHODS: Phantom measurements were acquired on a whole-body hybrid PET/MRI system, using a four-channel receive-only MR radiofrequency (RF) breast coil. Two acquisitions were performed: with the phantoms positioned in the four-channel RF breast coil, and without the breast coil...
June 16, 2017: Medical Physics
https://www.readbyqxmd.com/read/28622166/quantitative-analysis-of-iodine-image-of-dual-energy-computed-tomography-at-rest-comparison-with-99mtc-tetrofosmin-stress-rest-single-photon-emission-computed-tomography-myocardial-perfusion-imaging-as-the-reference-standard
#5
Takehiro Nakahara, Takuji Toyama, Masahiro Jinzaki, Ryotaro Seki, Yuichiro Saito, Tetsuya Higuchi, Minoru Yamada, Masashi Arai, Yoshito Tsushima, Sachio Kuribayashi, Masahiko Kurabayashi
PURPOSE: Dual-energy computed tomography (DECT) can be used for visual determination of iodine distribution in the myocardium (iodine image); however, the accuracy and reproducibility of the process remains debatable. Because of the low contrast-to-noise ratio of CT, we hypothesized that quantitative measurement may be more accurate for detecting myocardial ischemia. In this study, we evaluated our quantitative method by comparing it with visual analysis using Tc-tetrofosmin (TF) stress-rest single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) as the reference standard...
June 15, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28620054/an-assessment-of-the-autonomic-nervous-system-in-the-electrohypersensitive-population-a-heart-rate-variability-and-skin-conductance-study
#6
Soafara Andrianome, Jonathan Gobert, Laurent Hugueville, Erwan Stéphan-Blanchard, Frederic Telliez, Brahim Selmaoui
The aim of the study was twofold: first, to compare the activity of the autonomic nervous system (ANS) between the population self-declared as electrohypersensitive (EHS) and their matched control individuals without intended exposure to electromagnetic fields (EMF). The second objective was to determine whether acute exposure to different radiofrequency signals modifies ANS activity in EHS. For that purpose, two different experiments were undertaken, in which ANS activity was assessed through heart rate variability (HRV) and skin conductance (SC)...
June 15, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28592818/characteristics-of-chinese-costal-cartilage-and-costa-calcification-using-dual-energy-computed-tomography-imaging
#7
Shanyong Zhang, Jinze Zhen, Huiping Li, Shoufu Sun, Huawei Wu, Pei Shen, Zengai Chen, Chi Yang
To assess characteristics of Chinese costal cartilage and costa calcification using Dual-Energy computed tomography(DECT). 154 patients who underwent chest DECT scanning were included in our study. They were divided into following groups: less than 30 years old, 31-40 years old, 41-50 years old, 51-60 years old and over 60 years old. The sixth, seventh and eighth costal cartilages and costas were evaluated. Calcification patterns of cartilage were classified as central(C), peripheral(P), mixed(M) and no calcification(N) types...
June 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592361/ct-imaging-of-solid-renal-masses-pitfalls-and-solutions
#8
REVIEW
S Krishna, C A Murray, M D McInnes, R Chatelain, M Siddaiah, O Al-Dandan, S Narayanasamy, N Schieda
Computed tomography (CT) remains the first-line imaging test for the characterisation of renal masses; however, CT has inherent limitations, which if unrecognised, may result in errors. The purpose of this manuscript is to present 10 pitfalls in the CT evaluation of solid renal masses. Thin section non-contrast enhanced CT (NECT) is required to confirm the presence of macroscopic fat and diagnosis of angiomyolipoma (AML). Renal cell carcinoma (RCC) can mimic renal cysts at NECT when measuring <20 HU, but are usually heterogeneous with irregular margins...
June 4, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28583651/dual-energy-ct-can-detect-malignant-lymph-nodes-in-rectal-cancer
#9
I Al-Najami, M J Lahaye, R G H Beets-Tan, G Baatrup
BACKGROUND: There is a need for an accurate and operator independent method to assess the lymph node status to provide the most optimal personalized treatment for rectal cancer patients. This study evaluates whether Dual Energy Computed Tomography (DECT) could contribute to the preoperative lymph node assessment, and compared it to Magnetic Resonance Imaging (MRI). The objective of this prospective observational feasibility study was to determine the clinical value of the DECT for the detection of metastases in the pelvic lymph nodes of rectal cancer patients and compare the findings to MRI and histopathology...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28583644/improved-detection-of-melanoma-metastases-by-iodine-maps-from-dual-energy-ct
#10
Monika Uhrig, David Simons, David Bonekamp, Heinz-Peter Schlemmer
OBJECTIVE: Metastatic disease in melanoma has an unpredictable nature with deposits in rare locations such as musculature. Dual energy CT (DECT) provides high contrast-visualization of enhancement by using spectral properties of iodine. Purpose of this study was to evaluate whether iodine maps from DECT improve lesion detection in staging examinations of melanoma patients. METHODS: This retrospective study was approved by IRB and written informed consent was obtained from all patients...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28583629/evaluation-of-postoperative-lung-volume-and-perfusion-changes-by-dual-energy-computed-tomography-in-patients-with-lung-cancer
#11
Jooae Choe, Sang Min Lee, Eun Jin Chae, Sang Min Lee, Yong-Hee Kim, Namkug Kim, Joon Beom Seo
PURPOSE: The aim of our study was to retrospectively evaluate postoperative physiologic changes in lung cancer patients using dual-energy CT (DECT), and develop modified methods reflecting postoperative change for predicting pulmonary function. METHODS AND MATERIALS: 88 patients (M:F=64:24; mean age, 63.5 years) with lung cancer who underwent DECT and pulmonary function tests before and after operation were included. Volume and iodine values for perfusion of each lobe were quantified...
May 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28556239/simplified-derivation-of-stopping-power-ratio-in-the-human-body-from-dual-energy-ct-data
#12
Masatoshi Saito, Shota Sagara
PURPOSE: The main objective of this study is to propose an alternative parameterization for the empirical relation between mean excitation energies (I-value) and effective atomic numbers (Zeff ) of human tissues, and to present a simplified formulation (which we called DEEDZ-SPR) for deriving the stopping power ratio (SPR) from dual-energy (DE) CT data via electron density (ρe ) and Zeff calibration. METHODS: We performed a numerical analysis of this DEEDZ-SPR method for the human-body-equivalent tissues of ICRU Report 46, as objects of interest with unknown SPR and ρe ...
May 29, 2017: Medical Physics
https://www.readbyqxmd.com/read/28542096/modified-dual-energy-algorithm-for-calcified-plaque-removal-evaluation-in-carotid-computed-tomography-angiography-and-comparison-with-digital-subtraction-angiography
#13
Manoj Mannil, Jaychandran Ramachandran, Ilaria Vittoria de Martini, Susanne Wegener, Bernhard Schmidt, Thomas Flohr, Bernhard Krauss, Antonios Valavanis, Hatem Alkadhi, Sebastian Winklhofer
OBJECTIVES: Computed tomography angiography (CTA) is a valuable tool for the assessment of carotid artery stenosis. However, blooming artifacts from calcified plaques might result in an overestimation of the stenosis grade. The aim of this study was to investigate a new dual-energy computed tomography (DECT) technique with a modified 3-material decomposition algorithm for calcium removal in extracranial carotid artery stenosis. MATERIALS AND METHODS: In this retrospective, institutional review board-approved study, 30 calcified carotid plaques in 22 patients (15 men; mean age, 73 ± 10 years) with clinical suspicion of stroke were included...
May 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28542094/virtual-monoenergetic-imaging-and-iodine-perfusion-maps-improve-diagnostic-accuracy-of-dual-energy-computed-tomography-pulmonary-angiography-with-suboptimal-contrast-attenuation
#14
Doris Leithner, Julian L Wichmann, Thomas J Vogl, Jesko Trommer, Simon S Martin, Jan-Erik Scholtz, Boris Bodelle, Carlo N De Cecco, Taylor Duguay, John W Nance, U Joseph Schoepf, Moritz H Albrecht
OBJECTIVES: The aim of this study was to investigate the impact of virtual monoenergetic imaging (VMI+) and dual-energy computed tomography perfusion maps (DECT-PMs) on reader confidence and diagnostic accuracy in dual-energy computed tomography pulmonary angiography (DE-CTPA) studies with suboptimal contrast attenuation, compared with standard linearly blended reconstruction series. MATERIALS AND METHODS: Dual-energy computed tomography pulmonary angiography examinations with suboptimal contrast attenuation of 68 patients with suspected pulmonary embolism (PE) were included in this institutional review board-approved retrospective study...
May 24, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28540783/role-of-dual-energy-computed-tomography-in-detecting-early-recurrences-of-lung-tumours-treated-with-radiofrequency-ablation
#15
Jean Izaaryene, Vincent Vidal, Jean-Michel Bartoli, Anderson Loundou, Jean-Yves Gaubert
PURPOSE: Detecting a recurrence after lung radiofrequency ablation (RFA) is based on a group of arguments that include CT, positron emission tomography (PET-CT) at 3 months and clinical patient follow-up. There is no one examination that is absolutely reliable. Recurrences are diagnosed tardily, when the cancers are locally extended, or when the patients are metastatic. The purpose of this article is to investigate the utility of dual-energy computed tomography (DECT) in order to assess therapeutic responses to RFA for lung neoplasia...
March 23, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540211/delayed-enhancement-cardiac-computed-tomography-for-the-assessment-of-myocardial-infarction-from-bench-to-bedside
#16
REVIEW
Gaston A Rodriguez-Granillo
A large number of studies support the increasingly relevant prognostic value of the presence and extent of delayed enhancement (DE), a surrogate marker of fibrosis, in diverse etiologies. Gadolinium and iodinated based contrast agents share similar kinetics, thus leading to comparable myocardial characterization with cardiac magnetic resonance (CMR) and cardiac computed tomography (CT) at both first-pass perfusion and DE imaging. We review the available evidence of DE imaging for the assessment of myocardial infarction (MI) using cardiac CT (CTDE), from animal to clinical studies, and from 16-slice CT to dual-energy CT systems (DECT)...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28540208/myocardial-ct-perfusion-imaging-for-ischemia-detection
#17
REVIEW
Patricia Carrascosa, Carlos Capunay
Coronary computed tomography angiography (CCTA) plays an important role in many specific scenarios such as in symptomatic patients with intermediate pretest of coronary artery disease (CAD), as well as in the triage of patients with acute chest pain with TIMI risk ≤2. However, it cannot detect the presence of associated ischemia, which is critical for clinical decision making among patients with moderate to severe stenosis. Although functional information can be obtained with different non-invasive tools, cardiac CT is the unique modality that can perform a comprehensive evaluation of coronary anatomy plus the functional significance of lesions...
April 2017: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/28527587/relationship-between-carotid-computed-tomography-dual-energy-and-brain-leukoaraiosis
#18
Luca Saba, Roberto Sanfilippo, Antonella Balestrieri, Fulvio Zaccagna, Giovanni Maria Argiolas, Jasjit S Suri, Roberto Montisci
BACKGROUND: The purpose of this study was to assess if there is a correlation between the carotid computed tomography (CT) Hounsfield unit (HU)-based plaque attenuation values measured using dual-energy CT (DECT) scanner and brain leukoaraiosis (LA). METHODS: Fifty consecutive patients (34 males, 16 females; mean age, 69 years; age range, 46-84 years) who underwent carotid CT and brain magnetic resonance imaging were included in the study. CT examinations were performed with a DECT scanner, and LA lesion volume quantification was performed using a semiautomated segmentation technique...
May 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28476243/advanced-dual-energy-ct-applications-for-the-evaluation-of-the-soft-tissues-of-the-neck
#19
REVIEW
R Forghani, S K Mukherji
There are multiple emerging advanced computed tomography (CT) applications for the evaluation of the neck, many based on dual-energy CT (DECT). DECT is an advanced form of CT in which scan acquisition is performed at two different energies, enabling spectral tissue characterisation beyond what is possible with conventional single-energy CT and potentially providing a new horizon for quantitative analysis and tissue characterisation, particularly in oncological imaging. The purpose of this review is to familiarise the reader with DECT principles and review different clinical applications for the evaluation of the soft tissues of the neck...
May 2, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28471750/iterative-reconstruction-for-dual-energy-ct-with-an-average-image-induced-nonlocal-means-regularization
#20
Houjin Zhang, Dong Zeng, Jiahui Lin, Hao Zhang, Zhaoying Bian, Jing Huang, Yuanyuan Gao, Shanli Zhang, Hua Zhang, Qianjin Feng, Zhengrong Liang, Wufan Chen, Jianhua Ma
Reducing radiation dose in dual energy computed tomography (DECT) is highly desirable but it may lead to excessive noise in the filtered backprojection (FBP) reconstructed DECT images, which can inevitably increase the diagnostic uncertainty. To obtain clinically acceptable DECT images from low-mAs acquisitions, in this work we develop a novel scheme based on measurement of DECT data. In this scheme, inspired by the success of edge-preserving non-local means (NLM) filtering in CT imaging and the intrinsic characteristics underlying DECT images, i...
July 7, 2017: Physics in Medicine and Biology
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