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https://www.readbyqxmd.com/read/29156519/in-vivo-assessment-of-the-osteo-protective-effects-of-eugenol-in-alveolar-bone-tissues
#1
Hatem M Abuohashish, Dina A Khairy, Maha M Abdelsalam, Ahmed Alsayyah, Mohammed M Ahmed, Salim S Al-Rejaie
Estrogen deficiency following menopausal provokes alveolar bone loss, remodeling and inflammation. Eugenol is a phenolic compound with wide dental applications and anti-inflammatory properties. In the present study, the potential protective role of eugenol against alveolar bone deformities was investigated in an ovariectomized (OVX) rodent model. Two doses of eugenol (2.5 and 5 mg/kg/d) were administered to OVX animals for 12 weeks. In Serum, markers of bone metabolism and pro-inflammatory cytokines were estimated using ELISA...
November 14, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29155625/effect-of-iodine-based-contrast-material-on-radiation-dose-at-ct
#2
Ehsan Abadi, Pooyan Sahbaee, Ehsan Samei
No abstract text is available yet for this article.
December 2017: Radiology
https://www.readbyqxmd.com/read/29154259/evaluation-of-coefficients-to-derive-organ-and-effective-doses-from-cone-beam-ct-cbct-scans-a-monte-carlo-study
#3
Abdullah Abuhaimed, Colin J Martin
Regular imaging is used throughout image guided radiation therapy (IGRT) to improve treatment delivery. In order for treatment procedures to be optimized, the doses delivered by imaging exposures should be taken into account. CT dosimetry methods based on the CT dose index (CTDI), measured with a 100 mm long pencil ionization chamber (CTDI<sub>100</sub>) in standard phantoms, are not designed for the cone beam CT (CBCT) imaging systems used in radiotherapy, therefore a modified version has been proposed for CBCT by the International Electrotechnical Commission (CTDI<sub>IEC</sub>)...
November 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29154256/patient-doses-from-medical-examinations-in-russia-2009-2015
#4
Mikhail I Balonov, Vladislav Golikov, Irina Zvonova, Larisa Chipiga, Sergey Kalnitsky, Svetlana Sarycheva, Alexander Vodovatov
The aim of current study was to evaluate adult patient doses in Russia in context of patient protection. Effective doses from X-ray and nuclear medicine examinations were assessed using two approaches. The first was based on data collection performed by authors in hospitals in St-Petersburg and other 17 Russian regions. The second approach was to assess mean doses through the collective dose estimated annually within the federal data bank ESKID. In 2015, 203 million examinations were conducted in Russia, i...
November 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29154198/evaluation-of-antioxidant-dna-targeting-antimicrobial-and-cytotoxic-studies-of-imine-capped-copper-and-nickel-nanoparticles
#5
P Adwin Jose, J Dhaveethu Raja, M Sankarganesh, J Rajesh
In this work, we have synthesized pyrimidine derivatives of Schiff base ligand 2-(4,6-dimethoxypyrimidin-2-ylimino)methyl)-6-methoxyphenol (DPMM) stabilized copper nanoparticles (DPMM-CuNPs) and nickel nanoparticles (DPMM-NiNPs) by modified Brust-Schiffrin technique as two step phase transfer assisted method and confirmed by UV-Visible, SEM and TEM analysis. The free radical scavenging activity of DPMM, DPMM-CuNPs &DPMM-NiNPs with 2, 2'-diphenylpicryl hydrazyl (DPPH), hydrogen peroxide (H2O2) super oxide dismutase (SOD) and nitric oxide (NO) shows that the antioxidant activity of DPMM-CuNPs is higher than DPMM &DPMM-NiNPs...
November 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29153466/focal-boost-to-residual-gross-tumor-volume-in-brachytherapy-for-cervical-cancer-a-feasibility-study
#6
Niluja Thiruthaneeswaran, Nicki Groom, Gerry Lowe, Linda Bryant, Peter J Hoskin
PURPOSE: Image-guided plan optimization with MRI and CT for interstitial and intracavitary brachytherapy is an established technique in treating cervical cancer. The purpose of this study was to assess the feasibility of boosting the dose to the residual gross tumor volume (GTV-Tres) to 140% of the high-risk clinical target volume (HR-CTV) prescription. METHODS AND MATERIALS: Brachytherapy plans from 50 consecutive patients were analyzed in this study. All received external beam radiotherapy followed by brachytherapy (6 Gy × 4 fraction or 7 Gy × 4 fraction to HR-CTV)...
November 15, 2017: Brachytherapy
https://www.readbyqxmd.com/read/29152898/tolerance-levels-of-ct-number-to-electron-density-table-for-photon-beam-in-radiotherapy-treatment-planning-system
#7
Minoru Nakao, Shuichi Ozawa, Kiyoshi Yamada, Katsunori Yogo, Fumika Hosono, Masahiro Hayata, Akito Saito, Kentaro Miki, Takeo Nakashima, Yusuke Ochi, Daisuke Kawahara, Yoshiharu Morimoto, Toru Yoshizaki, Hiroshige Nozaki, Kosaku Habara, Yasushi Nagata
The accuracy of computed tomography number to electron density (CT-ED) calibration is a key component for dose calculations in an inhomogeneous medium. In a previous work, it was shown that the tolerance levels of CT-ED calibration became stricter with an increase in tissue thickness and decrease in the effective energy of a photon beam. For the last decade, a low effective energy photon beam (e.g., flattening-filter-free (FFF)) has been used in clinical sites. However, its tolerance level has not been established yet...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152675/a-randomized-double-blind-placebo-controlled-trial-of-vitamin-d-supplementation-in-juvenile-onset-systemic-lupus-erythematosus-positive-effect-on-trabecular-microarchitecture-using-hr-pqct
#8
G L Lima, J A Paupitz, N E Aikawa, J C Alvarenga, R M Rodrigues Pereira
In this randomized double-blind placebo-controlled 24-week trial, cholecalciferol supplementation at 50,000 IU/week effectively improved bone microarchitecture parameters in juvenile-onset systemic lupus erythematosus (JoSLE) patients, as assessed by high-resolution peripheral quantitative computed tomography (HR-pQCT) at tibia site. An increase in the trabecular number and a decrease in the trabecular separation were observed, suggesting that vitamin D supplementation may be recommended for JoSLE patients with its deficiency...
November 19, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29152665/effects-of-wd%C3%A2-3-on-tumor-growth-and-the-expression-of-integrin-%C3%AE-v%C3%AE-3-and-erk1-2-in-mice-bearing-human-gastric-cancer-using-the-18f%C3%A2-rgd-pet-ct-imaging-system
#9
Chunhui Jin, Bao-Nan Zhang, Zhipeng Wei, Bo Ma, Qi Pan, Pingping Hu
Activation of the vitronectin receptor αvβ3 and the phosphorylation of extracellular signal‑regulated kinase (ERK)1/2 are critical events during tumor development and progression. The aim of the present study was to investigate the effects of WD‑3, a formula used in traditional Chinese medicine, on integrin αvβ3 and ERK1/2 expression in vivo using a nude mouse‑human gastric cancer xenograft model combined with non‑invasive, real‑time 18F‑Arg‑Gly‑Asp (RGD) positron emission tomography (PET)/computerized tomography (CT) imaging methods...
October 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29152432/acute-changes-in-mentation-in-a-patient-with-hepatic-cirrhosis-treated-with-high-doses-of-dexamethasone
#10
Luis Dabul, Andrew Droney, Juan Oms, Marcos A Sanchez-Gonzalez
Despite the anti-inflammatory benefits of steroids in the management of multiple medical conditions, they are associated with undesired metabolic and psychiatric side effects. We present a case of a 57-year-old Hispanic man with hepatic cirrhosis due to hepatitis C and no past medical history of psychiatric illnesses who became delirious after treatment with high doses of intravenous Dexamethasone. The patient presented to Larkin Community Hospital, USA with complaints of lower back pain requiring treatment with steroids for severe lumbar central canal stenosis...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29152431/intensity-modulated-proton-therapy-with-advanced-planning-techniques-in-a-challenging-hepatocellular-carcinoma-patient
#11
Smith Apisarnthanarax, Jatinder Saini, Avril O'Ryan-Blair, Jackie Castro, Stephen R Bowen
The use of radiation therapy has been increasing over recent years for the treatment of hepatocellular carcinoma (HCC). Proton beam therapy (PBT) has emerged as a promising treatment option for HCC patients due to its dosimetric advantages of sparing more normal liver tissue from radiation at low to moderate doses compared to photon-based treatments while still delivering high doses of radiation to tumors. The PBT therapy may be particularly beneficial in high-risk HCC cirrhotic patients with large, bulky tumors and/or vascular invasion complicated by surrounding perfusion abnormalities...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29151547/-the-effect-of-reconstruction-method-on-the-ability-to-analyze-of-ffr-using-ct
#12
Hidekazu Inage, Yosuke Kogure, Kanako Kumamaru, Shinichiro Fujimoto, Kazuhisa Takamura, Yuko Kawaguchi, Htun Han Ni, Haruyoshi Hoshito
BACKGROUND: Invasive-fractional flow reserve (FFR) is the reference standard to evaluate functional ischemia of coronary arteries, and is used to decide if percutaneous transluminal coronary angioplasty is necessary. Recently, computed tomography-derived FFR (CT-FFR) is emerged as an alternative non-invasive method. OBJECTIVES: To evaluate the effect of reconstruction methods and image parameters on the accuracy of CT-FFR calculation. METHODS: A total of 26 segments in the consecutive 10 coronary CT angiography (CCTA) studies were evaluated...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29151544/-creation-and-evaluation-of-educational-programs-for-additional-delayed-scan-of-fdg-pet-ct
#13
Ryota Wada, Takashi Kamiya, Kouichi Fujino, Junpei Ueda, Kayako Isohashi, Mitsuaki Tatsumi, Jun Hatazawa
Generally, FDG-PET/CT image is acquired at the 60th minute after tracer administration. Depending on the clinical case, additional delayed scans may be useful. However, it is difficult to judge whether additional delayed scan is useful or not. The purposes of this study were creation and evaluation of educational programs to help radiological technologists to decide the usefulness of additional delayed scan of FDG-PET/CT. METHODS: Educational programs consisted of the instructional materials and the judgment test of clinical cases...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29151471/-radiochromic-hydrogel-dosimeters
#14
Shuji Usui
Radiochromic hydrogel dosimeters are a useful tool for the verification of 3D dose distributions using optical CT scanners which are lower cost and with higher spatial resolution in a limited time than MRI scanners. In this paper, recent development of radiochromic micelle gel and genipin-gelatin gel dosimeters are described. They have the advantage of water equivalency, low or no diffusion property, and lower toxicity. Micelle gels consist of leuco dye, surfactant, radical initiator (halocarbons), and gelling agent...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/29149718/coronary-risk-assessment-at-x-ray-dose-equivalent-ungated-chest-ct-results-of-a-multi-reader-study
#15
Michael Messerli, Lukas Hechelhammer, Sebastian Leschka, René Warschkow, Simon Wildermuth, Ralf W Bauer
OBJECTIVES: To determine the value of ultra-low dose chest CT with tin filtration for ordinal coronary artery calcium (CAC) risk scoring. METHODS: 50 patients were prospectively included and underwent clinical standard dose chest CT (1.8±0.7mSv) and ultra-low dose CT (0.13±0.01mSv). Four radiologists estimated presence and extent of CAC. RESULTS: Weighted kappa values for CAC were 0.76-0.97 in standard dose and 0.75-0.95 in ultra-low dose CT (p<0...
October 25, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/29148922/feasibility-and-safety-of-using-thoracic-and-lumbar-cortical-bone-trajectory-pedicle-screws-in-spinal-constructs-in-children-technical-note
#16
Jonathan N Sellin, Jeffrey S Raskin, Kristen A Staggers, Alison Brayton, Valentina Briceño, Amee J Moreno, Andrew Jea
Thoracic and lumbar cortical bone trajectory pedicle screws have been described in adult spine surgery. They have likewise been described in pediatric CT-based morphometric studies; however, clinical experience in the pediatric age group is limited. The authors here describe the use of cortical bone trajectory pedicle screws in posterior instrumented spinal fusions from the upper thoracic to the lumbar spine in 12 children. This dedicated study represents the initial use of cortical screws in pediatric spine surgery...
November 17, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29148430/low-dose-4d-cardiac-imaging-in-small-animals-using-dual-source-micro-ct
#17
Matthew Holbrook, Darin P Clark, Cristian T Badea
Micro-CT is widely used in preclinical studies, generating substantial interest in extending its capabilities in functional imaging applications such as blood perfusion and cardiac function. However, imaging cardiac structure and function in mice is challenging due to their small size and rapid heart rate. To overcome these challenges, we propose and compare improvements on two strategies for cardiac gating in dual-source, preclinical micro-CT: fast prospective gating (PG) and uncorrelated retrospective gating (RG)...
November 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29146741/presence-of-monosodium-urate-crystal-deposition-by-dual-energy-ct-in-patients-with-gout-treated-with-allopurinol
#18
Nicola Dalbeth, Savvas Nicolaou, Scott Baumgartner, Jia Hu, Maple Fung, Hyon K Choi
OBJECTIVE: Dual-energy CT (DECT) detects and quantifies monosodium urate (MSU) crystal deposition with high precision. This DECT study assessed crystal deposition in patients with gout treated with stable-dose allopurinol, and investigated potential clinical determinants for crystal deposition. METHODS: Patients with gout treated with allopurinol ≥300 mg daily for at least 3 months were prospectively recruited from the USA and New Zealand, using monitored enrolment to include approximately 25% patients with palpable tophi and approximately 50% with serum urate (sUA) levels <6...
November 16, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/29146695/first-in-human-her2-targeted-imaging-using-89-zr-pertuzumab-pet-ct-dosimetry-and-clinical-application-in-patients-with-breast-cancer
#19
Gary A Ulaner, Serge K Lyashchenko, Christopher Riedl, Shutian Ruan, Pat B Zanzonico, Diana Lake, Komal Jhaveri, Brian Zeglis, Jason S Lewis, Joseph A O'Donoghue
In this first-in-human study, we evaluate the safety and dosimetry of (89)Zr-pertuzumab PET/CT for HER2-targeted imaging in patients with HER2-postive breast cancer. Materials and Methods: Patients with HER2-positive breast cancer and evidence of distant metastases were enrolled in an Institutional Review Board (IRB)-approved prospective clinical trial. Pertuzumab was conjugated with deferoxamine and radiolabeled with (89)Zr. Patients underwent (89)Zr-pertuzumab PET/CT with 74 MBq of (89)Zr-pertuzumab in a total antibody mass of 20-50 mg of pertuzumab...
November 16, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29146103/assessment-of-the-implant-geometry-in-fractionated-interstitial-hdr-breast-brachytherapy-using-an-electromagnetic-tracking-system
#20
Markus Kellermeier, Rainer Fietkau, Vratislav Strnad, Christoph Bert
PURPOSE: During the partial-breast treatment course by interstitial brachytherapy, electromagnetic tracking (EMT) was applied to measure the implant geometry. Implant-geometry variation, choice of reference data, and three registration methods were assessed. METHODS AND MATERIALS: The implant geometry was measured in 28 patients after catheter implantation (EMTbed), during CT imaging (EMTCT), and in each of up to n = 9 treatment fractions (EMTF(k), k = 1, 2,… n)...
November 13, 2017: Brachytherapy
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