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https://www.readbyqxmd.com/read/29676964/advanced-imaging-techniques-in-evaluation-of-colorectal-cancer
#1
Roberto García-Figueiras, Sandra Baleato-González, Anwar R Padhani, Antonio Luna-Alcalá, Ana Marhuenda, Joan C Vilanova, Iria Osorio-Vázquez, Anxo Martínez-de-Alegría, Antonio Gómez-Caamaño
Imaging techniques are clinical decision-making tools in the evaluation of patients with colorectal cancer (CRC). The aim of this article is to discuss the potential of recent advances in imaging for diagnosis, prognosis, therapy planning, and assessment of response to treatment of CRC. Recent developments and new clinical applications of conventional imaging techniques such as virtual colonoscopy, dual-energy spectral computed tomography, elastography, advanced computing techniques (including volumetric rendering techniques and machine learning), magnetic resonance (MR) imaging-based magnetization transfer, and new liver imaging techniques, which may offer additional clinical information in patients with CRC, are summarized...
April 20, 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29676682/growth-and-alignment-of-the-pediatric-subaxial-cervical-spine-following-rigid-instrumentation-and-fusion-a-multicenter-study-of-the-pediatric-craniocervical-society
#2
Hannah E Goldstein, Justin A Neira, Matei Banu, Philipp R Aldana, Bruno P Braga, Douglas L Brockmeyer, Michael L DiLuna, Daniel H Fulkerson, Todd C Hankinson, Andrew H Jea, Sean M Lew, David D Limbrick, Jonathan Martin, Joshua M Pahys, Luis F Rodriguez, Curtis J Rozzelle, Gerald F Tuite, Nicholas M Wetjen, Richard C E Anderson
OBJECTIVE The long-term effects of surgical fusion on the growing subaxial cervical spine are largely unknown. Recent cross-sectional studies have demonstrated that there is continued growth of the cervical spine through the teenage years. The purpose of this multicenter study was to determine the effects of rigid instrumentation and fusion on the growing subaxial cervical spine by investigating vertical growth, cervical alignment, cervical curvature, and adjacent-segment instability over time. METHODS A total of 15 centers participated in this multi-institutional retrospective study...
April 20, 2018: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29676238/effect-of-cyp2d6-poor-metabolizer-phenotype-on-stereoselective-nebivolol-pharmacokinetics
#3
Carolina P Vieira, Daniel V Neves, Eduardo B Coelho, Vera Lucia Lanchote
BACKGROUND: Nebivolol is a drug available as a racemate of d-nebivolol (SRRR) and l-nebivolol (RSSS). In human liver microsomes CYP2D6 mainly catalyses the metabolism of l-nebivolol, while CYP2C19 catalyses the metabolism of d-nebivolol. Nebivolol stereoselective pharmacokinetics has been described only for extensive metabolizers (EM). OBJECTIVE: To describe the stereoseletive nebivolol pharmacokinetics in CYP2D6 poor metabolizers (PM) and to assess whether the phenotype has an impact on nebivolol pharmacokinetics ...
April 19, 2018: Drug Metabolism Letters
https://www.readbyqxmd.com/read/29676043/mitral-valve-interventions-in-heart-failure
#4
REVIEW
Daniel Lavall, Andreas Hagendorff, Stephan H Schirmer, Michael Böhm, Michael A Borger, Ulrich Laufs
Secondary mitral regurgitation (MR) results from left ventricular dilatation and dysfunction. Quantification of secondary MR is challenging because of the underlying myocardial disease. Clinical and echocardiographic evaluation requires a multi-parametric approach. Severe secondary MR occurs in up to one-fourth of patients with heart failure with reduced ejection fraction, which is associated with a mortality rate of 40% to 50% in 3 years. Percutaneous edge-to-edge mitral valve repair (MitraClip) has emerged as an alternative to surgical valve repair to improve symptoms, functional capacity, heart failure hospitalizations, and cardiac haemodynamics...
April 19, 2018: ESC Heart Failure
https://www.readbyqxmd.com/read/29675944/advanced-mr-diffusion-imaging-and-chemotherapy-related-changes-in-cerebral-white-matter-microstructure-of-survivors-of-childhood-bone-and-soft-tissue-sarcoma
#5
Charlotte Sleurs, Jurgen Lemiere, Daan Christiaens, Thibo Billiet, Ronald Peeters, Stefan Sunaert, Anne Uyttebroeck, Sabine Deprez
With the increase of survival rates of pediatric cancer patients, the number of children facing potential cognitive sequelae has grown. Previous adult studies suggest that white matter (WM) microstructural changes may contribute to cognitive impairment. This study aims to investigate WM microstructure in childhood bone and soft tissue sarcoma. Differences in (micro-)structure can be investigated using diffusion MRI (dMRI). The typically used diffusion tensor model (DTI) assumes Gaussian diffusion, and lacks information about fiber populations...
April 20, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29675900/virus-inspired-nanogenes-free-from-man-made-materials-for-host-specific-transfection-and-bio-aided-mr-imaging
#6
Jing-Yi Zhu, Ming-Kang Zhang, Xian-Guang Ding, Wen-Xiu Qiu, Wu-Yang Yu, Jun Feng, Xian-Zheng Zhang
Many viruses have a lipid envelope derived from the host cell membrane that contributes much to the host specificity and the cellular invasion. This study puts forward a virus-inspired technology that allows targeted genetic delivery free from man-made materials. Genetic therapeutics, metal ions, and biologically derived cell membranes are nanointegrated. Vulnerable genetic therapeutics contained in the formed "nanogene" can be well protected from unwanted attacks by blood components and enzymes. The surface envelope composed of cancer cell membrane fragments enables host-specific targeting of the nanogene to the source cancer cells and homologous tumors while effectively inhibiting recognition by macrophages...
April 20, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29675756/nodular-macroregenerative-tissue-as-a-pattern-of-regeneration-in-cholangiopathic-disorders
#7
Preston Roberts, Andrew T Trout, Jonathan R Dillman
BACKGROUND: Published case series have described central hepatic macroregenerative nodules or masses as a common feature of Alagille syndrome. Our experience suggests this regenerative pattern can be seen more generally in cholangiopathic disorders. OBJECTIVE: To define the frequency of central regenerative tissue in Alagille syndrome and other cholangiopathic disorders and to describe the typical appearance of such regenerative tissue. MATERIALS AND METHODS: We conducted a retrospective study of CT and MR imaging performed in children and young adults with cholangiopathic disorders between January 2000 and June 2016...
April 19, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29675413/influence-of-the-size-and-curvedness-of-neural-projections-on-the-orientationally-averaged-diffusion-mr-signal
#8
Evren Özarslan, Cem Yolcu, Magnus Herberthson, Hans Knutsson, Carl-Fredrik Westin
Neuronal and glial projections can be envisioned to be tubes of infinitesimal diameter as far as diffusion magnetic resonance (MR) measurements via clinical scanners are concerned. Recent experimental studies indicate that the decay of the orientationally-averaged signal in white-matter may be characterized by the power-law, Ē ( q ) ∝ q -1 , where q is the wavenumber determined by the parameters of the pulsed field gradient measurements. One particular study by McKinnon et al . [1] reports a distinctively faster decay in gray-matter...
2018: Frontiers in Physics
https://www.readbyqxmd.com/read/29675365/mesenteric-infantile-hemangioma-diagnostic-work-up
#9
Francesco Esposito, Marco Di Serafino, Rosa Severino, Zukhra Vafina, Dolores Ferrara, Massimo Zeccolini
A very rare localization of infantile hemangioma (IH) is mesentery. It may manifest with intra-luminal or intra-peritoneal bleeding. Here there is the case of a 45-day-old infant, presenting with anemia and poor growth, subsequently referred to an uncommon hemangioma of the mesentery. As well as for most of IH, conservative treatment with only propranolol resulted in the disappearance of the lesion. Here we analyze ultrasound and magnetic resonance (MR) features of this uncommon lesion, trying to underline main characteristics at imaging in order to monitor the response to therapy...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29675360/deep-infiltrating-endometriosis-mr-imaging-with-surgical-correlation
#10
REVIEW
Xue Tang, Rennan Ling, Jingshan Gong, Dongdong Mei, Yan Luo, Minge Li, Jianmin Xu, Liguo Ma
In this pictorial review, MR imaging findings of deep infiltrating endometriosis (DIE) are illustrated together with surgical correlation. DIE can appear as irregular nodules or plaques with similar signal intensity to muscle on both T1-weighted and T2-weighted images. Hemorrhage foci and strands or stellate margins are also often noted. Restriction of diffusion can be seen on diffusion-weighted image. Fibrosis and adhesions often result in morphologic changes, such as alimentary tract tortuosity, irregular or nodular thickening of uterosacral ligaments, and partial or complete obliteration of the pouch of Douglas...
March 2018: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/29674616/quantifying-mri-frequency-shifts-due-to-structures-with-anisotropic-magnetic-susceptibility-using-pyrolytic-graphite-sheet
#11
Matthew J Cronin, Richard Bowtell
Magnetic susceptibility is an important source of contrast in magnetic resonance imaging (MRI), with spatial variations in the susceptibility of tissue affecting both the magnitude and phase of the measured signals. This contrast has generally been interpreted by assuming that tissues have isotropic magnetic susceptibility, but recent work has shown that the anisotropic magnetic susceptibility of ordered biological tissues, such as myelinated nerves and cardiac muscle fibers, gives rise to unexpected image contrast...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674609/pressure-induced-superconductivity-bordering-a-charge-density-wave-state-in-nbte-4-with-strong-spin-orbit-coupling
#12
Xiaojun Yang, Yonghui Zhou, Mengmeng Wang, Hua Bai, Xuliang Chen, Chao An, Ying Zhou, Qian Chen, Yupeng Li, Zhen Wang, Jian Chen, Chao Cao, Yuke Li, Yi Zhou, Zhaorong Yang, Zhu-An Xu
Transition-metal chalcogenides host various phases of matter, such as charge-density wave (CDW), superconductors, and topological insulators or semimetals. Superconductivity and its competition with CDW in low-dimensional compounds have attracted much interest and stimulated considerable research. Here we report pressure induced superconductivity in a strong spin-orbit (SO) coupled quasi-one-dimensional (1D) transition-metal chalcogenide NbTe4 , which is a CDW material under ambient pressure. With increasing pressure, the CDW transition temperature is gradually suppressed, and superconducting transition, which is fingerprinted by a steep resistivity drop, emerges at pressures above 12...
April 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29674417/value-of-quantitative-collateral-scoring-on-ct-angiography-in-patients-with-acute-ischemic-stroke
#13
A M M Boers, R Sales Barros, I G H Jansen, O A Berkhemer, L F M Beenen, B K Menon, D W J Dippel, A van der Lugt, W H van Zwam, Y B W E M Roos, R J van Oostenbrugge, C H Slump, C B L M Majoie, H A Marquering
BACKGROUND AND PURPOSE: Many studies have emphasized the relevance of collateral flow in patients presenting with acute ischemic stroke. Our aim was to evaluate the relationship of the quantitative collateral score on baseline CTA with the outcome of patients with acute ischemic stroke and test whether the timing of the CTA acquisition influences this relationship. MATERIALS AND METHODS: From the Multicenter Randomized Clinical Trial of Endovascular Treatment of Acute Ischemic Stroke in the Netherlands (MR CLEAN) data base, all baseline thin-slice CTA images of patients with acute ischemic stroke with intracranial large-vessel occlusion were retrospectively collected...
April 19, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29674414/volumetric-brain-mri-study-in-fetuses-with-congenital-heart-disease
#14
H Olshaker, R Ber, D Hoffman, E Derazne, R Achiron, E Katorza
BACKGROUND AND PURPOSE: It is well-established that a high prevalence of infants with congenital heart defects surviving to childhood have neurodevelopmental abnormalities. The etiology is not clear. In this study, we aimed to find prenatal neuroanatomic changes in fetuses with congenital heart disease to better understand the pathophysiology behind these sequelae. MATERIALS AND METHODS: A retrospective study of 46 fetal brain MR imaging scans was performed at a tertiary medical center during a 4-year period...
April 19, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29674412/comparison-of-3t-intracranial-vessel-wall-mri-sequences
#15
A Lindenholz, A A Harteveld, J J M Zwanenburg, J C W Siero, J Hendrikse
BACKGROUND AND PURPOSE: Intracranial vessel wall MR imaging plays an increasing role in diagnosing intracranial vascular diseases. For a complete assessment, pre- and postcontrast sequences are required, and including other sequences, these result in a long scan duration. Ideally, the scan time of the vessel wall sequence should be reduced. The purpose of this study was to evaluate different intracranial vessel wall sequence variants to reduce scan duration, provided an acceptable image quality can be maintained...
April 19, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29674411/sequential-apparent-diffusion-coefficient-for-assessment-of-tumor-progression-in-patients-with-low-grade-glioma
#16
I E Chen, N Swinburne, N M Tsankova, M M Hefti, A Aggarwal, A H Doshi, A Hormigo, B N Delman, K Nael
BACKGROUND AND PURPOSE: Early and accurate identification of tumor progression in patients with low-grade gliomas is challenging. We aimed to assess the role of quantitative ADC analysis in the sequential follow-up of patients with low-grade gliomas as a potential imaging marker of tumor stability or progression. MATERIALS AND METHODS: In this retrospective study, patients with a diagnosis of low-grade glioma with at least 12 months of imaging follow-up were retrospectively reviewed...
April 19, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29674235/deep-embedding-convolutional-neural-network-for-synthesizing-ct-image-from-t1-weighted-mr-image
#17
Lei Xiang, Qian Wang, Dong Nie, Lichi Zhang, Xiyao Jin, Yu Qiao, Dinggang Shen
Recently, more and more attention is drawn to the field of medical image synthesis across modalities. Among them, the synthesis of computed tomography (CT) image from T1-weighted magnetic resonance (MR) image is of great importance, although the mapping between them is highly complex due to large gaps of appearances of the two modalities. In this work, we aim to tackle this MR-to-CT synthesis task by a novel deep embedding convolutional neural network (DECNN). Specifically, we generate the feature maps from MR images, and then transform these feature maps forward through convolutional layers in the network...
March 30, 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29673106/use-of-dynamic-images-in-radiology-education-movies-of-ct-and-mri-in-the-anatomy-classroom
#18
Hye Won Jang, Chang-Seok Oh, Yeon Hyeon Choe, Dong Su Jang
Radiology education is a key component in many preclinical anatomy courses. However, the reported effectiveness of radiology education within such anatomy classrooms has varied. This study was conducted to determine if a novel educational method using dynamic images of movies of computed tomography (CT) and magnetic resonance imaging (MRI) was effective in radiology education during a preclinical anatomy course, aided by clay modeling, specific hand gestures (digit anatomy), and reports from dissection findings uploaded to the anatomy course website (digital reports)...
April 19, 2018: Anatomical Sciences Education
https://www.readbyqxmd.com/read/29672976/dual-frequency-irradiation-cest-mri-of-endogenous-bulk-mobile-proteins
#19
Steffen Goerke, Johannes Breitling, Moritz Zaiss, Johannes Windschuh, Patrick Kunz, Patrick Schuenke, Daniel Paech, Dario L Longo, Karel D Klika, Mark E Ladd, Peter Bachert
A novel MRI contrast is proposed which enables the selective detection of endogenous bulk mobile proteins in vivo. Such a non-invasive imaging technique may be of particular interest for many diseases associated with pathological alterations of protein expression, such as cancer and neurodegenerative disorders. Specificity to mobile proteins was achieved by the selective measurement of intramolecular spin diffusion and the removal of semi-solid macromolecular signal components by a correction procedure. For this purpose, the approach of chemical exchange saturation transfer (CEST) was extended to a radiofrequency (RF) irradiation scheme at two different frequency offsets (dualCEST)...
April 19, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29672879/increased-left-atrial-size-is-associated-with-higher-atrial-fibrillation-recurrence-in-patients-treated-with-anti-arrhythmic-medications
#20
Saarang Mulukutla, Andrew D Althouse, Sandeep K Jain, Samir Saba
BACKGROUND: Atrial fibrillation (AF) is highly prevalent and antiarrhythmic therapy is often used to help with rhythm control. Some common echocardiographic parameters may be useful in predicting AF recurrence among these patients. OBJECTIVES: The purpose of this study was to evaluate the association between three common echocardiographic parameters [left atrial (LA) size, left ventricular ejection fraction (LVEF), and mitral regurgitation (MR)] and AF recurrence among patients treated with anti-arrhythmic medications...
April 19, 2018: Clinical Cardiology
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