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https://www.readbyqxmd.com/read/29244853/limited-detection-of-small-%C3%A2-10-mm-colorectal-liver-metastasis-at-preoperative-ct-in-patients-undergoing-liver-resection
#1
Yousun Ko, Jihang Kim, Joseph Kyu-Hyung Park, Haeryoung Kim, Jai Young Cho, Sung-Bum Kang, Soyeon Ahn, Kyong Joon Lee, Kyoung Ho Lee
OBJECTIVE: To retrospectively determine the sensitivity of preoperative CT in the detection of small (≤ 10 mm) colorectal liver metastasis (CRLM) nodules in patients undergoing liver resection. METHODS: The institutional review board approved the study and waived informed consent. We included 461 pathologically confirmed CRLM nodules in 211 patients (including 71 women; mean age, 66.4 years) who underwent 229 liver resections following abdominal CT. Prior to 163 resections, gadoxetic acid-enhanced liver MR imaging was also performed...
2017: PloS One
https://www.readbyqxmd.com/read/29244617/differentiation-of-high-grade-from-low-grade-astrocytoma-improvement-in-diagnostic-accuracy-and-reliability-of-pharmacokinetic-parameters-from-dce-mr-imaging-by-using-arterial-input-functions-obtained-from-dsc-mr-imaging
#2
Sung-Hye You, Seung Hong Choi, Tae Min Kim, Chul-Kee Park, Sung-Hye Park, Jae-Kyung Won, Il Han Kim, Soon Tae Lee, Hye Jeong Choi, Roh-Eul Yoo, Koung Mi Kang, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn
Purpose To evaluate whether arterial input functions (AIFs) derived from dynamic susceptibility-contrast (DSC) magnetic resonance (MR) imaging, or AIFDSC values, improve diagnostic accuracy and reliability of the pharmacokinetic (PK) parameters of dynamic contrast material-enhanced (DCE) MR imaging for differentiating high-grade from low-grade astrocytomas, compared with AIFs obtained from DCE MR imaging (AIFDCE). Materials and Methods This retrospective study included 226 patients (138 men, 88 women; mean age, 52...
December 15, 2017: Radiology
https://www.readbyqxmd.com/read/29243997/transdural-approach-to-resection-of-retro-odontoid-cysts-in-elderly-patients-report-of-3-cases
#3
Karthik Madhavan, Lee Onn Chieng, Brandon G Gaynor, Allan D Levi
Retro-odontoid cysts that arise from the tectorial membrane are uncommon lesions that can occur in elderly patients. They arise secondary to degenerative changes, including calcium pyrophosphate deposition within the ligaments. Surgical treatment is indicated when these lesions result in intractable pain, instability, and/or myelopathy. Several surgical techniques to treat this condition exist, but the optimal approach in elderly patients with comorbidities remains controversial. Here, the authors present a case series of 3 patients who underwent successful resection of a retro-odontoid lesion performed through a transdural approach...
December 15, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29243974/pediatric-cerebral-venous-sinus-thrombosis-or-compression-in-the-setting-of-skull-fractures-from-blunt-head-trauma
#4
David S Hersh, Nir Shimony, Mari L Groves, Gerald F Tuite, George I Jallo, Ann Liu, Tomas Garzon-Muvdi, Thierry A G M Huisman, Ryan J Felling, Joseph A Kufera, Edward S Ahn
OBJECTIVE Pediatric cerebral venous sinus thrombosis has been previously described in the setting of blunt head trauma; however, the population demographics, risk factors for thrombosis, and the risks and benefits of detection and treatment in this patient population are poorly defined. Furthermore, few reports differentiate between different forms of sinus pathology. A series of pediatric patients with skull fractures who underwent venous imaging and were diagnosed with intrinsic cerebral venous sinus thrombosis or extrinsic sinus compression is presented...
December 15, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29243713/the-gdc-a-law-unto-itself
#5
M Armstrong, P Ward
The following two pieces are published here to help highlight the parlous state of affairs between the British Dental Association ([BDA] the dental profession) and its regulator, the General Dental Council (GDC). The first piece by Mick Armstrong details the background to one of the letters he sent to Mr William Moyes, Chair of the GDC and provides a link to rest of the lengthy correspondence. The second piece by BDA Chief Executive Peter Ward questions how autonomous the GDC can actually be under the law and asks whether such a body is in fact acting without the law...
December 15, 2017: British Dental Journal
https://www.readbyqxmd.com/read/29243669/simultaneous-tumor-and-surrogate-motion-tracking-with-dynamic-mri-for-radiation-therapy-planning
#6
Seyoun Park, Rana Farah, Steven M Shea, Erik J Tryggestad, Russell Hales, Junghoon Lee
Respiration-induced tumor motion is a major obstacle for achieving high-precision radiotherapy of cancers in the thoracic and abdominal regions. Surrogate-based estimation and tracking methods are commonly used in radiotherapy, but with limited understanding of quantified correlation to tumor motion. In this study, we propose a method to simultaneously track the lung tumor and external surrogates to evaluate their spatial correlation in a quantitative way using dynamic MRI, which allows real-time acquisition without ionizing radiation exposure...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29243665/anthropomorphic-thorax-phantom-for-cardio-respiratory-motion-simulation-in-tomographic-imaging
#7
Konstantin Bolwin, Björn Czekalla, Lynn Johann Frohwein, Florian Buther, Klaus P Schäfers
Patient motion during medical imaging using techniques such as computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), or single emission computed tomography (SPECT) is well known to degrade images leading to blurring effects or severe artifacts. Motion correction methods try to overcome this degrading effects. However, they need to be validated under realistic conditions. In the present work, a sophisticated anthropomorphic thorax phantom is presented that combines several aspects of a simulator for cardio-respiratory motion...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29243295/extended-phase-graph-formalism-for-systems-with-magnetization-transfer-and-exchange
#8
Shaihan J Malik, Rui Pedro A G Teixeira, Joseph V Hajnal
PURPOSE: An extended phase graph framework (EPG-X) for modeling systems with exchange or magnetization transfer (MT) is proposed. THEORY: EPG-X models coupled two-compartment systems by describing each compartment with separate phase graphs that exchange during evolution periods. There are two variants: EPG-X(BM) for systems governed by the Bloch-McConnell equations, and EPG-X(MT) for the pulsed MT formalism. For the MT case, the "bound" protons have no transverse components, so their phase graph consists of only longitudinal states...
December 15, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29242976/a-rare-case-of-concomitant-cervical-disc-herniation-and-intradural-meningioma-treated-with-one-stage-posterior-surgery
#9
Xiaojian Hu, Zhong Chen, Yue Wang
STUDY DESIGN: Case report. PURPOSE: To present a rare case of cervical disc herniation concomitant with intradural meningioma which was successfully treated using a single one-stage posterior surgery of tumor resection and transdural discectomy. Coexistence of symptomatic disc herniation and intra-spinal tumor in the same cervical segment is extremely rare. Usually, two-stage anterior and posterior surgeries are needed to treat two conditions, respectively. One-stage posterior surgery to treat two pathologies simultaneously has not been reported in the literature...
December 14, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29242748/optimization-of-prostate-mri-acquisition-and-post-processing-protocol-a-pictorial-review-with-access-to-acquisition-protocols
#10
REVIEW
Ivan Jambor
The aim of this review article is to provide insight into the optimization of 1.5-Testla (T) and 3-T prostate magnetic resonance imaging (MRI). An approach for optimization of data quantification, especially diffusion-weighted imaging (DWI), is provided. Benefits and limitations of various pulse sequences are discussed. Importable MRI protocols and access to imaging datasets is provided. Careful optimization of prostate MR acquisition protocol allows the acquisition of high-quality prostate MRI using clinical 1...
December 2017: Acta Radiologica Open
https://www.readbyqxmd.com/read/29242365/improved-precision-of-automatic-brain-volume-measurements-in-patients-with-clinically-isolated-syndrome-and-multiple-sclerosis-using-edema-correction
#11
J B M Warntjes, A Tisell, I Håkansson, P Lundberg, J Ernerudh
BACKGROUND AND PURPOSE: The presence of edema will result in increased brain volume, which may obscure progressing brain atrophy. Similarly, treatment-induced edema reduction may appear as accelerated brain tissue loss (pseudoatrophy). The purpose of this study was to correlate brain tissue properties to brain volume, to investigate the possibilities for edema correction and the resulting improvement of the precision of automated brain volume measurements. MATERIALS AND METHODS: A group of 38 patients with clinically isolated syndrome or newly diagnosed MS were imaged at inclusion and after 1, 2, and 4 years using an MR quantification sequence...
December 14, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29242364/optimal-fat-suppression-in-head-and-neck-mri-comparison-of-multipoint-dixon-with-2-different-fat-suppression-techniques-spectral-presaturation-and-inversion-recovery-and-stir
#12
S Gaddikeri, M Mossa-Basha, J B Andre, D S Hippe, Y Anzai
BACKGROUND AND PURPOSE: Uniform complete fat suppression is essential for identification and characterization of most head and pathology. Our aim was to compare the multipoint Dixon turbo spin-echo fat-suppression technique with 2 different fat-suppression techniques, including a hybrid spectral presaturation with inversion recovery technique and an inversion recovery STIR technique, in head and neck fat-suppression MR imaging. MATERIALS AND METHODS: Head and neck MR imaging datasets of 72 consecutive patients were retrospectively reviewed...
December 14, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29242363/diagnostic-accuracy-of-amino-acid-and-fdg-pet-in-differentiating-brain-metastasis-recurrence-from-radionecrosis-after-radiotherapy-a-systematic-review-and-meta-analysis
#13
H Li, L Deng, H X Bai, J Sun, Y Cao, Y Tao, L J States, M D Farwell, P Zhang, B Xiao, L Yang
BACKGROUND: Current studies that analyze the usefulness of amino acid and FDG-PET in distinguishing brain metastasis recurrence and radionecrosis after radiation therapy are limited by small cohort size. PURPOSE: Our aim was to assess the diagnostic accuracy of amino acid and FDG-PET in differentiating brain metastasis recurrence from radionecrosis after radiation therapy. DATA SOURCES: Studies were retrieved from PubMed, Embase, and the Cochrane Library...
December 14, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29242240/persistence-of-infarct-zone-t2-hyperintensity-at-6-months-after-acute-st-segment-elevation-myocardial-infarction-incidence-pathophysiology-and-prognostic-implications
#14
Jaclyn Carberry, David Carrick, Caroline Haig, Nadeem Ahmed, Ify Mordi, Margaret McEntegart, Mark C Petrie, Hany Eteiba, Stuart Hood, Stuart Watkins, Mitchell Lindsay, Andrew Davie, Ahmed Mahrous, Ian Ford, Naveed Sattar, Paul Welsh, Aleksandra Radjenovic, Keith G Oldroyd, Colin Berry
BACKGROUND: The incidence and clinical significance of persistent T2 hyperintensity after acute ST-segment-elevation myocardial infarction (STEMI) is uncertain. METHODS AND RESULTS: Patients who sustained an acute STEMI were enrolled in a cohort study (BHF MR-MI: NCT02072850). Two hundred eighty-three STEMI patients (mean age, 59±12 years; 75% male) had cardiac magnetic resonance with T2 mapping performed at 2 days and 6 months post-STEMI. Persisting T2 hyperintensity was defined as infarct T2 >2 SDs from remote T2 at 6 months...
December 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29241125/the-enhancement-and-inhibition-of-mercury-reduction-by-natural-organic-matter-in-the-presence-of-shewanella-oneidensis-mr-1
#15
Seyong Lee, Dong-Hun Kim, Kyoung-Woong Kim
Reduction-oxidation (Redox) processes of mercury (Hg) are of significant importance in influencing Hg speciation, bioavailability, and fate in anoxic environments where natural organic matter (NOM) and dissimilatory metal reducing bacteria (DMRB) are widely observed. However, the redox reaction between Hg and NOM, has not yet been studied in the presence of S. oneidensis MR-1 in anoxic environments. We have found that the reduction rate of mercuric mercury [Hg(II)] in the presence of Elliott soil humic acid (ESHA) was 0...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241086/practical-aspects-of-the-automated-preparation-of-aqueous-two-phase-systems-for-the-analysis-of-biological-macromolecules
#16
Rana Hameed, Jonathan Huddleston, Svetlana Ignatova
A robust strategy for the automated preparation of aqueous two-phase systems (ATPS) using a liquid handling sample processor was developed using gravimetric methods: to determine the accuracy of preparation. The major robotic control parameters requiring adjustment were; speed of aspiration and dispense; delay times following aspiration and dispense alongside measures to control cross-contamination during phase sampling. In general mixture compositions of both polymer/polymer and polymer/salt mixtures could be prepared with a target bias accuracy of less than 5%...
October 3, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29239712/multiparametric-mr-imaging-of-age-related-changes-in-healthy-thigh-muscles
#17
Min A Yoon, Suk-Joo Hong, Min Cheol Ku, Chang Ho Kang, Kyung-Sik Ahn, Baek Hyun Kim
Purpose To use multiparametric magnetic resonance (MR) imaging to assess for and establish age-related differences in healthy thigh muscles. Materials and Methods Ninety-five subjects (47 men, 48 women; median age, 47 years) with healthy body mass index were grouped according to age: 30-39 years (n = 25), 40-49 years (n = 25), 50-59 years (n = 25), and 60-69 years (n = 20). Multiparametric MR imaging (intravoxel incoherent motion diffusion-weighted, diffusion-tensor, multiecho Dixon, and dynamic contrast material-enhanced MR imaging) was performed at 3...
December 14, 2017: Radiology
https://www.readbyqxmd.com/read/29239710/liver-fibrosis-deep-convolutional-neural-network-for-staging-by-using-gadoxetic-acid-enhanced-hepatobiliary-phase-mr-images
#18
Koichiro Yasaka, Hiroyuki Akai, Akira Kunimatsu, Osamu Abe, Shigeru Kiryu
Purpose To investigate the performance of a deep convolutional neural network (DCNN) model in the staging of liver fibrosis using gadoxetic acid-enhanced hepatobiliary phase magnetic resonance (MR) imaging. Materials and Methods This retrospective study included patients for whom input data (hepatobiliary phase MR images, static magnetic field of the imaging unit, and hepatitis B and C virus testing results available, either positive or negative) and reference standard data (liver fibrosis stage evaluated from biopsy or surgical specimens obtained within 6 months of the MR examinations) were available were assigned to the training (534 patients) or the test (100 patients) group...
December 14, 2017: Radiology
https://www.readbyqxmd.com/read/29239394/quantitative-mr-image-analysis-for-brian-tumor
#19
Zeina A Shboul, Sayed M S Reza, Khan M Iftekharuddin
This paper presents an integrated quantitative MR image analysis framework to include all necessary steps such as MRI inhomogeneity correction, feature extraction, multiclass feature selection and multimodality abnormal brain tissue segmentation respectively. We first obtain mathematical algorithm to compute a novel Generalized multifractional Brownian motion (GmBm) texture feature. We then demonstrate efficacy of multiple multiresolution texture features including regular fractal dimension (FD) texture, and stochastic texture such as multifractional Brownian motion (mBm) and GmBm features for robust tumor and other abnormal tissue segmentation in brain MRI...
2018: VipIMAGE 2017 (2017)
https://www.readbyqxmd.com/read/29239261/white-matter-tract-integrity-an-indicator-of-axonal-pathology-after-mild-traumatic-brain-injury
#20
Sohae Chung, Els Fieremans, Xiuyuan Wang, Nuri E Kucukboyaci, Charles J Morton, James S Babb, Prin Amorapanth, Farng-Yang Foo, Dmitry S Novikov, Steven R Flanagan, Joseph F Rath, Yvonne W Lui
We seek to elucidate the underlying pathophysiology of injury sustained after mild traumatic brain injury (MTBI) using multi-shell diffusion MRI, deriving compartment-specific WM tract integrity (WMTI) metrics. WMTI allows a more biophysical interpretation of WM changes by describing microstructural characteristics in both intra- and extra-axonal environments. Thirty-two patients with MTBI within 30 days of injury and twenty-one age- and sex-matched controls were imaged on a 3T MR scanner. Multi-shell diffusion acquisition was performed with 5 b-values (250 - 2500 s/mm<sup>2</sup>) along 6 - 60 diffusion encoding directions...
December 14, 2017: Journal of Neurotrauma
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