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T2 mapping

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https://www.readbyqxmd.com/read/29666996/comparison-of-t2-relaxation-values-in-subtalar-cartilage-between-patients-with-lateral-instability-of-the-ankle-joint-and-healthy-volunteers
#1
Hyun Su Kim, Young Cheol Yoon, Ki Sun Sung, Min-Ji Kim, Soohyun Ahn
PURPOSE: To evaluate the difference between T2 relaxation values of the subtalar cartilage in lateral ankle instability patients and healthy volunteers. MATERIALS AND METHODS: This institutional review board-approved study included 27 preoperative magnetic resonance imaging (MRI) examinations of 26 patients who underwent Broström operations. Data of previously enrolled healthy volunteers (12 volunteers, 13 MRIs) were used as controls. Two radiologists independently measured T2 values in eight posterior subtalar joint cartilage compartments: central calcaneus anterior (CCA) and posterior (CCP), central talus anterior (CTA) and posterior (CTP), lateral calcaneus anterior (LCA) and posterior (LCP), and lateral talus anterior (LTA) and posterior (LTP)...
April 17, 2018: European Radiology
https://www.readbyqxmd.com/read/29666952/utility-of-diffusion-weighted-mr-imaging-in-the-diagnosis-of-placenta-accreta-spectrum-abnormality
#2
Bhagya Sannananja, Anna Ellermeier, Daniel S Hippe, Thomas C Winter, Stella K Kang, Susanna I Lee, Mark R Kilgore, Manjiri K Dighe
PURPOSE: The aim of this study was to evaluate the utility of added DWI sequences as an adjunct to traditional MR imaging in the evaluation of abnormal placentation in patients with suspicion for placenta accreta spectrum abnormality or morbidly adherent placenta (MAP). MATERIALS AND METHODS: The study was approved by local ethics committee. The subjects included pregnant women with prenatal MRI performed between July 2013 to July 2015. All imaging was performed on a Philips 1...
April 17, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29666810/the-8-th-tnm-edition-for-lung-cancer-a-critical-analysis
#3
REVIEW
Paul E Van Schil, Ramon Rami-Porta, Hisao Asamura
The 8th edition of the tumor, node and metastasis (TNM) classification provides several new categories and for the first time, some prospective data are included. The T (tumor) descriptor is further subdivided with 1 cm increments for T1 and T2 disease. For metastatic disease (M descriptor) the new M1b category comprises patients with only one metastasis in one distant organ, whereas M1c implies multiple distant metastases in one or several organs. There are no changes regarding the nodal map and N component but new categories are suggested for further analysis, subdividing the N1 and N2 descriptors into involvement of single or multiple lymph node stations...
March 2018: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29666564/neural-induction-potential-and-mri-of-adscs-labeled-cationic-superparamagnetic-iron-oxide-nanoparticle-in-vitro
#4
Weiqiong Ma, Qi Xie, Baolin Zhang, Huixian Chen, Jianyi Tang, Zhengxian Lei, Minyi Wu, Dingxuan Zhang, Jiani Hu
Magnetic resonance imaging (MRI) combined with contrast agents is believed to be useful for stem cell tracking in vivo, and the aim of this research was to investigate the biosafety and neural induction of SD rat-originated adipose derived stem cells (ADSCs) using cationic superparamagnetic iron oxide (SPIO) nanoparticle which was synthesized by the improved polyol method, in order to allow visualization using in vitro MRI. The scan protocols were performed with T2-mapping sequence; meanwhile, the ultrastructure of labeled cells was observed by transmission electron microscopy (TEM) while the iron content was measured by inductively coupled plasma-atomic emission spectrometry (ICP-AES)...
2018: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29663939/brain-iron-distribution-after-multiple-doses-of-ultra-small-superparamagnetic-iron-oxide-particles-in-rats
#5
Andrew W Gorman, Kofi M Deh, Caspar M Schwiedrzik, Julie R White, Ernest Victor Groman, Clark A Fisher, Kelly M Gillen, Pascal Spincemaille, Skye Rasmussen, Martin R Prince, Henning U Voss, Winrich A Freiwald, Yi Wang
The purpose of this study is to determine the effects of high cumulative doses of ultra-small paramagnetic iron oxide (USPIO) used in neuroimaging studies. We intravenously administered 8 mg/kg of 2 USPIO compounds daily for 4 wk to male Sprague-Dawley rats (Crl:SD). Multiecho gradient-echo MRI, serum iron levels, and histology were performed at the end of dosing and after a 7-d washout period. R2* maps and quantitative susceptibility maps (QSM) were generated from multiecho gradient-echo data. R2* maps and QSM showed iron accumulation in brain ventricles on MR images acquired at the 4- and 5-wk time points...
April 2, 2018: Comparative Medicine
https://www.readbyqxmd.com/read/29663577/t2-mapping-to-characterize-intestinal-fibrosis-in-crohn-s-disease
#6
Si-Yun Huang, Xue-Hua Li, Li Huang, Can-Hui Sun, Zhuang-Nian Fang, Meng-Chen Zhang, Jin-Jiang Lin, Meng-Jie Jiang, Ren Mao, Zi-Ping Li, Zhongwei Zhang, Shi-Ting Feng
BACKGROUND: Assessing bowel fibrosis in patients with Crohn's disease (CD) has important therapeutic implications. PURPOSE: To determine the utility of T2* mapping versus that of contrast enhanced (CE) imaging in grading intestinal fibrosis in patients with CD using surgical pathology as the reference standard. STUDY TYPE: Prospective. SPECIMENS: 102 specimens from 27 patients with CD. FIELD STRENGTH/SEQUENCE: 3...
April 17, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29662912/relationship-between-quantitative-mri-biomarkers-and-patient-reported-outcome-measures-after-cartilage-repair-surgery-a-systematic-review
#7
REVIEW
Drew A Lansdown, Kevin Wang, Eric Cotter, Annabelle Davey, Brian J Cole
Background: Treatment of articular cartilage injuries remains a clinical challenge, and the optimal tools to monitor and predict clinical outcomes are unclear. Quantitative magnetic resonance imaging (qMRI) allows for a noninvasive biochemical evaluation of cartilage and may offer advantages in monitoring outcomes after cartilage repair surgery. Hypothesis: qMRI sequences will correlate with early pain and functional measures. Study Design: Systematic review; Level of evidence, 3...
April 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29662782/quantitative-analysis-of-t2-relaxation-times-of-the-patellofemoral-joint-cartilage-3-years-after-anterior-cruciate-ligament-reconstruction
#8
Chang-Wan Kim, Ali Hosseini, Lin Lin, Yang Wang, Martin Torriani, Thomas Gill, Alan J Grodzinsky, Guoan Li
Objective: To evaluate patient-specific patellofemoral joint (PFJ) cartilage 3 years postoperatively using T2 mapping magnetic resonance imaging and the uninjured contralateral side as control. Hypothesis: The cartilage of the PFJ in the anterior cruciate ligament (ACL) reconstructed knees would show increased T2 values compared to the uninjured contralateral knees at 3-year follow-up, and the femoral (trochlear) cartilage would be more susceptible than the patella in degeneration in ACL-reconstructed knees...
January 2018: Journal of Orthopaedic Translation
https://www.readbyqxmd.com/read/29653354/a-self-tuned-graph-based-framework-for-localization-and-grading-prostate-cancer-lesions-an-initial-evaluation-based-on-multiparametric-magnetic-resonance-imaging
#9
Weifu Chen, Mingquan Lin, Eli Gibson, Matthew Bastian-Jordan, Derek W Cool, Zahra Kassam, Huageng Liang, Guocan Feng, Aaron D Ward, Bernard Chiu
Multiparametric magnetic resonance imaging (mpMRI) has been established as the state-of-the-art examination for the detection and localization of prostate cancer lesions. Prostate Imaging-Reporting and Data System (PI-RADS) has been established as a scheme to standardize the reporting of mpMRI findings. Although lesion delineation and PI-RADS ratings could be performed manually, human delineation and ratings are subjective and time-consuming. In this article, we developed and validated a self-tuned graph-based model for PI-RADS rating prediction...
April 3, 2018: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29650780/differentiating-atypical-hemangiomas-and-metastatic-vertebral-lesions-the-role-of-t1-weighted-dynamic-contrast-enhanced-mri
#10
K A Morales, J Arevalo-Perez, K K Peck, A I Holodny, E Lis, S Karimi
BACKGROUND AND PURPOSE: Vertebral hemangiomas are benign vascular lesions that are almost always incidentally found in the spine. Their classic typical hyperintense appearance on T1- and T2-weighted MR images is diagnostic. Unfortunately, not all hemangiomas have the typical appearance, and they can mimic metastases on routine MR imaging. These are generally referred to as atypical hemangiomas and can result in misdiagnosis and ultimately additional imaging, biopsy, and unnecessary costs...
April 12, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29628557/intraocular-pressure-changes-during-laparoscopic-surgery-in-trendelenburg-position-in-patients-anesthetized-with-propofol-based-total-intravenous-anesthesia-compared-to-sevoflurane-anesthesia-a-comparative-study
#11
Gagandeep Kaur, Mamta Sharma, Poonam Kalra, Shobha Purohit, Kanchan Chauhan
Background: Intraocular pressure (IOP) is increased during laparoscopic surgery with Trendelenburg position and may contribute to deleterious effects on optic nerve in susceptible patients. Aims: The primary objective of this study is to compare the effects of propofol-based total intravenous anesthesia (TIVA) with those of sevoflurane anesthesia on IOP in patients undergoing lower abdominal laparoscopic surgery in Trendelenburg position. Secondary objectives are to compare hemodynamic changes, mean arterial pressure (MAP), end-tidal CO2 , and peak inspiratory pressure changes...
January 2018: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/29627781/novel-mri-of-mediastinal-masses-internal-differentiation-of-a-thymoma-and-lymphoma-with-t1-and-t2-mapping
#12
Tanvi Karnik, Rhiannon McBean, Graeme Hart, Katrina Newbigin
Routine imaging for mediastinal malignancies includes chest X-ray, CT or MRI. T1 and T2 mapping are novel MRI techniques which may have a role in expanding the assessment of internal tumour characteristics. This case report details two middle-aged women who had similar clinical presentations of mediastinal masses of comparable size and appearance when assessed with routine imaging. T1 and T2 maps were acquired on MRI to investigate whether these tumours could be further differentiated prior to surgery. T1 and T2 mapping supported suspicion for which tumour components were solid and cystic, as subsequently confirmed histologically...
April 7, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29627288/multiparametric-whole-body-mri-with-diffusion-weighted-imaging-and-adc-mapping-for-the-identification-of-visceral-and-osseous-metastases-from-solid-tumors
#13
Michael A Jacobs, Katarzyna J Macura, Atif Zaheer, Emmanuel S Antonarakis, Vered Stearns, Antonio C Wolff, Thorsten Feiweier, Ihab R Kamel, Richard L Wahl, Li Pan
RATIONALE AND OBJECTIVES: The purpose of this study was to investigate the use of multiparametric, whole-body, diffusion-weighted imaging (WB-DWI) and apparent diffusion coefficient (ADC) maps with T2 -weighted magnetic resonance imaging (MRI) at 3T for the detection and monitoring of metastatic disease in patients. MATERIALS AND METHODS: Fifty-four participants (32 healthy subjects and 22 patients) were scanned with WB-DWI methods using a 3T MRI scanner. Axial, sagittal, or coronal fat-suppressed T2 -weighted (T2 WI), T1 -weighted (T1 WI), and DWI images were acquired...
April 4, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29626267/different-ventilation-techniques-and-hemodynamic-optimization-to-maintain-regional-cerebral-oxygen-saturation-rsco-2-during-laparoscopic-bariatric-surgery-a-prospective-randomized-interventional-study
#14
Osama M Asaad
PURPOSE: The purpose of this study was to assess the changes in regional cerebral oxygen saturation (rScO2 ) in response to different ventilation strategies: inspired oxygen concentration (FiO2 ), end-tidal carbon dioxide (EtCO2 ), and positive end expiratory pressure (PEEP) in addition to optimizing mean arterial pressure (MAP) in obese patients subjected to laparoscopic bariatric surgery in the reverse trendelenburg position. METHODS: 50 obese patients were randomly assigned into one of two groups...
April 6, 2018: Journal of Anesthesia
https://www.readbyqxmd.com/read/29626258/mr-elastography-in-primary-sclerosing-cholangitis-correlating-liver-stiffness-with-bile-duct-strictures-and-parenchymal-changes
#15
Candice A Bookwalter, Sudhakar K Venkatesh, John E Eaton, Thomas D Smyrk, Richard L Ehman
AIM: To determine correlation of liver stiffness measured by MR Elastography (MRE) with biliary abnormalities on MR Cholangiopancreatography (MRCP) and MRI parenchymal features in patients with primary sclerosing cholangitis (PSC). METHODS: Fifty-five patients with PSC who underwent MRI of the liver with MRCP and MRE were retrospectively evaluated. Two board-certified abdominal radiologists in agreement reviewed the MRI, MRCP, and MRE images. The biliary tree was evaluated for stricture, dilatation, wall enhancement, and thickening at segmental duct, right main duct, left main duct, and common bile duct levels...
April 7, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29610076/predicting-ct-image-from-mri-data-through-feature-matching-with-learned-nonlinear-local-descriptors
#16
Wei Yang, Liming Zhong, Yang Chen, Liyan Lin, Zhentai Lu, Shupeng Liu, Yao Wu, Qianjin Feng, Wufan Chen
Attenuation correction for positron-emission tomography (PET)/magnetic resonance (MR) hybrid imaging systems and dose planning for MR-based radiation therapy remain challenging due to insufficient high-energy photon attenuation information. We present a novel approach that uses the learned nonlinear local descriptors and feature matching to predict pseudo computed tomography (pCT) images from T1-weighted and T2-weighted magnetic resonance imaging (MRI) data. The nonlinear local descriptors are obtained by projecting the linear descriptors into the nonlinear high-dimensional space using an explicit feature map and low-rank approximation with supervised manifold regularization...
April 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/29607528/changes-in-myocardial-iron-content-following-administration-of-intravenous-iron-myocardial-iron-study-design
#17
Gema Miñana, Ingrid Cardells, Patricia Palau, Pau Llàcer, Lorenzo Fácila, Luis Almenar, Maria Pilar López-Lereu, Jose V Monmeneu, Martina Amiguet, Jessika González, Alicia Serrano, Vicente Montagud, Raquel López-Vilella, Ernesto Valero, Sergio García-Blas, Vicent Bodí, Rafael de la Espriella-Juan, Juan Sanchis, Francisco J Chorro, Antoni Bayés-Genís, Julio Núñez
BRIEF TRIAL SUMMARY BACKGROUND: Treatment with intravenous ferric carboxymaltose (FCM) showed to improve symptoms, functional capacity, and quality of life in patients with heart failure (HF) and iron deficiency (ID). However, the underlying mechanisms for these beneficial effects remain undetermined. The aim of this study is to quantify cardiac magnetic resonance (CMR) changes in myocardial iron content after administration of intravenous FCM in patients with HF and ID and contrast them with parameters of HF severity...
April 1, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29606371/characterization-of-small-4cm-solid-renal-masses-by-computed-tomography-and-magnetic-resonance-imaging-current-evidence-and-further-development
#18
N Schieda, R S Lim, M D F McInnes, I Thomassin, R Renard-Penna, S Tavolaro, F H Cornelis
Diagnosis of renal cell carcinomas (RCC) subtypes on computed tomography (CT) and magnetic resonance imaging (MRI) is clinically important. There is increased evidence that confident imaging diagnosis is now possible while standardization of the protocols is still required. Fat-poor angiomyolipoma show homogeneously increased unenhanced attenuation, homogeneously low signal on T2-weighted MRI and apparent diffusion coefficient (ADC) map, may contain microscopic fat and are classically avidly enhancing. Papillary RCC are also typically hyperattenuating and of low signal on T2-weighted MRI and ADC map; however, their gradual progressive enhancement after intravenous administration of contrast material is a differentiating feature...
March 30, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29605590/measurement-of-fat-fraction-in-the-human-thymus-by-localized-nmr-and-three-point-dixon-mri-techniques
#19
Kenneth W Fishbein, Sokratis K Makrogiannis, Vanessa A Lukas, Marilyn Okine, Ramona Ramachandran, Luigi Ferrucci, Josephine M Egan, Chee W Chia, Richard G Spencer
PURPOSE: To develop a protocol to non-invasively measure and map fat fraction, fat/(fat+water), as a function of age in the adult thymus for future studies monitoring the effects of interventions aimed at promoting thymic rejuvenation and preservation of immunity in older adults. MATERIALS AND METHODS: Three-dimensional spoiled gradient echo 3T MRI with 3-point Dixon fat-water separation was performed at full inspiration for thymus conspicuity in 36 volunteers 19 to 56 years old...
March 29, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29605381/type-2-diabetes-patients-have-accelerated-cartilage-matrix-degeneration-compared-to-diabetes-free-controls-data-from-the-osteoarthritis-initiative
#20
Jan Neumann, Felix C Hofmann, Ursula Heilmeier, Walid Ashmeik, Kenneth Tang, Alexandra S Gersing, Benedikt J Schwaiger, Michael C Nevitt, Gabby B Joseph, Nancy E Lane, Charles E McCulloch, Thomas M Link
PURPOSE: Osteoarthritis (OA) and diabetes mellitus (DM) share common risk factors with a potential underlying relationship between both diseases. The purpose of this study was to investigate the longitudinal effects of DM on cartilage deterioration over 24-months with MR-based T2 relaxation time measurements. METHODS: From the Osteoarthritis Initiative cohort 196 diabetics were matched in small sets for age, sex, BMI and Kellgren-Lawrence score with 196 non-diabetic controls...
March 29, 2018: Osteoarthritis and Cartilage
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