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https://www.readbyqxmd.com/read/28227939/effects-of-coplanar-shielding-for-high-field-mri
#1
Joseph V Rispoli, Matthew D Wilcox, Samantha By, Steven M Wright, Mary P McDougall, Joseph V Rispoli, Matthew D Wilcox, Samantha By, Steven M Wright, Mary P McDougall, Matthew D Wilcox, Steven M Wright, Samantha By, Mary P McDougall, Joseph V Rispoli
This work investigates the efficacy of "coplanar shielding," in which copper shields are oriented concentric and coplanar to the RF coils rather than implemented as a full ground plane behind them. Following FDTD simulations to determine optimal shielding parameters, two coil geometries were constructed: a circular loop surface coil and a half-volume five-element receive array. Each was evaluated using bench measurements with and without coplanar shielding. Imaging, including accelerated SENSE imaging, was performed with the shielded and unshielded receive arrays on a whole-body 7T scanner...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225831/whole-body-staging-of-female-patients-with-recurrent-pelvic-malignancies-ultra-fast-18f-fdg-pet-mri-compared-to-18f-fdg-pet-ct-and-ct
#2
Julian Kirchner, Lino Morris Sawicki, Saravanabavaan Suntharalingam, Johannes Grueneisen, Verena Ruhlmann, Bahriye Aktas, Cornelius Deuschl, Ken Herrmann, Gerald Antoch, Michael Forsting, Lale Umutlu
OBJECTIVES: To evaluate the diagnostic feasibility of an ultra-fast 18F-FDG PET/MRI protocol, including T2-w and contrast-enhanced T1-w imaging as well as metabolic assessment (PET) in comparison to 18F-FDG PET/CT and CT for whole-body staging of female patients with suspected recurrence of pelvic malignancies. METHODS: 43 female patients with suspected tumor recurrence were included in this study. Suspicion was based on clinical follow-up and abnormal findings on imaging follow-up...
2017: PloS One
https://www.readbyqxmd.com/read/28219360/interobserver-and-intraobserver-agreement-of-ligamentous-injuries-on-conventional-mri-after-simple-elbow-dislocation
#3
Marc Schnetzke, Svenja Schüler, Johannes Hoffend, Rainer Simon, Holger Keil, Felix Porschke, Stefan Studier-Fischer, Paul-Alfred Grützner, Thorsten Guehring
BACKGROUND: The primary objective of this study was to assess the interobserver and intraobserver agreement on ligamentous injuries on conventional magnetic resonance imaging (MRI) in acute simple elbow dislocation. The secondary objectives were to determine the interobserver agreement on the assessment of joint congruity, joint effusion, loose bodies and chondral lesions on conventional MRI. METHODS: Conventional MRIs (1.5 Tesla, elbow specific surface coil) of 30 patients (40...
February 20, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28216327/combined-whole-body-and-multi-parametric-prostate-mri-as-a-single-step-approach-for-the-simultaneous-assessment-of-local-recurrence-and-metastatic-disease-after-radical-prostatectomy
#4
Nicola L Robertson, Evis Sala, Matthias Benz, Jonathan Landa, Peter Scardino, Howard I Scher, Hedvig Hricak, Hebert A Vargas
PURPOSE: To report our initial experience using "whole body and dedicated prostate (WB+P)" MRI as a single exam for the assessment of local recurrence and metastatic disease in patients with suspected recurrent prostate cancer (PCa) after radical prostatectomy (RP). MATERIALS AND METHODS: IRB-approved retrospective single-center study. 76 consecutive patients with clinically suspected recurrent PCa following RP underwent combined WB+P-MRI in a single session (10/2014-01/2016)...
February 16, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28210985/lumbar-disc-degeneration-was-not-related-to-spine-and-hip-bone-mineral-densities-in-chinese-facet-joint-osteoarthritis-may-confound-the-association
#5
Jianjiang Pan, Xuan Lu, Ge Yang, Yongmei Han, Xiang Tong, Yue Wang
: A sample of 512 Chinese was studied and we observed that greater disc degeneration on MRI was associated with greater spine DXA BMD. Yet, this association may be confounded by facet joint osteoarthritis. BMD may not be a risk factor for lumbar disc degeneration in Chinese. PURPOSE: Evidence suggested that lumbar vertebral bone and intervertebral disc interact with each other in multiple ways. The current paper aims to determine the association between bone mineral density (BMD) and lumbar disc degeneration using a sample of Chinese...
December 2017: Archives of Osteoporosis
https://www.readbyqxmd.com/read/28199729/spectrum-of-disease-associated-with-partial-lipodystrophy-pl-lessons-from-a-trial-cohort
#6
Nevin Ajluni, Rasimcan Meral, Adam H Neidert, Graham F Brady, Eric Buras, Barbara McKenna, Frank DiPaola, Thomas L Chenevert, Jeffrey F Horowitz, Colleen Buggs-Saxton, Amit R Rupani, Peedikayil E Thomas, Marwan K Tayeh, Jeffrey W Innis, M Bishr Omary, Hari Conjeevaram, Elif A Oral
CONTEXT: Partial lipodystrophy (PL) is associated with metabolic co-morbidities but may go undiagnosed as the disease spectrum is not fully described. OBJECTIVE: Define disease spectrum in PL using genetic, clinical (historical, morphometric) and laboratory characteristics. DESIGN: Cross-sectional evaluation. PARTICIPANTS: 23 patients (22 with familial, one acquired, 78.3% female, aged 12-64 years) with PL and non-alcoholic fatty liver disease (NAFLD)...
February 15, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28195345/in-vivo-measurements-of-human-neck-skin-elasticity-using-mri-and-finite-element-modeling
#7
Yunqiang An, Changjin Ji, Yong Li, Jianxia Wang, Xinyue Zhang, Yaqi Huang
PURPOSE: The assessment of mechanical properties of the human skin is very important in investigating the mechanism of obstructive sleep apnea, a common disorder characterized by repetitive collapse and obstruction of the upper airway during sleep. In this study, a unique method, combining magnetic resonance imaging (MRI) and finite element modeling (FEM), was developed to obtain the value of the in vivo elastic modulus of the neck skin. MEHTHOD: A total of 22 subjects, 16 males and 6 females, were recruited to participate in the MRI studies...
February 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/28194524/painful-schmorl-s-nodes-treated-by-discography-and-discoblock
#8
Junhui Liu, Lu Hao, Xuyang Zhang, Zhi Shan, Shengyun Li, Shunwu Fan, Fengdong Zhao
PURPOSE: To determine the efficacy of discography and discoblock in the treatment of low back pain (LBP) associated with painful Schmorl's nodes (SNs). METHODS: Between January 2010 and February 2015, 46 patients were studied who had LBP suspected to be secondary to SNs. There were 34 men and 12 women, and mean age was 54.2 years (range 42-68 years). All patients underwent provocation discography, and discoblock was given to positive patients (confirmed to have painful SNs)...
February 13, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28190854/evaluation-of-diffusion-weighted-mr-imaging-as-a-technique-for-detecting-bone-marrow-edema-in-patients-with-osteitis-pubis
#9
Iclal Erdem Toslak, Bulent Cekic, Aysen Turk, Ali Eraslan, A Eda Parlak
PURPOSE: Our aims were to determine the feasibility of diffusion-weighted magnetic resonance imaging (DWI) in the detection of bone marrow edema (BME) and explore the apparent diffusion coefficient (ADC) alterations in patients with osteitis pubis (OP). MATERIALS AND METHODS: Fourty two consecutive patients clinically suspected to have athletic pubalgia and 31 control subjects were enrolled in the study. All subjects underwent diagnostic focused magnetic resonance imaging (MRI) and DWI at b values of 0 and 600 s/mm(2)...
February 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28180981/does-pre-operative-magnetic-resonance-imaging-of-the-lumbar-multifidus-muscle-predict-clinical-outcomes-following-lumbar-spinal-decompression-for-symptomatic-spinal-stenosis
#10
Mario G T Zotti, F Vilas Boas, T Clifton, M Piche, W W Yoon, B J C Freeman
PURPOSE: To investigate whether pre-operative magnetic resonance imaging (MRI) of the lumbar multifidus muscle (LMM) would predict clinical outcomes following lumbar spinal decompression for symptomatic spinal stenosis. METHODS: A prospective cohort of patients with symptomatic neurogenic claudication, documented spinal stenosis on pre-operative MRI underwent spinal decompression. All subjects completed standardised outcome measures (Core Outcome Measures Index (COMI), Oswestry Disability Index (ODI v2...
February 8, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28176489/thigh-muscle-specific-strength-and-the-risk-of-incident-knee-osteoarthritis-the-influence-of-sex-and-greater-body-mass-index
#11
Adam G Culvenor, David T Felson, Jingbo Niu, Wolfgang Wirth, Martina Sattler, Torben Dannhauer, Felix Eckstein
OBJECTIVE: To determine whether lower thigh muscle specific strength increases risk of incident radiographic knee osteoarthritis (RKOA), and whether there exists a sex-specific relationship between thigh muscle specific strength and BMI. METHODS: 161 Osteoarthritis Initiative participants (62% female) with incident RKOA (Kellgren-Lawrence grade 0/1 at baseline, developing an osteophyte and joint space narrowing grade ≥1 by year 4) were matched to 186 controls (58% female) without incident RKOA...
February 8, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28173727/differentiation-of-ductal-carcinoma-in-situ-versus-fibrocystic-changes-by-magnetic-resonance-imaging-are-there-pathognomonic-imaging-features
#12
Matthias Dietzel, Clemens G Kaiser, Evelyn Wenkel, Paola Clauser, Michael Uder, Rüdiger Schulz-Wendtland, Pascal At Baltzer
Background In breast magnetic resonance imaging (MRI), the diagnosis of ductal carcinoma in situ (DCIS) remains controversial; the most challenging cause of false-positive DCIS diagnosis is fibrocystic changes (FC). Purpose To search for typical and pathognomonic patterns of DCIS and FC using a standard clinical MRI protocol. Material and Methods Consecutive patients scheduled for breast MRI (standardized protocols @ 1.5T: dynamic-T1-GRE before/after Gd-DTPA [0.1 mmol/kg body weight (BW)]; T1-TSE), with subsequent pathological sampling, were investigated...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28171798/distribution-of-bupivacaine-hydrochloride-after-sciatic-and-femoral-nerve-blocks-in-cats-a-magnetic-resonance-imaging-study
#13
Marina C Evangelista, Julie de Lassalle, Christine Chevrier, Eric N Carmel, Denise T Fantoni, Paulo V M Steagall
The objective of this study was to evaluate the distribution of bupivacaine hydrochloride using magnetic resonance imaging (MRI) after electrical nerve stimulator (ENS)-guided sciatic (ScN) and femoral (FN) nerve blocks in cats. Six adult cats (body weight 4.8±0.6kg) were anesthetized with acepromazine-buprenorphine-propofol-isoflurane. Transverse and sagittal plan sequences of pelvic limbs were obtained using a high-field magnet (1.5T). Afterwards, the ScN and FN blocks (one block per limb) were performed using 0...
January 27, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28168936/dosimetric-comparison-of-real-time-mri-guided-tri-cobalt-60-versus-linear-accelerator-based-stereotactic-body-radiation-therapy-lung-cancer-plans
#14
Andrzej P Wojcieszynski, Patrick M Hill, Stephen A Rosenberg, Craig R Hullett, Zacariah E Labby, Bhudatt Paliwal, Mark W Geurts, R Adam Bayliss, John E Bayouth, Paul M Harari, Michael F Bassetti, Andrew M Baschnagel
PURPOSE: Magnetic resonance imaging-guided radiation therapy has entered clinical practice at several major treatment centers. Treatment of early-stage non-small cell lung cancer with stereotactic body radiation therapy is one potential application of this modality, as some form of respiratory motion management is important to address. We hypothesize that magnetic resonance imaging-guided tri-cobalt-60 radiation therapy can be used to generate clinically acceptable stereotactic body radiation therapy treatment plans...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28167963/physicians-perspectives-on-the-diagnosis-and-treatment-of-chronic-nonbacterial-osteomyelitis
#15
Yongdong Zhao, Fatma Dedeoglu, Polly J Ferguson, Sivia K Lapidus, Ronald M Laxer, Miranda C Bradford, Suzanne C Li
Background/Purpose. Understanding the practices of pediatric rheumatologists in diagnosing and treating chronic nonbacterial osteomyelitis (CNO) can provide important information to guide the development of consensus treatment plans. The objectives of this study were to determine physicians' approaches to (1) diagnosing and monitoring CNO, (2) ordering a bone biopsy, and (3) making treatment decisions. Methods. A survey was distributed among members of the Childhood Arthritis and Rheumatology Research Alliance using a web-based questionnaire...
2017: International Journal of Rheumatology
https://www.readbyqxmd.com/read/28161853/the-variability-of-vertebral-body-volume-and-pain-associated-with-osteoporotic-vertebral-fractures-conservative-treatment-versus-percutaneous-transpedicular-vertebroplasty
#16
Diana Andrei, Iulian Popa, Silviu Brad, Aida Iancu, Manuel Oprea, Cristina Vasilian, Dan V Poenaru
INTRODUCTION: Osteoporotic vertebral fractures (OVF) can lead to late collapse which often causes kyphotic spinal deformity, persistent back pain, decreased lung capacity, increased fracture risk and increased mortality. The purpose of our study is to compare the efficacy and safety of vertebroplasty against conservative management of osteoporotic vertebral fractures without neurologic symptoms. MATERIAL AND METHODS: A total of 66 patients with recent OVF on MRI examination were included in the study...
February 4, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28154019/mib1-index-stratified-assessment-of-dual-tracer-pet-ct-with-68ga-dotatate-and-18f-fdg-and-multimodality-anatomical-imaging-in-metastatic-net-of-unknown-primary-cup-net-scheduled-for-prrt
#17
Nikita Sampathirao, Sandip Basu
AIM: Comparative assessment of dual tracer PET/CT ((68)Ga-DOTATATE and (18)F-FDG) and multimodality anatomical imaging in studying CUP-NETs scheduled for PRRT for: (i) divergence of tracer uptake on dual tracer PET/CT, (ii) detection of primary and (iii) overall lesion detection vis-a-vis tumor proliferation index (Mib1/Ki-67). MATERIALS AND METHODS: Fifty-one patients of CUP-NETs (M:F=25:26, age:22-74 years), histopathologically proven and thoroughly investigated with conventional imaging modalities (USG, CT/ceCT, MRI and EUS, wherever applicable), were retrospective analyzed...
February 2, 2017: Journal of Nuclear Medicine Technology
https://www.readbyqxmd.com/read/28152253/diffusion-tensor-imaging-of-the-human-calf-variation-of-inter-and-intramuscle-specific-diffusion-parameters
#18
Lara Schlaffke, Robert Rehmann, Martijn Froeling, Rudolf Kley, Martin Tegenthoff, Matthias Vorgerd, Tobias Schmidt-Wilcke
PURPOSE: To investigate to what extent inter- and intramuscular variations of diffusion parameters of human calf muscles can be explained by age, gender, muscle location, and body mass index (BMI) in a specific age group (20-35 years). MATERIALS AND METHODS: Whole calf muscles of 18 healthy volunteers were evaluated. Magnetic resonance imaging (MRI) was performed using a 3T scanner and a 16-channel Torso XL coil. Diffusion-weighted images were acquired to perform fiber tractography and diffusion tensor imaging (DTI) analysis for each muscle of both legs...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28150406/preoperative-assessment-of-factors-associated-with-difficulty-in-performing-total-laparoscopic-hysterectomy
#19
Ako Saito, Tetsuya Hirata, Kaori Koga, Masashi Takamura, Shinya Fukuda, Kazuaki Neriishi, Gia Pastorfide, Miyuki Harada, Yasushi Hirota, Osamu Wada-Hiraike, Tomoyuki Fujii, Yutaka Osuga
AIM: Our objective was to determine the preoperative factors associated with difficulty in total laparoscopic hysterectomy (TLH). METHODS: This retrospective clinical study included 157 patients who underwent TLH for leiomyoma or adenomyosis between 2009 and 2013. All patients underwent magnetic resonance imaging (MRI) before surgery. We categorized patients as 'difficult' if the operation time was > 243 min, if total blood loss was > 500 mL, or if conversion to laparotomy was necessary...
February 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28138771/l5-corpectomy-the-lumbosacral-segmental-geometry-and-clinical-outcome-a-consecutive-series-of-14-patients-and-review-of-the-literature
#20
Martin Vazan, Yu-Mi Ryang, Julia Gerhardt, Felix Zibold, Insa Janssen, Florian Ringel, Jens Gempt, Bernhard Meyer
PURPOSE: We analyzed the lumbosacral segmental geometry and clinical outcome in patients undergoing L5 corpectomy. METHODS: Fourteen consecutive patients who underwent L5 (n = 12) or L4 + 5 (n = 2) corpectomy at our department between January 2010 and April 2015 were included. All patients underwent a baseline physical and neurologic examination on admission. The diagnostic routine included MRI and CT scans and, if possible, an upright X-ray of the lumbar spine before and after surgery...
January 31, 2017: Acta Neurochirurgica
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