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Knee MR image

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https://www.readbyqxmd.com/read/29782242/case-254-posttraumatic-migrating-fat-embolus-causing-fat-emboli-syndrome
#1
Sébastien Molière, Stéphane Kremer, Guillaume Bierry
History An otherwise healthy 18-year-old man was admitted to the emergency department with a closed displaced fracture of the left femoral shaft ( Fig 1 ) after a high-velocity motorbike accident. At admission, other physical examination findings were unremarkable. Initial unenhanced and contrast material-enhanced (120 mL of Iomeron 400; Bracco Imaging, Milan, Italy) computed tomography (CT) was performed in the arterial and venous phases from the head to the knees. No abnormalities were noted in the brain or chest at initial CT...
June 2018: Radiology
https://www.readbyqxmd.com/read/29780615/feasibility-of-synthetic-mri-in-knee-imaging-in-routine-practice
#2
Sana Boudabbous, Angeliki Neroladaki, Ilias Bagetakos, Marion Hamard, Bénédicte Ma Delattre, Maria Isabel Vargas
Background: Synthetic magnetic resonance (MR) is a method allowing reduction of examination time and access to quantitative imaging. Purpose: This study sought to assess the image quality and diagnostic accuracy of synthetic magnetic resonance imaging (MRI) compared to standard MRI in patients with knee pain. Material and Methods: In total, 22 patients underwent standard 1.5 knee MRI with an added synthetic sequence. Quantitative T1, T2, and proton density (PD) images were generated synthetically; T1, PD, and short tau inversion recovery (STIR) weighted images were created with chosen echo time (TE), repetition time (TR), and inversion time (TI)...
May 2018: Acta Radiologica Open
https://www.readbyqxmd.com/read/29774599/deep-convolutional-neural-network-for-segmentation-of-knee-joint-anatomy
#3
Zhaoye Zhou, Gengyan Zhao, Richard Kijowski, Fang Liu
PURPOSE: To describe and evaluate a new segmentation method using deep convolutional neural network (CNN), 3D fully connected conditional random field (CRF), and 3D simplex deformable modeling to improve the efficiency and accuracy of knee joint tissue segmentation. METHODS: A segmentation pipeline was built by combining a semantic segmentation CNN, 3D fully connected CRF, and 3D simplex deformable modeling. A convolutional encoder-decoder network was designed as the core of the segmentation method to perform high resolution pixel-wise multi-class tissue classification for 12 different joint structures...
May 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29774597/assessment-of-the-generalization-of-learned-image-reconstruction-and-the-potential-for-transfer-learning
#4
Florian Knoll, Kerstin Hammernik, Erich Kobler, Thomas Pock, Michael P Recht, Daniel K Sodickson
PURPOSE: Although deep learning has shown great promise for MR image reconstruction, an open question regarding the success of this approach is the robustness in the case of deviations between training and test data. The goal of this study is to assess the influence of image contrast, SNR, and image content on the generalization of learned image reconstruction, and to demonstrate the potential for transfer learning. METHODS: Reconstructions were trained from undersampled data using data sets with varying SNR, sampling pattern, image contrast, and synthetic data generated from a public image database...
May 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29748692/clinics-in-diagnostic-imaging-185
#5
Ying Xin Candice Leong, Poh Lye Paul See
A 20-year-old National Serviceman presented with left knee pain and swelling after training for his physical fitness test. Lateral knee radiography and magnetic resonance (MR) imaging showed patellar tendon-lateral femoral condyle friction syndrome (PT-LFCFS), on a background of patella alta and patellar malalignment. The patient was treated non-operatively with a course of physiotherapy and given advice on rest and activity modification. PT-LFCFS is a less well-recognised but important cause of anterior knee pain and represents an entity in a spectrum of disorders related to patellofemoral instability...
April 2018: Singapore Medical Journal
https://www.readbyqxmd.com/read/29743050/unmasking-of-intracranial-metastatic-melanoma-during-ipilimumab-nivolumab-therapy-case-report-and-literature-review
#6
Marin A McDonald, Parag Sanghvi, Julie Bykowski, Gregory A Daniels
BACKGROUND: While data from several studies over the last decade has demonstrated that introduction of immunologic checkpoint blockage therapy with anti-CTLA-4/PD-1 drugs leads to improved survival in metastatic melanoma patients, relatively little is known about brain-specific therapeutic response and adverse events in the context of immunotherapeutic treatment of intracranial disease. Here we report two independent cases of new intracranial metastases presenting after initiation of combined checkpoint blockade Ipilimumab and Nivolumab for recurrent metastatic melanoma in the context of positive systemic disease response...
May 9, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29728742/in-vivo-three-dimensional-mr-imaging-of-the-intact-anterior-cruciate-ligament-shows-a-variable-insertion-pattern-of-the-femoral-and-tibial-footprints
#7
S U Scheffler, K Maschewski, R Becker, P Asbach
PURPOSE: Failure to reconstruct the natural footprints of the ruptured anterior cruciate ligament (ACL) may lead to premature graft-failure. Therefore, precise analyses of insertion site anatomy and inter-individual variations of the morphology of the ACL are highly important to facilitate optimal individualized graft placement. Therefore, the purpose of this study was to analyze the inter-individual variation of the morphology of the femoral and tibial ACL footprints. METHODS: Thirty subjects with an intact ACL were included in this study for MR imaging of their knee joint...
May 4, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29718873/the-imaging-features-of-the-meniscal-roots-on-isotropic-3d-mri-in-young-asymptomatic-volunteers
#8
Ping Wang, Cheng-Zhou Zhang, Di Zhang, Quan-Yuan Liu, Xiao-Fei Zhong, Zhi-Jie Yin, Bin Wang
BACKGROUND: This study aimed to describe clearly the normal imaging features of the meniscal roots on the magnetic resonance imaging (MRI) with a 3-dimensional (3D) proton density-weighted (PDW) sequence at 3T. METHODS: A total of 60 knees of 31 young asymptomatic volunteers were examined using a 3D MRI. The insertion patterns, constitution patterns, and MR signals of the meniscal roots were recorded. RESULTS: The anterior root of the medial meniscus (ARMM), the anterior root of the lateral meniscus (ARLM), and the posterior root of the medial meniscus (PRMM) had 1 insertion site, whereas the posterior root of the lateral meniscus (PRLM) can be divided into major and minor insertion sites...
May 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29705172/the-effect-of-arch-drop-on-tibial-rotation-and-tibiofemoral-contact-stress-in-postpartum-women
#9
Kaitlin Rabe, Neil A Segal, Saphia Waheed, Donald D Anderson
BACKGROUND: Women are at higher risk for knee osteoarthritis and numerous other lower limb musculoskeletal disorders. Arch drop during pregnancy and the resultant excessive pronation of the feet may alter loading patterns and contribute to the higher prevalence of knee osteoarthritis in women. OBJECTIVE: To determine the effect of arch drop on tibial rotation and tibiofemoral contact stress. DESIGN: Interventional study with internal control SETTING: Biomechanics laboratory PARTICIPANTS: Eleven postpartum women (age 33...
April 26, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29694643/quantitative-analysis-of-the-perimeniscal-position-of-the-inferior-lateral-genicular-artery-ilga-magnetic-resonance-imaging-study
#10
Jiwon Park, Sang Soo Lee, Tae Woo Kim
PURPOSE: The inferior lateral genicular artery (ILGA) passes around the lateral knee joint, adjacent to the lateral meniscus (LM). ILGA injuries in total knee arthroplasty or arthroscopic surgery can result in recurrent hemarthrosis or painful pseudoaneurysms. Detailed information about the perimeniscal position of the ILGA relative to the LM is necessary to avoid these complications. METHODS: 3-T MR images of 100 knees (mean age 36.3 ± 11.2 years) were retrospectively reviewed...
April 24, 2018: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29681528/local-associations-between-knee-cartilage-t-1%C3%AF-and-t-2-relaxation-times-and-patellofemoral-joint-stress-during-walking-a-voxel-based-relaxometry-analysis
#11
Hsiang-Ling Teng, Valentina Pedoia, Thomas M Link, Sharmila Majumdar, Richard B Souza
BACKGROUND: This study aimed to utilize voxel-based relaxometry (VBR) to examine local correlations between patellofemoral joint (PFJ) stress during gait and PFJ cartilage relaxation times. METHODS: Eighty-three subjects with and without PFJ osteoarthritis (OA) underwent knee magnetic resonance (MR) images using fast spin-echo, T1ρ and T2 relaxation time sequences. Patellar and trochlear cartilage relaxation times were computed for each voxel. Peak PFJ stress was computed during the stance phase from three-dimensional gait analysis...
April 19, 2018: Knee
https://www.readbyqxmd.com/read/29664339/general-practitioners-referring-adults-to-mr-imaging-for-knee-pain-a-randomized-controlled-trial-to-assess-cost-effectiveness
#12
Kim van Oudenaarde, Nynke M Swart, Johan L Bloem, Sita M A Bierma-Zeinstra, Paul R Algra, Patrick J E Bindels, Bart W Koes, Rob G H H Nelissen, Jan A N Verhaar, Pim A J Luijsterburg, Monique Reijnierse, Wilbert B van den Hout
Purpose To determine the cost-effectiveness of early referral by the general practitioner for magnetic resonance (MR) imaging compared with usual care alone in patients aged 18-45 years with traumatic knee symptoms. Materials and Methods Cost-utility analysis was performed parallel to a prospective multicenter randomized controlled trial in Dutch general practice. A total of 356 patients with traumatic knee symptoms were included from November 2012 to December 2015 (mean age, 33 years ± 8 [standard deviation]; 222 men [62%])...
April 17, 2018: Radiology
https://www.readbyqxmd.com/read/29656389/the-robustness-of-t-2-value-as-a-trabecular-structural-index-at-multiple-spatial-resolutions-of-7-tesla-mri
#13
D K Lee, Y K Song, B W Park, H P Cho, J S Yeom, G Cho, H Cho
PURPOSE: To evaluate the robustness of MR transverse relaxation times of trabecular bone from spin-echo and gradient-echo acquisitions at multiple spatial resolutions of 7 T. METHODS: The effects of MRI resolutions to T2 and T2* of trabecular bone were numerically evaluated by Monte Carlo simulations. T2 , T2*, and trabecular structural indices from multislice multi-echo and UTE acquisitions were measured in defatted human distal femoral condyles on a 7 T scanner...
April 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29656143/quantitative-imaging-of-bone-cartilage-interactions-in-acl-injured-patients-with-pet-mri
#14
F Kogan, A P Fan, U Monu, A Iagaru, B A Hargreaves, G E Gold
OBJECTIVE: To investigate changes in bone metabolism by positron emission tomography (PET), as well as spatial relationships between bone metabolism and magnetic resonance imaging (MRI) quantitative markers of early cartilage degradation, in anterior cruciate ligament (ACL)-reconstructed knees. DESIGN: Both knees of 15 participants with unilateral reconstructed ACL tears and unaffected contralateral knees were scanned using a simultaneous 3.0T PET-MRI system following injection of 18 F-sodium fluoride (18 F-NaF)...
April 12, 2018: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29648688/quantitative-signal-intensity-alteration-in-infrapatellar-fat-pad-predict-incident-radiographic-osteoarthritis-the-osteoarthritis-initiative
#15
Kang Wang, Changhai Ding, Michael J Hannon, Zhongshan Chen, C Kent Kwoh, David J Hunter
OBJECTIVES: To determine if infrapatellar fat pad (IPFP) signal intensity (SI) measures are predictive of incident radiographic osteoarthritis (iROA) over 4 years in the OA Initiative (OAI) study. METHODS: Case knees (n=355) defined by iROA were matched one-to-one by gender, age and radiographic status with control knees. T2-weighted MR images were assessed at P0 (the visit when iROA was found on radiograph), P-1 (1 year prior to P0) and baseline, and utilized to assess IPFP SI semi-automatically using MATLAB...
April 12, 2018: Arthritis Care & Research
https://www.readbyqxmd.com/read/29584598/use-of-2d-u-net-convolutional-neural-networks-for-automated-cartilage-and-meniscus-segmentation-of-knee-mr-imaging-data-to-determine-relaxometry-and-morphometry
#16
Berk Norman, Valentina Pedoia, Sharmila Majumdar
Purpose To analyze how automatic segmentation translates in accuracy and precision to morphology and relaxometry compared with manual segmentation and increases the speed and accuracy of the work flow that uses quantitative magnetic resonance (MR) imaging to study knee degenerative diseases such as osteoarthritis (OA). Materials and Methods This retrospective study involved the analysis of 638 MR imaging volumes from two data cohorts acquired at 3.0 T: (a) spoiled gradient-recalled acquisition in the steady state T1ρ -weighted images and (b) three-dimensional (3D) double-echo steady-state (DESS) images...
March 27, 2018: Radiology
https://www.readbyqxmd.com/read/29582464/super-resolution-musculoskeletal-mri-using-deep-learning
#17
Akshay S Chaudhari, Zhongnan Fang, Feliks Kogan, Jeff Wood, Kathryn J Stevens, Eric K Gibbons, Jin Hyung Lee, Garry E Gold, Brian A Hargreaves
PURPOSE: To develop a super-resolution technique using convolutional neural networks for generating thin-slice knee MR images from thicker input slices, and compare this method with alternative through-plane interpolation methods. METHODS: We implemented a 3D convolutional neural network entitled DeepResolve to learn residual-based transformations between high-resolution thin-slice images and lower-resolution thick-slice images at the same center locations. DeepResolve was trained using 124 double echo in steady-state (DESS) data sets with 0...
March 26, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29578473/medial-collateral-ligament-bursitis-in-a-patient-with-knee-osteoarthritis
#18
Hakan Nur, Ayca Aytekin, Erdal Gilgil
BACKGROUND: Medial collateral ligament (MCL) bursitis has been described as a distended and inflamed bursa between the superficial and deep portions of the MCL. It is a rare but important cause of medial knee pain. CASE DESCRIPTION: A 65-year-old woman with knee osteoarthritis (OA) presented with severe pain and swelling in her left knee. She didn't have a traumatic injury. After a clinical examination, a slight decrease in the range of motion of the left knee, and a painful swelling and tenderness over the medial side of the knee and proximal tibia were detected...
March 16, 2018: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29531490/tibial-tuberosity-trochlear-groove-distance-shows-no-change-in-patients-with-or-without-knee-osteoarthritis
#19
Namik Sahin, Teoman Atici, Guven Ozkaya
Objective: The primary aim of this study is to compare tibial tuberosity-trochlear groove (TTTG) distance in patients with or without knee osteoarthritis. Additionally, the variability of tibial tubercle according to trochlear groove was evaluated. Materials and Methods: In this retrospective cohort study, TTTG distance was measured with two different methods on magnetic resonance (MR) images. TTTG distance was measured by the familiar method on 173 MR images, and by the novel method on 157 MR images of 175 patients totally...
February 2018: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/29476215/natural-evolution-of-popliteomeniscal-fascicle-tears-over-2-years-and-its-association-with-lateral-articular-knee-cartilage-degeneration-in-patients-with-traumatic-anterior-cruciate-ligament-tear
#20
Julio Brandao Guimaraes, Luca Facchetti, Benedikt J Schwaiger, Alexandra S Gersing, Xiaojuan Li, Thomas M Link
OBJECTIVES: To assess (i) normal imaging anatomy of the popliteomeniscal fascicles, (ii) prevalence and natural evolution of popliteomeniscal fascicle tears (PMFT) in subjects with traumatic anterior cruciate ligament (ACL) tears over 2 years and (iii) compare knee cartilage degeneration in subjects with and without PMFT longitudinally. METHODS: 57 subjects with ACL tears were screened for PMFT. Morphological (high-resolution 3D fast spin-echo) and compositional (T1ρ and T2 mapping) MR imaging was performed prior to and 2 years after ACL reconstruction...
February 23, 2018: European Radiology
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