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Muscle volume MRI

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https://read.qxmd.com/read/30777217/multi-compartment-mesenchymal-tissue-segmentation-in-pelvic-mri-examinations-of-women-anthropomorphic-and-clinical-correlations
#1
Raamis Khwaja, Riham Dessouky, Michael A Heffler, Yin Xi, Ian J Neeland, Avneesh Chhabra
AIM: To investigate the reliability of multicompartmental volumetric mesenchymal segmentations on MRI and their correlations with anthropomorphic and clinical parameters. MATERIALS AND METHODS: A consecutive series of middle-age (35-50 year old) female volunteers with variable body mass index (BMI) and MRI scans performed as a part of the Dallas Heart Study were included. A semi-automatic segmentation tool was used to partition different mesenchymal tissues- fat, muscle, and bone on MRI of pelvis...
March 2019: European Journal of Radiology
https://read.qxmd.com/read/30762839/the-impact-of-cervical-spinal-muscle-degeneration-on-cervical-sagittal-balance-and-spinal-degenerative-disorders
#2
Koji Tamai, Phillip Grisdela, Joshua Romanu, Permsak Paholpak, Hiroaki Nakamura, Jeffrey C Wang, Zorica Buser
STUDY DESIGN: This is a retrospective analysis of kinematic magnetic resonance images (kMRI). OBJECTIVE: To assess the association of cervical paraspinal muscle with cervical sagittal balance and degenerative spinal disorders. SUMMARY OF BACKGROUND DATA: Although the effects of spinal disorders and cervical imbalance on patient's symptoms have been well described, the relationship of the cervical muscle quality and volume to cervical imbalance or spinal disorders is not well established...
February 12, 2019: Clinical Spine Surgery
https://read.qxmd.com/read/30742901/mri-estimates-of-brown-adipose-tissue-in-children-associations-to-adiposity-osteocalcin-and-thigh-muscle-volume
#3
Jonathan Andersson, Josefine Roswall, Emma Kjellberg, Håkan Ahlström, Jovanna Dahlgren, Joel Kullberg
CONTEXT: Brown adipose tissue is of metabolic interest. The tissue is however poorly explored in children. METHODS: Sixty-three 7-year old subjects from the Swedish birth-cohort Halland Health and Growth Study were recruited. Care was taken to include both normal weight and overweight children, but the subjects were otherwise healthy. Only children born full term were included. Water-fat separated whole-body MRI scans, anthropometric measurements, and measurements of fasting glucose and levels of energy homeostasis related hormones, including the insulin-sensitizer osteocalcin, were performed...
February 8, 2019: Magnetic Resonance Imaging
https://read.qxmd.com/read/30739766/reliability-and-robustness-of-muscle-architecture-measurements-obtained-using-diffusion-tensor-imaging-with-anatomically-constrained-tractography
#4
Bart Bolsterlee, Arkiev D'Souza, Robert D Herbert
For detailed analyses of muscle adaptation mechanisms during growth, ageing or disease, reliable measurements of muscle architecture are required. Diffusion tensor imaging (DTI) and DTI tractography have been used to reconstruct the architecture of human muscles in vivo. However, muscle architecture measurements reconstructed with conventional DTI techniques are often anatomically implausible because the reconstructed fascicles do not terminate on aponeuroses, as real muscle fascicles are known to do. In this study, we tested the reliability of an anatomically constrained DTI-based method for measuring three-dimensional muscle architecture...
January 30, 2019: Journal of Biomechanics
https://read.qxmd.com/read/30712221/adult-vitamin-d-deficiency-disrupts-hippocampal-dependent-learning-and-structural-brain-connectivity-in-balb-c-mice
#5
Md Mamun Al-Amin, Robert K P Sullivan, Nyoman D Kurniawan, Thomas H J Burne
Converging evidence from human and animal studies support an association between vitamin D deficiency and cognitive impairment. Previous studies have shown that hippocampal volume is reduced in adults with vitamin D deficiency as well as in a range of disorders, such as schizophrenia. The aim of the current study was to examine the effect of adult vitamin D (AVD) deficiency on hippocampal-dependent spatial learning, and hippocampal volume and connectivity in healthy adult mice. Ten-week-old male BALB/c mice were fed a control (vitamin D 1500 IU/kg) or vitamin D-depleted (vitamin D 0 IU/kg) diet for a minimum of 10 weeks...
February 2, 2019: Brain Structure & Function
https://read.qxmd.com/read/30668869/mri-response-of-obturator-internus-muscle-to-carbon-ion-dose-in-prostate-cancer-treatment
#6
Masahiro Kawahara, Hidemasa Kawamura, Yoshiki Kubota, Hiroyuki Katoh, Nobuteru Kubo, Hirofumi Shimada, Kota Torikai, Masami Torikoshi, Tatsuaki Kanai, Takashi Nakano
It is important to confirm the dose distribution and its biophysiological response in patients subjected to carbon-ion radiotherapy (CIRT) by using medical imaging methods. In this study, the correlation between the signal intensity changes of muscles observed in magnetic resonance imaging (MRI) after CIRT and planned dose distribution was evaluated. Seven patients were arbitrarily selected from among localized prostate cancer patients on whom CIRT was performed in our facilities in 2010. All subjects received the same dose of CIRT, namely, 57...
January 22, 2019: Journal of Radiation Research
https://read.qxmd.com/read/30655082/muscle-volume-reconstruction-from-several-short-magnetic-resonance-imaging-sequences
#7
Robert Marzilger, Arno Schroll, Sebastian Bohm, Adamantios Arampatzis
The gold standard to determine muscle morphological parameters is magnetic resonance imaging (MRI). To measure large muscles like the vastus lateralis (VL) in one sequence, scanners with a large field of view (FOV) and a high flux density are needed. However, large scanners are expensive and not always available. The purpose of the current study was to develop a marker-based approach to reconstruct the VL from several separate MRI sequences, acquired with a low-field MRI scanner. The VL muscle of 21 volunteers was marked at one-third and two-third of thigh length using fish oil capsules...
December 31, 2018: Journal of Biomechanics
https://read.qxmd.com/read/30642331/surgical-injury-and-repair-of-hip-external-rotators-in-tha-via-posterior-approach-a-three-dimensional-mri-evident-quantitative-prospective-study
#8
Ting Wang, Long Shao, Wei Xu, Feilong Li, Wei Huang
BACKGROUND: As one of the classical total hip arthroplasty (THA) approaches, the posterior approach is widely used. However, there is a lack of in-depth quantitative researches on the surgical-related injury to the hip external rotators. The purpose of this study is to quantificationally analyse the surgical injury of hip external rotators after posterior THA and explore the effect of the muscle repair on the muscle recovery using the MRI three-dimensional reconstruction technique combined with the clinical assessment...
January 14, 2019: BMC Musculoskeletal Disorders
https://read.qxmd.com/read/30641671/-a-study-of-superior-oblique-muscle-changes-in-superior-oblique-palsy-using-magnetic-resonance-imaging
#9
R Hao, W Zhang, K X Zhao
Objective: To observe the magnetic resonance imaging(MRI) changes of superior oblique muscle and to study the relationship between changes and clinical signs in superior oblique muscle palsy. Methods: Cross-sectional study. Data was collected from January 2014 to January 2016 in Tianjin Eye Hospital. Twenty-three(30 eyes) patients who were diagnosed with superior oblique palsy included 15 patients with congenital superior oblique palsy [9 males and 6 females aged (32±13) years (range, 12-53 years)] and 8 cases with acquired superior oblique palsy [3 males and 5 females aged (36±15) years(range, 17-62 years)]...
January 11, 2019: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://read.qxmd.com/read/30630152/the-adam-pelvis-phantom-an-anthropomorphic-deformable-and-multimodal-phantom-for-mrgrt
#10
Nina Isabelle Niebuhr, Wibke Johnen, Gernot Echner, Armin Runz, Michael Bach, Markus Stoll, Kristina Giske, Steffen Greilich, Asja Pfaffenberger
Purpose Applicability and accuracy of the rapidly developing tools and workflows for image-guided radiotherapy need to be validated under realistic treatment-like conditions. We present the construction of the ADAM-pelvis phantom, an anthropomorphic, deformable and multimodal (CT and MRI) phantom of the male pelvis. The phantom covers patient-like uncertainties in image-guided radiotherapy workflows including imaging artifacts for the special case of the human anatomy as well as organ motion. 
 Methods Methods and principles were further improved from previous work...
January 10, 2019: Physics in Medicine and Biology
https://read.qxmd.com/read/30620623/regional-and-muscle-specific-adaptations-in-knee-extensor-hypertrophy-using-flywheel-vs-conventional-weight-stack-resistance-exercise
#11
Tommy R Lundberg, Maria Teresa García-Gutiérrez, Mirko Mandic, Mats Lilja, Rodrigo Fernandez-Gonzalo
This study compared the effects of the most frequently employed protocols of flywheel vs. weight-stack resistance exercise (RE) on regional and muscle-specific adaptations of the knee extensors. Sixteen men (n=8) and women (n=8) performed 8 weeks (2-3 days/wk) of knee extension RE employing flywheel technology (FW) on one leg (4x7 repetitions), while the contralateral leg performed regular weight-stack (WS) training (4x8-12 repetitions). Maximal strength (1RM in WS) and peak FW power were determined before and after training for both legs...
January 8, 2019: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://read.qxmd.com/read/30616782/extranodal-extension-is-a-criterion-for-poor-outcome-in-patients-with-metastatic-nodes-from-cancer-of-the-nasopharynx
#12
Qi-Yong Ai, Ann D King, Darren M C Poon, Frankie K F Mo, Edwin P Hui, Macy Tong, Anil T Ahuja, Brigette B Y Ma, Anthony T C Chan
PURPOSE: Extranodal extension (ENE) is a criterion for advanced nodal staging of oropharyngeal and hypopharyngeal carcinoma. Our aim was to determine if ENE should be a staging criterion for nasopharyngeal carcinoma (NPC). MATERIALS & METHODS: MRI of 546 NPC patients were reviewed retrospectively and in 404/546 (74.0%) with metastatic nodes, the nodes were assessed for ENE (grade 0 = absent; grade 1 = infiltration of surrounding fat; grade 2 = infiltration of muscle/skin), size (total volume), site (unilateral/bilateral and upper/lower neck) and necrosis...
January 2019: Oral Oncology
https://read.qxmd.com/read/30614020/quantification-of-body-torso-wide-tissue-composition-on-low-dose-ct-images-via-automatic-anatomy-recognition
#13
Tiange Liu, Jayaram K Udupa, Qiguang Miao, Yubing Tong, Drew A Torigian
PURPOSE: Quantification of body composition plays an important role in many clinical and research applications. Radiologic imaging techniques such as Dual-energy X-ray absorptiometry (DXA), magnetic resonance imaging (MRI), and computed tomography (CT) imaging make accurate quantification of the body composition possible. However, most current imaging based methods need human interaction to quantify multiple tissues. When dealing with whole-body images of many subjects, interactive methods become impractical...
January 5, 2019: Medical Physics
https://read.qxmd.com/read/30572934/magnetic-resonance-images-and-measurements-of-the-volume-proportion-and-longitudinal-distribution-of-contractile-and-non-contractile-tissue-in-the-dorsi-and-plantar-flexor-muscles-of-healthy-young-and-older-adults
#14
Christopher J Hasson, Jane A Kent, Graham E Caldwell
OBJECTIVE: This paper presents magnetic resonance images of the dorsi- and plantar flexor muscles for individual young and older healthy adults. Also included are measurements of the volume, proportion, and longitudinal distribution of contractile and non-contractile tissue. This dataset was previously used to quantify age-related differences in these measures, constrain subject- and muscle-specific estimates of dorsi- and plantar flexor maximal isometric force capability, and quantify the degree to which maximal isometric force capability explains the age-related variance in postural control...
December 20, 2018: BMC Research Notes
https://read.qxmd.com/read/30568419/treatment-with-bimatoprost-for-exophthalmos-in-patients-with-inactive-thyroid-associated-ophthalmopathy
#15
Tomoaki Higashiyama, Masahito Ohji
Purpose: This study was performed to observe changes prospectively in exophthalmos and orbital fat in patients with inactive thyroid-associated ophthalmopathy (TAO) treated with bimatoprost. Methods: In this 12-month single-treatment pilot observational study, 13 patients with inactive-phase TAO were administered bimatoprost to treat exophthalmos due to TAO. Exophthalmos values and orbital tissue volumes were measured on MRI by technicians in a masked fashion. Results: Nine orbits of nine patients (eight women, one man) were treated with bimatoprost for 12 months...
2018: Clinical Ophthalmology
https://read.qxmd.com/read/30561113/use-of-mri-and-fdg-pet-ct-to-predict-fixation-of-advanced-hypopharyngeal-squamous-cell-carcinoma-to-prevertebral-space
#16
Christian M Meerwein, Daniele A Pizzuto, Domenic Vital, Grégoire B Morand, Paul Stolzmann, Gerhard F Huber, Martin W Huellner
BACKGROUND: We evaluated the ability of different (18F)fluoro-deoxy-d-glucose (FDG)-positron emission tomography (PET)-based and magnetic resonance (MR)-based parameters to identify prevertebral space (PVS) infiltration by hypopharyngeal carcinoma. METHODS: Retrospective study on 59 patients with advanced hypopharyngeal squamous cell carcinoma undergoing cross-sectional imaging and triple endoscopy for staging. RESULTS: Obliteration of retropharyngeal fat plane on T1-weighted MR images was found more often (P < ...
December 18, 2018: Head & Neck
https://read.qxmd.com/read/30548814/pelvic-magnetic-resonance-imaging-parameters-predict-urinary-incontinence-after-robot-assisted-radical-prostatectomy
#17
Takuya Sadahira, Yosuke Mitsui, Motoo Araki, Yuki Maruyama, Koichiro Wada, Kohei Edamura, Yasuyuki Kobayashi, Masami Watanabe, Toyohiko Watanabe, Yasutomo Nasu
OBJECTIVE: Urinary incontinence (UI) is a major prostate cancer (PCa) treatment-related morbidity. It has been reported that post-prostatectomy UI is related to the width of the pelvic floor muscles (PFM) and the length of the urethra. However, the details of these anatomical parameters are unknown. The aim of this study was to investigate whether preoperative pelvic parameters or anatomical parameters of the urethra, as measured by magnetic resonance imaging (MRI), are correlated with UI...
December 12, 2018: Lower Urinary Tract Symptoms
https://read.qxmd.com/read/30525186/validity-and-reliability-of-a-freehand-3d-ultrasound-system-for-the-determination-of-triceps-surae-muscle-volume-in-children-with-cerebral-palsy
#18
L Barber, C Alexander, P Shipman, R Boyd, S Reid, C Elliott
This study assessed the validity, intra-rater and inter-rater reliability of segmentation of in vivo medial gastrocnemius (MG), lateral gastrocnemius (LG) and soleus (SOL) muscle volume measurement using a single sweep freehand 3D ultrasound (3DUS) in children with cerebral palsy (CP). The MG, LG and SOL of both limbs of 18 children with CP (age 8 years 4 months ± 1 year 10 months, 11 males, unilateral CP = 9, bilateral CP = 9, Gross Motor Functional Classification System I = 11, II = 7) were scanned using freehand 3DUS and magnetic resonance imaging (MRI)...
December 7, 2018: Journal of Anatomy
https://read.qxmd.com/read/30510375/development-of-a-novel-rat-model-of-heterogeneous-hepatic-injury-by-injection-with-colchicine-via-the-splenic-vein
#19
Yan-Yan Zhang, Chao-Xu Zhang, Yu Li, Xuan Jiang, Yong-Fang Wang, Yang Sun, Jun Wang, Wan-Ying Ji, Yi Liu
AIM: To develop a novel rat model of heterogeneous hepatic injury. METHODS: Seventy male Sprague-Dawley rats were randomly divided into a control group ( n = 10) and a colchicine group ( n = 60). A 0.25% colchicine solution (0.4 mL/kg) was injected via the splenic vein in the colchicine group to develop a rat model of heterogeneous hepatic injury. An equal volume of normal saline was injected via the splenic vein in the control group. At days 3, 7, and 14 and weeks 4, 8, and 12 after the operation, at least seven rats of the colchicine group were selected randomly for magnetic resonance imaging (MRI) examinations, and then they were euthanized...
November 28, 2018: World Journal of Gastroenterology: WJG
https://read.qxmd.com/read/30496308/quantifying-skeletal-muscle-volume-and-shape-in-humans-using-mri-a-systematic-review-of-validity-and-reliability
#20
Christelle Pons, Bhushan Borotikar, Marc Garetier, Valérie Burdin, Douraied Ben Salem, Mathieu Lempereur, Sylvain Brochard
AIMS: The aim of this study was to report the metrological qualities of techniques currently used to quantify skeletal muscle volume and 3D shape in healthy and pathological muscles. METHODS: A systematic review was conducted (Prospero CRD42018082708). PubMed, Web of Science, Cochrane and Scopus databases were searched using relevant keywords and inclusion/exclusion criteria. The quality of the articles was evaluated using a customized scale. RESULTS: Thirty articles were included, 6 of which included pathological muscles...
2018: PloS One
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