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https://www.readbyqxmd.com/read/29222852/free-breathing-whole-heart-3d-cine-magnetic-resonance-imaging-with-prospective-respiratory-motion-compensation
#1
Mehdi H Moghari, Ashita Barthur, Maria E Amaral, Tal Geva, Andrew J Powell
PURPOSE: To develop and validate a new prospective respiratory motion compensation algorithm for free-breathing whole-heart 3D cine steady-state free precession (SSFP) imaging. METHODS: In a 3D cine SSFP sequence, 4 excitations per cardiac cycle are re-purposed to prospectively track heart position. Specifically, their 1D image is reconstructed and routed into the scanner's standard diaphragmatic navigator processing system. If all 4 signals are in end-expiration, cine image data from the entire cardiac cycle is accepted for image reconstruction...
December 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29214150/the-physiocam-a-novel-non-contact-sensor-to-measure-heart-rate-variability-in-clinical-and-field-applications
#2
Maria I Davila, Gregory F Lewis, Stephen W Porges
Heart rate variability (HRV) is a reliable indicator of health status and a sensitive index of autonomic stress reactivity. Stress negatively affects physical and psychological wellness by decreasing cardiovascular health and reducing quality of life. Wearable sensors have made it possible to track HRV during daily activity, and recent advances in mobile technology have reduced the cost and difficulty of applying this powerful technique. Although advances have made sensors smaller and lighter, some burden on the subject remains...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/29210110/paediatric-breath-holding-spells-are-associated-with-autonomic-dysfunction-and-iron-deficiency-may-play-a-role
#3
H Tomoum, N Habeeb, I Elagouza, H Mobarez
AIM: This study assessed cardiac performance and iron in subjects aged 12-36 months with breath-holding spells (BHS). METHODS: We consecutively recruited 40 subjects (55% male) experiencing BHS from the general paediatric outpatients department at the Children's Hospital, Ain Shams University, Egypt from 2015-2016. The 20 matched comparisons were mainly healthy siblings. The workup included iron levels and electrocardiograms. RESULTS: The age at the onset of BHS was 5-24 months with a median monthly frequency of 13...
December 6, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/29205623/improvement-of-the-repeatability-of-parallel-transmission-at-7t-using-interleaved-acquisition-in-the-calibration-scan
#4
Hiroyuki Kameda, Kohsuke Kudo, Tsuyoshi Matsuda, Taisuke Harada, Yuji Iwadate, Ikuko Uwano, Fumio Yamashita, Kunihiro Yoshioka, Makoto Sasaki, Hiroki Shirato
BACKGROUND: Respiration-induced phase shift affects B0 /B1+ mapping repeatability in parallel transmission (pTx) calibration for 7T brain MRI, but is improved by breath-holding (BH). However, BH cannot be applied during long scans. PURPOSE: To examine whether interleaved acquisition during calibration scanning could improve pTx repeatability and image homogeneity. STUDY TYPE: Prospective. SUBJECTS: Nine healthy subjects...
December 4, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29204519/cardiac-sparing-radiation-therapy-using-positioning-breast-shell-for-patients-with-left-sided-breast-cancer-who-are-ineligible-for-breath-hold-techniques
#5
Kurian Joseph, Heather Warkentin, Sunita Ghosh, Lee-Anne Polkosnik, Kent Powell, Matthew Brennan, Brad Warkentin, Johanna Jacobs, Khalifa Alkaabi, Susan Chafe, Keith Tankel, Zsolt Gabos, Hong-Wei Liu, Patricia Tai
Purpose: Patients with left-sided breast cancer (LSBC) are at increased risk of cardiac morbidity from adjuvant breast radiation therapy (ABRT). Breath-hold (BH) techniques substantially reduce the radiation received by heart during radiation therapy for LSBC. However, a subset of patients with LSBC are ineligible for BH techniques due to an inability to breath-hold or because of other comorbidities. To reduce radiation to the heart, we routinely use a custom-made breast shell for the treatment of patients with LSBC who are ineligible for BH techniques...
October 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29202394/common-errors-made-in-attempt-to-contract-the-pelvic-floor-muscles-in-women-early-after-delivery-a-prospective-observational-study
#6
Hedwig Neels, Stefan De Wachter, Jean-Jacques Wyndaele, Tinne Van Aggelpoel, Alexandra Vermandel
OBJECTIVES: The ability to perform a correct pelvic floor muscle contraction (PFMC) is necessary to start pelvic floor muscle training after delivery. COMMOV are "c"ontractions of "o"ther "m"uscles (m. rectus abdominus, the gluteal muscles, and the adductors), and other "mov"ements (pelvic tilt, breath holding, and straining) performed in addition to or instead of the PFMC. COMMOV are probably the most common errors in attempt to contract the pelvic floor muscles during the first days after delivery...
November 21, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29195556/immobilization-for-carbon-ion-beam-ablation-of-cardiac-structures-in-a-porcine-model
#7
Matthias Prall, Anna Eichhorn, Daniel Richter, H Immo Lehmann, Anna Constantinescu, Robert Kaderka, Patrick Lugenbiel, Dierk Thomas, Christoph Bert, Douglas L Packer, Marco Durante, Christian Graeff
INTRODUCTION: Whereas hadron therapy of static targets is clinically established, treatment of moving organs remains a challenge. One strategy is to minimize motion of surrounding tissue mechanically and to mitigate residual motion with an appropriate irradiation technique. In this technical note, we present and characterize such an immobilization technique for a novel noncancerous application: the irradiation of small targets in hearts with scanned carbon ion beams in a porcine model for elimination of arrhythmias...
November 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29194732/doppler-ultrasound-triggering-for-cardiac-mri-at-7t
#8
F Kording, C Ruprecht, B Schoennagel, K Fehrs, J Yamamura, G Adam, J Goebel, K Nassenstein, S Maderwald, H H Quick, O Kraff
PURPOSE: A prerequisite for cardiac MR (CMR) imaging is adequate synchronization of image acquisition with the cardiac cycle. Electrocardiogram triggering may be hampered by electromagnetic interferences at high field strength. The purpose of this work is to evaluate the feasibility of Doppler ultrasound triggering for CMR image synchronization at 7T ultra-high-field MRI. METHODS: A custom-built Doppler ultrasound (DUS) trigger device was developed. Magnetic resonance compatibility was evaluated using E- and H-field probes and flip angle maps prior to the study...
December 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29186897/non-coding-rnas-in-pediatric-airway-diseases
#9
REVIEW
Beata Narożna, Wojciech Langwiński, Aleksandra Szczepankiewicz
Non-coding RNAs (ncRNAs) are involved in the regulation of numerous biological processes and pathways and therefore have been extensively studied in human diseases. Previous reports have shown that non-coding RNAs play a crucial role in the pathogenesis and aberrant regulation of respiratory diseases. The altered expression of microRNAs (miRNAs) and long noncoding RNAs in blood and also locally in sputum or exhaled breath condensate influences lung function, immune response, and disease phenotype and may be used for the development of biomarkers specific for airway disease...
November 27, 2017: Genes
https://www.readbyqxmd.com/read/29181255/development-of-a-screening-protocol-to-identify-individuals-with-dysfunctional-breathing
#10
Kyle Kiesel, Tonya Rhodes, Jacob Mueller, Alyssa Waninger, Robert Butler
Introduction: Dysfunctional breathing (DB) has been linked to health conditions including low back pain and neck pain and adversely effects the musculoskeletal system. Individuals with DB often have decreased pain thresholds and impaired motor control, balance, and movement. No single test or screen identifies DB, which is multi-dimensional, and includes biochemical, biomechanical, and psychophysiological components. Several tools assess and test for DB, but no screen exists to determine whether additional testing and assessment are indicated...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29178258/feasibility-analysis-of-early-temporal-kinetics-as-a-surrogate-marker-for-breast-tumor-type-grade-and-aggressiveness
#11
Laura Heacock, Alana A Lewin, Yiming Gao, James S Babb, Samantha L Heller, Amy N Melsaether, Neeti Bagadiya, Sungheon G Kim, Linda Moy
BACKGROUND: Screening breast MRI has been shown to preferentially detect high-grade ductal carcinoma in situ (DCIS) and invasive carcinoma, likely due to increased angiogenesis resulting in early initial uptake of contrast. As interest grows in abbreviated screening breast MRI (AB-MRI), markers of early contrast washin that can predict tumor grade and potential aggressiveness are of clinical interest. PURPOSE: To evaluate the feasibility of using the initial enhancement ratio (IER) as a surrogate marker for tumor grade, hormone receptor status, and prognostic markers, as an initial step to being incorporated into AB-MRI...
November 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29178028/non-invasive-measurement-of-liver-iron-concentration-using-3-tesla-magnetic-resonance-imaging-validation-against-biopsy
#12
Gaspard d'Assignies, Anita Paisant, Edouard Bardou-Jacquet, Anne Boulic, Elise Bannier, Fabrice Lainé, Martine Ropert, Jeff Morcet, Hervé Saint-Jalmes, Yves Gandon
OBJECTIVES: To evaluate the performance and limitations of the R2* and signal intensity ratio (SIR) methods for quantifying liver iron concentration (LIC) at 3 T. METHODS: A total of 105 patients who underwent a liver biopsy with biochemical LIC (LICb) were included prospectively. All patients underwent a 3-T MRI scan with a breath-hold multiple-echo gradient-echo sequence (mGRE). LIC calculated by 3-T SIR algorithm (LICSIR) and by R2* (LICR2*) were correlated with LICb...
November 24, 2017: European Radiology
https://www.readbyqxmd.com/read/29175497/spatiotemporal-characterization-of-breathing-induced-b0-field-fluctuations-in-the-cervical-spinal-cord-at-7t
#13
S Johanna Vannesjo, Karla L Miller, Stuart Clare, Irene Tracey
Magnetic resonance imaging and spectroscopy of the spinal cord stand to benefit greatly from the increased signal-to-noise ratio of ultra-high field. However, ultra-high field also poses considerable technical challenges, especially related to static and dynamic B0 fields. Breathing causes the field to fluctuate with the respiratory cycle, giving rise to artifacts such as ghosting and apparent motion in images. We here investigated the spatial and temporal characteristics of breathing-induced B0 fields in the cervical spinal cord at 7 T...
November 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/29171976/right-versus-left-side-bridge-static-endurance-ability-among-healthy-collegiate-students-at-taibah-university
#14
Tarek M El-Gohary, Samiha M Abd Elkader, Hatem A Emara, Mahmoud I Ibrahim, Osama A Khaled, Mostafa S Ahmed
BACKGROUND: Spinal muscles endurance is fundamental for providing adequate trunk stability. OBJECTIVE: The purpose of this study was to compare the side bridge static endurance ability of the right versus left side. METHODS: Forty right hand dominant students, aged between 18 and 25 years, were recruited from Taibah University. Every participant had to lie down on his side and bear trunk weight on the arm with shoulder abducted to 90∘ and elbow flexed to 90∘...
November 17, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29159855/b1-artifact-reduction-in-abdominal-dce-mri-using-kt-points-first-clinical-assessment-of-dynamic-rf-shimming-at-3t
#15
Raphaël Tomi-Tricot, Vincent Gras, Franck Mauconduit, François Legou, Nicolas Boulant, Matthias Gebhardt, Dieter Ritter, Berthold Kiefer, Pierre Zerbib, Alain Rahmouni, Alexandre Vignaud, Alain Luciani, Alexis Amadon
BACKGROUND: The excitation inhomogeneity artifact occurring at 3T in the abdomen can lead to dramatic loss of signal and contrast, thereby hampering diagnosis. PURPOSE: To assess excitation homogeneity and image quality achieved by nonselective prototypical kT -points pulses, compared to tailored static RF shimming, in clinical routine on a commercial dual-transmit scanner. STUDY TYPE: Retrospective study with Institutional Review Board approval; informed consent was waived...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29158186/diffusion-kurtosis-imaging-with-the-breath-hold-technique-for-staging-hepatic-fibrosis-a-preliminary-study
#16
Daisuke Yoshimaru, Toshiaki Miyati, Yuichi Suzuki, Yuhki Hamada, Nozomi Mogi, Ayumu Funaki, Ayumi Tabata, Atsuko Masunaga, Masahiko Shimada, Maki Tobari, Takayoshi Nishino
PURPOSE: To evaluate the potential of diffusion kurtosis imaging (DKI) analysis with the breath-hold technique to assess the stage or classify hepatic fibrosis. MATERIALS AND METHODS: Patients (n=67) suspected of having a disease of the hepatobiliary system examined by diffusion-weighted imaging (DWI) using a 3.0-T magnetic resonance imaging unit were enrolled in this study. To evaluate hepatic fibrosis, mean kurtosis, Mean apparent diffusion (MD) and apparent diffusion coefficient (ADC) values were compared between groups with varying fibrosis; F0-F1, F2-F3, and F4...
November 17, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29156475/transient-severe-respiratory-motion-artifacts-after-application-of-gadoxetate-disodium-what-we-currently-know
#17
Lennart Well, Julius Matthias Weinrich, Gerhard Adam, Peter Bannas
Background Gadoxetate disodium is an intracellular contrast agent for magnetic resonance imaging (MRI) of the liver. Recent publications revealed that injection of gadoxetate disodium can lead to imaging artifacts due to transient severe motion (TSM) in the arterial phase of contrast-enhanced liver MRI. In this review we present and discuss published frequencies of TSM, contrast injection and image acquisition protocols, potential risk factors, and proposed strategies to avoid or minimize the effects of TSM...
November 20, 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/29153367/real-time-two-dimensional-shear-wave-elastography-for-liver-stiffness-in-children-interobserver-variation-and-effect-of-breathing-technique
#18
Hee Mang Yoon, Young Ah Cho, Jeong Rye Kim, Seung Soo Lee, Ah Young Jung, Jin Seong Lee, Seak Hee Oh, Kyung Mo Kim
OBJECTIVES: To evaluate interobserver variation and to assess the effect of the breathing technique on liver stiffness (LS) measurement using real-time two-dimensional shear-wave elastography (2D-SWE) in children. METHODS: Patients who underwent real-time 2D-SWE by two operators (group 1) and patients who underwent real-time 2D-SWE by one operator using the free-breathing and breath-holding techniques (group 2) were included. In group 1, interobserver agreement was assessed using the intraclass correlation coefficient (ICC) and the 95% limits-of-agreement was analyzed to evaluate the maximum change in the LS values based on Bland-Altman analysis...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29152835/intra-and-inter-fractional-liver-and-lung-tumor-motions-treated-with-sbrt-under-active-breathing-control
#19
Lan Lu, Claudiu Diaconu, Toufik Djemil, Gregory Mm Videtic, May Abdel-Wahab, Naichang Yu, John Greskovich, Kevin L Stephans, Ping Xia
PURPOSE: To assess intra- and inter-fractional motions of liver and lung tumors using active breathing control (ABC). METHODS AND MATERIALS: Nineteen patients with liver cancer and 15 patients with lung cancer treated with stereotactic body radiotherapy (SBRT) were included in this retrospective study. All patients received a series of three CTs at simulation to test breath-hold reproducibility. The centroids of the whole livers and of the lung tumors from the three CTs were compared to assess intra-fraction variability...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152431/intensity-modulated-proton-therapy-with-advanced-planning-techniques-in-a-challenging-hepatocellular-carcinoma-patient
#20
Smith Apisarnthanarax, Jatinder Saini, Avril O'Ryan-Blair, Jackie Castro, Stephen R Bowen
The use of radiation therapy has been increasing over recent years for the treatment of hepatocellular carcinoma (HCC). Proton beam therapy (PBT) has emerged as a promising treatment option for HCC patients due to its dosimetric advantages of sparing more normal liver tissue from radiation at low to moderate doses compared to photon-based treatments while still delivering high doses of radiation to tumors. The PBT therapy may be particularly beneficial in high-risk HCC cirrhotic patients with large, bulky tumors and/or vascular invasion complicated by surrounding perfusion abnormalities...
September 10, 2017: Curēus
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