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https://www.readbyqxmd.com/read/28432730/assessment-of-voluntary-deep-inspiration-breath-hold-with-cine-imaging-for-breast-radiotherapy
#1
Reuben Patrick Estoesta, Lani Attwood, Diana Naehrig, Elizabeth Claridge-Mackonis, David Odgers, Darren Martin, Melissa Pham, Joanne Toohey, Susan Carroll
Deep Inspiration Breath-Hold (DIBH) techniques for breast cancer radiation therapy (RT) have reduced cardiac dose compared to Free Breathing (FB). Recently, a voluntary deep inspiration breath-hold (vDIBH) technique was established using in-room lasers and skin tattoos to monitor breath-hold. An in-house quality assessment of positional reproducibility during RT delivery with vDIBH in patients with left-sided breast cancer was evaluated. The electronic portal imaging device (EPID) was used in cinematographic (CINE) mode to capture a sequence of images during beam delivery...
April 22, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28428470/effects-of-valsalva-maneuver-by-different-breath-holding-techniques-to-detect-pulmonary-thromboembolism-in-a-contrast-enhanced-computed-tomography-examination
#2
Chiaki Suzuki, Kenji Fujisaki, Yuusuke Atsumi, Miki Takemura, Kouichi Mizuno, Takeki Nagamine, Tomoyasu Amano, Hideo Yamamoto, Mamoru Takahashi
The purpose of this study is to measure the hemodynamics on the effect of Valsalva maneuver aiming at pulmonary thromboembolism (PTE) using 2-dimensional (2D) phase contrast imaging of magnetic resonance image (MRI), Philips Ingenia 3.0-tesla (T). The maximal inspiration reduced the blood flow rate in various degrees at all measurement positions, superior vena cava (SVC), inferior vena cava (IVC), pulmonary artery (PA), ascending aorta (AA), and descending aorta (DA). This result suggests that the contrast effect in the PA might become weak during general PA phase to give a substantial influence of Valsalva maneuver in the condition after maximum inspiration...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28427550/home-made-spacer-as-an-auxiliary-device-in-administration-of-beclomethasone-via-pressurized-metered-dose-inhaler-for-asthma-control-a-randomized-controlled-pragmatic-trial
#3
Deborah Schor, José Ângelo Rizzo, Decio Medeiros, Ana Carolina Dela Bianca, Almerinda Rego Silva, Carlos Nunes, Mário Morais-Almeida, Emanuel Sarinho
BACKGROUND: Holding chambers or spacers can enhance the efficacy of pressurized metered dose inhalers (pMDI) in delivering inhaled medications, as they reduce the need for hand-breath coordination and improve lower airways deposition. Nevertheless, their cost can be high for patients in low-income countries. OBJECTIVE: To compare asthma control achieved with beclomethasone-dipropionate administered through a hydrofluoroalkane-driven pMDI (BDp-pMDI) coupled to a home-made spacer (HmS) or to a valved commercial spacer (VCS) as auxiliary devices...
May 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28419608/multiple-breath-hold-proton-spectroscopy-of-human-liver-at-3t-relaxation-times-and-concentrations-of-glycogen-choline-and-lipids
#4
Jan Weis, Joel Kullberg, Håkan Ahlström
PURPOSE: To evaluate the feasibility of an expiration multiple breath-hold (1) H-MRS technique to measure glycogen (Glycg), choline-containing compounds (CCC), and lipid relaxation times T1 , T2 , and their concentrations in normal human liver. MATERIALS AND METHODS: Thirty healthy volunteers were recruited. Experiments were performed at 3T. Multiple expiration breath-hold single-voxel point-resolved spectroscopy (PRESS) technique was used for localization. Water-suppressed spectra were used for the estimation of Glycg, CCC, lipid methylene (CH2 )n relaxation times and concentrations...
April 17, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28419591/application-of-spin-echoes-in-the-regime-of-weak-dephasing-to-t1-mapping-of-the-lung
#5
Jakob Assländer, Steffen J Glaser, Jürgen Hennig
PURPOSE: This work presents an approach to mapping the entire lung's proton density and T1 within a single breath-hold and analyzes the apparent T1 when exciting with a spin echo generating pulse in comparison to a standard gradient echo acquisition. METHODS: An inversion-recovery SNAPSHOT-FLASH sequence with a stack-of-stars k-space readout with a golden angle increment was modified to use a spin echo generating radiofrequency-pulse for excitation. Data of five volunteers were acquired on a 3T scanner and image reconstruction was performed by an iterative algorithm adopted from MR-Fingerprinting...
April 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28419582/free-breathing-liver-fat-quantification-using-a-multiecho-3d-stack-of-radial-technique
#6
Tess Armstrong, Isabel Dregely, Alto Stemmer, Fei Han, Yutaka Natsuaki, Kyunghyun Sung, Holden H Wu
PURPOSE: The diagnostic gold standard for nonalcoholic fatty liver disease is an invasive biopsy. Noninvasive Cartesian MRI fat quantification remains limited to a breath-hold (BH). In this work, a novel free-breathing 3D stack-of-radial (FB radial) liver fat quantification technique is developed and evaluated in a preliminary study. METHODS: Phantoms and healthy subjects (n = 11) were imaged at 3 Tesla. The proton-density fat fraction (PDFF) determined using FB radial (with and without scan acceleration) was compared to BH single-voxel MR spectroscopy (SVS) and BH 3D Cartesian MRI using linear regression (correlation coefficient ρ and concordance coefficient ρc ) and Bland-Altman analysis...
April 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28419361/effect-of-electrical-stunning-frequency-and-current-waveform-in-poultry-welfare-and-meat-quality
#7
T S Siqueira, T D Borges, R M M Rocha, P T Figueira, F B Luciano, R E F Macedo
This study aimed to evaluate the effects of different stunning frequencies and electrical current waveforms on chicken welfare and meat quality. Two-hundred-thirty-two Cobb broilers, 48 d of age and 2.76 ± 0.47 live-weight, were randomly assigned into 4 stunning treatments - 2 frequencies (300 Hz and 650 Hz) and 2 current waveforms (direct current [DC] and alternating current [AC]). Broilers were electrically stunned in a water bath in a commercial slaughterhouse (70 V, 100 mA). The electronarcosis and stunning efficiency were confirmed by assessment of visual parameters (absence of rhythmic breathing, ocular reflex, and coordinated wing flapping) and blood parameters (lactate, glucose, creatine kinase, sodium, and potassium), which were measured after bleeding...
April 17, 2017: Poultry Science
https://www.readbyqxmd.com/read/28417333/immediate-tissue-expander-or-implant-based-breast-reconstruction-does-not-compromise-the-oncologic-delivery-of-post-mastectomy-radiotherapy-pmrt
#8
Krishan R Jethwa, Mohamed M Kahila, Thomas J Whitaker, William S Harmsen, Kimberly S Corbin, Sean S Park, Elizabeth S Yan, Valerie Lemaine, Judy C Boughey, Robert W Mutter
PURPOSE: Increasingly, women are choosing immediate breast reconstruction (IBR) following mastectomy. Reports have indicated IBR may compromise post-mastectomy radiotherapy (PMRT). We investigated the impact of IBR on timing of PMRT, target coverage, and doses to organs at risk in a modern radiotherapy practice using advanced planning techniques. METHODS: Between 2013 and 2015, PMRT was delivered to 116 patients (66 mastectomy alone, 50 IBR). PMRT was delivered with a median dose of 50 Gy in 25 fractions...
April 17, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/28409251/advanced-imaging-techniques-in-pediatric-body-mri
#9
REVIEW
Jesse Courtier, Anil G Rao, Sudha A Anupindi
While there are many challenges specific to pediatric abdomino-pelvic MRI, many recent advances are addressing these challenges. It is therefore essential for radiologists to be familiar with the latest advances in MR imaging. Laudable efforts have also recently been implemented in many centers to improve the overall experience of pediatric patients, including the use of dedicated radiology child life specialists, MRI video goggles, and improved MR suite environments. These efforts have allowed a larger number of children to be scanned while awake, with fewer studies being done under sedation or anesthesia; this has resulted in additional challenges from patient motion and difficulties with breath-holding and tolerating longer scan times...
May 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28406294/non-invasive-respiratory-metabolite-analysis-associated-with-clinical-disease-in-cetaceans-a-deepwater-horizon-oil-spill-study
#10
Alberto Pasamontes, Alexander A Aksenov, Michael Schivo, Teri Rowles, Cynthia R Smith, Lori H Schwacke, Randall S Wells, Laura Yeates, Stephanie Venn-Watson, Cristina E Davis
Health assessments of wild cetaceans can be challenging due to the difficulty of gaining access to conventional diagnostic matrices of blood, serum and others. While the non-invasive detection of metabolites in exhaled breath could potentially help to address this problem, there exists a knowledge gap regarding associations between known disease states and breath metabolite profiles in cetaceans. This technology was applied to the largest marine oil spill in U.S. history (The 2010 Deepwater Horizon oil spill in the Gulf of Mexico)...
April 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28398929/comprehensive-dynamic-contrast-enhanced-3d-magnetic-resonance-imaging-of-the-breast-with-fat-water-separation-and-high-spatiotemporal-resolution-using-radial-sampling-compressed-sensing-and-parallel-imaging
#11
Thomas Benkert, Kai Tobias Block, Samantha Heller, Melanie Moccaldi, Daniel K Sodickson, Sungheon Gene Kim, Linda Moy
OBJECTIVES: The aim of this study was to assess the applicability of Dixon radial volumetric encoding (Dixon-RAVE) for comprehensive dynamic contrast-enhanced 3D magnetic resonance imaging (MRI) of the breast using a combination of radial sampling, model-based fat/water separation, compressed sensing, and parallel imaging. MATERIALS AND METHODS: In this Health Insurance Portability and Accountability Act-compliant prospective study, 24 consecutive patients underwent bilateral breast MRI, including both conventional fat-suppressed and non-fat-suppressed precontrast T1-weighted volumetric interpolated breath-hold examination (VIBE)...
April 11, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28390002/a-tool-for-validating-mri-guided-strategies-a-digital-breathing-ct-mri-phantom-of-the-abdominal-site
#12
Chiara Paganelli, Paul Summers, Chiara Gianoli, Massimo Bellomi, Guido Baroni, Marco Riboldi
Dynamic magnetic resonance imaging (MRI) is emerging as the elected image modality for organ motion quantification and management in image-guided radiotherapy. However, the lack of validation tools is an open issue for image guidance in the abdominal and thoracic organs affected by organ motion due to respiration. We therefore present an abdominal four-dimensional (4D) CT/MRI digital phantom, including the estimation of MR tissue parameters, simulation of dedicated abdominal MR sequences, modeling of radiofrequency coil response and noise, followed by k-space sampling and image reconstruction...
April 8, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28389274/significance-of-breath-hold-time-in-dry-powder-aerosol-drug-therapy-of-copd-patients
#13
Alpár Horváth, Imre Balásházy, Gábor Tomisa, Árpád Farkas
Aerosol drugs are effectively used to treat chronic respiratory diseases. The efficiency of the therapy depends also on the amount and distribution of drug deposited within the airways. The objective of this study is to apply numerical techniques to analyse the effect of the duration of breath-hold after the inhalation of six different commercialized dry powder drugs on their lung deposition. For this purpose a computational airway deposition model has been adapted and validated to the special case of therapeutic aerosols...
April 4, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28386274/do-face-to-face-training-and-telephonic-reminder-improve-dry-powder-inhaler-technique-in-patients-with-copd
#14
Ramesh Sharma Poudel, Shakti Shrestha, Pawan Bhatta, Rano Mal Piryani
Introduction. Current modes of instruction on inhaler technique are inadequate. We aimed to evaluate the value of face-to-face training and telephonic reminder (FFTTR) for improving Rotahaler technique in experienced patients with COPD. Materials and Methods. A single group pre-/postinterventional study was conducted at Chitwan Medical College Teaching Hospital, Nepal. We assessed the Rotahaler technique of thirty consecutive patients using Rotahaler device for more than one year. Patients with incorrect technique (n = 20) were instructed and trained by a pharmacist...
2017: International Journal of Telemedicine and Applications
https://www.readbyqxmd.com/read/28383791/breath-hold-and-free-breathing-2d-phase-contrast-mri-for-quantification-of-oxygen-induced-changes-of-pulmonary-circulation-dynamics-in-healthy-volunteers
#15
Christoph P Czerner, Hinrich B Winther, Antonia Zapf, Frank Wacker, Jens Vogel-Claussen
PURPOSE: To evaluate the effect of inhaled 100% oxygen on pulmonary circulation dynamics in healthy volunteers using 2D phase-contrast magnetic resonance imaging (2D PC MRI). MATERIALS AND METHODS: Twenty-one healthy volunteers were examined at 1.5T. Through-plane 2D PC MRI measurements were performed in the main pulmonary artery during free-breathing and breath-hold. Acceleration time and volume, maximum and minimum area, area change, average and maximum mean velocity, forward volume, heart rate, as well as blood pressure were determined...
April 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28382061/effect-of-breathing-technique-of-blowing-on-the-extent-of-damage-to-the-perineum-at-the-moment-of-delivery-a-randomized-clinical-trial
#16
Zohre Ahmadi, Shahnaz Torkzahrani, Firouze Roosta, Nezhat Shakeri, Zohre Mhmoodi
INTRODUCTION: One of the important tasks in managing labor is the protection of perineum. An important variable affecting this outcome is maternal pushing during the second stage of labor. This study was done to investigate the effect of breathing technique on perineal damage extention in laboring Iranian women. MATERIALS AND METHODS: This randomized clinical trial was performed on 166 nulliparous pregnant women who had reached full-term pregnancy, had low risk pregnancy, and were candidates for vaginal delivery in two following groups: using breathing techniques (case group) and valsalva maneuver (control group)...
January 2017: Iranian Journal of Nursing and Midwifery Research
https://www.readbyqxmd.com/read/28378187/ultra-low-dose-sequential-computed-tomography-for-quantitative-lung-aeration-assessment-a-translational-study
#17
Lorenzo Ball, Anja Braune, Francesco Corradi, Claudia Brusasco, Alessandro Garlaschi, Thomas Kiss, Thomas Bluth, Francesca Simonassi, Alice Bergamaschi, Jörg Kotzerke, Marcus J Schultz, Marcelo Gama de Abreu, Paolo Pelosi
BACKGROUND: Quantitative lung computed tomography (CT) provides fundamental information about lung aeration in critically ill patients. We tested a scanning protocol combining reduced number of CT slices and tube current, comparing quantitative analysis and radiation exposure to conventional CT. METHODS: In pigs, CT scans were performed during breath hold in a model of lung injury with three different protocols: standard spiral with 180 mAs tube current-time product (Spiral180), sequential with 20-mm distance between slices and either 180 mAs (Sequential180) or 50 mAs (Sequential50)...
December 2017: Intensive Care Medicine Experimental
https://www.readbyqxmd.com/read/28377563/breath-holding-as-a-specific-type-of-breathing-training-from-the-viewpoint-of-avicenna-authors-reply
#18
Grzegorz Bilo, Gianfranco Parati, Kalina Kawecka-Jaszcz
No abstract text is available yet for this article.
March 31, 2017: Polish Archives of Internal Medicine
https://www.readbyqxmd.com/read/28377562/breath-holding-as-a-specific-type-of-breathing-training-from-the-viewpoint-of-avicenna
#19
Narjes Gorji, Reihaneh Moeini, Seyyedali Mozaffarpour, Morteza Mojahedi
No abstract text is available yet for this article.
March 31, 2017: Polish Archives of Internal Medicine
https://www.readbyqxmd.com/read/28377138/daily-ct-guidance-improves-target-coverage-during-definitive-radiation-therapy-for-gastric-malt-lymphoma
#20
He Wang, Sarah A Milgrom, Bouthaina S Dabaja, Grace L Smith, Mary Martel, Chelsea C Pinnix
PURPOSE: Radiation therapy (RT) for gastric mucosa-associated lymphoid tissue (MALT) lymphoma is challenging because of variation in the stomach's position, size, and shape. We investigated the interfractional changes in stomach location, consequent dosimetric effects, and impact of daily computed tomography image guidance RT (CT-IGRT). METHODS AND MATERIALS: Twelve patients treated for gastric MALT lymphoma with intensity modulated radiation therapy, using a breath-hold technique and restriction of oral intake, were studied retrospectively...
March 6, 2017: Practical Radiation Oncology
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