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Respiratory imaging

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https://www.readbyqxmd.com/read/28526472/-functional-respiratory-imaging-after-neostigmine-or-sugammadex-enhanced-recovery-from-neuromuscular-blockade-in-the-anesthetised-rat-a-randomised-controlled-pilot-study
#1
Tom Schepens, Guy Cammu, Sabine Maes, Benny Desmedt, Wim Vos, Kristof Deseure
OBJECTIVES: Reductions in diaphragm activity are associated with the postoperative development of atelectasis. Neostigmine reversal is also associated with increased atelectasis. We assessed the effects of neostigmine, sugammadex, and spontaneous reversal on regional lung ventilation and airway flow. METHODS: Six Sprague-Dawley rats were paralysed with rocuronium and mechanically ventilated until recovery of the train-of-four ratio to 0.5. We administered neostigmine (0...
May 16, 2017: Revista Brasileira de Anestesiologia
https://www.readbyqxmd.com/read/28526309/antimicrobial-stewardship-for-hospitalized-patients-with-viral-respiratory-tract-infections
#2
Christopher F Lowe, Michael Payne, David Puddicombe, Allison Mah, Davie Wong, Allison Kirkwood, Mark W Hull, Victor Leung
BACKGROUND: The purpose of this study was to implement a targeted antimicrobial stewardship intervention for patients with a viral respiratory tract infection. METHODS: This was a quasi-experimental before and after audit and feedback intervention of adult inpatients with a positive polymerase chain reaction for a respiratory virus in 2 acute care hospitals in Vancouver, Canada. Audit and feedback was implemented based on 2 criteria: microbiology (no positive bacterial cultures) and chest imaging (absence of pneumonia or consolidation on radiology dictation)...
May 16, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28523329/respiratory-bronchiolitis-associated-interstitial-lung-disease-an-unexpected-form-of-idiopathic-interstitial-pneumonia-in-a-young-male
#3
Claudia Lucia Toma, Elena Danteş, Diana Gabriela Leonte, Ariadna Petronela Fildan
Cigarette smoking is the most frequently encountered risk factor for chronic obstructive pulmonary disease and lung cancer. The latest American Thoracic Society÷European Respiratory Society classification of idiopathic interstitial pneumonia includes two entities related to smoking habits: respiratory bronchiolitis-associated interstitial lung disease and desquamative interstitial pneumonia. The new approach to diagnosis is to combine pathological pattern with clinical and radiological data. Lung biopsy is no longer considered the "gold standard" for diagnosis, but as a part of the diagnosis, which shall be set only after the pulmonologist, radiologist and pathologist reviewed all clinical, imaging and pathological aspects...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28523179/a-case-of-video-assisted-thoracoscopic-resection-of-malignant-transformation-of-pulmonary-recurrent-respiratory-papillomatosis
#4
Dana A Dominguez, David T Martin, Jeffrey B Velotta
Recurrent respiratory papillomatosis (RRP) is a disease of the respiratory tract caused by infection with the human papillomavirus (HPV) and is characterized by multiple recurring papillomas throughout the respiratory tract. Although rare, extra laryngeal involvement carries the risk of malignant transformation in 3-7% of adults. We report the case of a patient with unmonitored juvenile onset RRP with pulmonary involvement found to have malignant transformation to squamous cell carcinoma (SCC). Incidentally found on chest radiography for mild chest wall trauma, she was found to have a large left lower lobe mass with pathology consistent with SCC...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28522765/exercise-training-in-tg%C3%AE-q-44-mice-during-the-progression-of-chronic-heart-failure-cardiac-vs-peripheral-soleus-muscle-impairments-to-oxidative-metabolism
#5
Bruno Grassi, Joanna Majerczak, Eleonora Bardi, Alessia Buso, Marina Comelli, Stefan Chlopicki, Magdalena Guzik, Irene Mavelli, Zenon Nieckarz, Desy Salvadego, Urszula Tyrankiewicz, Tomasz Skorka, Roberto Bottinelli, Jerzy A Zoladz, Maria Antonietta Pellegrino
Cardiac function, skeletal (soleus) muscle oxidative metabolism and the effects of exercise training were evaluated in a transgenic murine model (Tgαq*44) of chronic heart failure (CHF) during the critical period between the occurrence of an impairment of cardiac function and the stage at which overt cardiac failure ensues (i.e. from 10 to 12 months of age). Forty-eight Tgαq*44 mice and 43 wild-type (WT) FVB controls were randomly assigned to control groups and to groups undergoing 2 months of intense exercise training (spontaneous running on a instrumented wheel)...
May 18, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28522072/cardiovascular-magnetic-resonance-in-systemic-sclerosis-pearls-and-pitfalls
#6
REVIEW
Sophie I Mavrogeni, Juerg Schwitter, Luna Gargani, Alessia Pepe, Lorenzo Monti, Yannick Allanore, Marco Matucci-Cerinic
Systemic sclerosis (SSc) is an autoimmune disease characterized by vascular dysfunction and excessive fibrosis, involving internal organs including the heart. The estimated prevalence of cardiac involvement in SSc is high and remains subclinical until the late stages. It is either primary, related to myocardial inflammation and fibrosis, or secondary, due to pulmonary arterial hypertension (SSc-PAH) or systemic hypertension, in those patients with renal involvement. Cardiovascular magnetic resonance (CMR) is a useful tool for the early assessment of cardiac involvement in SSc...
March 31, 2017: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/28520558/data-driven-event-by-event-respiratory-motion-correction-using-tof-pet-list-mode-centroid-of-distribution
#7
Silin Ren, Xiao Jin, Chung Chan, Yiqiang Jian, Tim Mulnix, Chi Liu, Richard E Carson
Data-driven respiratory gating techniques were developed to correct for respiratory motion in PET studies, without the help of external motion tracking systems. Due to the greatly increased image noise in gated reconstructions, it is desirable to develop a data-driven event-by-event respiratory motion correction method. In this study, using the Centroid-of-distribution (COD) algorithm, we established a data-driven event-by-event respiratory motion correction technique using TOF PET list-mode data, and investigated its performance by comparing with an external system-based correction method...
May 18, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28518117/simultaneous-evaluation-of-cerebral-hemodynamics-and-light-scattering-properties-of-the-in-vivo-rat-brain-using-multispectral-diffuse-reflectance-imaging
#8
Izumi Nishidate, Afrina Mustari, Satoko Kawauchi, Shunichi Sato, Manabu Sato
The simultaneous evaluation of cerebral hemodynamics and the light scattering properties of in vivo rat brain tissue is demonstrated using a conventional multispectral diffuse reflectance imaging system. This system is constructed from a broadband white light source, a motorized filter wheel with a set of narrowband interference filters, a light guide, a collecting lens, a video zoom lens, and a monochromatic charged-coupled device (CCD) camera. An ellipsoidal cranial window is made in the skull bone of a rat under isoflurane anesthesia to capture in vivo multispectral diffuse reflectance images of the cortical surface...
May 7, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516050/towards-mri-temperature-mapping-in-real-time-the-proton-resonance-frequency-method-with-undersampled-radial-mri-and-nonlinear-inverse-reconstruction
#9
Zhongshuai Zhang, Thomas Michaelis, Jens Frahm
BACKGROUND: Optimal control of minimally invasive interventions by hyperthermia requires dynamic temperature mapping at high temporal resolution. METHODS: Based on the temperature-dependent shift of the proton resonance frequency (PRF), this work developed a method for real-time MRI thermometry which relies on highly undersampled radial FLASH MRI sequences with iterative image reconstruction by regularized nonlinear inversion (NLINV). As a first step, the method was validated with use of a temperature phantom and ex vivo organs (swine kidney) subjected to heating by warm water or a pulsed laser source...
April 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28515392/assessment-of-left-ventricular-function-and-mass-on-free-breathing-compressed-sensing-real-time-cine-imaging
#10
Tomoyuki Kido, Teruhito Kido, Masashi Nakamura, Kouki Watanabe, Michaela Schmidt, Christoph Forman, Teruhito Mochizuki
BACKGROUND: Compressed sensing (CS) cine magnetic resonance imaging (MRI) has the advantage of being inherently insensitive to respiratory motion. This study compared the accuracy of free-breathing (FB) CS and breath-hold (BH) standard cine MRI for left ventricular (LV) volume assessment.Methods and Results:Sixty-three patients underwent cine MRI with both techniques. Both types of images were acquired in stacks of 8 short-axis slices (temporal/spatial resolution, 41 ms/1.7×1.7×6 mm(3)) and compared for ejection fraction, end-diastolic and systolic volumes, stroke volume, and LV mass...
May 18, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28513922/impact-of-sampling-interval-in-training-data-acquisition-on-intrafractional-predictive-accuracy-of-indirect-dynamic-tumor-tracking-radiotherapy
#11
Nobutaka Mukumoto, Mitsuhiro Nakamura, Mami Akimoto, Yuki Miyabe, Kenji Yokota, Yukinori Matsuo, Takashi Mizowaki, Masahiro Hiraoka
PURPOSE: To explore the effect of sampling interval of training data acquisition on the intrafractional prediction error of surrogate signal-based dynamic tumor-tracking using a gimbal-mounted linac. MATERIALS AND METHODS: Twenty pairs of respiratory motions were acquired from 20 patients (ten lung, five liver, and five pancreatic cancer patients) who underwent dynamic tumor-tracking with the Vero4DRT. First, respiratory motions were acquired as training data for an initial construction of the prediction model before the irradiation...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28509566/respiratory-motion-during-90-yttrium-pet-contributes-to-underestimation-of-tumor-dose-and-overestimation-of-normal-liver-tissue-dose
#12
Line Ausland, Mona-Elisabeth Revheim, Arne Skretting, Caroline Stokke
Background Yttrium-90 dosimetry after radioembolization is reliant on accurate quantitative imaging of the microsphere deposition. Previous studies have focused on the correction of geometrical resolution effects. Purpose To uncover additional effects of respiratory motion. Material and Methods Mathematical models describing spherical tumors were formed and two blurring effects, limited geometrical resolution and respiratory motion, were simulated. The virtual images were used as basis for dose volume histogram estimations by convolving the radioactivity representations with a dose point kernel...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28503729/fully-integrated-3d-high-resolution-multicontrast-abdominal-pet-mr-with-high-scan-efficiency
#13
Christoph Kolbitsch, Radhouene Neji, Matthias Fenchel, Andrew Mallia, Paul Marsden, Tobias Schaeffter
PURPOSE: To provide 3D multicontrast anatomical MR with high isotropic resolution and metabolic positron emission tomography (PET) images using a respiratory motion-compensated simultaneous PET-MR examination with high scan efficiency. THEORY AND METHODS: Standard abdominal PET-MR examinations combine MR data obtained during multiple breath-holds with free-breathing PET acquisitions, limiting the achievable image resolution and potentially causing misalignment errors between breath-hold and free-breathing data...
May 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28501041/trauma-patient-with-fat-embolism-detected-on-computed-tomography
#14
Isabel Sousa, João Janeiro, Paula Campos, Isabel Távora
Fat embolism is frequent following fractures of long bones, however the development of the clinical syndrome of fat embolism (characterized by progressive respiratory distress, mental status depression and petechial rash) is rare, but relevant because of its potential severity. We report a case of a trauma patient with multiple fractures of the right lower limb in whom an emergency computed tomography scan showed fat emboli within the lumen of the homolateral common femoral vein. The imaging detection of macroscopic fat emboli should alert the clinician to the potential for subsequent fat embolism syndrome...
January 31, 2017: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28499810/prevalence-of-late-onset-pompe-disease-in-portuguese-patients-with-diaphragmatic-paralysis-dipper-study
#15
M J Guimarães, J C Winck, B Conde, A Mineiro, M Raposo, J Moita, A Marinho, J M Silva, N Pires, S André, C Loureiro
Pompe disease is a rare autosomal recessive neuromuscular disorder caused by acid α-glucosidase enzyme (GAA) deficiency and divided into two distinct variants, infantile- and late-onset. The late-onset variant is characterized by a spectrum of phenotypic variation that may range from asymptomatic, to reduced muscle strength and/or diaphragmatic paralysis. Since muscle strength loss is characteristic of several different conditions, which may also cause diaphragmatic paralysis, a protocol was created to search for the diagnosis of Pompe disease and exclude other possible causes...
May 9, 2017: Revista Portuguesa de Pneumologia
https://www.readbyqxmd.com/read/28497486/5d-whole-heart-sparse-mri
#16
Li Feng, Simone Coppo, Davide Piccini, Jerome Yerly, Ruth P Lim, Pier Giorgio Masci, Matthias Stuber, Daniel K Sodickson, Ricardo Otazo
PURPOSE: A 5D whole-heart sparse imaging framework is proposed for simultaneous assessment of myocardial function and high-resolution cardiac and respiratory motion-resolved whole-heart anatomy in a single continuous noncontrast MR scan. METHODS: A non-electrocardiograph (ECG)-triggered 3D golden-angle radial balanced steady-state free precession sequence was used for data acquisition. The acquired 3D k-space data were sorted into a 5D dataset containing separated cardiac and respiratory dimensions using a self-extracted respiratory motion signal and a recorded ECG signal...
May 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28494271/motion-robust-parameter-estimation-in-abdominal-diffusion-weighted-mri-by-simultaneous-image-registration-and-model-estimation
#17
Sila Kurugol, Moti Freiman, Onur Afacan, Liran Domachevsky, Jeannette M Perez-Rossello, Michael J Callahan, Simon K Warfield
Quantitative body DW-MRI can detect abdominal abnormalities as well as monitor response-to-therapy for applications including cancer and inflammatory bowel disease with increased accuracy. Parameter estimates are obtained by fitting a forward model of DW-MRI signal decay to the observed data acquired with several b-values. The DW-MRI signal decay models typically used do not account for respiratory, cardiac and peristaltic motion, however, which may deteriorate the accuracy and robustness of parameter estimates...
May 3, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28493110/bem-based-simulation-of-lung-respiratory-deformation-for-ct-guided-biopsy
#18
Dong Chen, Weisheng Chen, Lipeng Huang, Xuegang Feng, Terry Peters, Lixu Gu
PURPOSE: Accurate and real-time prediction of the lung and lung tumor deformation during respiration are important considerations when performing a peripheral biopsy procedure. However, most existing work focused on offline whole lung simulation using 4D image data, which is not applicable in real-time image-guided biopsy with limited image resources. In this paper, we propose a patient-specific biomechanical model based on the boundary element method (BEM) computed from CT images to estimate the respiration motion of local target lesion region, vessel tree and lung surface for the real-time biopsy guidance...
May 10, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28492712/lugol-s-iodine-chromoendoscopy-versus-narrow-band-image-enhanced-endoscopy-for-the-detection-of-esophageal-cancer-in-patients-with-stenosis-secondary-to-caustic-corrosive-agent-ingestion
#19
Caterina Maria Pia Simoni Pennachi, Diogo Turiani Hourneaux de Moura, Renato Bastos Pimenta Amorim, Hugo Gonçalo Guedes, Vivek Kumbhari, Eduardo Guimarães Hourneaux de Moura
BACKGROUND: The diagnosis of corrosion cancer should be suspected in patients with corrosive ingestion if after a latent period of negligible symptoms there is development of dysphagia, or poor response to dilatation, or if respiratory symptoms develop in an otherwise stable patient of esophageal stenosis. Narrow Band Imaging detects superficial squamous cell carcinoma more frequently than white-light imaging, and has significantly higher sensitivity and accuracy compared with white-light...
May 8, 2017: Arquivos de Gastroenterologia
https://www.readbyqxmd.com/read/28492418/clinical-feasibility-of-free-breathing-dynamic-t1-weighted-imaging-with-gadoxetic-acid-enhanced-liver-magnetic-resonance-imaging-using-a-combination-of-variable-density-sampling-and-compressed-sensing
#20
Jeong Hee Yoon, Mi Hye Yu, Won Chang, Jin-Young Park, Marcel Dominik Nickel, Yohan Son, Berthold Kiefer, Jeong Min Lee
OBJECTIVES: The purpose of the study was to investigate the clinical feasibility of free-breathing dynamic T1-weighted imaging (T1WI) using Cartesian sampling, compressed sensing, and iterative reconstruction in gadoxetic acid-enhanced liver magnetic resonance imaging (MRI). MATERIALS AND METHODS: This retrospective study was approved by our institutional review board, and the requirement for informed consent was waived. A total of 51 patients at high risk of breath-holding failure underwent dynamic T1WI in a free-breathing manner using volumetric interpolated breath-hold (BH) examination with compressed sensing reconstruction (CS-VIBE) and hard gating...
May 11, 2017: Investigative Radiology
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