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Pulmonary MRI

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https://www.readbyqxmd.com/read/29160020/comparison-of-quantitative-regional-ventilation-weighted-fourier-decomposition-mri-with-dynamic-fluorinated-gas-washout-mri-and-lung-function-testing-in-copd-patients
#1
Till F Kaireit, Marcel Gutberlet, Andreas Voskrebenzev, Julia Freise, Tobias Welte, Jens M Hohlfeld, Frank Wacker, Jens Vogel-Claussen
BACKGROUND: Ventilation-weighted Fourier decomposition-MRI (FD-MRI) has matured as a reliable technique for quantitative measures of regional lung ventilation in recent years, but has yet not been validated in COPD patients. PURPOSE/HYPOTHESIS: To compare regional fractional lung ventilation obtained by ventilation-weighted FD-MRI with dynamic fluorinated gas washout MRI ((19) F-MRI) and lung function test parameters. STUDY TYPE: Prospective study...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29158839/characterization-of-cardiac-dynamics-in-an-acute-myocardial-infarction-model-by-four-dimensional-optoacoustic-and-magnetic-resonance-imaging
#2
Hsiao-Chun Amy Lin, Xosé Luís Déan-Ben, Ivana Ivankovic, Melanie A Kimm, Katja Kosanke, Helena Haas, Reinhard Meier, Fabian Lohöfer, Moritz Wildgruber, Daniel Razansky
Extraction of murine cardiac functional parameters on a beat-by-beat basis is limited with the existing imaging modalities due to insufficient three-dimensional temporal resolution. Faster volumetric imaging methods enabling in vivo characterization of functional parameters are poised to advance cardiovascular research and provide a better understanding of the mechanisms underlying cardiac diseases. We present a new approach based on analyzing contrast-enhanced optoacoustic (OA) images acquired at high volumetric frame rate without using cardiac gating or other approaches for motion correction...
2017: Theranostics
https://www.readbyqxmd.com/read/29156475/transient-severe-respiratory-motion-artifacts-after-application-of-gadoxetate-disodium-what-we-currently-know
#3
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/29147768/non-invasive-methods-for-estimating-mpap-in-copd-using-cardiovascular-magnetic-resonance-imaging
#4
C S Johns, S Rajaram, D A Capener, C Oram, C Elliot, R Condliffe, D G Kiely, J M Wild, A J Swift
PURPOSE: Pulmonary hypertension (PH) is associated with a poor outcome in chronic obstructive pulmonary disease (COPD) and is diagnosed invasively. We aimed to assess the diagnostic accuracy and prognostic value of non-invasive cardiovascular magnetic resonance (CMR) models. METHODS: Patients with COPD and suspected PH, who underwent CMR and right heart catheter (RHC) were identified. Three candidate models were assessed: 1, CMR-RV model, based on right ventricular (RV) mass and interventricular septal angle; 2, CMR PA/RV includes RV mass, septal angle and pulmonary artery (PA) measurements; 3, the Alpha index, based on RV ejection fraction and PA size...
November 16, 2017: European Radiology
https://www.readbyqxmd.com/read/29143222/quantitative-analysis-of-the-level-of-readability-of-online-emergency-radiology-based-patient-education-resources
#5
David R Hansberry, Michael D'Angelo, Michael D White, Arpan V Prabhu, Mougnyan Cox, Nitin Agarwal, Sandeep Deshmukh
PURPOSE: The vast amount of information found on the internet, combined with its accessibility, makes it a widely utilized resource for Americans to find information pertaining to medical information. The field of radiology is no exception. In this paper, we assess the readability level of websites pertaining specifically to emergency radiology. METHODS: Using Google, 23 terms were searched, and the top 10 results were recorded. Each link was evaluated for its readability level using a set of ten reputable readability scales...
November 15, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/29119033/the-utility-of-mri-in-the-diagnosis-of-takayasu-arteritis
#6
Marian Gaballah, Rachelle Goldfisher, John B Amodio
Takayasu Arteritis (TA) is an inflammatory disorder involving the thoracoabdominal aorta and its branches and the pulmonary arteries, with eventual vascular stenosis, occlusion, or aneurysm formation. Conventional angiography has been the reference imaging standard for diagnosis of TA. The purpose of this case report is to demonstrate the utility of MR imaging and MR angiography in the diagnosis of Takayasu Arteritis in a pediatric patient. The patient is a 15-year-old female patient presenting with anemia, hypertension, and acute kidney injury...
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/29114616/detection-of-regional-radiation-induced-lung-injury-using-hyperpolarized-129-xe-chemical-shift-imaging-in-a-rat-model-involving-partial-lung-irradiation-proof-of-concept-demonstration
#7
Brandon Zanette, Elaine Stirrat, Salomeh Jelveh, Andrew Hope, Giles Santyr
Purpose: The purpose of this work was to use magnetic resonance imaging (MRI) of hyperpolarized (HP) (129)Xe dissolved in pulmonary tissue (PT) and red blood cells (RBCs) to detect regional changes to PT structure and perfusion in a partial-lung rat model of radiation-induced lung injury and compare with histology. Methods and materials: The right medial region of the lungs of 6 Sprague-Dawley rats was irradiated (20 Gy, single-fraction). A second nonirradiated cohort served as the control group...
July 2017: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/29107823/photodynamic-therapy-for-an-iris-metastasis-from-pulmonary-adenocarcinoma
#8
Yanyan Chen, Yuedong Hu
Uveal metastasis is the most common intraocular malignancy. Lung cancer is one of the most common malignancies that metastasize to uvea. Iris involvement is rarely reported. Here we report a case of iris metastasis from pulmonary adenocarcinoma that was treated with photodynamic therapy (PDT). A 65-year-old Chinese man was referred to our hospital for iris white neoplasm and blurred vision for 2 weeks in his right eye. His accepted pulmonary lobectomy, radiotherapy and chemotherapy for pulmonary adenocarcinoma 1year ago and liver metastases were found 2 months earlier...
October 28, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29103786/reduced-paraspinous-muscle-area-is-associated-with-post-colectomy-complications-in-children-with-ulcerative-colitis
#9
Priya H Dedhia, Yasmine White, Jonathan R Dillman, Jeremy Adler, Marcus D Jarboe, Daniel H Teitelbaum, Ronald B Hirschl, Samir K Gadepalli
BACKGROUND AND OBJECTIVES: Sarcopenia, defined as reduced muscle mass, is typically assessed by CT scans, which are infrequently performed in children. Using MRI to measure sarcopenia, we determined the association with postoperative complications after colectomy for ulcerative colitis (UC). METHODS: Clinical and preoperative MRI data for 13-18-year-old UC patients who underwent colectomy were retrospectively reviewed. Bilateral paraspinous muscle area (PSMA) and psoas muscle area (PMA) at L3 vertebra were measured and averaged...
September 14, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29091021/presence-of-reduced-regional-left-ventricular-function-even-in-the-absence-of-left-ventricular-wall-scar-tissue-in-the-long-term-after-repair-of-an-anomalous-left-coronary-artery-from-the-pulmonary-artery
#10
Sarah Nordmeyer, Boris Schmitt, Boris Nasseri, Vladimir Alexi-Meskishvili, Titus Kuehne, Felix Berger, Johannes Nordmeyer
BACKGROUND: We sought to assess left ventricular regional function in patients with and without left ventricular wall scar tissue in the long term after repair of an anomalous origin of the left coronary artery from the pulmonary artery. METHODS: A total of 20 patients aged 12.8±7.4 years were assessed 10 (0.5-17) years after the repair of an anomalous origin of the left coronary artery from the pulmonary artery; of them, 10 (50%) patients showed left ventricular wall scar tissue on current cardiac MRI...
November 1, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/29079842/experimental-imaging-in-orthotopic-renal-cell-carcinoma-xenograft-models-comparative-evaluation-of-high-resolution-3d-ultrasonography-in-vivo-micro-ct-and-9-4t-mri
#11
Johannes Linxweiler, Christina Körbel, Andreas Müller, Eva Jüngel, Roman Blaheta, Joana Heinzelmann, Michael Stöckle, Kerstin Junker, Michael D Menger, Matthias Saar
In this study, we aimed to comparatively evaluate high-resolution 3D ultrasonography (hrUS), in-vivo micro-CT (μCT) and 9.4T MRI for the monitoring of tumor growth in an orthotopic renal cell carcinoma (RCC) xenograft model since there is a lack of validated, non-invasive imaging tools for this purpose. 1 × 10(6) Caki-2 RCC cells were implanted under the renal capsule of 16 immunodeficient mice. Local and systemic tumor growth were monitored by regular hrUS, μCT and MRI examinations. Cells engrafted in all mice and gave rise to exponentially growing, solid tumors...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29074315/basal-cell-carcinoma-of-the-scalp-with-destruction-and-invasion-into-the-calvarium-and-dura-mater-report-of-7-cases-and-review-of-literature
#12
Churl-Su Kwon, Omar Al Awar, Valeria Ripa, Ghassan Said, Saulius Rocka
Basal cell carcinoma (BCC) is the most common skin malignancy in humans. Giant BCC is a rarer entity that is characterised by aggressive biological behaviour. Intracranial invasion by a BCC on the scalp is extremely rare. The gold standard treatment of BCCs is represented by surgical excision with a wide variety of reconstructive techniques. In this paper, we describe the largest series to date of recurrent BCCs with intracranial extension involving the dura mater. We report recurrent giant BCC of the scalp with dura mater invasion in 7 patients...
October 23, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29052774/intrathoracic-tuberculous-lymphadenopathy-in-children-a-guide-to-chest-radiography
#13
REVIEW
Anthony George, Savvas Andronikou, Tanyia Pillay, Pierre Goussard, Heather J Zar
Making the diagnosis of pulmonary tuberculosis in children can be difficult because microbiological confirmation is not often achieved. Diagnosis is therefore often based on clinical features in combination with chest radiograph findings. Chest radiographs can demonstrate lymphadenopathy of the hilar and para-tracheal regions on the anteroposterior view, and subcarinal lymphadenopathy on the lateral view. However poor interobserver agreement has been reported for radiologist and clinician assessment of lymphadenopathy...
September 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/29051040/on-the-potential-role-of-mri-biomarkers-of-copd-to-guide-bronchoscopic-lung-volume-reduction
#14
Colin J Adams, Dante P I Capaldi, Robert Di Cesare, David G McCormack, Grace Parraga
RATIONALE AND OBJECTIVES: In patients with severe emphysema and poor quality of life, bronchoscopic lung volume reduction (BLVR) may be considered and guided based on lobar emphysema severity. In particular, x-ray computed tomography (CT) emphysema measurements are used to identify the most diseased and the second-most diseased lobes as BLVR targets. Inhaled gas magnetic resonance imaging (MRI) also provides chronic obstructive pulmonary disease (COPD) biomarkers of lobar emphysema and ventilation abnormalities...
October 16, 2017: Academic Radiology
https://www.readbyqxmd.com/read/29043395/measuring-flow-hemodynamic-indices-and-oxygen-consumption-in-children-with-pulmonary-hypertension-a-comparison-of-catheterization-and-phase-contrast-mri
#15
Michal Schäfer, Uyen Truong, Lorna P Browne, Gareth J Morgan, Michael Ross, Richard Ing, Kendall S Hunter, Vitaly O Kheyfets, Steven H Abman, D Dunbar Ivy, Neil Wilson
We sought to compare pulmonary flow hemodynamic indices obtained by Fick and thermodilution catheterization techniques with phase-contrast MRI (PC-MRI) in children with diverse etiologies of pulmonary arterial hypertension (PAH). Calculation of pulmonary flow ([Formula: see text]) using the Fick principle in most catheter laboratories relies on an estimate of oxygen consumption which may limit its reliability. Flow hemodynamic indices acquired from thirty patients with PAH who underwent successful same-day PC-MRI and catheterization were evaluated for absolute and percent bias...
October 17, 2017: Pediatric Cardiology
https://www.readbyqxmd.com/read/29037603/mri-and-ct-lung-biomarkers-towards-an-in-vivo-understanding-of-lung-biomechanics
#16
REVIEW
Heather M Young, Rachel L Eddy, Grace Parraga
BACKGROUND: The biomechanical properties of the lung are necessarily dependent on its structure and function, both of which are complex and change over time and space. This makes in vivo evaluation of lung biomechanics and a deep understanding of lung biomarkers, very challenging. In patients and animal models of lung disease, in vivo evaluations of lung structure and function are typically made at the mouth and include spirometry, multiple-breath gas washout tests and the forced oscillation technique...
September 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29037314/pulmonary-magnetic-resonance-imaging-is-similar-to-chest-tomography-in-detecting-inflammation-in-patients-with-systemic-sclerosis
#17
Carolina de Souza Müller, Danny Warszawiak, Eduardo Dos Santos Paiva, Dante Luiz Escuissato
Interstitial lung disease (ILD) and pulmonary arterial hypertension (PAH) are prevalent complications of systemic sclerosis (SSc) and are currently the leading causes of death related to the disease. The accurate recognition of these conditions is therefore of utmost importance for patient management. A study was carried out with 24 SSc patients being followed at the Rheumatology Department of the Hospital de Clínicas of Universidade Federal do Paraná (UFPR) and 14 healthy volunteers, with the objective of evaluating the usefulness of lung magnetic resonance imaging (MRI) when assessing ILD in SS patients...
September 2017: Revista Brasileira de Reumatologia
https://www.readbyqxmd.com/read/29034509/3d-diffusion-weighted-129-xe-mri-for-whole-lung-morphometry
#18
Ho-Fung Chan, Neil J Stewart, Graham Norquay, Guilhem J Collier, Jim M Wild
PURPOSE: To obtain whole lung morphometry measurements from (129) Xe in a single breath-hold with 3D multiple b-value (129) Xe diffusion-weighted MRI (DW-MRI) with an empirically optimized diffusion time and compressed sensing for scan acceleration. METHODS: Prospective three-fold undersampled 3D multiple b-value hyperpolarized (129) Xe DW-MRI datasets were acquired, and the diffusion time (Δ) was iterated so as to provide diffusive length scale (LmD ) estimates from the stretched exponential model (SEM) that are comparable to those from (3) He...
October 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29034496/clinical-impact-of-the-microembolic-signal-burden-during-catheter-ablation-for-atrial-fibrillation-just-a-lot-of-noise
#19
Christian von Bary, Thomas Deneke, Thomas Arentz, Anja Schade, Heiko Lehrmann, Susanne Schwab-Malek, Sabine Fredersdorf, Dobri Baldaranov, Lars Maier, Felix Schlachetzki
OBJECTIVES: Microembolic signal detection by transcranial Doppler ultrasonography may be considered a surrogate for cerebral events during invasive cardiac procedures. However, the impact of the microembolic signal count during pulmonary vein isolation on the clinical outcome is not well evaluated. We investigated the effect of the microembolic signal count on the occurrence of new silent cerebral embolism measured by diffusion-weighted imaging (DWI)-magnetic resonance imaging (MRI), changes in neuropsychological testing, and the occurrence of clinical events during long-term follow-up after pulmonary vein isolation...
October 16, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29033887/atypical-cerebral-manifestations-of-disseminated-mycobacterium-tuberculosis
#20
Ji Hye Hwang, Kyung Mi Lee, Ji Eun Park, Hyug-Gi Kim, Eui Jong Kim, Woo Suk Choi, Na Rae Yang
BACKGROUND: We investigated the patterns of cerebral manifestations in patients with underlying pulmonary or extrapulmonary tuberculosis or disseminated tuberculosis. MATERIALS AND METHODS: From January 2010 to September 2016, brain magnetic resonance imaging (MRI) scans were obtained to evaluate cerebral manifestations in patients with underlying pulmonary or extrapulmonary tuberculosis. We also included patients with drug-resistant tuberculosis or disseminated tuberculosis...
2017: Frontiers in Neurology
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