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https://www.readbyqxmd.com/read/29433494/incidental-finding-of-large-pneumothorax-on-cardiac-mr-scan
#1
J P M Andrews, G McKillop, M R Dweck
BACKGROUND: We believe this is the first case report of a pneumothorax being identified using cardiac magnetic resonance imaging. This case also illustrates the haemodynamic effect a large pneumothorax can have on right ventricular filling in diastole. CASE PRESENTATION: A 26-year-old attended for an interval follow up Cardiac Magnetic Resonance (CMR) of his thoracic aorta after a thoracic co-arctation repair aged 3. He was found to have an incidental large pneumothorax by the reporting cardiology fellow which was confirmed by the on-call radiologist...
February 12, 2018: BMC Medical Imaging
https://www.readbyqxmd.com/read/29427389/in-vivo-self-gated-23-na-mri-at-7-t-using-an-oval-shaped-body-resonator
#2
Tanja Platt, Reiner Umathum, Thomas M Fiedler, Armin M Nagel, Andreas K Bitz, Florian Maier, Peter Bachert, Mark E Ladd, Mark O Wielpütz, Hans-Ulrich Kauczor, Nicolas G R Behl
PURPOSE: This work faces three challenges of sodium (23 Na) torso MRI on the way to quantitative 23 Na MRI: Development of a 23 Na radiofrequency transmit and receive coil covering a large part of the human body in width and length for 23 Na MRI at 7 T; reduction of blurring due to respiration in free-breathing 23 Na MRI using a self-gating approach; and reduction of image noise using a compressed-sensing reconstruction. METHODS: An oval-shaped birdcage resonator with a large field of view of (400 mm)3 and a homogeneous transmit and receive field distribution was designed, simulated, and implemented on a 7T MR system...
February 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29419953/-the-role-of-fetal-magnetic-resonance-imaging-in-the-study-of-congenital-diaphragmatic-hernia
#3
V Núñez, M Romo, J L Encinas, A Bueno, B Herrero, E Antolín, L Martínez, M López Santamaría
INTRODUCTION AND OBJECTIVES: Different echographic and fetal magnetic resonance (MRI) measurements have been described in the diagnosis of associated malformations and the prognosis of congenital diaphragmatic hernia (CDH). We have reviewed our experience searching for useful isolated or combined parameters and how MRI can complement ultrasound. MATERIAL AND METHODS: We evaluated 29 fetuses with CDH. We examined ultrasonography: Lung to Head (LHR o/e) and in MRI: ipsilateral lung volume (IPV) and total expressed as percentage of observed / expected lung volume (VPT o/e) and percentage of herniated liver (PHH)...
February 1, 2018: Cirugía Pediátrica: Organo Oficial de la Sociedad Española de Cirugía Pediátrica
https://www.readbyqxmd.com/read/29379990/-pet-mri
#4
REVIEW
Bettina Beuthien-Baumann
CLINICAL/METHODICAL ISSUE: Magnet resonance imaging (MRI) is an excellent anatomical reference method for the combination with positron emission tomography (PET). But MRI does not produce data, which can be directly used for attenuation correction of PET data, potentially compromising quantitative accuracy of PET. STANDARD RADIOLOGICAL METHODS: Hybrid-positron emission tomography/computed tomography (PET/CT) is an established standard diagnostic tool, particularly for staging and restaging in oncology...
January 29, 2018: Der Radiologe
https://www.readbyqxmd.com/read/29362281/-takotsubo-cardiomyopathy-and-neurogenic-pulmonary-edema-following-fibrinolytic-therapy-for-embolic-stroke-a-case-report
#5
Takehiro Kitagawa, Junkoh Yamamoto, Makoto Kureshima, Hitoshi Maeda, Shigeru Nishizawa
A 79-year-old man presented with left hemiparesis and disturbance of consciousness. Brain magnetic resonance(MR)imaging revealed an infarction in the right insular cortex. MR angiography showed a defect in the inferior trunk of the right middle cerebral artery. The patient was treated with alteplase about 2.5 h after onset. Immediately after the intravenous alteplase administration, the hemiparesis improved. However, his respiratory condition unexpectedly worsened 10 h after onset. Chest radiography demonstrated an infiltrative shadow in both lung fields...
January 2018: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/29361370/correlating-liver-stiffness-with-disease-severity-scoring-system-ds3-values-in-gaucher-disease-type-1-gd1-patients
#6
Suraj D Serai, Anjani P Naidu, T Andrew Burrow, Carlos E Prada, Stavra Xanthakos, Alexander J Towbin
Gaucher disease (GD) is an autosomal-recessive lysosomal storage disease caused by a deficiency of the enzyme, glucocerebrocidase, resulting in accumulation of lipid-laden storage cells in multiple organs such as bone marrow, liver, spleen, and lungs. Type 1 Gaucher disease is the most common form of this condition in which the brain and spinal cord (the central nervous system) are not affected. The Gaucher disease severity scoring system (GD-DS3) is typically used to assess disease severity accounting for skeletal, hematologic, and visceral disease...
January 5, 2018: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/29360149/audiovisual-biofeedback-improves-the-correlation-between-internal-external-surrogate-motion-and-lung-tumor-motion
#7
Danny Lee, Peter B Greer, Chiara Paganelli, Joanna Ludbrook, Taeho Kim, Paul Keall
PURPOSE: Breathing management can reduce breath-to-breath (intra-fraction) and day-by-day (inter-fraction) variability in breathing motion whilst utilizing the respiratory motion of internal and external surrogates for respiratory guidance. Audiovisual (AV) biofeedback, an interactive personalized breathing motion management system, has been developed to improve reproducibility of intra- and inter-fraction breathing motion. However, the assumption of the correlation of respiratory motion between surrogates and tumors is not always verified during medical imaging and radiation treatment...
January 23, 2018: Medical Physics
https://www.readbyqxmd.com/read/29354012/in-vivo-visualization-of-iron-oxide-enhancement-in-focal-pulmonary-inflammatory-lesions-using-a-three-dimensional-radial-gradient-echo-based-ultrashort-echo-time-sequence-a-preliminary-study
#8
Soon Ho Yoon, Chanhee Lee, Jinil Park, Jin Mo Goo, Jang-Yeon Park
Objective: To preliminarily evaluate technical feasibility of a dual-echo ultrashort echo time (UTE) subtraction MR imaging by using concurrent dephasing and excitation (CODE) sequence for visualization of iron-oxide enhancement in focal inflammatory pulmonary lesions. Materials and Methods: A UTE pulmonary MR imaging before and after the injection of clinically usable superparamagnetic iron-oxide nanoparticles, ferumoxytol, was conducted using CODE sequence with dual echo times of 0...
January 2018: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/29349867/volumetric-modulated-arc-therapy-treatment-planning-of-thoracic-vertebral-metastases-using-stereotactic-body-radiotherapy
#9
Matthew Mallory, Damodar Pokhrel, Rajeev Badkul, Hongyu Jiang, Christopher Lominska, Fen Wang
PURPOSE/OBJECTIVES: To retrospectively evaluate the plan quality, treatment efficiency, and accuracy of volumetric modulated arc therapy (VMAT) plans for thoracic spine metastases using stereotactic body radiotherapy (SBRT). MATERIALS/METHODS: Seven patients with thoracic vertebral metastases treated with noncoplanar hybrid arcs (NCHA) (1 to 2 3D-conformal partial arcs +7 to 9 IMRT beams) were re-optimized with VMAT plans using three coplanar arcs. Tumors were located between T2 and T7 and PTVs ranged between 24...
January 19, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29345242/joint-estimation-of-activity-and-attenuation-for-pet-using-pragmatic-mr-based-prior-application-to-clinical-tof-pet-mr-whole-body-data-for-fdg-and-non-fdg-tracers
#10
Sangtae Ahn, Lishui Cheng, Dattesh D Shanbhag, Hua Qian, Sandeep S Kaushik, Floris P Jansen, Florian Wiesinger
Accurate and robust attenuation correction remains challenging in hybrid PET/MR particularly for torsos because it is difficult to segment bones, lungs and internal air in MR images. Additionally, MR suffers from susceptibility artifacts when a metallic implant is present. Recently, joint estimation (JE) of activity and attenuation based on PET data, also known as maximum likelihood reconstruction of activity and attenuation (MLAA), has gained considerable interest because of (1) its promise to address the challenges in MR-based attenuation correction (MRAC), and (2) recent advances in time-of-flight (TOF) technology, which is known to be the key to the success of JE...
January 18, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29299166/early-morphological-change-for-predicting-outcome-in-metastatic-colorectal-cancer-after-regorafenib
#11
Hiroyuki Arai, Kunihisa Miyakawa, Tadamichi Denda, Takuro Mizukami, Yoshiki Horie, Naoki Izawa, Mami Hirakawa, Takashi Ogura, Takashi Tsuda, Yu Sunakawa, Takako Eguchi Nakajima
Background and Objective: It is unclear whether early morphological change (EMC) is a predictive marker for regorafenib in metastatic colorectal cancer (mCRC). Therefore, the present study investigated whether EMC can predict the outcome of mCRC patients receiving regorafenib. Results: This study evaluated 68 patients. Among 52 patients with lung metastasis, 16 (31%) had cavity formation (CF). The median progression-free survival (PFS) and overall survival (OS) in patients with/without CF were 4...
December 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/29290827/local-intratracheal-delivery-of-perfluorocarbon-nanoparticles-to-lung-cancer-demonstrated-with-magnetic-resonance-multimodal-imaging
#12
Lina Wu, Xiaofei Wen, Xiance Wang, Chunan Wang, Xilin Sun, Kai Wang, Huiying Zhang, Todd Williams, Allen J Stacy, Junjie Chen, Anne H Schmieder, Gregory M Lanza, Baozhong Shen
Eighty percent of lung cancers originate as subtle premalignant changes in the airway mucosal epithelial layer of bronchi and alveoli, which evolve and penetrate deeper into the parenchyma. Liquid-ventilation, with perfluorocarbons (PFC) was first demonstrated in rodents in 1966 then subsequently applied as lipid-encapsulated PFC emulsions to improve pulmonary function in neonatal infants suffering with respiratory distress syndrome in 1996. Subsequently, PFC nanoparticles (NP) were extensively studied as intravenous (IV) vascular-constrained nanotechnologies for diagnostic imaging and targeted drug delivery applications...
2018: Theranostics
https://www.readbyqxmd.com/read/29279157/pulmonary-nodule-detection-in-oncological-patients-value-of-respiratory-triggered-periodically-rotated-overlapping-parallel-t2-weighted-imaging-evaluated-with-pet-ct-mr
#13
Felipe de Galiza Barbosa, Jan Henning Geismar, Gaspar Delso, Michael Messerli, Martin Huellner, Paul Stolzmann, Patrick Veit-Haibach
PURPOSE: To prospectively evaluate the detection and conspicuity of pulmonary nodules in an oncological population, using a tri-modality PET/CT-MR protocol including a respiration-gated T2-PROPELLER sequence for possible integration into a simultaneous PET/MR protocol. METHODS: 149 patients referred for staging of malignancy were prospectively enrolled in this single-center study. Imaging was performed on a tri-modality PET/CT-MR setup and was comprised of PET/CT and 3T-MR imaging with 3D dual-echo GRE pulse sequence (Dixon) and an axial respiration-gated T2-weighted PROPELLER (T2-P) sequence...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29243669/simultaneous-tumor-and-surrogate-motion-tracking-with-dynamic-mri-for-radiation-therapy-planning
#14
Seyoun Park, Rana Farah, Steven M Shea, Erik J Tryggestad, Russell Hales, Junghoon Lee
Respiration-induced tumor motion is a major obstacle for achieving high-precision radiotherapy of cancers in the thoracic and abdominal regions. Surrogate-based estimation and tracking methods are commonly used in radiotherapy, but with limited understanding of quantified correlation to tumor motion. In this study, we propose a method to simultaneously track the lung tumor and external surrogates to evaluate their spatial correlation in a quantitative way using dynamic MRI, which allows real-time acquisition without ionizing radiation exposure...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29243665/anthropomorphic-thorax-phantom-for-cardio-respiratory-motion-simulation-in-tomographic-imaging
#15
Konstantin Bolwin, Björn Czekalla, Lynn Johann Frohwein, Florian Buther, Klaus P Schäfers
Patient motion during medical imaging using techniques such as computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), or single emission computed tomography (SPECT) is well known to degrade images leading to blurring effects or severe artifacts. Motion correction methods try to overcome this degrading effects. However, they need to be validated under realistic conditions. In the present work, a sophisticated anthropomorphic thorax phantom is presented that combines several aspects of a simulator for cardio-respiratory motion...
December 15, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29224995/evaluation-of-alkylating-pyrrole-imidazole-polyamide-conjugates-by-a-novel-method-for-high-throughput-sequencer
#16
Gengo Kashiwazaki, Rina Maeda, Takashi Kawase, Kaori Hashiya, Toshikazu Bando, Hiroshi Sugiyama
N-Methylpyrrole-N-methylimidazole (PI) polyamides are a class of DNA minor groove binders with DNA sequence-specificity. DNA-alkylating PI polyamide conjugates are attractive candidates as anticancer drugs acting through DNA damage and its subsequent inhibition of cell proliferation. One example is a chlorambucil-PI polyamide conjugate targeting the runt-related transcription factor (RUNX) family. RUNX1 has pro-oncogenic properties in acute myeloid leukemia, and recently the chlorambucil-PI polyamide conjugate was demonstrated to have anticancer effects...
November 29, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/29218271/magnetic-resonance-imaging-in-precision-radiation-therapy-for-lung-cancer
#17
REVIEW
Hannah Bainbridge, Ahmed Salem, Rob H N Tijssen, Michael Dubec, Andreas Wetscherek, Corinne Van Es, Jose Belderbos, Corinne Faivre-Finn, Fiona McDonald
Radiotherapy remains the cornerstone of curative treatment for inoperable locally advanced lung cancer, given concomitantly with platinum-based chemotherapy. With poor overall survival, research efforts continue to explore whether integration of advanced radiation techniques will assist safe treatment intensification with the potential for improving outcomes. One advance is the integration of magnetic resonance imaging (MRI) in the treatment pathway, providing anatomical and functional information with excellent soft tissue contrast without exposure of the patient to radiation...
December 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/29216302/resource-utilization-in-lung-cancer-diagnostic-procedures-current-use-and-budget-consequences
#18
Sander Brinkhof, Harry J M Groen, Sabine S Siesling, Maarten J IJzerman
OBJECTIVES: The main objective of this study is to determine the current use of lung cancer diagnostic procedures in two large hospitals in the Netherlands, to explore deviations in guideline adherence between the hospitals, and to estimate the budget impact of the diagnostic work-up as well as the over- and underutilization. MATERIALS & METHODS: A state transition model for the diagnostic pathway for lung cancer patients was developed using existing clinical practice guidelines (CPG) combined with a systematic literature...
2017: PloS One
https://www.readbyqxmd.com/read/29211913/single-centre-study-of-therapeutic-drug-monitoring-of-posaconazole-in-lung-transplant-recipients-factors-affecting-trough-plasma-concentrations
#19
Wirawan Jeong, Gregory I Snell, Bronwyn J Levvey, Glen P Westall, C Orla Morrissey, Rory Wolfe, Steven Ivulich, Chin Fen Neoh, Monica A Slavin, David C M Kong
Objectives: This study describes therapeutic drug monitoring (TDM) of posaconazole suspension and modified release (MR) tablets in lung transplant (LTx) recipients and evaluates factors that may affect posaconazole trough plasma concentration (Cmin). Methods: A single-centre, retrospective study evaluating posaconazole Cmin in LTx recipients receiving posaconazole suspension or MR tablets between January 2014 and December 2016. Results: Forty-seven LTx patients received posaconazole suspension, and 78 received the MR tablet formulation; a total of 421 and 617 Cmin measurements were made, respectively...
December 2, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29190998/radiological-and-nuclear-medicine-imaging-of-sarcoidosis
#20
Anna R Larici, Andor W Glaudemans, Annemilia Del Ciello, Riemer H Slart, Lucio Calandriello, Olivier Gheysens
Sarcoidosis is a multisystem chronic inflammatory disease of unknown etiology characterized by widespread growth of non-caseating granulomas. The diagnosis of sarcoidosis is based on clinical and imaging presentation, histologic confirmation and the absence of alternative diseases. Radiology and Nuclear Medicine play an essential role in the diagnostic work-up of patients with sarcoidosis to assess disease extent and activity. In addition, imaging modalities have shown their potential in managing these patients in terms of treatment response and prognostic assessment...
November 30, 2017: Quarterly Journal of Nuclear Medicine and Molecular Imaging
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