Functional Lung Imaging during HFV in Preterm Rabbits
Publication Date
October 30, 2012
Journal
PLOS ONE
Authors
Jordan Thurgood, Stuart Hooper, Melissa Siew, Megan Wallace, et al
Volume
7
Issue
10
Pages
e48122
DOI
https://dx.plos.org/10.1371/journal.pone.0048122
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0048122
PubMed
http://www.ncbi.nlm.nih.gov/pubmed/23118938
PubMed Central
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3484156
Europe PMC
http://europepmc.org/abstract/MED/23118938
Web of Science
000310705600026
Scopus
84868088795
Mendeley
http://www.mendeley.com/research/functional-lung-imaging-during-hfv-preterm-rabbits
Events
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Mendeley | Further Information

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Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/552382"], "description"=>"<p>A) Time plots showing the tidal volume delivered as measured with a flowmeter and X-ray velocimetry integrated expansion. The X-ray velocimetry integrated expansion was calibrated to volume according to the method of Fouras et. al <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0048122#pone.0048122-Fouras3\" target=\"_blank\">[52]</a>. The coefficient of determination between the flowmeter and the X-ray velocimetry volume was &gt;0.96. The animal was being ventilated at PEEP of 9 cmH2O, PIP of 21 cmH2O and a frequency of 1 Hz. B) X-ray velocimetry integrated expansion maps calculated from the end expiration to early inspiration (i), mid-inspiration (ii) and end-inspiration (iii). The X-ray velocimetry integrated expansion maps correlate to the time indicated by the (x) symbols on the X-ray velocimetry time plot in A). It can clearly be seen that as inspiration progresses a greater amount of lung tissue expansion has occurred and the expansion maps are able to show where the changes have occurred with high spatial resolution.</p>", "links"=>[], "tags"=>["methods", "x-ray", "velocimetry"], "article_id"=>222865, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g003", "stats"=>{"downloads"=>3, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Temporal_measurement_of_lung_activity_via_traditional_methods_and_the_X_ray_velocimetry_technique_/222865", "title"=>"Temporal measurement of lung activity via traditional methods and the X-ray velocimetry technique.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:47:45"}
  • {"files"=>["https://ndownloader.figshare.com/files/552231"], "description"=>"<p>A) Average image of 10 phase contrast images of a rabbit pup taken with 2 ms exposures at a rate of 300 fps (1016×1016 pixels). The image shows the enhanced lung structure attained with this imaging technique. B) Vector map showing instantaneous lung motion between 2 subsequent images. A cross-correlation window size of 64×64 px and 75% window overlap was used, with only a quarter of the &gt;1000 vectors being shown for clarity. C) Map coloured according to the local lung tissue expansion at an instant in time, determined between 2 subsequent frames; red being largest and blue being smallest expansion values respectively.</p>", "links"=>[], "tags"=>["imaging"], "article_id"=>222722, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g002", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Information_determined_from_i_in_vivo_i_lung_imaging_and_analysis_technique_/222722", "title"=>"Information determined from <i>in vivo</i> lung imaging and analysis technique.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:45:22"}
  • {"files"=>["https://ndownloader.figshare.com/files/552769"], "description"=>"<p>The normalised minute expansion, calculated as X-ray velocimetry expansion activity multiplied by the frequency (in breaths per minute), is shown for the 5 animals and is normalised around the 1 Hz value to account for inter-animal effects. Each animal is marked by a different symbol. This term, analogous to the minute volume, shows the extent of expansion activity that occurs at each ventilation rate over the same interval of time. As the rate of ventilation is increased it can readily be seen that the total amount of expansion activity also increases, thus providing potential for improved airflow and gas mixing.</p>", "links"=>[], "tags"=>["physiology", "biotechnology", "Critical care and emergency medicine", "biophysics", "physics"], "article_id"=>223255, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g006", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Effect_of_frequency_on_the_minute_activity_/223255", "title"=>"Effect of frequency on the minute activity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:54:15"}
  • {"files"=>["https://ndownloader.figshare.com/files/294270", "https://ndownloader.figshare.com/files/294321"], "description"=>"<div><p>Although high frequency ventilation (HFV) is an effective mode of ventilation, there is limited information available in regard to lung dynamics during HFV. To improve the knowledge of lung function during HFV we have developed a novel lung imaging and analysis technique. The technique can determine complex lung motion information <em>in vivo</em> with a temporal resolution capable of observing HFV dynamics. Using high-speed synchrotron based phase contrast X-ray imaging and cross-correlation analysis, this method is capable of recording data in more than 60 independent regions across a preterm rabbit lung in excess of 300 frames per second (fps). This technique is utilised to determine regional intra-breath lung mechanics of preterm rabbit pups during HFV. Whilst ventilated at fixed pressures, each animal was ventilated at frequencies of 1, 3, 5 and 10 Hz. A 50% decrease in delivered tidal volume was measured at 10 Hz compared to 1 Hz, yet at the higher frequency a 500% increase in minute activity was measured. Additionally, HFV induced greater homogeneity of lung expansion activity suggesting this ventilation strategy potentially minimizes tissue damage and improves gas mixing. The development of this technique permits greater insight and further research into lung mechanics and may have implications for the improvement of ventilation strategies used to support severe pulmonary trauma and disease.</p> </div>", "links"=>[], "tags"=>["imaging", "hfv", "preterm", "rabbits"], "article_id"=>117946, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>[nil, nil], "stats"=>{"downloads"=>3, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Functional_Lung_Imaging_during_HFV_in_Preterm_Rabbits/117946", "title"=>"Functional Lung Imaging during HFV in Preterm Rabbits", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2012-10-30 02:12:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/552536"], "description"=>"<p>A) Effect of frequency on expansion activity normalised to the activity at 1 Hz for each animal to account for inter-animal effects. Each animal is marked by a different symbol. Overall we see a decrease in the magnitude of expansion activity for each respiration cycle as the ventilation frequency is increased. B) Expansion maps showing the effect of ventilation rate on activity of the lung throughout the ventilation cycle. As the ventilation rate is increased it can be seen that the expansion activity decreases. Expansion maps shown have over 1000 measurement locations in each map. Expansion activity, as shown here, is a dimensionless quantity.</p>", "links"=>[], "tags"=>["physiology", "biotechnology", "Critical care and emergency medicine", "biophysics", "physics"], "article_id"=>223020, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g004", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Effect_of_frequency_on_expansion_activity_/223020", "title"=>"Effect of frequency on expansion activity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:50:20"}
  • {"files"=>["https://ndownloader.figshare.com/files/552099"], "description"=>"<p>A) Experimental setup designed for the acquisition of synchrotron based phase contrast X-ray lung images with high spatial and temporal resolution (image modified from <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0048122#pone.0048122-Fouras3\" target=\"_blank\">[52]</a>). The set-up allows the acquisition of <i>in vivo</i> images with enhanced lung speckle, which provides detail necessary for a cross-correlation analysis. B) Cross-correlation analysis of images allows the determination of the displacement of lung tissue within each image interrogation region. The statistically most likely displacement for each respective window is determined as the displacement of lung tissue within that interrogation region. This is performed across the entire lung image, thus generating a vector field incorporating the entire lung.</p>", "links"=>[], "tags"=>["apparatus", "spatiotemporal"], "article_id"=>222589, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g001", "stats"=>{"downloads"=>3, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Method_and_apparatus_for_acquisition_of_high_spatiotemporal_resolution_i_in_vivo_i_information_/222589", "title"=>"Method and apparatus for acquisition of high spatiotemporal resolution <i>in vivo</i> information.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:43:09"}
  • {"files"=>["https://ndownloader.figshare.com/files/552632"], "description"=>"<p>Spatial standard deviation of expansion activity plotted against ventilator frequency, normalised by the value at 1 Hz for each animal to account for inter-animal effects. There is a decrease in expansion activity variation as the rate of ventilation is increased. Values for the 5 animals are shown and are normalised to the 1 Hz value to minimize inter-animal effects. Each animal is marked by a different symbol. A higher degree of spatial variation of expansion at lower frequencies suggests that with a longer time available for gas flow the distribution of expansion is primarily dependant on the local lung compliance. At the higher frequencies, with a limited time for expansion to occur, the expansion activity is more consistent across the lung as shown by a smaller standard deviation in the activity.</p>", "links"=>[], "tags"=>["deviation", "plotted", "ventilation"], "article_id"=>223119, "categories"=>["Medicine", "Biophysics", "Physics", "Biotechnology", "Physiology"], "users"=>["Jordan Thurgood", "Stuart Hooper", "Melissa Siew", "Megan Wallace", "Stephen Dubsky", "Marcus Kitchen", "R. Aidan Jamison", "Richard Carnibella", "Andreas Fouras"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0048122.g005", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Spatial_standard_deviation_of_expansion_plotted_against_ventilation_frequency_/223119", "title"=>"Spatial standard deviation of expansion plotted against ventilation frequency.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2012-10-30 00:51:59"}

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Relative Metric

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