Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging
<p>Abstract</p> <p>Background</p> <p>Hyperpolarised helium MRI (He3 MRI) is a new technique that enables imaging of the air distribution within the lungs. This allows accurate determination of the ventilation distribution <it>in vivo</it>. The technique has...
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doaj-697627dc85b34f51b21b8782435928a12020-11-24T22:00:49ZengBMCBioMedical Engineering OnLine1475-925X2012-09-011116810.1186/1475-925X-11-68Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imagingDunster Kimble RFriese Marlies EJFraser John FGalloway Graham JCowin Gary JSchibler Andreas<p>Abstract</p> <p>Background</p> <p>Hyperpolarised helium MRI (He3 MRI) is a new technique that enables imaging of the air distribution within the lungs. This allows accurate determination of the ventilation distribution <it>in vivo</it>. The technique has the disadvantages of requiring an expensive helium isotope, complex apparatus and moving the patient to a compatible MRI scanner. Electrical impedance tomography (EIT) a non-invasive bedside technique that allows constant monitoring of lung impedance, which is dependent on changes in air space capacity in the lung. We have used He3MRI measurements of ventilation distribution as the gold standard for assessment of EIT.</p> <p>Methods</p> <p>Seven rats were ventilated in supine, prone, left and right lateral position with 70% helium/30% oxygen for EIT measurements and pure helium for He3 MRI. The same ventilator and settings were used for both measurements. Image dimensions, geometric centre and global in homogeneity index were calculated.</p> <p>Results</p> <p>EIT images were smaller and of lower resolution and contained less anatomical detail than those from He3 MRI. However, both methods could measure positional induced changes in lung ventilation, as assessed by the geometric centre. The global in homogeneity index were comparable between the techniques.</p> <p>Conclusion</p> <p>EIT is a suitable technique for monitoring ventilation distribution and inhomgeneity as assessed by comparison with He3 MRI.</p> http://www.biomedical-engineering-online.com/content/11/1/68Electrical impedance tomographyHyperpolarized helium magnetic resonance lmagingVentilation distributionFunctional lung imaging |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dunster Kimble R Friese Marlies EJ Fraser John F Galloway Graham J Cowin Gary J Schibler Andreas |
spellingShingle |
Dunster Kimble R Friese Marlies EJ Fraser John F Galloway Graham J Cowin Gary J Schibler Andreas Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging BioMedical Engineering OnLine Electrical impedance tomography Hyperpolarized helium magnetic resonance lmaging Ventilation distribution Functional lung imaging |
author_facet |
Dunster Kimble R Friese Marlies EJ Fraser John F Galloway Graham J Cowin Gary J Schibler Andreas |
author_sort |
Dunster Kimble R |
title |
Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
title_short |
Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
title_full |
Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
title_fullStr |
Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
title_full_unstemmed |
Ventilation distribution in rats: Part 2 – A comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
title_sort |
ventilation distribution in rats: part 2 – a comparison of electrical impedance tomography and hyperpolarised helium magnetic resonance imaging |
publisher |
BMC |
series |
BioMedical Engineering OnLine |
issn |
1475-925X |
publishDate |
2012-09-01 |
description |
<p>Abstract</p> <p>Background</p> <p>Hyperpolarised helium MRI (He3 MRI) is a new technique that enables imaging of the air distribution within the lungs. This allows accurate determination of the ventilation distribution <it>in vivo</it>. The technique has the disadvantages of requiring an expensive helium isotope, complex apparatus and moving the patient to a compatible MRI scanner. Electrical impedance tomography (EIT) a non-invasive bedside technique that allows constant monitoring of lung impedance, which is dependent on changes in air space capacity in the lung. We have used He3MRI measurements of ventilation distribution as the gold standard for assessment of EIT.</p> <p>Methods</p> <p>Seven rats were ventilated in supine, prone, left and right lateral position with 70% helium/30% oxygen for EIT measurements and pure helium for He3 MRI. The same ventilator and settings were used for both measurements. Image dimensions, geometric centre and global in homogeneity index were calculated.</p> <p>Results</p> <p>EIT images were smaller and of lower resolution and contained less anatomical detail than those from He3 MRI. However, both methods could measure positional induced changes in lung ventilation, as assessed by the geometric centre. The global in homogeneity index were comparable between the techniques.</p> <p>Conclusion</p> <p>EIT is a suitable technique for monitoring ventilation distribution and inhomgeneity as assessed by comparison with He3 MRI.</p> |
topic |
Electrical impedance tomography Hyperpolarized helium magnetic resonance lmaging Ventilation distribution Functional lung imaging |
url |
http://www.biomedical-engineering-online.com/content/11/1/68 |
work_keys_str_mv |
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