Healthy Volunteers
Conditions
Keywords
Magnetic Resonance Imaging, Pulmonary Function
Brief summary
Healthy volunteers aged 18-75 will undergo hyperpolarized 3-Helium MRI and pulmonary function testing for the development of tools to assess image signal to noise and reproducibility of spin-density and diffusion-weighted imaging.
Detailed description
During a two hour visit, subjects will provide written informed consent and then undergo: 1) brief medical history and vital signs, 2) full pulmonary function tests, 3) proton MRI, 4) spin-density and/or diffusion weighted 3He MRI. Full pulmonary function tests including spirometry, plethysmography and diffusing capacity of carbon monoxide (DLCO), Lung Clearance Index (LCI) and Airwave Oscillometry (AO) will be performed according to ATS guidelines. MedGraphics Elite Series, MedGraphics Corporation. St. Paul, MN USA and/or nDD EasyOne Spirometer, nDD Medical Technologies Inc. Andover, MA USA will be used. All measurements will be performed in the Pulmonary Function Laboratory at Robarts Research Institute. Subjects will be placed in the 3T MR scanner with the 3He chest coil fitted over their torso and chest. Hearing protection will be provided to each subject to muffle the noise produced by the gradient RF coils. A pulse oximeter lead will be attached to all of the subjects to monitor their heart rate and oxygen saturation. MRI will be performed for up to a period of 30 minutes. All subjects will have supplemental oxygen available via nasal cannula at a flow-rate of 2 liters per minute as a precaution in the event of oxygen desaturation.
Interventions
DIAGNOSTIC_TESTHyperpolarized Helium 3 Magnetic Resonance Imaging
Hyperpolarized noble gas imaging using Helium-3 has been used to explore structural and functional relationships in the lung in patients with lung disease and healthy controls. In contrast to proton-based MRI imaging, 3He gas is used as a contrast agent to directly visualize the airways, and thus ventilation. Whereas the normal density of gas is too low to produce an easily detectable signal, this is overcome by artificially increasing the amount of polarization per unit volume using optical pumping.
Sponsors
London Health Sciences Centre
Western University, Canada
Study design
Observational model
COHORT
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
* Able to perform a breath hold for up to 16 seconds. * BMI between 18 and 40. * Stable health on the basis of medical history. * Smoking history \< 1 pack/year.
Exclusion criteria
* Patient is, in the opinion of the investigator, mentally or legally incapacitated, preventing informed consent from being obtained, or cannot read or understand the written material. * Subject has a daytime room air oxygen saturation \<90% while lying supine. * Patient is unable to perform spirometry or plethysmography maneuvers * Patient is pregnant * In the investigator's opinion, subject suffers from any physical, psychological or other condition(s) that might prevent performance of the MRI, such as severe claustrophobia. * Subject has an implanted mechanically, electrically or magnetically activated device or any metal in their body which cannot be removed, including but not limited to pacemakers, neurostimulators, biostimulators, implanted insulin pumps, aneurysm clips, bioprosthesis, artificial limb, metallic fragment or foreign body, shunt, surgical staples (including clips or metallic sutures and/or ear implants.)
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Ventilation Defect Percent (VDP) | 5 years | VDP is a widely used noble gas MRI biomarkers that is calculated by normalizing ventilation defect volume to the thoracic cavity. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Apparent Diffusion Coefficients (ADC) | 5 years | Diffusion weighted noble gas MRI provides a way to quantify pulmonary microstructure by sensing the movements of inhaled gas atoms. The apparent dif fusion coefficient (ADC) during the diffusion time interval can be used to reflect the extent of alveolar restriction of gas atom movements, providing a surrogate measurement of airspace dimensions. |
Countries
Canada
Outcome results
None listed