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Inclusion Criteria:

* Subjects male and female aged 18-60 with a clinical diagnosis of asthma
* Smoking history ≤ 1 pack/year
* Subject understands the study procedures and is willing to participate in the study as indicated by signature on the informed consent
* Subject is judged to be in otherwise stable health on the basis of medical history
* Subject able to perform reproducible pulmonary function testing (i.e., the 3 best acceptable spirograms have FEV1 values that do not vary more than 5% of the largest value or more than 100 ml, whichever is greater.)
* FEV1 \>60% predicted

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
* Patient is unable to perform spirometry or plethysmography maneuvers
* 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.) (At the discretion of the MRI Technologist/3T Manager)
* 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.
* Patient is pregnant

• London, Ontario, Canada