MR studies in which a paramagnetic gas is administered to a living patient
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United States of America Patent
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Dec 9, 1997
Grant Date -
N/A
app pub date -
Apr 17, 1996
filing date -
Apr 17, 1996
priority date (Note) -
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Abstract
A paramagnetic gas such as oxygen is administered twice at different concentrations to a living patient, as by causing the patient to breathe air and causing the patient to breathe pure oxygen. Two T1-weighted MR images are then acquired of a region in which the gas is present; advantageously, the region includes the patient's lungs. Because the paramagnetic gas shortens the T1 relaxation time of e.g. the patient's lung tissue, a comparison of the T1-weighted MR images shows where the gas has reached the patient's lung tissue and where the gas has been prevented from reaching the patient's lung tissue. This permits the radiologist to carry out e.g. a ventilation study without administering a radioactive material to the patient.
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