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Coronary MRI with a Respiratory Feedback Monitor: The 2D Imaging Case
Author(s) -
Wang Yi,
Christy Paul S.,
Korosec Frank R.,
Alley Marcus T.,
Grist Thomas M.,
Polzin Jason A.,
Mistretta Charles A.
Publication year - 1995
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910330118
Subject(s) - medicine , respiratory monitoring , bellows , respiratory system , position (finance) , circumference , radiology , cardiology , nuclear medicine , mathematics , mechanical engineering , geometry , finance , engineering , economics
The inability to return the heart to the same position for all breath‐holds during 2D coronary MR imaging can result in imaging different locations than desired. This can lead to problems such as (i) missing a whole vessel, or a part of it, (ii) misaligning segments of vessels imaged in different breath‐holds, and (iii) degrading image quality when a single slice is acquired in multiple breath‐holds. To reduce inconsistencies in the breath‐hold level, we designed a respiratory feedback monitor (RFM) that uses a bellows to monitor the circumference of the subject's chest. When the circumference of the subject's chest is within preset limits, an audio signal alerts subjects to hold their breath at that position. Use of the RFM significantly reduces the problems caused by inconsistent breath‐holds and the number of breath‐holds for an examination in 2D coronary MR imaging.