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Use of respiratory biofeedback and CLAWS for increased navigator efficiency for imaging the thoracic aorta

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Jhooti Permi, Haas Tanja, Kawel Nadine, Bremerich Jens, Keegan Jenny, Scheffler Klaus,
Project The Use of Biofeedback For a Human-Centred Approach to Improving Cardiovascular Magnetic Resonance Imaging
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Original article (peer-reviewed)

Journal Magnetic Resonance in Medicine
Volume (Issue) 66(6)
Page(s) 1666 - 1673
Title of proceedings Magnetic Resonance in Medicine


A novel technique to guide a subjects’ breathing pattern using a respiratory biofeedback (rBF) ‘‘game’ to improve respiratory efficiency is presented. The continuously adaptive windowing strategy, a fully automatic and highly efficient free-breathing navigator gated technique, is used to acquire the data as it ensures that all potential navigator acceptance windows are possible. This enables the rBF to be fully adaptable to a sub- ject’s respiratory pattern. Images of the thoracic aorta acquired using balanced steady-state free precession with continuously adaptive windowing strategy respiratory motion control, with and without rBF, were compared in 10 healthy subjects. Total scan time was reduced by using rBF. The mean scan time was reduced from 7 min 44 s (463 cardiac cycles, 6127cc) without rBF to 5 min 43 s (380 cardiac cycles, 6118cc) with the use of rBF (P < 0.05). Respiratory efficiency was increased from 45% without rBF to 56% with rBF (P < 0.01). Image quality was the same for both techniques (P 5 ns). In conclusion, rBF significantly improved respiratory effi- ciency and reduced acquisition duration without affecting image quality.