Influence of oxygen flow rate on signal and T1 changes in oxygen-enhanced ventilation imaging

✍ Scribed by Vu M. Mai; Benjamin Liu; Wei Li; Jason Polzin; Saban Kurucay; Qun Chen; Robert R. Edelman

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 634 KB
• Volume: 16
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.10131

✦ Synopsis

Purpose:

To investigate the optimal oxygen flow rate for oxygen-enhanced mr ventilation imaging.

Materials and methods:

Using a cardiac-triggered nonselective inversion recovery (ir) half fourier single-shot fast spin echo sequence, series of images were acquired with the subject alternately inhaling room air and 100% oxygen. oxygen flow rates of 5 l/min, 10 l/min, 15 l/min, 20 l/min, and 25 l/min were studied, and signal intensity from the oxygen-enhanced ventilation images and t(1) of the lung were measured.

Results:

The average signal intensity was 63.0 +/- 21.0 for 5 l/min, 98.7 +/- 26.8 for 10 l/min, 133.8 +/- 20.0 for 15 l/min, 138.7 +/- 19.7 for 20 l/min, and 139.2 +/- 37.9 for 25 l/min. the average t(1)'s of the lung were 1399 msec +/- 130 msec for room air, 1314 msec +/- 101 msec for 5 l/min, 1276 msec +/- 105 msec for 10 l/min, 1207 msec +/- 71 msec for 15 l/min, 1206 msec +/- 90 msec for 20 l/min, and 1207 msec +/- 42 msec for 25 l/min.

Conclusion:

The optimal flow rate is 15 l/min for oxygen-enhanced ventilation imaging.