scholarly journals Improved preclinical hyperpolarized 129 Xe ventilation imaging with constant flip angle 3D radial golden means acquisition and keyhole reconstruction

2020 ◽  
Author(s):  
Peter J. Niedbalski ◽  
Zackary I. Cleveland
Keyword(s):  
Flip Angle ◽  
Ventilation Imaging

scholarly journals Reproducibility of 19 F‐MR ventilation imaging in healthy volunteers

2021 ◽  
Vol 85 (6) ◽  
pp. 3343-3352
Author(s):  
Benjamin J. Pippard ◽  
Mary A. Neal ◽  
Adam M. Maunder ◽  
Kieren G. Hollingsworth ◽  
Alberto Biancardi ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Ventilation Imaging

Accuracy of equilibrium magnetization mapping in sliced two-dimensional spoiled gradient-recalled echo pulse sequence with variable flip angle

2013 ◽  
Vol 38 (5) ◽  
pp. 1245-1250
Author(s):  
Hideto Kuribayashi ◽  
Masaki Sekino ◽  
Takuya Minowa ◽  
Yoshie Maitani ◽  
Hiroyuki Ohsaki ◽  
...  
Keyword(s):  
Pulse Sequence ◽  
Flip Angle ◽  
Two Dimensional ◽  
Variable Flip Angle ◽  
Equilibrium Magnetization ◽  
Echo Pulse

Partial flip-angle spin-echo imaging: clinical applications

1989 ◽  
Vol 153 (4) ◽  
pp. 883-884
Author(s):  
JP Laissy ◽  
P Hugonet
Keyword(s):  
Spin Echo ◽  
Clinical Applications ◽  
Flip Angle

A dual flip angle 3D bSSFP magnetization transfer-like method to differentiate between recent and old myocardial infarction

2018 ◽  
Vol 47 (3) ◽  
pp. spcone-spcone
Author(s):  
Philippe Germain ◽  
Soraya El Ghannudi ◽  
Aissam Labani ◽  
Mi Y. Jeung ◽  
Afshin Gangi ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Magnetization Transfer ◽  
Flip Angle ◽  
Old Myocardial Infarction

MRI of the coronary arteries: flip angle train optimization for 3D sequences

2002 ◽  
Vol 12 (3) ◽  
pp. 177-181
Author(s):  
Volker Hietschold ◽  
Nasreddin Abolmaali ◽  
Thomas Kittner
Keyword(s):  
Coronary Arteries ◽  
Flip Angle ◽  
3D Sequences

scholarly journals Improvement in B1+ Homogeneity and Average Flip Angle Using Dual-Source Parallel RF Excitation for Cardiac MRI in Swine Hearts

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0139859 ◽  
Author(s):  
Michael Schär ◽  
Haiyan Ding ◽  
Daniel A. Herzka
Keyword(s):  
Cardiac Mri ◽  
Flip Angle ◽  
Dual Source ◽  
Rf Excitation

MR imaging in Moyamoya disease: utility of partial flip angle T2- weighted spin-echo imaging

1991 ◽  
Vol 27 (4) ◽  
pp. 479
Author(s):  
Kee Hyun Chang ◽  
Moon Hee Han ◽  
Jeong Geun Yi ◽  
In One Kim ◽  
Man Chung Han
Keyword(s):  
Mr Imaging ◽  
Moyamoya Disease ◽  
Spin Echo ◽  
Flip Angle

scholarly journals The spatial pattern of methacholine bronchoconstriction recurs when supine independently of posture during provocation but does not recur between postures

2018 ◽  
Vol 125 (6) ◽  
pp. 1720-1730 ◽  
Author(s):  
Eric T. Geier ◽  
Kent Kubo ◽  
Rebecca J. Theilmann ◽  
Gordon K. Prisk ◽  
Rui C. Sá
Keyword(s):  
Spatial Pattern ◽  
Spatial Patterns ◽  
Odds Ratio ◽  
Dependent Lung ◽  
Lung Inflation ◽  
Imaging Condition ◽  
Prone Imaging ◽  
Ventilation Imaging ◽  
Supine Posture ◽  
Gravitational Influence

The location of lung regions with compromised ventilation (often called ventilation defects) during a bronchoconstriction event may be influenced by posture. We aimed to determine the effect of prone versus supine posture on the spatial pattern of methacholine-induced bronchoconstriction in six healthy adults (ages 21–41, 3 women) using specific ventilation imaging. Three postural conditions were chosen to assign the effect of posture to the drug administration and/or imaging phase of the experiment: supine methacholine administration followed by supine imaging, prone methacholine administration followed by supine imaging, and prone methacholine administration followed by prone imaging. The two conditions in which imaging was performed supine had similar spatial patterns of bronchoconstriction despite a change in posture during methacholine administration; the odds ratio for recurrent constriction was mean (SD) = 7.4 (3.9). Conversely, dissimilar spatial patterns of bronchoconstriction emerged when posture during imaging was changed; the odds ratio for recurrent constriction between the prone methacholine/supine imaging condition and the prone methacholine/prone imaging condition was 1.2 (0.9). Logistic regression showed that height above the dependent lung border was a significant negative predictor of constriction in the two supine imaging conditions ( P < 0.001 for each) but not in the prone imaging condition ( P = 0.20). These results show that the spatial pattern of methacholine bronchoconstriction is recurrent in the supine posture, regardless of whether methacholine is given prone or supine but that prone posture during imaging eliminates that recurrent pattern and reduces its dependence on gravitational height. NEW & NOTEWORTHY The spatial pattern of methacholine bronchoconstriction in the supine posture is recurrent and skewed toward the dependent lung, regardless of whether inhaled methacholine is administered while supine or while prone. However, both the recurrent pattern and the gravitational skew are eliminated if imaging is performed prone. These results suggest that gravitational influence on regional lung inflation and airway topography at the time of measurement play a role in determining regional bronchoconstriction in the healthy lung.

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