scholarly journals Nonlinear myocardial signal intensity correction improves quantification of contrast-enhanced first-pass MR perfusion in humans

2008 ◽  
Vol 27 (4) ◽  
pp. 793-801 ◽  
Author(s):  
Li-Yueh Hsu ◽  
Peter Kellman ◽  
Andrew E Arai
Keyword(s):  
Signal Intensity ◽  
Mr Perfusion ◽  
Myocardial Signal ◽  
Contrast Enhanced ◽  
First Pass ◽  
Myocardial Signal Intensity

Correlation between dose rate and T1 in blood at gd-enhanced MR angiography

1998 ◽  
Vol 39 (5) ◽  
pp. 579-582 ◽  
Author(s):  
L. O. M. Johansson ◽  
H. K. Ahlström
Keyword(s):  
Time Delay ◽  
Contrast Agent ◽  
Dose Rate ◽  
Abdominal Aorta ◽  
Signal Intensity ◽  
Mr Angiography ◽  
Pulse Sequence ◽  
Test Dose ◽  
Contrast Enhanced ◽  
First Pass

Purpose: to determine the correlation between dose rate and T1 in blood at Gd-enhanced MR angiography (MRA) Material and Methods: A test dose of contrast agent was used to calculate the time delay between injection and arrival in the abdominal aorta. the dose rate was expressed as ml · kg b.w.−1 · s−1. the correlation between dose rate and T1 was determined by varying the dose rate while keeping the scanning and infusion times constant. the signal intensity in the abdominal aorta was measured during the first pass of Gd and compared with markers of known T1 values Results: A correlation between dose rate and T1 in blood was obtained Conclusion: A Gd dose rate of 0.01 ml · kg b.w.−1 · s−1 gives a T1 in blood of 100 ms. This can be used to calculate the optimal pulse sequence for contrast-enhanced MRA

Myocardial signal intensity decay after gadolinium injection: a fast and effective method for the diagnosis of cardiac amyloidosis

2014 ◽  
Vol 30 (6) ◽  
pp. 1105-1115 ◽  
Author(s):  
Giovanni Donato Aquaro ◽  
Nicola Riccardo Pugliese ◽  
Federico Perfetto ◽  
Francesco Cappelli ◽  
Andrea Barison ◽  
...  
Keyword(s):  
Signal Intensity ◽  
Cardiac Amyloidosis ◽  
Gadolinium Injection ◽  
Myocardial Signal ◽  
Intensity Decay ◽  
Myocardial Signal Intensity

scholarly journals Influence of longitudinal position on the evolution of steady-state signal in cardiac cine balanced steady-state free precession imaging

2017 ◽  
Vol 6 (11) ◽  
pp. 205846011772918
Author(s):  
Tyler J Spear ◽  
Tori A Stromp ◽  
Steve W Leung ◽  
Moriel H Vandsburger
Keyword(s):  
Steady State ◽  
Signal Intensity ◽  
Steady State Free Precession ◽  
Three Dimensional ◽  
Free Precession ◽  
Myocardial Signal ◽  
Cardiac Cine ◽  
Longitudinal Position ◽  
Myocardial Signal Intensity ◽  
Slice Location

Background Emerging quantitative cardiac magnetic resonance imaging (CMRI) techniques use cine balanced steady-state free precession (bSSFP) to measure myocardial signal intensity and probe underlying physiological parameters. This correlation assumes that steady-state is maintained uniformly throughout the heart in space and time. Purpose To determine the effects of longitudinal cardiac motion and initial slice position on signal deviation in cine bSSFP imaging by comparing two-dimensional (2D) and three-dimensional (3D) acquisitions. Material and Methods Nine healthy volunteers completed cardiac MRI on a 1.5-T scanner. Short axis images were taken at six slice locations using both 2D and 3D cine bSSFP. 3D acquisitions spanned two slices above and below selected slice locations. Changes in myocardial signal intensity were measured across the cardiac cycle and compared to longitudinal shortening. Results For 2D cine bSSFP, 46% ± 9% of all frames and 84% ± 13% of end-diastolic frames remained within 10% of initial signal intensity. For 3D cine bSSFP the proportions increased to 87% ± 8% and 97% ± 5%. There was no correlation between longitudinal shortening and peak changes in myocardial signal. The initial slice position significantly impacted peak changes in signal intensity for 2D sequences ( P < 0.001). Conclusion The initial longitudinal slice location significantly impacts the magnitude of deviation from steady-state in 2D cine bSSFP that is only restored at the center of a 3D excitation volume. During diastole, a transient steady-state is established similar to that achieved with 3D cine bSSFP regardless of slice location.

Cyclic variation of myocardial signal intensity in real-time myocardial perfusion imaging

2002 ◽  
Vol 15 (12) ◽  
pp. 1425-1431 ◽  
Author(s):  
Raffi Bekeredjian ◽  
Alexander Hansen ◽  
Arthur Filusch ◽  
Alain-Eric Dubart ◽  
Kleber Gaspar Carvallho da Silva ◽  
...  
Keyword(s):  
Myocardial Perfusion Imaging ◽  
Myocardial Perfusion ◽  
Real Time ◽  
Perfusion Imaging ◽  
Signal Intensity ◽  
Cyclic Variation ◽  
Myocardial Signal ◽  
Myocardial Signal Intensity

Clinical feasibility of a myocardial signal intensity threshold-based semi-automated cardiac magnetic resonance segmentation method

2015 ◽  
Vol 26 (5) ◽  
pp. 1503-1511 ◽  
Author(s):  
Akos Varga-Szemes ◽  
Giuseppe Muscogiuri ◽  
U. Joseph Schoepf ◽  
Julian L. Wichmann ◽  
Pal Suranyi ◽  
...  
Keyword(s):  
Cardiac Magnetic Resonance ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
Segmentation Method ◽  
Intensity Threshold ◽  
Myocardial Signal ◽  
Signal Intensity Threshold ◽  
Myocardial Signal Intensity

Influence of respiration on myocardial signal intensity

2001 ◽  
Vol 27 (4) ◽  
pp. 473-479 ◽  
Author(s):  
Birgitta Janerot-Sjöberg ◽  
Niklas von Schmalensee ◽  
Anja Schreckenberger ◽  
Arina Richter ◽  
Einar Brandt ◽  
...  
Keyword(s):  
Signal Intensity ◽  
Myocardial Signal ◽  
Myocardial Signal Intensity
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