scholarly journals Free‐running 3D whole heart myocardial T 1 mapping with isotropic spatial resolution

2019 ◽  
Vol 82 (4) ◽  
pp. 1331-1342 ◽  
Author(s):  
Haikun Qi ◽  
Olivier Jaubert ◽  
Aurelien Bustin ◽  
Gastao Cruz ◽  
Huijun Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Isotropic Spatial Resolution ◽  
Free Running ◽  
Whole Heart

Free-running simultaneous myocardial T1/T2 mapping and cine imaging with 3D whole-heart coverage and isotropic spatial resolution

2019 ◽  
Vol 63 ◽  
pp. 159-169 ◽  
Author(s):  
Haikun Qi ◽  
Aurelien Bustin ◽  
Gastao Cruz ◽  
Olivier Jaubert ◽  
Huijun Chen ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
T2 Mapping ◽  
Cine Imaging ◽  
Isotropic Spatial Resolution ◽  
Myocardial T1 ◽  
Free Running ◽  
Whole Heart

scholarly journals Clinical application of free-breathing 3D whole heart late gadolinium enhancement cardiovascular magnetic resonance with high isotropic spatial resolution using Compressed SENSE

2020 ◽  
Vol 22 (1) ◽  
Author(s):  
Lenhard Pennig ◽  
Simon Lennartz ◽  
Anton Wagner ◽  
Marcel Sokolowski ◽  
Matej Gajzler ◽  
...  
Keyword(s):  
Heart Rate ◽  
Cardiovascular Magnetic Resonance ◽  
Late Gadolinium Enhancement ◽  
Spatial Resolution ◽  
Free Breathing ◽  
Breath Hold ◽  
Gadolinium Enhancement ◽  
Isotropic Spatial Resolution ◽  
Scan Time ◽  
Whole Heart

Abstract Background Late gadolinium enhancement (LGE) cardiovascular magnetic resonance (CMR) represents the gold standard for assessment of myocardial viability. The purpose of this study was to investigate the clinical potential of Compressed SENSE (factor 5) accelerated free-breathing three-dimensional (3D) whole heart LGE with high isotropic spatial resolution (1.4 mm3 acquired voxel size) compared to standard breath-hold LGE imaging. Methods This was a retrospective, single-center study of 70 consecutive patients (45.8 ± 18.1 years, 27 females; February–November 2019), who were referred for assessment of left ventricular myocardial viability and received free-breathing and breath-hold LGE sequences at 1.5 T in clinical routine. Two radiologists independently evaluated global and segmental LGE in terms of localization and transmural extent. Readers scored scans regarding image quality (IQ), artifacts, and diagnostic confidence (DC) using 5-point scales (1 non-diagnostic—5 excellent/none). Effects of heart rate and body mass index (BMI) on IQ, artifacts, and DC were evaluated with ordinal logistic regression analysis. Results Global LGE (n = 33) was identical for both techniques. Using free-breathing LGE (average scan time: 04:33 ± 01:17 min), readers detected more hyperenhanced lesions (28.2% vs. 23.5%, P < .05) compared to breath-hold LGE (05:15 ± 01:23 min, P = .0104), pronounced at subepicardial localization and for 1–50% of transmural extent. For free-breathing LGE, readers graded scans with good/excellent IQ in 80.0%, with low-impact/no artifacts in 78.6%, and with good/high DC in 82.1% of cases. Elevated BMI was associated with increased artifacts (P = .0012) and decreased IQ (P = .0237). Increased heart rate negatively influenced artifacts (P = .0013) and DC (P = .0479) whereas IQ (P = .3025) was unimpaired. Conclusions In a clinical setting, free-breathing Compressed SENSE accelerated 3D high isotropic spatial resolution whole heart LGE provides good to excellent image quality in 80% of scans independent of heart rate while enabling improved depiction of small and particularly non-ischemic hyperenhanced lesions in a shorter scan time than standard breath-hold LGE.

Fault Localization and Functional Testing of ICs by Lock-in Thermography

2002 ◽  
Author(s):  
O. Breitenstein ◽  
J.P. Rakotoniaina ◽  
F. Altmann ◽  
J. Schulz ◽  
G. Linse
Keyword(s):  
Spatial Resolution ◽  
Electronic Device ◽  
Imaging Techniques ◽  
Heat Diffusion ◽  
Acquisition Time ◽  
Temperature Modulation ◽  
Heat Sources ◽  
Ir Camera ◽  
Free Running ◽  
Lock In

Abstract In this paper new thermographic techniques with significant improved temperature and/or spatial resolution are presented and compared with existing techniques. In infrared (IR) lock-in thermography heat sources in an electronic device are periodically activated electrically, and the surface is imaged by a free-running IR camera. By computer processing and averaging the images over a certain acquisition time, a surface temperature modulation below 100 µK can be resolved. Moreover, the effective spatial resolution is considerably improved compared to stead-state thermal imaging techniques, since the lateral heat diffusion is suppressed in this a.c. technique. However, a serious limitation is that the spatial resolution is limited to about 5 microns due to the IR wavelength range of 3 -5 µm used by the IR camera. Nevertheless, we demonstrate that lock-in thermography reliably allows the detection of defects in ICs if their power exceeds some 10 µW. The imaging can be performed also through the silicon substrate from the backside of the chip. Also the well-known fluorescent microthermal imaging (FMI) technique can be be used in lock-in mode, leading to a temperature resolution in the mK range, but a spatial resolution below 1 micron.

Slit-enabled linear-array photoacoustic tomography with near isotropic spatial resolution in three dimensions

2017 ◽  
Author(s):  
Yuehang Wang ◽  
Depeng Wang ◽  
Yumiao Zhang ◽  
Jumin Geng ◽  
Ryan Hubbell ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Linear Array ◽  
Three Dimensions ◽  
Photoacoustic Tomography ◽  
Isotropic Spatial Resolution

scholarly journals Natively fat‐suppressed 5D whole‐heart MRI with a radial free‐running fast‐interrupted steady‐state (FISS) sequence at 1.5T and 3T

2019 ◽  
Vol 83 (1) ◽  
pp. 45-55 ◽  
Author(s):  
Jessica A.M. Bastiaansen ◽  
Davide Piccini ◽  
Lorenzo Di Sopra ◽  
Christopher W. Roy ◽  
John Heerfordt ◽  
...  
Keyword(s):  
Steady State ◽  
Free Running ◽  
Whole Heart
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