Motion compensated projection reconstruction

Schäffter, Tobias; Rasche, Volker; Carlsen, Ingwer C.

doi:10.1002/(sici)1522-2594(199905)41:5<954::aid-mrm15>3.0.co;2-j

Cited by 61 publications

(35 citation statements)

References 17 publications

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“…Optical tracking [14] and respiratory bellows [10] require long set-up times and careful calibration. For these reasons, self-navigating techniques [15], [16] are preferred in 3D cardiac CINE that can directly estimate the respiratory-induced cardiac motion from the acquired data itself.…”

Section: Introductionmentioning

confidence: 99%

Free breathing whole-heart 3D CINE MRI with self-gated Cartesian trajectory

Usman

Ruijsink

Nazir

et al. 2017

Magnetic Resonance Imaging

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PurposeTo present a method that uses a novel free-running self-gated acquisition to achieve isotropic resolution in whole heart 3D Cartesian cardiac CINE MRI.Material and methods3D cardiac CINE MRI using navigator gating results in long acquisition times. Recently, several frameworks based on self-gated non-Cartesian trajectories have been proposed to accelerate this acquisition. However, non-Cartesian reconstructions are computationally expensive due to gridding, particularly in 3D. In this work, we propose a novel highly efficient self-gated Cartesian approach for 3D cardiac CINE MRI. Acquisition is performed using CArtesian trajectory with Spiral PRofile ordering and Tiny golden angle step for eddy current reduction (so called here CASPR-Tiger). Data is acquired continuously under free breathing (retrospective ECG gating, no preparation pulses interruption) for 4–5 min and 4D whole-heart volumes (3D + cardiac phases) with isotropic spatial resolution are reconstructed from all available data using a soft gating technique combined with temporal total variation (TV) constrained iterative SENSE reconstruction.ResultsFor data acquired on eight healthy subjects and three patients, the reconstructed images using the proposed method had good contrast and spatio-temporal variations, correctly recovering diastolic and systolic cardiac phases. Non-significant differences (P > 0.05) were observed in cardiac functional measurements obtained with proposed 3D approach and gold standard 2D multi-slice breath-hold acquisition.ConclusionThe proposed approach enables isotropic 3D whole heart Cartesian cardiac CINE MRI in 4 to 5 min free breathing acquisition.

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Section: Introductionmentioning

confidence: 99%

Free breathing whole-heart 3D CINE MRI with self-gated Cartesian trajectory

Usman

Ruijsink

Nazir

et al. 2017

Magnetic Resonance Imaging

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“…In the presented approach, the latter problem is reduced due to the very short time delay between the scans. Nevertheless, if higher spatial resolution is required, free-breathing techniques using navigators [25] or self-navigation approaches [26,27] seem to hold higher potential.…”

Section: Discussionmentioning

confidence: 99%

Dual-contrast single breath-hold 3D abdominal MR imaging

Winkelmann

Börnert

Becker

et al. 2006

Magn Reson Mater Phy

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“…The quality of temperature control in rabbit thigh remained satisfying throughout the complete experiment, despite rigid body motion and missing data due to transfer errors. No motion‐correction algorithms were applied during the hyperthermic procedure, but a number of solutions have already been proposed to correct temperature maps in which MR image phases also vary with temperature (24–27). Moreover, artifacts due to hardware limitations should disappear with increasing computer and network performance.…”

Section: Discussionmentioning

confidence: 99%

Automatic control of hyperthermic therapy based on real‐time Fourier analysis of MR temperature maps

Quesson

Vimeux

Salomir

et al. 2002

Magnetic Resonance in Med

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Local hyperthermia is increasingly being used for therapeutic purposes, such as tumor ablation. Heat conduction and energy absorption in vivo during the hyperthermic procedure are largely unknown, thus making feedback temperature control highly desirable. Here, a general method for temperature control based on Fourier transformation (FT) of the bio-heat equation is presented, taking into account heat diffusion ( Within the full spectrum of electromagnetic and sound waves, only focused ultrasound (FUS) can be used to generate local hyperthermia noninvasively (1). The local temperature increase may serve a wide variety of medical interventions, such as ablation of tumoral tissue (2,3) or cardiac tissue to treat arrhythmias (4). In addition, local hyperthermia has been suggested for local drug delivery (5-7) with thermosensitive microcarriers (1), control of gene therapy using heat-sensitive promoters (8), and heatactivated chemotherapy or local contrast agent deposition (9,10). Temperature evolution during hyperthermic treatment is a function of heat deposition and heat diffusion. Heat deposition by FUS depends on the local absorption of ultrasound energy and its transition to molecular (atomic) vibration energy. Pure water and blood hardly absorb ultrasound energy. The absorption of ultrasound depends on tissue composition and the ultrasound wavelength. Therefore, accurate quantification of energy deposition by FUS and absorption by tissue is difficult to predict. Heat conduction also depends on tissue composition. Diffusion and perfusion processes may vary locally as a function of tissue architecture and tissue composition. Physiological events such as temperature-dependent perfusion increases may play a role. In case of ablation procedures, tissue coagulation may significantly modify heat conduction as well as energy absorption. As a consequence, heat losses and energy absorption are difficult to predict in advance of the procedure.Optimal control of the temperature-based treatment requires regulation of the temperature. Recent developments have shown that rapid MRI, followed by on-line data processing and real-time feedback to the FUS output, and combined with new temperature regulation algorithms, may provide such control. Salomir et al. (11) described regulation of temperature evolution of the focal point based on temperature mapping and a physical model of local energy deposition and heat conduction. An essential element was the real-time evaluation of temperature gradients near the focal point. This was achieved by on-line calculation of the Laplacian value from the temperature maps. The method performed well under conditions of FUS energy deposit in a small, well defined region. Recently, it was shown that the use of either multiple FUS focal points (using a phased-array FUS transducer (12,13)) or a spatial trajectory of a single focal point (mechanical displacement (14)) may lead to shorter treatment times. However, heat diffusion estimated from the Laplacian value of temperature is ill defined in such ...

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Motion compensated projection reconstruction

Cited by 61 publications

References 17 publications

Free breathing whole-heart 3D CINE MRI with self-gated Cartesian trajectory

Free breathing whole-heart 3D CINE MRI with self-gated Cartesian trajectory

Dual-contrast single breath-hold 3D abdominal MR imaging

Automatic control of hyperthermic therapy based on real‐time Fourier analysis of MR temperature maps

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