The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Sébastien Roujol - One of the best experts on this subject based on the ideXlab platform.
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Towards Optimized MR Thermometry of the Human Heart at 3T
NMR in Biomedicine, 2012Co-Authors: Silke Hey, Alexandru Cernicanu, Baudouin Denis De Senneville, Sébastien Roujol, Mario Ries, Pierre Jais, Chrit Moonen, Bruno QuessonAbstract:Catheter ablation using radio-frequency (RF) has been used increasingly for the treatment of cardiac arrhythmias. Proton resonance frequency shift (PRFS) based MR Thermometry may provide intra-procedural feedback on the temperature distribution, helping with the determination of the therapy endpoint. As a step towards PRFS-based cardiac Thermometry at 3T, we evaluated the suitability of two different MR Thermometry sequences (TFE and TFE-EPI) and three blood suppression techniques using as a criterion the highest signal-to-noise (SNR) and contrast-to-noise ratios (CNR), as well as the lowest temporal temperature standard deviation (corresponding to the highest temperature stability) and lowest temporal average of temperature in the myocardium. Experiments were performed without heating, using an optimized imaging protocol including navigator respiratory compensation, cardiac triggering, and image processing for the compensation of motion and susceptibility artifacts. The effectiveness of blood suppression and its effect on temperature stability was evaluated in the ventricular septum of 8 healthy volunteers using multi-slice double inversion recovery (MDIR), motion-sensitized driven equilibrium (MSDE), and inflow saturation by saturation slabs (IS) over a period of 50 seconds of free breathing. It was shown that blood suppression during MR Thermometry improves the CNR and the robustness of the applied motion correction algorithm. This was confirmed in the temperature stability. Furthermore, a gradient echo sequence with EPI readout acceleration and parallel imaging (SENSE) in combination with inflow saturation blood suppression was shown to achieve the best results. A temperature stability of 2°C or better in the ventricular septum, with a spatial resolution of 3.5 x 3.5 x 8 mm3, and a temporal resolution corresponding to the heart rate of the volunteer were observed. Our results indicate that blood suppression is necessary and improves the temperature stability when performing cardiac MR Thermometry. The proposed MR Thermometry protocol, which optimizes temperature stability in the ventricular
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real time mr Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Bruno Quesson, M Ries, Chrit T W Moonen, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift-based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2 degrees C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
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Real-time MR-Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Mario Ries, Chrit Moonen, Bruno Quesson, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift–based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2°C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
Bruno Quesson - One of the best experts on this subject based on the ideXlab platform.
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Towards Optimized MR Thermometry of the Human Heart at 3T
NMR in Biomedicine, 2012Co-Authors: Silke Hey, Alexandru Cernicanu, Baudouin Denis De Senneville, Sébastien Roujol, Mario Ries, Pierre Jais, Chrit Moonen, Bruno QuessonAbstract:Catheter ablation using radio-frequency (RF) has been used increasingly for the treatment of cardiac arrhythmias. Proton resonance frequency shift (PRFS) based MR Thermometry may provide intra-procedural feedback on the temperature distribution, helping with the determination of the therapy endpoint. As a step towards PRFS-based cardiac Thermometry at 3T, we evaluated the suitability of two different MR Thermometry sequences (TFE and TFE-EPI) and three blood suppression techniques using as a criterion the highest signal-to-noise (SNR) and contrast-to-noise ratios (CNR), as well as the lowest temporal temperature standard deviation (corresponding to the highest temperature stability) and lowest temporal average of temperature in the myocardium. Experiments were performed without heating, using an optimized imaging protocol including navigator respiratory compensation, cardiac triggering, and image processing for the compensation of motion and susceptibility artifacts. The effectiveness of blood suppression and its effect on temperature stability was evaluated in the ventricular septum of 8 healthy volunteers using multi-slice double inversion recovery (MDIR), motion-sensitized driven equilibrium (MSDE), and inflow saturation by saturation slabs (IS) over a period of 50 seconds of free breathing. It was shown that blood suppression during MR Thermometry improves the CNR and the robustness of the applied motion correction algorithm. This was confirmed in the temperature stability. Furthermore, a gradient echo sequence with EPI readout acceleration and parallel imaging (SENSE) in combination with inflow saturation blood suppression was shown to achieve the best results. A temperature stability of 2°C or better in the ventricular septum, with a spatial resolution of 3.5 x 3.5 x 8 mm3, and a temporal resolution corresponding to the heart rate of the volunteer were observed. Our results indicate that blood suppression is necessary and improves the temperature stability when performing cardiac MR Thermometry. The proposed MR Thermometry protocol, which optimizes temperature stability in the ventricular
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real time mr Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Bruno Quesson, M Ries, Chrit T W Moonen, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift-based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2 degrees C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
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Real-time MR-Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Mario Ries, Chrit Moonen, Bruno Quesson, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift–based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2°C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
Baudouin Denis De Senneville - One of the best experts on this subject based on the ideXlab platform.
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Towards Optimized MR Thermometry of the Human Heart at 3T
NMR in Biomedicine, 2012Co-Authors: Silke Hey, Alexandru Cernicanu, Baudouin Denis De Senneville, Sébastien Roujol, Mario Ries, Pierre Jais, Chrit Moonen, Bruno QuessonAbstract:Catheter ablation using radio-frequency (RF) has been used increasingly for the treatment of cardiac arrhythmias. Proton resonance frequency shift (PRFS) based MR Thermometry may provide intra-procedural feedback on the temperature distribution, helping with the determination of the therapy endpoint. As a step towards PRFS-based cardiac Thermometry at 3T, we evaluated the suitability of two different MR Thermometry sequences (TFE and TFE-EPI) and three blood suppression techniques using as a criterion the highest signal-to-noise (SNR) and contrast-to-noise ratios (CNR), as well as the lowest temporal temperature standard deviation (corresponding to the highest temperature stability) and lowest temporal average of temperature in the myocardium. Experiments were performed without heating, using an optimized imaging protocol including navigator respiratory compensation, cardiac triggering, and image processing for the compensation of motion and susceptibility artifacts. The effectiveness of blood suppression and its effect on temperature stability was evaluated in the ventricular septum of 8 healthy volunteers using multi-slice double inversion recovery (MDIR), motion-sensitized driven equilibrium (MSDE), and inflow saturation by saturation slabs (IS) over a period of 50 seconds of free breathing. It was shown that blood suppression during MR Thermometry improves the CNR and the robustness of the applied motion correction algorithm. This was confirmed in the temperature stability. Furthermore, a gradient echo sequence with EPI readout acceleration and parallel imaging (SENSE) in combination with inflow saturation blood suppression was shown to achieve the best results. A temperature stability of 2°C or better in the ventricular septum, with a spatial resolution of 3.5 x 3.5 x 8 mm3, and a temporal resolution corresponding to the heart rate of the volunteer were observed. Our results indicate that blood suppression is necessary and improves the temperature stability when performing cardiac MR Thermometry. The proposed MR Thermometry protocol, which optimizes temperature stability in the ventricular
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Real-time MR-Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Mario Ries, Chrit Moonen, Bruno Quesson, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift–based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2°C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
Baudouin Denis De Senneville - One of the best experts on this subject based on the ideXlab platform.
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real time mr Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Bruno Quesson, M Ries, Chrit T W Moonen, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift-based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2 degrees C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
Mario Ries - One of the best experts on this subject based on the ideXlab platform.
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Towards Optimized MR Thermometry of the Human Heart at 3T
NMR in Biomedicine, 2012Co-Authors: Silke Hey, Alexandru Cernicanu, Baudouin Denis De Senneville, Sébastien Roujol, Mario Ries, Pierre Jais, Chrit Moonen, Bruno QuessonAbstract:Catheter ablation using radio-frequency (RF) has been used increasingly for the treatment of cardiac arrhythmias. Proton resonance frequency shift (PRFS) based MR Thermometry may provide intra-procedural feedback on the temperature distribution, helping with the determination of the therapy endpoint. As a step towards PRFS-based cardiac Thermometry at 3T, we evaluated the suitability of two different MR Thermometry sequences (TFE and TFE-EPI) and three blood suppression techniques using as a criterion the highest signal-to-noise (SNR) and contrast-to-noise ratios (CNR), as well as the lowest temporal temperature standard deviation (corresponding to the highest temperature stability) and lowest temporal average of temperature in the myocardium. Experiments were performed without heating, using an optimized imaging protocol including navigator respiratory compensation, cardiac triggering, and image processing for the compensation of motion and susceptibility artifacts. The effectiveness of blood suppression and its effect on temperature stability was evaluated in the ventricular septum of 8 healthy volunteers using multi-slice double inversion recovery (MDIR), motion-sensitized driven equilibrium (MSDE), and inflow saturation by saturation slabs (IS) over a period of 50 seconds of free breathing. It was shown that blood suppression during MR Thermometry improves the CNR and the robustness of the applied motion correction algorithm. This was confirmed in the temperature stability. Furthermore, a gradient echo sequence with EPI readout acceleration and parallel imaging (SENSE) in combination with inflow saturation blood suppression was shown to achieve the best results. A temperature stability of 2°C or better in the ventricular septum, with a spatial resolution of 3.5 x 3.5 x 8 mm3, and a temporal resolution corresponding to the heart rate of the volunteer were observed. Our results indicate that blood suppression is necessary and improves the temperature stability when performing cardiac MR Thermometry. The proposed MR Thermometry protocol, which optimizes temperature stability in the ventricular
-
Real-time MR-Thermometry and dosimetry for interventional guidance on abdominal organs
Magnetic Resonance in Medicine, 2010Co-Authors: Sébastien Roujol, Mario Ries, Chrit Moonen, Bruno Quesson, Baudouin Denis De SennevilleAbstract:The use of proton resonance frequency shift–based magnetic resonance (MR) Thermometry for interventional guidance on abdominal organs is hampered by the constant displacement of the target due to the respiratory cycle and the associated Thermometry artifacts. Ideally, a suitable MR Thermometry method should for this role achieve a subsecond temporal resolution while maintaining a precision comparable to those achieved on static organs while not introducing significant processing latencies. Here, a computationally effective processing pipeline for two-dimensional image registration coupled with a multibaseline phase correction is proposed in conjunction with high-frame-rate MRI as a possible solution. The proposed MR Thermometry method was evaluated for 5 min at a frame rate of 10 images/sec in the liver and the kidney of 11 healthy volunteers and achieved a precision of less than 2°C in 70% of the pixels while delivering temperature and thermal dose maps on the fly. The ability to perform MR Thermometry and dosimetry in vivo during a real intervention was demonstrated on a porcine kidney during a high-intensity focused ultrasound heating experiment.
