scholarly journals In vivo free-breathing DTI and IVIM of the whole human heart using a real-time slice-followed SE-EPI navigator-based sequence: A reproducibility study in healthy volunteers

2016 ◽  
Vol 76 (1) ◽  
pp. spcone-spcone
Author(s):  
Kevin Moulin ◽  
Pierre Croisille ◽  
Thorsten Feiweier ◽  
Benedicte M.A. Delattre ◽  
Hongjiang Wei ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Real Time ◽  
Human Heart ◽  
Free Breathing ◽  
Time Slice ◽  
Reproducibility Study

In vivo free-breathing DTI and IVIM of the whole human heart using a real-time slice-followed SE-EPI navigator-based sequence: A reproducibility study in healthy volunteers

2015 ◽  
Vol 76 (1) ◽  
pp. 70-82 ◽  
Author(s):  
Kevin Moulin ◽  
Pierre Croisille ◽  
Thorsten Feiweier ◽  
Benedicte M.A. Delattre ◽  
Hongjiang Wei ◽  
...  
Keyword(s):  
Healthy Volunteers ◽  
Real Time ◽  
Human Heart ◽  
Free Breathing ◽  
Time Slice ◽  
Reproducibility Study

scholarly journals Free-breathing cardiac MR stress perfusion with real-time slice tracking

2013 ◽  
Vol 72 (3) ◽  
pp. 689-698 ◽  
Author(s):  
Tamer A. Basha ◽  
Sébastien Roujol ◽  
Kraig V. Kissinger ◽  
Beth Goddu ◽  
Sophie Berg ◽  
...  
Keyword(s):  
Real Time ◽  
Free Breathing ◽  
Time Slice ◽  
Stress Perfusion ◽  
Cardiac Mr

Free-Breathing Diffusion Tensor Imaging and Tractography of the Human Heart in Healthy Volunteers Using Wavelet-Based Image Fusion

2015 ◽  
Vol 34 (1) ◽  
pp. 306-316 ◽  
Author(s):  
Hongjiang Wei ◽  
Magalie Viallon ◽  
Benedicte M. A. Delattre ◽  
Kevin Moulin ◽  
Feng Yang ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Image Fusion ◽  
Healthy Volunteers ◽  
Human Heart ◽  
Diffusion Tensor ◽  
Free Breathing

scholarly journals Simultaneous acquisition of 4D ultrasound and wireless electromagnetic tracking for in-vivo accuracy validation

2017 ◽  
Vol 3 (2) ◽  
pp. 75-78 ◽  
Author(s):  
Svenja Ipsen ◽  
Ralf Bruder ◽  
Esben Schjødt Worm ◽  
Rune Hansen ◽  
Per Rugaard Poulsen ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Real Time ◽  
Ultrasound Imaging ◽  
Ground Truth ◽  
Free Breathing ◽  
Electromagnetic Tracking ◽  
Ultrasound Probe ◽  
4D Ultrasound ◽  
The Right

AbstractUltrasound is being increasingly investigated for real-time target localization in image-guided interventions. Yet, in-vivo validation remains challenging due to the difficulty to obtain a reliable ground truth. For this purpose, real-time volumetric (4D) ultrasound imaging was performed simultaneously with electromagnetic localization of three wireless transponders implanted in the liver of a radiotherapy patient. 4D ultrasound and electromagnetic tracking were acquired at framerates of 12Hz and 8Hz, respectively, during free breathing over 8 min following treatment. The electromagnetic antenna was placed directly above and the ultrasound probe on the right side of the patient to visualize the liver transponders. It was possible to record 25.7 s of overlapping ultrasound and electromagnetic position data of one transponder. Good spatial alignment with 0.6 mm 3D root-mean-square error between both traces was achieved using a rigid landmark transform. However, data acquisition was impaired since the electromagnetic tracking highly influenced the ultrasound equipment and vice versa. High intensity noise streaks appeared in the ultrasound scan lines irrespective of the chosen frequency (1.7-3.3 MHz, 2/4 MHz harmonic). To allow for target visualization and tracking in the ultrasound volumes despite the artefacts, an online filter was designed where corrupted pixels in the newest ultrasound frame were replaced with non-corrupted pixels from preceding frames. Aside from these artefacts, the recorded electromagnetic tracking data was fragmented and only the transponder closest to the antenna could be detected over a limited period of six consecutive breathing cycles. This problem was most likely caused by interference from the metal holder of the ultrasound probe and was solved in a subsequent experiment using a 3D-printed non-metal probe fixation. Real-time wireless electromagnetic tracking was compared with 4D ultrasound imaging in-vivo for the first time. For stable tracking, large metal components need to be avoided during data acquisition and ultrasound filtering is required.

scholarly journals Diffusion tensor MRI of the human heart In Vivo with a navigator based free breathing approach

2012 ◽  
Vol 14 (S1) ◽  
Author(s):  
Sonia Nielles-Vallespin ◽  
Choukri Mekkaoui ◽  
Peter D Gatehouse ◽  
Timothy G Reese ◽  
Jennifer Keegan ◽  
...  
Keyword(s):  
Human Heart ◽  
Diffusion Tensor ◽  
Free Breathing ◽  
Diffusion Tensor Mri

scholarly journals Real-time free-breathing strategy for tracking labeled cells with in-vivo vardiac MRI

2009 ◽  
Vol 11 (S1) ◽  
Author(s):  
Yijen L Wu ◽  
Cornelius Brinegar ◽  
Zhi-Pei Liang ◽  
Qing Ye ◽  
T Kevin Hitchens ◽  
...  
Keyword(s):  
Real Time ◽  
Free Breathing
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