Sökning: WFRF:(Teh Irvin) >
Motion-compensated ...
Motion-compensated gradient waveforms for tensor-valued diffusion encoding by constrained numerical optimization
-
- Szczepankiewicz, Filip (författare)
- Lund University,Lunds universitet,Diagnostisk radiologi, Lund,Sektion V,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,MR Physics,Forskargrupper vid Lunds universitet,Multidimensional microstructure imaging,Diagnostic Radiology, (Lund),Section V,Department of Clinical Sciences, Lund,Faculty of Medicine,Lund University Research Groups,Brigham and Women's Hospital / Harvard Medical School,Harvard Medical School,Harvard Med Sch, Boston, MA 02115 USA.;Brigham & Womens Hosp, Radiol, 75 Francis St, Boston, MA 02115 USA.;Lund Univ, Clin Sci Lund, Diagnost Radiol, Lund, Sweden.
-
- Sjölund, Jens, Biträdande lektor, 1987- (författare)
- Uppsala universitet,Uppsala University,Avdelningen för systemteknik,Artificiell intelligens,Elekta Instrument AB, Stockholm, Sweden.
-
- Dall'Armellina, Erica (författare)
- University of Leeds,Univ Leeds, Leeds Inst Cardiovasc & Metab Med, Leeds, W Yorkshire, England.
-
visa fler...
-
- Plein, Sven (författare)
- University of Leeds,Univ Leeds, Leeds Inst Cardiovasc & Metab Med, Leeds, W Yorkshire, England.
-
- Schneider, Jürgen E (författare)
- Univ Leeds, Leeds Inst Cardiovasc & Metab Med, Leeds, W Yorkshire, England.
-
- Teh, Irvin (författare)
- Leeds Beckett University,Univ Leeds, Leeds Inst Cardiovasc & Metab Med, Leeds, W Yorkshire, England.
-
- Westin, Carl-Fredrik (författare)
- Harvard Medical School,Harvard Med Sch, Boston, MA 02115 USA.;Brigham & Womens Hosp, Radiol, 75 Francis St, Boston, MA 02115 USA.
-
visa färre...
-
(creator_code:org_t)
- 2020-10-13
- 2021
- Engelska.
-
Ingår i: Magnetic Resonance in Medicine. - : Wiley. - 1522-2594 .- 0740-3194. ; 85:4, s. 2117-2126
- Relaterad länk:
-
http://dx.doi.org/10... (free)
-
visa fler...
-
https://onlinelibrar...
-
https://doi.org/10.1...
-
https://uu.diva-port... (primary) (Raw object)
-
https://lup.lub.lu.s...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- PURPOSE: Diffusion-weighted MRI is sensitive to incoherent tissue motion, which may confound the measured signal and subsequent analysis. We propose a "motion-compensated" gradient waveform design for tensor-valued diffusion encoding that negates the effects bulk motion and incoherent motion in the ballistic regime.METHODS: Motion compensation was achieved by constraining the magnitude of gradient waveform moment vectors. The constraint was incorporated into a numerical optimization framework, along with existing constraints that account for b-tensor shape, hardware restrictions, and concomitant field gradients. We evaluated the efficacy of encoding and motion compensation in simulations, and we demonstrated the approach by linear and planar b-tensor encoding in a healthy heart in vivo.RESULTS: The optimization framework produced asymmetric motion-compensated waveforms that yielded b-tensors of arbitrary shape with improved efficiency compared with previous designs for tensor-valued encoding, and equivalent efficiency to previous designs for linear (conventional) encoding. Technical feasibility was demonstrated in the heart in vivo, showing vastly improved data quality when using motion compensation. The optimization framework is available online in open source.CONCLUSION: Our gradient waveform design is both more flexible and efficient than previous methods, facilitating tensor-valued diffusion encoding in tissues in which motion would otherwise confound the signal. The proposed design exploits asymmetric encoding times, a single refocusing pulse or multiple refocusing pulses, and integrates compensation for concomitant gradient effects throughout the imaging volume.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Nyckelord
- Diffusion
- Diffusion Magnetic Resonance Imaging
- Heart/diagnostic imaging
- Image Processing, Computer-Assisted
- Motion
- diffusion magnetic resonance imaging
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas