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Constrained optimiz...
Constrained optimization of gradient waveforms for generalized diffusion encoding
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- Sjölund, Jens (författare)
- Linköpings universitet,Institutionen för medicinsk teknik,Centrum för medicinsk bildvetenskap och visualisering, CMIV,Tekniska högskolan,Elekta Instrument AB, Sweden
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- Nilsson, Markus (författare)
- Lund University,Lunds universitet,Lund University Bioimaging Center,Medicinska fakulteten,MR Physics,Forskargrupper vid Lunds universitet,Multidimensional microstructure imaging,Faculty of Medicine,Lund University Research Groups,MR Physics, Lund University, Sweden
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- Topgaard, Daniel (författare)
- Physical Chemistry, Lund University, Sweden
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- Westin, Carl-Fredrik (författare)
- Linköpings universitet,Medicinsk informatik,Tekniska högskolan
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- Knutsson, Hans (författare)
- Linköpings universitet,Institutionen för medicinsk teknik,Centrum för medicinsk bildvetenskap och visualisering, CMIV,Tekniska högskolan
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- Szczepankiewicz, Filip (författare)
- Lund University,Lunds universitet,Medicinsk strålningsfysik, Lund,Sektion V,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,MR Physics,Forskargrupper vid Lunds universitet,Multidimensional microstructure imaging,Medical Radiation Physics, Lund,Section V,Department of Clinical Sciences, Lund,Faculty of Medicine,Lund University Research Groups
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(creator_code:org_t)
- Elsevier, 2015
- 2015
- Engelska.
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Ingår i: Journal of magnetic resonance. - : Elsevier. - 1090-7807 .- 1096-0856. ; 261, s. 157-168
- Relaterad länk:
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https://europepmc.or...
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http://www.ncbi.nlm....
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Diffusion MRI is a useful probe of tissue structure. The prototypical diffusion encoding sequence, the single pulsed field gradient, has recently been challenged with the introduction of more general gradient waveforms. Out of these, we focus on q-space trajecory imaging, which generalizes the scalar b-value to a tensor valued property. To take full advantage of its capabilities, it is imperative to respect the constraints imposed by the hardware, while at the same time maximizing the diffusion encoding strength. We formulate this as a constrained optimization problem that accomodates constraints on maximum gradient amplitude, slew rate, coil heating and positioning of radiofrequency pulses. The power of this approach is demonstrated by a comparison with previous work on optimization of isotropic diffusion sequences, showing possible gains in diffusion weighting or in heat dissipation, which in turn means increased signal or reduced scan-times.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk bildbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Image Processing (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
Nyckelord
- Diffusion MR; Generalized gradient waveforms; Q-space trajectory imaging; Optimization; Hardware constraints
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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