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Radial q-space sampling for DSI.
Magn Reson Med 2016; 76(3):769-80MR

Abstract

PURPOSE

Diffusion spectrum imaging (DSI) has been shown to be an effective tool for noninvasively depicting the anatomical details of brain microstructure. Existing implementations of DSI sample the diffusion encoding space using a rectangular grid. Here we present a different implementation of DSI whereby a radially symmetric q-space sampling scheme for DSI is used to improve the angular resolution and accuracy of the reconstructed orientation distribution functions.

METHODS

Q-space is sampled by acquiring several q-space samples along a number of radial lines. Each of these radial lines in q-space is analytically connected to a value of the orientation distribution functions at the same angular location by the Fourier slice theorem.

RESULTS

Computer simulations and in vivo brain results demonstrate that radial diffusion spectrum imaging correctly estimates the orientation distribution functions when moderately high b-values (4000 s/mm2) and number of q-space samples (236) are used.

CONCLUSION

The nominal angular resolution of radial diffusion spectrum imaging depends on the number of radial lines used in the sampling scheme, and only weakly on the maximum b-value. In addition, the radial analytical reconstruction reduces truncation artifacts which affect Cartesian reconstructions. Hence, a radial acquisition of q-space can be favorable for DSI. Magn Reson Med 76:769-780, 2016. © 2015 Wiley Periodicals, Inc.

Authors+Show Affiliations

Center for Advanced Imaging Innovation and Research (CAI2R), NYU School of Medicine, New York, New York, USA. Center for Biomedical Imaging, Department of Radiology, NYU School of Medicine, New York, New York, USA.Stephen Yutzy, ViewRay Inc., Oakwood Village, Ohio, USA.Center for Advanced Imaging Innovation and Research (CAI2R), NYU School of Medicine, New York, New York, USA. Center for Biomedical Imaging, Department of Radiology, NYU School of Medicine, New York, New York, USA.

Pub Type(s)

Evaluation Studies
Journal Article
Research Support, N.I.H., Extramural
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

26363002

Citation

Baete, Steven H., et al. "Radial Q-space Sampling for DSI." Magnetic Resonance in Medicine, vol. 76, no. 3, 2016, pp. 769-80.
Baete SH, Yutzy S, Boada FE. Radial q-space sampling for DSI. Magn Reson Med. 2016;76(3):769-80.
Baete, S. H., Yutzy, S., & Boada, F. E. (2016). Radial q-space sampling for DSI. Magnetic Resonance in Medicine, 76(3), pp. 769-80. doi:10.1002/mrm.25917.
Baete SH, Yutzy S, Boada FE. Radial Q-space Sampling for DSI. Magn Reson Med. 2016;76(3):769-80. PubMed PMID: 26363002.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Radial q-space sampling for DSI. AU - Baete,Steven H, AU - Yutzy,Stephen, AU - Boada,Fernando E, Y1 - 2015/09/12/ PY - 2015/01/13/received PY - 2015/08/10/revised PY - 2015/08/12/accepted PY - 2015/9/13/entrez PY - 2015/9/13/pubmed PY - 2017/12/19/medline KW - RDSI KW - angular resolution KW - diffusion spectrum imaging KW - radial q-space acquisition SP - 769 EP - 80 JF - Magnetic resonance in medicine JO - Magn Reson Med VL - 76 IS - 3 N2 - PURPOSE: Diffusion spectrum imaging (DSI) has been shown to be an effective tool for noninvasively depicting the anatomical details of brain microstructure. Existing implementations of DSI sample the diffusion encoding space using a rectangular grid. Here we present a different implementation of DSI whereby a radially symmetric q-space sampling scheme for DSI is used to improve the angular resolution and accuracy of the reconstructed orientation distribution functions. METHODS: Q-space is sampled by acquiring several q-space samples along a number of radial lines. Each of these radial lines in q-space is analytically connected to a value of the orientation distribution functions at the same angular location by the Fourier slice theorem. RESULTS: Computer simulations and in vivo brain results demonstrate that radial diffusion spectrum imaging correctly estimates the orientation distribution functions when moderately high b-values (4000 s/mm2) and number of q-space samples (236) are used. CONCLUSION: The nominal angular resolution of radial diffusion spectrum imaging depends on the number of radial lines used in the sampling scheme, and only weakly on the maximum b-value. In addition, the radial analytical reconstruction reduces truncation artifacts which affect Cartesian reconstructions. Hence, a radial acquisition of q-space can be favorable for DSI. Magn Reson Med 76:769-780, 2016. © 2015 Wiley Periodicals, Inc. SN - 1522-2594 UR - https://www.unboundmedicine.com/medline/citation/26363002/Radial_q_space_sampling_for_DSI_ L2 - https://doi.org/10.1002/mrm.25917 DB - PRIME DP - Unbound Medicine ER -