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.

### Pub Type(s)

Evaluation Studies

Journal Article

Research Support, N.I.H., Extramural

Research Support, U.S. Gov't, Non-P.H.S.

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 -