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Measurement of Hyperpolarized Gas Diffusion at Very Short Time Scales by Michael Carl; G. Wilson Miller; John P. Mugler III; Scott Rohrbaugh; William A. Tobias; Gordon D. Cates Jr. is a Chemistry article available to read on EtoBox.

What is Measurement of Hyperpolarized Gas Diffusion at Very Short Time Scales about?

We present a new pulse sequence for measuring very-short-time-scale restricted diffusion of hyperpolarized noble gases. The pulse sequence is based on concatenating a large number of bipolar diffusion-sensitizing gradients to increase the diffusion attenuation of the MR signal while maintaining a fundamentally short diffusion time. However, it differs in several respects from existing methods that use oscillating diffusion gradients for this purpose. First, a wait time is inserted between neighboring pairs of gradient pulses; second, consecutive pulse pairs may be applied along orthogonal axes; and finally, the diffusion-attenuated signal is not simply read out at the end of the gradient train but is periodically sampled during the wait times between neighboring pulse pairs. The first two features minimize systematic differences between the measured (apparent) diffusion coefficient and the actual time-dependent diffusivity, while the third feature optimizes the use of the available MR signal to improve the precision of the diffusivity measurement in the face of noise. The benefits of this technique are demonstrated using theoretical calculations, Monte-Carlo simulations of gas diff

Who reads Measurement of Hyperpolarized Gas Diffusion at Very Short Time Scales?

Author

Michael Carl; G. Wilson Miller; John P. Mugler III; Scott Rohrbaugh; William A. Tobias; Gordon D. Cates Jr.

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)