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Quantitative Proton Chemical-shift Imaging by Richard B. Buxton; Gary L. Wismer; Thomas J. Brady; Bruce R. Rosen is a Medicine article available to read on EtoBox.

What is Quantitative Proton Chemical-shift Imaging about?

Recently W. T. Dixon (Radiology 153, 189 (1984)) introduced a simple method of proton chemical-shift imaging which requires only two images, a conventional (in-phase) image and an image in which fat and water protons are 180" out of phase during signal acquisition, to separate the signals from fat and water protons. We have tested the application of this method to the quantitative determination of fat content and fat and water longitudinal relaxation times, and analyzed the effects of random and systematic errors. Ten phantoms were constructed with a range of fat contents (0-5070 by weight) and water Ti's (300-800 ms). Fat and water Tl's were measured with a 0.6-T clinical imaging system in two ways: (1) using the system as a spectrometer with all gradients off, and (2) from least-squares fits to in-phase and out-of-phase image data made with six values of T,. The imagederived values of water TI agreed well with spectrometerderived values (r = 0.97) and the image derived fat fraction correlated strongly with the fat fraction by weight (r = 0.995). The effects of random and systematic errors were analyzed for a minimum data set of four images: in-phase and out-of-phase images at two

Who reads Quantitative Proton Chemical-shift Imaging?

Author

Richard B. Buxton; Gary L. Wismer; Thomas J. Brady; Bruce R. Rosen

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0740-3194)

Published

1986

Language

EN

Field

Medicine (Health Sciences)