Optimal b Values for Generation of Computed High-b-Value DW Images

AJR. American Journal of Roentgenology
Akio OguraNatsumi Yamaguchi

Abstract

The purpose of this study was to investigate the optimal b values required for the generation of computed high-b-value DW images. Brain DWI was performed for eight subjects using 16 b values, ranging from 0 s/mm(2) to 5000 s/mm(2). The fractional value as the turning point between the fast and slow components was determined using a diffusion decay curve. Image contrast in the white matter, gray matter, thalamus, putamen, and lateral ventricle was compared between the acquired high-b-value images and the computed high-b-value images derived from various b value images. In addition, the signal-to-noise ratio of each computed image and acquired image was measured and compared. The fractional values obtained from the diffusion decay curve were between 1200 and 1800 s/mm(2). Image contrast in all regions was nearly equivalent between the acquired and computed high-b-value images when b values higher than the fractional value were used, whereas image contrast was significantly different between the two sets of images when b values lower than the fractional value were used (p < 0.05). The computed images derived from low-b-value images showed a higher signal-to-noise ratio, compared with the acquired images. Optimal b values should be...Continue Reading

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Citations

Sep 1, 2016·AJR. American Journal of Roentgenology·Akio OguraHaruyuki Watanabe
Jul 12, 2018·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Toru HigakiKazuo Awai
Sep 4, 2018·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Yoshiko R UenoTakamichi Murakami
Aug 2, 2018·Pediatric Radiology·Jordan B RappDavid M Biko

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