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Nakamura Y, Higaki T, Akiyama Y, et al. Diffusion-weighted MR imaging of non-complicated hepatic cysts: Value of 3T computed diffusion-weighted imaging. Eur J Radiol Open. 2016;3:138-44doi: 10.1016/j.ejro.2016.07.001.
Nakamura, Y., Higaki, T., Akiyama, Y., Fukumoto, W., Kajiwara, K., Kaichi, Y., Honda, Y., Komoto, D., Tatsugami, F., Iida, M., Ohmoto, T., Date, S., & Awai, K. (2016). Diffusion-weighted MR imaging of non-complicated hepatic cysts: Value of 3T computed diffusion-weighted imaging. European journal of radiology open, 3138-44. https://doi.org/10.1016/j.ejro.2016.07.001
Nakamura, Yuko, et al. "Diffusion-weighted MR imaging of non-complicated hepatic cysts: Value of 3T computed diffusion-weighted imaging." European journal of radiology open vol. 3 (2016): 138-44. doi: https://doi.org/10.1016/j.ejro.2016.07.001
Nakamura Y, Higaki T, Akiyama Y, Fukumoto W, Kajiwara K, Kaichi Y, Honda Y, Komoto D, Tatsugami F, Iida M, Ohmoto T, Date S, Awai K. Diffusion-weighted MR imaging of non-complicated hepatic cysts: Value of 3T computed diffusion-weighted imaging. Eur J Radiol Open. 2016 Jul 18;3:138-44. doi: 10.1016/j.ejro.2016.07.001. eCollection 2016. PMID: 27489867; PMCID: PMC4959945.
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Eur J Radiol Open. 2016 Jul 18;3:138-44. doi: 10.1016/j.ejro.2016.07.001. eCollection 2016.

Diffusion-weighted MR imaging of non-complicated hepatic cysts: Value of 3T computed diffusion-weighted imaging.

European journal of radiology open

Yuko Nakamura, Toru Higaki, Yuji Akiyama, Wataru Fukumoto, Kenji Kajiwara, Yoko Kaichi, Yukiko Honda, Daisuke Komoto, Fuminari Tatsugami, Makoto Iida, Toshifumi Ohmoto, Shuji Date, Kazuo Awai

Affiliations

  1. Diagnostic Radiology, Hiroshima University, Hiroshima, Japan.
  2. Department of Radiology, Hiroshima University Hospital, Hiroshima, Japan.
  3. Radiology, Kure City Medical Association Hospital, Kure, Japan.

PMID: 27489867 PMCID: PMC4959945 DOI: 10.1016/j.ejro.2016.07.001

Abstract

PURPOSE: To investigate the utility of computed 3T diffusion-weighted imaging (c-DWI) for the diagnosis of non-complicated hepatic cysts with a focus on the T2 shine-through effect.

MATERIALS AND METHODS: In 50 patients with non-complicated hepatic cysts we acquired one set of DWIs (b-value 0 and 1000 s/mm(2)) at 1.5T, and two sets at 3T (b-value 0 and 1000 s/mm(2), TE 70 ms; b-value 0 and 600 s/mm(2), TE 60 ms). We defined the original DWIs acquired with b = 1000 s/mm(2) at 1.5T and 3T as "o-1.5T-1000" and "o-3T-1000". c-DWIs were calculated with 3T DWI at b-values of 0 and 600 s/mm(2). c-DWI with b = 1000 and 1500 s/mm(2) were defined as "c-1000" and "c-1500". Radiologists evaluated the signal intensity (SI) of the cysts using a 3-point score where 1 = not visible, 2 = discernible, and 3 = clearly visible. They calculated the contrast ratio (CR) between the cysts and the surrounding liver parenchyma on each DWIs and recorded the apparent diffusion coefficient (ADC) with a b-value = 0 and 1000 s/mm(2) on 1.5T- and 3T DWIs.

RESULTS: Compared with o-1.5T-1000 DWI, the visual scores of all but the c-1500 DWIs were higher (p = 0.07 for c-1500- and p < 0.01 for the other DWIs). The CR at b = 1000 s/mm(2) was higher on o-3T-1000- than on o-1.5T-1000- (p < 0.01) but not higher than on c-1500 DWIs (p = 0.96). The CR at b = 0 s/mm(2) on 3T images with TE 70 ms was higher than on 1.5T images (p < 0.01). The ADC value was higher for 3T- than 1.5T images (p < 0.01).

CONCLUSIONS: Non-complicated hepatic cysts showed higher SI on o-3T-1000- than o-1.5T-1000 DWIs due to the T2-shine through effect. This high SI was suppressed on c-1500 DWIs.

Keywords: ADC, apparent diffusion coefficient; CR, contrast ratio; Computed diffusion-weighted imaging; DWI, diffusion-weighted imaging; Diffusion-weighted imaging; Field strength; HCC, hepatocellular carcinoma; MRI, magnetic resonance imaging; Non-complicated hepatic cysts; SI, signal intensity; SNR, signal-to-noise ratio; T1-WI, T1-weighted MRI; T2 shine-through effect; T2-WI, T2-weighted MRI; c-DWI, computed diffusion-weighted imaging

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