Pancreatic imaging using diffusivity mapping – Influence of sequence technique on qualitative and quantitative analysis
Tavakoli AA, Dreher C, Mlynarska A, Kuder TA, Gnirs R, Schlemmer HP, Bickelhaupt S (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 83
Pages Range: 33-40
DOI: 10.1016/j.clinimag.2021.11.033
Abstract
Purpose: To compare image quality of an optimized diffusion weighted imaging (DWI) sequence with advanced post-processing and motion correction (advanced-EPI) to a standard DWI protocol (standard-EPI) in pancreatic imaging. Materials and methods: 62 consecutive patients underwent abdominal MRI at 1.5 T were included in this retrospective analysis of data collected as part of an IRB approved study. All patients received a standard-EPI and an advanced-EPI DWI with advanced post-processing and motion correction. Two blinded radiologists evaluated the parameters image quality, detail of parenchyma, sharpness of boundaries and discernibility from adjacent structures on b = 900 s/mm2 images using a Likert-like scale. Segmentation of pancreatic head, body and tail were obtained and apparent diffusion coefficient (ADC) was calculated separately for each region. Apparent tissue-to-background ratio (TBR) was calculated at b = 50 s/mm2 and at b = 900 s/mm2. Results: The advanced-EPI yielded significantly higher scores for pancreatic parameters of image quality, detail level of parenchyma, sharpness of boundaries and discernibility from adjacent structures in comparison to standard-EPI (p < 0.001 for all, kappa = [0.46,0.71]) and was preferred in 96% of the cases when directly compared. ADC of the pancreas was 7% lower in advanced-EPI (1.236 ± 0.152 vs. 1.146 ± 0.126 μm2/ms, p < 0.001). ADC in the pancreatic tail was significantly lower for both sequences compared to head and body (all p < 0.001). There was comparable TBR for both sequences at b = 50 s/mm2 (standard-EPI: 19.0 ± 5.9 vs. advanced-EPI: 19.0 ± 6.4, p = 0.96), whereas at b = 900 s/mm2, TBR was 51% higher for advanced-EPI (standard-EPI: 7.1 ± 2.5 vs. advanced-EPI: 10.8 ± 5.1, p < 0.001). Conclusion: An advanced DWI sequence might increase image quality for focused imaging of the pancreas and providing improved parenchymal detail levels compared to a standard DWI.
Involved external institutions
Germany (DE)How to cite
APA:
Tavakoli, A.A., Dreher, C., Mlynarska, A., Kuder, T.A., Gnirs, R., Schlemmer, H.P., & Bickelhaupt, S. (2022). Pancreatic imaging using diffusivity mapping – Influence of sequence technique on qualitative and quantitative analysis. Clinical Imaging, 83, 33-40. https://doi.org/10.1016/j.clinimag.2021.11.033
MLA:
Tavakoli, Anoshirwan Andrej, et al. "Pancreatic imaging using diffusivity mapping – Influence of sequence technique on qualitative and quantitative analysis." Clinical Imaging 83 (2022): 33-40.
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