Berg, Johanna and Månsson, Sven and Svensson, Jonas and Ekberg, Olle and Müller, Markus F. (2013) Impact of Field Strength and Respiratory Motion Control on Diffusion-Weighted MR Imaging of the Liver. Open Journal of Medical Imaging, 03 (01). pp. 31-39. ISSN 2164-2788
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Abstract
Purpose: To evaluate the impact of field strength and respiratory motion control on diffusion-weighted MR imaging (DWI) of the liver at 1.5 and 3 T. Material and Methods: Three DWI sequences using seven b-values from 20 - 400 s/mm2 were designed with identical parameters but with different handling of respiratory motion [respiratory triggered (RT), free breathing (FB), breath hold (BH)] on 3 T and 1.5 T. Thirteen volunteers were examined at a 3 T and six of them also at a 1.5 T magnet. DW images were analyzed quantitatively and qualitatively. Regions of interest were placed in cranial, middle and caudal parts of the right liver lobe (RLL) and ADC and SNR were calculated. Results: ADC in RLL tended to be lower at 3 T MRI. Least inter-subject ADC variability was found with RT in the middle RLL at 3 T. Highest ADCs were found caudally in the RLL. Significant differences in ADC between middle and caudal RLL were calculated in FB and RT at 3 T and FB and BH at 1.5 T, respectively. No significant difference in SNR was found between 3 T and 1.5 T. There were significantly more artifacts in the left liver lobe (LLL) compared to the RLL in all sequences and in the LLL at 3 T compared to 1.5 T. Conclusion: Our study suggests that longitudinal hepatic ADC measurements should be performed using equivalent field strength, b-values, and acquisition technique, given influence of these factors on ADC measurements.
Item Type: | Article |
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Subjects: | East India Archive > Medical Science |
Depositing User: | Unnamed user with email support@eastindiaarchive.com |
Date Deposited: | 01 Apr 2023 08:08 |
Last Modified: | 06 Sep 2024 09:11 |
URI: | http://ebooks.keeplibrary.com/id/eprint/609 |