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Diffusion-weighted imaging of the liver: comparison of navigator triggered and breathhold acquisitions.
J Magn Reson Imaging. 2009 Sep; 30(3):561-8.JM

Abstract

PURPOSE

To compare a free breathing navigator triggered single shot echoplanar imaging (SS EPI) diffusion-weighted imaging (DWI) sequence with prospective acquisition correction (PACE) with a breathhold (BH) DWI sequence for liver imaging.

MATERIALS AND METHODS

Thirty-four patients were evaluated with PACE-DWI and BH DWI of the liver using b-values of 0, 50, and 500 s/mm(2). There were 29 focal liver lesions in 18 patients. Qualitative evaluation was performed on a 3-point scale (1-3) by two independent observers (maximum score 9). Quantitative evaluation included estimated SNR (signal to noise ratio), lesion-to-liver contrast ratio, liver and lesion apparent diffusion coefficients (ADCs), and coefficient of variation (CV) of ADC in liver parenchyma and focal liver lesions (estimate of noise contamination in ADC).

RESULTS

PACE-DWI showed significantly better image quality, higher SNR and lesion-to-liver contrast ratio when compared with BH DWI. ADCs of liver and focal lesions with both sequences were significantly correlated (r = 0.838 for liver parenchyma, and 0.904 for lesions, P < 0.0001), but lower with the BH sequence (P < 0.02). There was higher noise contamination in ADC measurement obtained with BH DWI (with a significantly higher SD and CV of ADC).

CONCLUSION

The use of a navigator echo to trigger SS EPI DWI improves image quality and liver to lesion contrast, and enables a more precise ADC quantification compared with BH DWI acquisition.

Authors+Show Affiliations

NYU Medical Center, Department of Radiology, New York, NY, USA. btaouli@yahoo.comNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article

Language

eng

PubMed ID

19711402

Citation

Taouli, Bachir, et al. "Diffusion-weighted Imaging of the Liver: Comparison of Navigator Triggered and Breathhold Acquisitions." Journal of Magnetic Resonance Imaging : JMRI, vol. 30, no. 3, 2009, pp. 561-8.
Taouli B, Sandberg A, Stemmer A, et al. Diffusion-weighted imaging of the liver: comparison of navigator triggered and breathhold acquisitions. J Magn Reson Imaging. 2009;30(3):561-8.
Taouli, B., Sandberg, A., Stemmer, A., Parikh, T., Wong, S., Xu, J., & Lee, V. S. (2009). Diffusion-weighted imaging of the liver: comparison of navigator triggered and breathhold acquisitions. Journal of Magnetic Resonance Imaging : JMRI, 30(3), 561-8. https://doi.org/10.1002/jmri.21876
Taouli B, et al. Diffusion-weighted Imaging of the Liver: Comparison of Navigator Triggered and Breathhold Acquisitions. J Magn Reson Imaging. 2009;30(3):561-8. PubMed PMID: 19711402.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Diffusion-weighted imaging of the liver: comparison of navigator triggered and breathhold acquisitions. AU - Taouli,Bachir, AU - Sandberg,Alison, AU - Stemmer,Alto, AU - Parikh,Tejas, AU - Wong,Samson, AU - Xu,Jian, AU - Lee,Vivian S, PY - 2009/8/28/entrez PY - 2009/8/28/pubmed PY - 2009/10/21/medline SP - 561 EP - 8 JF - Journal of magnetic resonance imaging : JMRI JO - J Magn Reson Imaging VL - 30 IS - 3 N2 - PURPOSE: To compare a free breathing navigator triggered single shot echoplanar imaging (SS EPI) diffusion-weighted imaging (DWI) sequence with prospective acquisition correction (PACE) with a breathhold (BH) DWI sequence for liver imaging. MATERIALS AND METHODS: Thirty-four patients were evaluated with PACE-DWI and BH DWI of the liver using b-values of 0, 50, and 500 s/mm(2). There were 29 focal liver lesions in 18 patients. Qualitative evaluation was performed on a 3-point scale (1-3) by two independent observers (maximum score 9). Quantitative evaluation included estimated SNR (signal to noise ratio), lesion-to-liver contrast ratio, liver and lesion apparent diffusion coefficients (ADCs), and coefficient of variation (CV) of ADC in liver parenchyma and focal liver lesions (estimate of noise contamination in ADC). RESULTS: PACE-DWI showed significantly better image quality, higher SNR and lesion-to-liver contrast ratio when compared with BH DWI. ADCs of liver and focal lesions with both sequences were significantly correlated (r = 0.838 for liver parenchyma, and 0.904 for lesions, P < 0.0001), but lower with the BH sequence (P < 0.02). There was higher noise contamination in ADC measurement obtained with BH DWI (with a significantly higher SD and CV of ADC). CONCLUSION: The use of a navigator echo to trigger SS EPI DWI improves image quality and liver to lesion contrast, and enables a more precise ADC quantification compared with BH DWI acquisition. SN - 1053-1807 UR - https://www.unboundmedicine.com/medline/citation/19711402/Diffusion_weighted_imaging_of_the_liver:_comparison_of_navigator_triggered_and_breathhold_acquisitions_ L2 - https://doi.org/10.1002/jmri.21876 DB - PRIME DP - Unbound Medicine ER -