Abstract
Objectives
To investigate the reproducibility of arterial spin labelling (ASL) and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and quantitatively compare these techniques for the measurement of renal blood flow (RBF).
Methods
Sixteen healthy volunteers were examined on two different occasions. ASL was performed using a multi-TI FAIR labelling scheme with a segmented 3D-GRASE imaging module. DCE MRI was performed using a 3D-FLASH pulse sequence. A Bland-Altman analysis was used to assess repeatability of each technique, and determine the degree of correspondence between the two methods.
Results
The overall mean cortical renal blood flow (RBF) of the ASL group was 263 ± 41 ml min−1 [100 ml tissue]−1, and using DCE MRI was 287 ± 70 ml min−1 [100 ml tissue]−1. The group coefficient of variation (CVg) was 18 % for ASL and 28 % for DCE-MRI. Repeatability studies showed that ASL was more reproducible than DCE with CVgs of 16 % and 25 % for ASL and DCE respectively. Bland-Altman analysis comparing the two techniques showed a good agreement.
Conclusions
The repeated measures analysis shows that the ASL technique has better reproducibility than DCE-MRI. Difference analysis shows no significant difference between the RBF values of the two techniques.
Key Points
• Reliable non-invasive monitoring of renal blood flow is currently clinically unavailable.
• Renal arterial spin labelling MRI is robust and repeatable.
• Renal dynamic contrast-enhanced MRI is robust and repeatable.
• ASL blood flow values are similar to those obtained using DCE-MRI.
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Acknowledgments
The authors would like to thank Kidney Research UK for their generous funding and Dr. Martin King for advice on statistical analyses. We would also like to thank Dr. Matthias Günther for providing the 3D GRASE ASL pulse sequence.
The scientific guarantor of this publication is Dr. Christopher Clark. The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article. This study has received funding by Kidney Research UK. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (healthy volunteers) in this study. Some study subjects or cohorts have been previously reported by Cutajar et al. [36]. This was an observational study performed at one institution.
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Cutajar, M., Thomas, D.L., Hales, P.W. et al. Comparison of ASL and DCE MRI for the non-invasive measurement of renal blood flow: quantification and reproducibility. Eur Radiol 24, 1300–1308 (2014). https://doi.org/10.1007/s00330-014-3130-0
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DOI: https://doi.org/10.1007/s00330-014-3130-0