Abstract
Purpose
To obtain the optimal simultaneous-multislice (SMS)—accelerated diffusion-weighted imaging (DWI) of the liver at 3.0 T MRI by systematically estimating the repeatability of apparent diffusion coefficient (ADC), signal-to-noise ratio (SNR) and image quality of different breathing schemes in comparison to standard DWI (STD) and other SMS sequences.
Methods
In this institutional review board-approved prospective study, hepatic DWIs (b = 50, 300, 600 s/mm2) were performed in 23 volunteers on 3.0 T MRI using SMS and STD with breath-hold (BH-SMS, BH-STD), free-breathing (FB-SMS, FB-STD) and respiratory-triggered (RT-SMS, RT-STD). Reduction of scan time with SMS-acceleration was calculated. ADC and SNR were measured in nine anatomic locations and image quality was assessed on all SMS and STD sequences. An optimal SMS-DWI was decided by systematically comparing the ADC repeatability, SNR and image quality among above DWIs.
Results
SMS-DWI reduced scan time significantly by comparison with corresponding STD-DWI (27 vs. 42 s for BH, 54 vs. 78 s for FB and 42 vs. 97 s for RT). In all DWIs, BH-SMS had the greatest intraobserver agreement (intraclass correlation coefficient (ICC): 0.920–0.944) and good interobserver agreement (ICC: 0.831–0.886) for ADC measurements, and had the best ADC repeatability (mean ADC absolute differences: 0.046–0.058 × 10−3mm2/s, limits of agreement (LOA): 0.010–0.013 × 10−3mm2/s) in nine locations. BH-SMS had the highest SNR in three representative sections except for RT-STD. There were no significant differences in image quality between BH-SMS and other DWI sequences (median BH-SMS: 4.75, other DWI: 4.5–5.0; P > 0.0.5).
Conclusion
BH-SMS provides considerable scan time reduction with good image quality, sufficient SNR and highest ADC repeatability on 3.0 T MRI, which is thus recommended as the optimal hepatic DWI sequence for those subjects with adequate breath-holding capability.
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Abbreviations
- SMS:
-
Simultaneous-multislice
- DWI:
-
Diffusion-weighted imaging
- STD:
-
Standard DWI
- ADC:
-
Apparent diffusion coefficient
- SNR:
-
Signal-to-noise ratio
- BH:
-
Breath-hold
- FB:
-
Free-breathing
- RT:
-
Respiratory-triggered
- ICC:
-
Intraclass correlation coefficient
- LOA:
-
Limits of agreement
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Funding
This work was supported by the National Natural Science Foundation of China (Grant Number: 81371541, Beijing, China), Natural Science Foundation of HuNan Province (Grant Number: 2018JJ2656, Changsha, China), and China Postdoctoral Science Foundation(Grant Number: 2019M652807, Beijing, China).
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Pei, Y., Xie, S., Li, W. et al. Evaluation of simultaneous-multislice diffusion-weighted imaging of liver at 3.0 T with different breathing schemes. Abdom Radiol 45, 3716–3729 (2020). https://doi.org/10.1007/s00261-020-02538-y
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DOI: https://doi.org/10.1007/s00261-020-02538-y