Abstract
Objectives
The study aimed to assess the efficiency of whole-body high-resolution compressed sensing-sensitivity encoding isotropic T1-Weighted Dixon (CSI-T1W-Dixon) scans in evaluating bone metastasis.
Methods
Forty-five high-risk prostate cancer patients with bone metastases were enrolled prospectively and underwent whole-body MRI sequences, which included the following: pre- and post-contrast CSI-T1W-Dixon and conventional multi-planar T1-Weighted Dixon (CMP-T1W-Dixon) (coronal, sagittal, and axial scans), short tau inversion recovery (STIR), and DWI. Comparison between the CMP-T1W-Dixon and CSI-T1W-Dixon images was done for the subjective image quality, the quantitative contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR). Furthermore, the diagnostic performance based on per-lesion and per-patient basis utilizing non-contrast T1-weighted (T1)/T1+ contrasted T1-weighted (T1C)/T1 + T1C + STIR + DWI sequences was compared between the CSI-T1W-Dixon and CMP-T1W-Dixon methods using reference standards (combining biopsy data and 6-month imaging follow-up).
Result
The CSI-T1W-Dixon images produced fewer image artifacts in the axial and coronal planes compared to the CMP-T1W-Dixon images. Also, the CSI-T1W-Dixon images provided better a CNR in fat-only images of all three planes and water-only images of the axial plane (p < 0.05). The CSI-T1W-Dixon showed a higher sensitivity than the CMP-T1W-Dixon techniques in analyzing T1-only images on a per-lesion basis (82.7% vs. 53.8% for sensitivity, p = 0.03). On a per-patient basis, no difference was found in the diagnostic capacity between the CSI-T1W-Dixon and CMP-T1W-Dixon sequences either alone or in combinations (p = 0.57–1).
Conclusion
High-resolution CSI-T1W-Dixon with higher image quality and diagnostic capacity can replace the CMP-T1W-Dixon method in evaluating bone metastasis in clinical practice.
Key Points
• Compressed sensing isotropic acquisition for 3D T1-weighted Dixon images can improve the image quality with fewer artifacts compared to the anisotropic multiplanar acquisition.
• Compressed sensing isotropic acquisition can save 67% of scanning time compared to anisotropic multiplanar acquisition.
• Compressed sensing isotropic 3D T1-weighted Dixon images can offer better diagnostic performance with higher sensitivity compared to anisotropic multiplanar images.
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Abbreviations
- AUC:
-
Area under the operating characteristic curve
- CMP:
-
Conventional multiplanar
- CMP-T1W-Dixon:
-
Conventional multi-planar T1-Weighted Dixon
- CNR:
-
Contrast-to-noise ratio
- Compressed SENSE:
-
Compressed sensing-sensitivity encoding
- CSI:
-
Compressed SENSE isotropic
- CSI-T1W-Dixon:
-
Compressed SENSE isotropic T1-Weighted Dixon
- CT:
-
Computed tomography
- DWI:
-
Diffusion-weighted imaging
- F:
-
Fat-only
- IP:
-
In-phase
- MRI:
-
Magnetic resonance imaging
- OP:
-
Out-of-phase
- PET:
-
Positron emission tomography
- PI:
-
Parallel imaging
- ROC:
-
Receiver operating characteristic
- ROI:
-
Region of interest
- SD:
-
Standard deviation
- SI:
-
Signal intensity
- SNR:
-
Signal-to-noise ratio
- STIR:
-
Short tau inversion recovery
- T1:
-
Noncontrast T1-weighted
- T1C:
-
Contrast T1-weighted
- T1W:
-
T1-Weighted
- W:
-
Water-only
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Acknowledgements
The authors thank Yong Zhang for his assistance in image analysis.
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The scientific guarantor of this publication is Zhenhong Liao.
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One of the authors of this manuscript (Xiaoyong Zhang) was an employee of Philips Medical Systems International. The remaining authors declare no relationships with any companies whose products or services may be related to the subject matter of the article.
Statistics and biometry
One of the authors (Zhenhong Liao) has significant statistical expertise.
No complex statistical methods were necessary for this paper.
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Written informed consent was obtained from all subjects (patients) in this study.
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Study subjects or cohorts overlap
Whole-body compressed sensing isotropic T1-weighted Dixon has not been previously reported.
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• prospective
• diagnostic study
• performed at one institution
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Liao, Z., Liu, G., Ming, B. et al. Evaluating prostate cancer bone metastasis using accelerated whole-body isotropic 3D T1-weighted Dixon MRI with compressed SENSE: a feasibility study. Eur Radiol 33, 1719–1728 (2023). https://doi.org/10.1007/s00330-022-09181-9
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DOI: https://doi.org/10.1007/s00330-022-09181-9