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Comparison of Point Spread Function Encoding EPI DWI and Turbo Gradient Spin Echo BLADE DWI for Imaging Intracranial
Wen Zhong1, Zhimin Huang2, Kun Zhou3
1Center for Biomedical Imaging Research, School of Biomedical Engineering, Tsinghua University, Beijing, China (W.Z., Y.L., L.H., H.G.).
Point spread function-encoded echo planar imaging (PSF-EPI) offers superior image quality and signal-to-noise ratio for intracranial tumor diffusion-weighted imaging (DWI) compared to TGSE-BLADE. Both methods provide distortion-free imaging with comparable apparent diffusion coefficient measurements.
Area of Science:
- Radiology
- Medical Imaging
- Neuro-oncology
Background:
- Diffusion-weighted imaging (DWI) is crucial for diagnosing and monitoring intracranial tumors.
- Traditional DWI sequences can suffer from geometric distortions and artifacts.
- Point spread function-encoded echo planar imaging (PSF-EPI) and turbo gradient spin echo BLADE (TGSE-BLADE) are advanced DWI techniques aiming for distortion-free imaging.
Purpose of the Study:
- To compare the image quality and quantitative parameters of PSF-EPI and TGSE-BLADE for DWI of intracranial tumors.
- To evaluate the diagnostic performance of these sequences in terms of tumor depiction, artifacts, and geometric distortion.
- To assess the reliability of apparent diffusion coefficient (ADC) measurements between the two techniques.
Main Methods:
- A prospective study involving 37 patients with intracranial tumors.
- Acquisition of 3 Tesla MRI using both PSF-EPI and TGSE-BLADE DWI sequences.
- Independent evaluation of qualitative parameters (tumor depiction, artifacts, distortion, image quality) and quantitative metrics (SNR, CNR, ADC) by two radiologists.
Main Results:
- PSF-EPI demonstrated significantly better tumor depiction and overall image quality compared to TGSE-BLADE (p<0.01).
- No significant differences were observed in artifact or distortion scores between the two sequences.
- PSF-EPI yielded significantly higher signal-to-noise ratio (SNR) (p<0.001), while tumor contrast was slightly higher in TGSE-BLADE (p=0.034).
- ADC measurements showed good agreement between PSF-EPI and TGSE-BLADE in both normal-appearing white matter and tumors.
Conclusions:
- Both PSF-EPI and TGSE-BLADE provide distortion-free DWI for intracranial tumors.
- PSF-EPI offers superior image quality and higher SNR, making it advantageous for lesion conspicuity and anatomical delineation.
- Comparable ADC measurements support the clinical utility of PSF-EPI as a robust technique for intracranial tumor imaging.
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Computed Tomography (CT) scan:
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