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DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
Published on: August 26, 2014
A comprehensive quantitative and qualitative assessment of TGSE-BLADE DWI in postoperative imaging following
Christer Ruff1, Till-Karsten Hauser1, Paula Bombach2
1Department of Diagnostic and Interventional Neuroradiology, Eberhard Karls-University Tuebingen, Tuebingen D-72076, Germany.
Purpose:
Postoperative MRI plays a pivotal role in assessing residual disease and planning therapy after intracranial tumor resection. As acute perioperative infarction may mimic enhancing and non-enhancing tumor tissue in follow-up imaging, the initial postoperative MRI examination is essential for this purpose. However, conventional DWI techniques like RESOLVE are often impaired by artifacts from intracranial air. This study compares RESOLVE DWI with TGSE-BLADE DWI within early postoperative scans to improve diagnostic confidence in identifying ischemic changes.
Method:
In a retrospective, institutional review board-approved study, 33 patients (mean age 52.3 ± 25.1 years) underwent a 1.5-Tesla MRI within 48 h of resection. RESOLVE and TGSE-BLADE DWI sequences were acquired in the same orientation and slice thickness of 5 mm. Two neuroradiologists blindly evaluated geometric distortion, susceptibility artifacts, overall image quality, and diagnostic confidence. Quantitative analysis included measuring signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), apparent diffusion coefficient (ADC) values, image quality metrics and resection defect dimensions against T1-weighted images.
Results:
TGSE-BLADE DWI exhibited significantly reduced geometric distortions and susceptibility artifacts near the resection site compared with RESOLVE DWI, producing superior qualitative image quality and diagnostic confidence (p < 0.001). Conversely, RESOLVE DWI yielded slightly higher SNR and CNR. Measurements of the resection defect on TGSE-BLADE DWI closely matched those on T1-weighted images (p = 0.974), while RESOLVE DWI showed a significant discrepancy (p < 0.001).
Conclusions:
TGSE-BLADE DWI significantly minimizes artifacts and geometric distortions in intracranial postoperative imaging, thereby improving the detection of perioperative ischemic changes. This robust technique serves as an effective alternative to conventional EPI-based sequences in challenging settings with pronounced B0 inhomogeneities, ultimately enhancing diagnostic confidence and patient care.
Insights
TGSE-BLADE DWI significantly reduces artifacts in postoperative MRI scans, improving the detection of ischemic changes after brain tumor surgery. This technique enhances diagnostic confidence compared to conventional RESOLVE DWI.
Area of Science:
- Radiology
- Neuroimaging
- Medical Physics
Background:
- Postoperative MRI is crucial for evaluating intracranial tumor resection outcomes.
- Acute perioperative infarction can mimic tumor recurrence on follow-up imaging.
- Conventional DWI sequences often suffer from artifacts in the postoperative setting.
Purpose of the Study:
- To compare RESOLVE DWI and TGSE-BLADE DWI for early postoperative MRI after intracranial tumor resection.
- To assess the diagnostic confidence in identifying ischemic changes using these DWI techniques.
- To evaluate artifact reduction and image quality in challenging postoperative neuroimaging.
Main Methods:
- Retrospective analysis of 33 patients undergoing 1.5-Tesla MRI within 48 hours of resection.
- Acquisition of RESOLVE and TGSE-BLADE DWI sequences with identical parameters.
- Blind evaluation of image quality, artifacts, and diagnostic confidence by two neuroradiologists.
- Quantitative analysis of SNR, CNR, ADC values, and resection defect dimensions.
Main Results:
- TGSE-BLADE DWI demonstrated significantly fewer geometric distortions and susceptibility artifacts (p < 0.001).
- Qualitative image quality and diagnostic confidence were superior with TGSE-BLADE DWI (p < 0.001).
- Resection defect measurements on TGSE-BLADE DWI closely matched T1-weighted images (p = 0.974), unlike RESOLVE DWI (p < 0.001).
Conclusions:
- TGSE-BLADE DWI effectively minimizes artifacts and geometric distortions in postoperative intracranial imaging.
- This technique improves the detection of perioperative ischemic changes, enhancing diagnostic confidence.
- TGSE-BLADE DWI is a valuable alternative to conventional EPI-based sequences in complex MRI scenarios.
