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The value of DTI: achieving high diagnostic performance for brain metastasis
Ma Liheng1, Xu Guofan2, Rosario Francesco Balzano3
1Imaging Department, First Affiliated Hospital of Guangdong Pharmaceutical University, Guangzhou City, Guangdong Province, China.
Background:
The evaluation of brain metastases generally requires post-contrast MRI exam, but some patients have contraindication to contrast medium administration.
Purpose:
To investigate the value of the MRI diffusion tensor imaging (DTI) for detection of metastatic brain tumor.
Materials And Methods:
We retrospectively analyzed the MRI data from 23 patients (13 males and 10 females) with brain metastases. The MRI protocol consisted in T1WI, T2WI, post-contrast 3DT1WI and DTI images (b = 1000) sequences. The brain metastatic lesions were counted in each of these sequences. We compared the advantages and limitations of different sequences in the brain metastases detection. The number of metastatic lesions identified on the contrast-enhanced 3DT1WI image is used as the reference. FA values were measured in the intratumoral, adjacent peritumoral and distant peritumoral edema area (PTEA) of brain metastasis, and the differences were statistically analyzed.
Results:
DTI can detect more brain metastatic lesions rather than T1WI and T2WI. The number of brain metastases on DTI is similar to post-contrast 3D T1WI. There is no statistical difference in the FA value change between the adjacent and distant PTEA.
Conclusion:
The DTI original image can be used as an alternative examination for patients with contraindications to contrast-enhanced MRI. It has high sensitivity to intratumoral hemorrhage, which has advantage to detect brain metastatic lesions as compared with T1WI or T2WI images.
Insights
Diffusion tensor imaging (DTI) detects more brain metastatic lesions than T1WI or T2WI, offering an alternative for patients unable to undergo contrast-enhanced MRI. DTI shows similar detection rates to contrast-enhanced 3D T1WI.
Area of Science:
- Neuroradiology
- Medical Imaging
- Oncology
Background:
- Brain metastases evaluation typically requires contrast-enhanced MRI.
- Contrast agents pose contraindications for some patients.
- Alternative imaging methods are needed for detecting brain tumors.
Purpose of the Study:
- To assess the efficacy of MRI diffusion tensor imaging (DTI) in detecting brain metastatic tumors.
- To compare DTI with conventional MRI sequences for brain metastasis detection.
Main Methods:
- Retrospective analysis of MRI data from 23 patients with brain metastases.
- Acquisition of T1WI, T2WI, post-contrast 3DT1WI, and DTI sequences.
- Counting metastatic lesions across sequences and comparing detection rates; FA values analyzed in peritumoral edema.
Main Results:
- DTI identified more metastatic lesions than T1WI and T2WI.
- DTI detection rates were comparable to post-contrast 3D T1WI.
- No significant difference in FA values between adjacent and distant peritumoral edema.
Conclusions:
- DTI serves as a viable alternative to contrast-enhanced MRI for patients with contraindications.
- DTI exhibits high sensitivity to intratumoral hemorrhage, aiding metastatic lesion detection.
- DTI offers advantages over T1WI and T2WI for brain metastatic lesion identification.
