A New Technique for CT/MR Fusion For Skull Base Imaging

Area of Science:

• Neurosurgery
• Radiology
• Medical Imaging

Background:

• Skull base lesions present complex diagnostic and surgical challenges.
• Accurate anatomical assessment is crucial for effective treatment planning.
• Current imaging modalities may offer limited combined visualization of bony and soft tissue structures.

Purpose of the Study:

• To present initial experience with CT and MR image fusion for skull base lesions.
• To evaluate the benefits of fused imaging in surgical and radiotherapy planning.
• To assess the improved understanding of lesion extent and anatomical relationships.

Main Methods:

• Eleven patients with skull base lesions underwent CT and MR imaging.
• Customized software was used for coregistration of CT and MR datasets.
• A high-speed graphic computing system facilitated interactive viewing of fused images.

Main Results:

• Image fusion allowed simultaneous visualization of bony (CT) and soft tissue (MR) anatomy.
• Fused images improved assessment of lesion extent and relationship to adjacent structures.
• Enhanced awareness of lesion location relative to critical neurovascular anatomy (e.g., cavernous sinuses, carotid arteries).
• Improved delineation of tumors within the internal auditory canal.

Conclusions:

• CT and MR image fusion provides a unique imaging format superior to single modality display.
• Image fusion is beneficial for surgical planning of skull base lesions.
• Fused imaging aids in treatment planning for complex skull base malignancies, including radiotherapy.