Integral and shell-MIP display algorithms in MR and CT three-dimensional models of the brain surface

Area of Science:

• Radiology
• Medical Imaging
• Neuroimaging

Background:

• Three-dimensional (3-D) visualization techniques are crucial for understanding complex cerebral venous anatomy.
• Conventional maximum intensity projection (MIP) and shaded-surface-display (SSD) algorithms have limitations in depicting superficial venous structures.

Purpose of the Study:

• To evaluate the efficacy of integral and shell maximum intensity projection (shell-MIP) algorithms for 3-D CT and MR imaging of cerebral gyral and surface venous anatomy.
• To compare the performance of these novel algorithms against traditional MIP and SSD algorithms.

Main Methods:

• Integral and shell-MIP display algorithms were developed using voxel layers from 3-D models.
• Algorithmic performance was assessed using contrast-enhanced spoiled gradient-recalled acquisition in a steady state (SPGR) MR venograms (n=9) for anatomical detail and CT venograms (n=7) for filling defect conspicuity.
• Twelve contrast-enhanced 3-D MR models were evaluated for neurosurgical planning utility.

Main Results:

• Shell-MIP and integral algorithms achieved higher subjective MR gyral quality scores (7.00 and 6.78, respectively) compared to SSD (3.89) and MIP (1.06).
• Confidence scores for central sulcus identification were significantly higher with shell-MIP (7.67) and integral (7.00) compared to SSD (3.22) and MIP (1.00).
• Shell-MIP (4.36) and integral (4.29) demonstrated superior confidence in identifying filling defects on CT venograms compared to MIP (3.00).

Conclusions:

• Integral and shell-MIP algorithms are effective 3-D display tools for visualizing superficial cerebral veins and gyri on MR images.
• These algorithms are also valuable for detecting thrombosis on CT venograms.
• The enhanced visualization provided by integral and shell-MIP aids in neurosurgical planning and diagnosis of cerebrovascular disorders.