A new head holder for reducing axial movement and repositioning errors during physiological CT imaging

Area of Science:

• Neuroradiology
• Medical Imaging Technology

Background:

• Dynamic computed tomography (CT) studies of the brain require precise head immobilization.
• Patient head movement during CT scans can compromise image quality and diagnostic accuracy.
• Accurate repositioning is crucial for longitudinal studies and tracking disease progression.

Purpose of the Study:

• To develop and evaluate a novel head holder system for dynamic CT brain imaging.
• To enhance head immobilization and enable precise repositioning during CT examinations.

Main Methods:

• A custom thermoplastic face mask and foam headrest were engineered to restrict head motion.
• The system was designed to minimize movement in all directions, especially along the z-axis.
• Markers on the skin were utilized to quantitatively assess z-movement.

Main Results:

• The head holder created a rigid, detailed mold of the head, significantly minimizing motion during CT scans.
• Immobilization was achieved with less than 2.0 mm of movement under forced motion conditions.
• Repositioning accuracy was demonstrated to be within 1.5 mm after removing and reinserting the subject.

Conclusions:

• The developed head holder provides effective head immobilization for dynamic CT brain studies.
• The system facilitates accurate head repositioning, essential for follow-up imaging.
• This technology has the potential to improve the quality and reliability of dynamic brain CT examinations.