Low-Dose Computed Tomography With Two- and Three-Dimensional Postprocessing as an Alternative to Plain Radiography...

Area of Science:

• Medical Imaging
• Radiology
• Intrathecal Drug Delivery

Background:

• Plain radiography is currently used for intrathecal device visualization but has limitations in imaging related structures.
• Computed tomography (CT) scans, including non-contrast 2D and 3D reconstructions, have been employed for troubleshooting intrathecal drug delivery systems.

Purpose of the Study:

• To evaluate a low-dose, single-energy 2D and 3D CT scan technique for high-resolution imaging of poorly opaque intrathecal catheters.
• To assess this CT technique as a potential substitute for plain radiography, aiming for limited radiation exposure.

Main Methods:

• A catheter was placed in a fatty substance on an anthropomorphic abdomen phantom.
• CT scans were performed with varying kVp settings and tin beam filtering.
• Dose levels were adjusted to approximate the effective dose of plain x-ray examinations.

Main Results:

• The optimal imaging parameters were identified as Sn100 kVp, offering a balance between visibility, artifacts, and noise at a fixed dose.
• While 3D VRT imaging was challenging at low doses, complementary 2D projections enabled a comprehensive evaluation.

Conclusions:

• The study successfully identified the catheter and surrounding structures using the low-dose CT technique.
• This method shows potential to replace plain radiography for intrathecal device visualization, offering improved image quality and comparable radiation exposure.