Tube current reduction and iterative image reconstruction for computed tomography myelography

Area of Science:

• Radiology
• Medical Imaging
• Radiation Oncology

Background:

• Computed tomography (CT) myelography is crucial for spinal imaging.
• Optimizing radiation dose while maintaining diagnostic quality is a key challenge.

Purpose of the Study:

• To evaluate the impact of a low-dose (LD) CT myelography protocol on image quality, intervention planning confidence, and diagnostic yield.
• To assess the feasibility of tube current reduction in CT myelography.

Main Methods:

• Retrospective analysis of 68 patients undergoing CT myelography (34 standard-dose [SD], 34 LD).
• Scans were matched for patient demographics and clinical factors.
• Image quality, artifacts, contrast, and intervention confidence were assessed by two readers using Likert scales.
• Image noise and radiation dose metrics (CTDIvol, SSDE) were compared between SD and LD protocols.

Main Results:

• Image quality, artifacts, contrast, and confidence for intervention planning/guidance were rated good to perfect for both SD and LD protocols.
• Inter-reader agreement for intervention planning and guidance was good to very good (κ ≥ 0.77).
• Image noise was similar between SD and LD scans.
• LD protocol significantly reduced radiation dose (CTDIvol, SSDE) compared to SD protocol (p < 0.05).

Conclusions:

• A LD CT myelography protocol with tube current reduction is feasible and reduces radiation exposure.
• LD imaging does not negatively impact image quality, diagnostic confidence, or diagnostic certainty.
• Iterative image reconstruction further enhances the benefits of LD protocols.