Optimization of exposure parameters for cone beam computed tomography sialography

Area of Science:

• Radiology
• Medical Imaging
• Cone Beam CT (CBCT)

Background:

• Image quality assessment is vital for developing new imaging protocols.
• Cone beam CT (CBCT) sialography is a developing imaging technique.
• Prior research established a preliminary CBCT sialography protocol.

Purpose of the Study:

• To optimize the CBCT sialography protocol by maximizing signal difference-to-noise ratio (SDNR).
• To correlate optimized imaging parameters with previously published dosimetric data for CBCT sialography.

Main Methods:

• An imaging phantom with varying iodine concentrations and a water-immersed mandible was used.
• The CB MercuRay system was employed with diverse peak kilovoltage (kVp) and milliamperage (mA) settings.
• Signal difference-to-noise ratio (SDNR) was calculated from raw images, and a figure of merit (FOM) was determined.

Main Results:

• SDNR increased with higher kVp (60-120) and mA (15 mA).
• Higher iodine concentrations improved SDNR.
• The optimal figure of merit (FOM) was achieved with 80 kVp and either 10 mA or 15 mA.

Conclusions:

• The optimized protocol for CBCT sialography involves 80 kVp and 10 mA.
• This protocol aims to maximize image quality while considering radiation dose.
• The findings provide a refined protocol for CBCT sialography using the CB MercuRay system.