Polymer gel dosimetry on a multislice computed tomography scanner: effect of changing parameters on CTDI

Area of Science:

• Medical Physics
• Radiological Dosimetry
• Polymer Science

Background:

• Conventional dosimetry in CT scans can be complex.
• Polymer gel dosimeters present a potential alternative for radiation dose measurement.
• Accurate dose assessment is crucial for patient safety in CT imaging.

Purpose of the Study:

• To evaluate polymer gel dosimeters as an alternative to conventional methods for CT dosimetry.
• To investigate the performance of polymer gel dosimeters in measuring CT radiation doses.
• To compare polymer gel dosimetry with Thermoluminescent Dosimetry (TLD) and ionization chamber measurements.

Main Methods:

• Polymer gel dosimeters were used to measure CT radiation doses.
• Measurements were conducted in phantoms of varying diameters.
• CTDI was investigated across a range of mAs, tube voltage, and slice widths.
• Results were compared with TLD and ionization chamber measurements.

Main Results:

• Polymer gel dosimeters showed comparable results to TLD and ionization chambers.
• CTDI increased with mAs, tube voltage, and decreased with phantom diameter.
• Slice width variations had a greater impact on measurements with smaller slice widths.

Conclusions:

• Polymer gel dosimetry is a suitable alternative for measuring CT radiation doses.
• It can be effectively used for determining Slice Width Dose Profile (SWDP) and CTDI calculations.
• This method offers a promising approach for routine CT dosimetry.