A film dosimetry system for use in computed tomography

Area of Science:

• Medical Physics
• Radiological Imaging
• Radiation Dosimetry

Background:

• Accurate surface dose calculation is crucial for computed tomography (CT) procedures.
• Traditional dosimetry methods like thermoluminescent dosimetry (TLD) can be complex and time-consuming.
• A need exists for a simpler, more detailed method to assess CT surface dose distribution.

Purpose of the Study:

• To introduce and evaluate a novel film dosimetry system for CT surface dose calculation.
• To compare the performance of this film dosimetry system with thermoluminescent dosimetry (TLD).
• To demonstrate the system's ability to provide detailed dose distribution maps.

Main Methods:

• Utilizing Kodak XV-2 film wrapped around a cylindrical water-filled phantom to record dose distribution.
• Implementing the film dosimetry system for various CT scanner models.
• Comparing film dosimetry results with measurements obtained from thermoluminescent dosimetry (TLD).

Main Results:

• The film dosimetry system is simpler to operate than TLD.
• The system generates detailed maps of the surface dose distribution.
• Accuracy within +/-15% was achieved when compared to TLD measurements across different CT scanners.

Conclusions:

• The described film dosimetry system provides a practical and effective method for CT surface dose assessment.
• This system offers a valuable alternative to TLD for detailed dose distribution analysis.
• The system demonstrates reliable accuracy for routine CT dosimetry applications.