Effect of processor temperature on film dosimetry

Area of Science:

• Medical Physics
• Radiological Sciences

Background:

• Optical density (OD) of radiographic films is crucial for accurate radiation dosimetry.
• Key parameters influencing OD, such as beam energy and dose, are well-studied for Kodak XV and extended dose range (EDR) films.
• The effect of processor temperature on OD, however, remains under-investigated.

Purpose of the Study:

• To investigate the impact of automatic film processor temperature on the optical density (OD) of Kodak XV and EDR films.
• To establish a quantitative relationship between processor temperature and OD for radiation dosimetry applications.
• To provide a method for correcting dose measurements based on processor temperature variations.

Main Methods:

• Kodak XV and EDR films were exposed under reference conditions to a specified dose.
• Films were processed using an automatic X-Omat 5000 processor with manually adjusted temperatures ranging from 29.4°C to 40.6°C (85°F to 105°F).
• Optical density (OD) was measured for each film at each temperature to evaluate the relationship with processor temperature and dose.

Main Results:

• Optical density (OD) demonstrated a linear correlation with processor temperature for both XV and EDR films across various dose ranges.
• The relationship between changes in processor temperature and radiation dose followed a quadratic function.
• A simple linear equation was derived to describe the changes in OD relative to processor temperature.

Conclusions:

• Processor temperature is a critical, quantifiable factor affecting optical density in radiographic films used for dosimetry.
• The established linear relationship allows for dose correction in radiation dosimetry when processor temperature fluctuates.
• This research provides a valuable tool for improving the accuracy of film-based radiation dosimetry by accounting for processor temperature variations.