Utilization of the computed tomography scanner in interstitial dosimetry

Area of Science:

• Medical Physics
• Radiology
• Oncology

Background:

• Interstitial implants are used for localized radiation therapy.
• Accurate dose calculation and delivery are crucial for treatment efficacy and minimizing side effects.
• Visualizing the radiation dose distribution in relation to anatomical structures is challenging with conventional methods.

Purpose of the Study:

• To present a method for superimposing isodose distributions of interstitial implants onto computed tomography (CT) scan images.
• To enhance the accuracy of delivered radiation dose assessment.
• To improve clinical judgment in radiation therapy planning and delivery.

Main Methods:

• Developing a technique to integrate radiation isodose data with CT imaging.
• Utilizing CT scans to visualize the precise location and extent of interstitial implants.
• Superimposing calculated radiation dose contours onto the corresponding CT images.

Main Results:

• The described method allows for direct visualization of the isodose distribution overlaid on CT scans.
• This integration reduces uncertainty regarding the actual radiation dose delivered to the target volume and surrounding tissues.
• The technique has been successfully applied to various anatomical sites, including head and neck, cervix, vagina, rectum, and urethra.

Conclusions:

• Superimposing isodose distributions on CT scans is a valuable tool for interstitial brachytherapy.
• This method enhances the precision of radiation dose evaluation.
• Improved visualization facilitates better clinical decision-making and potentially optimizes treatment outcomes.