CROSS-SECTIONAL CLINICAL STUDY TO EVALUATE THE PTV (PLANNING TARGET VOLUME) MARGIN ERRORS HEAD, NECK, AND BREAST CANCER

Abstract

Background: To provide quality assurance in patients receiving radiation therapy for different types of cancer, it is
critical to accurately assess the setup faults.
Aim: The current cross-sectional clinical study set out to evaluate the PTV (planning target volume) margin errors in
individuals with head, neck, and breast cancer in a random and systematic manner.
Methods: A total of 100 participants with breast cancer and 96 subjects with head and neck cancer were evaluated
in this study. Treatment setup and radiation were carried out using EPIDs (electronic portal imaging). The
treatment's mistakes were evaluated using the Herk formula, and conclusions were drawn.
Results: On the x, y, and z axes, PTV margin shifting error was 1.41, 2.31, and 1.48 mm for breast cancer and 2.77,
1.53, and 4.36 mm for head and neck cancer.For breast cancer, the random error was 0.64, 0.70, and 0.77 mm; for
head and neck cancer, it was 0.80, 0.66, and 0.92 mm. On the x, y, and z-axes, the systematic error was, however,
0.87, 0.41, and 1.47 mm for head and neck cancer and 0.37, 0.72, and 0.36 mm for breast cancer.
Conclusion: Based on the study's limitations, it may be concluded that the location of tumors affects the setup
mistakes in cancer. The current study highlights the potential benefits of utilising electronic portal imaging
equipment to lower setup verification procedure uncertainty.