In treatment with parallel opposed fields, how is the total dose at the maximum dose point on the anterior side calculated?

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In treatment with parallel opposed fields, the maximum dose point on the anterior side can be determined by considering both the entrance and exit doses associated with the two opposing fields.

When radiation is delivered using parallel opposed fields, the field from the anterior (front) and the posterior (back) will contribute to the dose received by the tissue at the maximum dose point in the target area. The entrance dose from the anterior field represents the radiation dose given as the beam enters the patient. Conversely, the posterior field delivers radiation that exits through the anterior side, creating an additional dose at the entrance point due to radiation that continues to penetrate after exiting the posterior portion of the body.

Therefore, to accurately calculate the total dose at the maximum dose point on the anterior side, it is essential to sum both the entrance dose from the anterior field and the exit dose from the posterior field. This combined approach provides a comprehensive understanding of the total dose delivered at that specific point, ensuring that the treatment plan accounts for the full effect of radiation on the target area and surrounding tissues.

Hence, combining the entrance dose (anterior/posterior field) with the exit dose (posterior/anterior field) yields the correct calculation for the total dose at the maximum dose point on

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