The Active plaque hierarchical menu.

• Allow multiple plaques - Plaque simulator supports up to four alternative plaques per plan, but normally only one plaque is "active" at any time. This item enables dose to be calculated and summed from multiple plaques. Unchecked by default.
• 1. Plaque name - if checked, this plaque is used to calculate dose.
• 2. Plaque name - if checked, this plaque is used to calculate dose.
• 3. Plaque name - if checked, this plaque is used to calculate dose.
• 4. Plaque name - if checked, this plaque is used to calculate dose.