Use Dose Bricks Concept to Implement Nasopharyngeal Carcinoma Treatment Planning

Figure 8

Mechanical isocenter checks of SIV, RSAO, and LSAO field in dose brick technique. Film was put at the isocenter, perpendicular to treatment table top and exposure by RSAO, LSAO, and SIV. The opposite arrow sign can be used to check the performance of machine mechanical isocenter on the junction (white dash line) of RSAO, LSAO, and SVI.