*Intensity Modulated Radiation Therapy Plan (IMRT) Verification Using Indigenous… DOI: http://dx.doi.org/10.5772/intechopen.102710*

A heterogeneous pelvic phantom was designed, shown in **Figure 2**, which was made of wax, a male pelvic bone (**Figure 3**), water, and borax powder. To construct the phantom, male pelvic bone with a density equivalent to that of human pelvic bone was placed in a cylindrical-shaped container. After placing it, a round plastic ball filled with water was placed for bladder. Borax powder with glue and water was placed below the bladder for rectum. Subsequently, molten wax was poured into it and allowed to solidify. After complete solidification of the wax, the outer container was cut and removed. A cavity was prepared at approximately geometrical center of phantom volume, and a 0.6 cm3 ion chamber was kept in the same position till the end

**Figure 2.** *Designed pelvic phantom.*

**Figure 3.** *Male pelvic and femur bone used in developed phantom.*

**Figure 4.** *CT slice of developed phantom with different parts.*

of experiment, **Figure 4**. The three fiducially lead markers were put on two bilateral points, and one anterior point was placed on the surface of the phantom in the same cross-sectional plane to make three reference points [15].

Brivo CT 325 2-slice CT (Wipro GE Healthcare, WI, USA) has been utilized for computed tomography (CT) of the phantom and the CT images were taken at a slice thickness of 3 mm for planning purposes. The CT images were imported into the treatment planning system. The width and height were measured using the length measuring tool available in Treatment Planning System (TPS). The mean width and height were measured as 29 cm and 25 cm in CT images of heterogeneous pelvic phantom, respectively. These geometries of the phantom show that it can accommodate delivered beam field sizes and shapes. It allows the establishment of 3D locations. It is easy to transport, set up, align, and takedown in an accurate and efficient manner.
