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A novel approach of dose mapping using a humanoid breast phantom in radiotherapy

D P Banjade, PhD, AMINSTP 1 B S Ng, BSc, MSc 2 M Zakir, Dip RT 2 A A Tajuddin, PhD 1 and A Shukri, PhD 1

1 School of Physics, Universiti Sains Malaysia, 11800 Penang and 2 Hospital Pantai Mutiara, 82 Jalan Tengah, Bayan Baru, 11900 Penang, Malaysia



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  		Figure 1. (a) The treatment planning system (TPS) generated two-dimensional dose distribution in the isocentric slice of the breast phantom. (b) The TPS generated dose distribution in the isocentric slice of the breast phantom (a three-dimensional observer's eye view image).

 


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  		Figure 2. (a) The treatment planning system (TPS) generated dose distribution in the slice 2 cm inferior from the isocentric slice of the breast phantom. (b) The TPS generated dose distribution in the slice 6 cm inferior from the isocentric slice of the breast phantom. (c) The TPS generated dose distribution in the slice 5 cm superior from the isocentric slice of the breast phantom.

 


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  		Figure 3. Measured and planned isodose distribution in a humanoid breast phantom exposed by a 6 MV linear accelerator beam. {blacktriangleup}, film; , thermoluminescent dosemeter (TLD); {circ}, treatment planning system (TPS).

 


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  		Figure 4. Results of mapped dose in an isocentric slice (Figure 1aGo) of the phantom, using thermoluminescent dosemeters (red data) and films (blue data) against the treatment planning system dose of 100 cGy throughout the planned target volume.

 


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  		Figure 5. (a) Results of mapped dose in a phantom slice, 2 cm inferior from the isocentric slice, using thermoluminescent dosemeters (TLDs) against treatment planning system (TPS) planned dose as shown in Figure 2aGo. (b) Results of mapped dose in a phantom slice 6 cm inferior from the isocentric slice, using TLDs against TPS planned dose as shown in Figure 2bGo. (c) Results of mapped dose in a phantom slice 5 cm superior from the isocentric slice, using TLDs against TPS planned dose as shown in Figure 2cGo.

 




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