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British Journal of Radiology (2006) 79, 331-335
© 2006 British Institute of Radiology
doi: 10.1259/bjr/16208090
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Peripheral dose from uniform dynamic multileaf collimation fields: implications for sliding window intensity-modulated radiotherapy

D S Sharma, MSc, DipRP1, Animesh, MSc, DipRP2, S S Deshpande, MSc, DipRP1, R D Phurailatpam, MSc, DipRP3, D D Deshpande, PhD1, S K Shrivastava, MD4 and K A Dinshaw, FRCR4

Departments of 1 Medical Physics and 4 Radiation Oncology, Tata Memorial Hospital, Dr. Ernest Borges Marg, Parel, Mumbai, 400 012, India, 2 Kirloskar Theratronics, Mumbai and 3 Clinical Research Centre, ACTREC, New Mumbai, India


Figure 1
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  		Figure 1. Peripheral dose in phantom from 6 MV X-ray for 0° collimator and field sizes (a) 6 cm x 6 cm; (b) 14 cm x 14 cm at 5 cm depth, normalized to 100% on the central axis at depth of maximum dose of static open field. MLC, multilead collimator.

 

Figure 2
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  		Figure 2. Composite peripheral dose(PD) distribution of 6 MV X-ray measured at 5 cm depth with 0° and 90° collimator angle from 10 cm x 10 cm static field shaped by jaws and multileaf collimator (MLC), normalized to 100% on the central axis at depth of maximum dose of static open field.

 

Figure 3
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  		Figure 3. Composite peripheral dose(PD) distribution of 6 MV X-ray measured at 5 cm depth with 0° and 90° collimator angles from 10 cm x 10 cm field simulated in dynamic multileaf collimation (DMLC) mode using 0.5 cm sweeping gap width, normalized to 100% on the central axis at depth of maximum dose of static open field.

 

Figure 4
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  		Figure 4. Peripheral dose(PD) in phantom from 6 MV X-rays measured at 5 cm, 10 cm and 15 cm depth with target to chamber distance of 100 cm. Effective field size of 10 cm x 10 cm having 1 cm sweeping gap width and 0° collimator is used. PD is normalized to 100% on the central axis at depth of maximum dose of static open field.

 




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