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Dosimetric charactetriristics of aluminium tissue compensators for 60Co and 6MV x rays

In Journal of Medical Physics
By: Dayanand S.
Contributor(s): Dinshaw KA | Agarwal JP | Deshpande D | Malhotra HK | .
Material type: materialTypeLabelArticleSeries: Vol 26 Issues 1.Publisher: 2001Description: 23-28.Subject(s): External radiotherapy(EXTRT) | Aluminium tissue compensator | 60Co and 6 MV x-rays | RadiotherapyDDC classification: C.0642 In: Journal of Medical PhysicsSummary: Dosimetric analysis of aluminium (Al) tissue compensator used for 60Co and 6 MV x-ray beams is presented. A method to determine the thickness of aluminium required to compensate various tissue deficit conditions at different depths of compensation and field sizes is described for both the energies. The thickness of Al required to compensate for a particular missing tissue thickness increases in a slight non-linear manner with the depth of compensation and decreases with field size. When the tissue compensator data generated at 5 cm depth and for 10 x 10 cm2 field is used to compensate at different depths and field sizes, the maximum error in dose delivery limits to 3.4% for both the beam energies. Another source of error in making tissue compensator is the thickness denomination of Al blocks and was found to be < 4% for extreme minimal depth of dose compensation (1.5 cm), when the thickness variation of Al blocks is 0.25 cm. This is the maximum error, which could arise from all possible sources of limitatio
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Articles Articles Tata Memorial Hospital
C.0642 (Browse shelf) Available AR1314

Dosimetric analysis of aluminium (Al) tissue compensator used for 60Co and 6 MV x-ray beams is presented. A method to determine the thickness of aluminium required to compensate various tissue deficit conditions at different depths of compensation and field sizes is described for both the energies. The thickness of Al required to compensate for a particular missing tissue thickness increases in a slight non-linear manner with the depth of compensation and decreases with field size. When the tissue compensator data generated at 5 cm depth and for 10 x 10 cm2 field is used to compensate at different depths and field sizes, the maximum error in dose delivery limits to 3.4% for both the beam energies. Another source of error in making tissue compensator is the thickness denomination of Al blocks and was found to be < 4% for extreme minimal depth of dose compensation (1.5 cm), when the thickness variation of Al blocks is 0.25 cm. This is the maximum error, which could arise from all possible sources of limitatio

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