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Treatment planning in Cobalt‐60 radiotherapy using computerized tomography techniques
Author(s) -
Payne William H.,
Waggener Robert G.,
McDavid William D.,
Dennis Michael J.
Publication year - 1978
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594393
Subject(s) - medical physics , radiation therapy , radiation treatment planning , tomography , medical imaging , computed tomography , medicine , nuclear medicine , radiology , computer science
Cobalt‐60 transmission measurements were made through an Alderson phantom utilizing a transverse axial tomographic device and a NaI (Tl) detector. Measurements were made on different sections of the phantom for as many as 162 angles and 120 linear increments. The attenuation coefficients were reconstructed using both convolution and algebraic reconstruction techniques. Three‐dimensional isodose distributions were obtained using the reconstructed attenuation coefficients. Comparison with standard treatment plans and measured isodose distribution using TLD techniques suggest that a more accurate isodose distribution may be obtained using the reconstructed attenuation coefficients, particularly in regions involving tissue heterogeneities.