TY - JOUR
T1 - Dosimetry considerations for a lipowitz metal tissue compensator system
AU - Henderson, Sheri D.
AU - Purdy, James A.
AU - Gerber, Russell L.
AU - Mestman, Scott J.
PY - 1987/7
Y1 - 1987/7
N2 - The present report describes the fabrication technique and the dosimetry aspects of a new compensator system that uses the low melting point allow Lipowitz metal. Compensating ratios (CR, mm of tissue compensated per mm of cerrobend) were determined for various field sizes and depths for 60Co, and X ray energies of 4, 6, 18, and 25 MV. Typical CR for 10 cm × 10 cm field and 10 cm depth were: 60Co, 4 MV, and 6 MV,1:15;18 and 25 MV, 1:20. Verification of these CR were performed at 6 MV using polystyrene phantoms. Ionization measurements were made for various field sizes and depths and normalized to central axis full-phantom readings for both compensated and non-compensated fields. Without compensation, percent differences ranged as high as 40% for a tissue deficit of 10 cm. With the compensating filters (CF) in place, this difference was reduced to 2-4% Overall, the CF system was capable of producing dose uniformity to within ±10% for a wide range of depths and field sizes.
AB - The present report describes the fabrication technique and the dosimetry aspects of a new compensator system that uses the low melting point allow Lipowitz metal. Compensating ratios (CR, mm of tissue compensated per mm of cerrobend) were determined for various field sizes and depths for 60Co, and X ray energies of 4, 6, 18, and 25 MV. Typical CR for 10 cm × 10 cm field and 10 cm depth were: 60Co, 4 MV, and 6 MV,1:15;18 and 25 MV, 1:20. Verification of these CR were performed at 6 MV using polystyrene phantoms. Ionization measurements were made for various field sizes and depths and normalized to central axis full-phantom readings for both compensated and non-compensated fields. Without compensation, percent differences ranged as high as 40% for a tissue deficit of 10 cm. With the compensating filters (CF) in place, this difference was reduced to 2-4% Overall, the CF system was capable of producing dose uniformity to within ±10% for a wide range of depths and field sizes.
KW - Dosimetry
KW - Lipowitz metal
KW - Tissue compensation
UR - http://www.scopus.com/inward/record.url?scp=0023269157&partnerID=8YFLogxK
U2 - 10.1016/0360-3016(87)90051-4
DO - 10.1016/0360-3016(87)90051-4
M3 - Article
C2 - 3597153
AN - SCOPUS:0023269157
SN - 0360-3016
VL - 13
SP - 1107
EP - 1112
JO - International journal of radiation oncology, biology, physics
JF - International journal of radiation oncology, biology, physics
IS - 7
ER -