| ZHANG Shaogang,WANG Lianyuan,et al.Experimental study of dosimetry for intra-operative radiotherapy[J].Chinese Journal of Radiological Medicine and Protection,2001,21(5):371-374 |
| Experimental study of dosimetry for intra-operative radiotherapy |
| Received:December 17, 2000 |
| DOI： |
| KeyWords:Intra-operative radio therapy(IORT) Dosimetry Phantoms |
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| Abstract:: |
| Objective To study and compare the dosimetry for intra operative radiotherapy in three kinds of phantoms;water,solid water and polymethyl ones. Methods The absorbed dose from electrons of the accelerator with the applicator for intra operative radiotherapy was measured using an ionization chamber fixed on each phantom.The dose at the specific depth in water on the beam central axis was adjusted to 1 cGy per monitor unit for the reference applicator with SSDat 100 cm for all energy levels of electrons.Then the applicator for intra operative radiotherapy was used with no other change,i.e.the output factor was measurd.The values of MU per cGy absorbed dose for all applictors in water phantom were calculated,and these values were used to calculate the MUvalue per cGy absorbed dose from the output factors for solid and polymethyl phantoms. Results The deviation from water phantom was 0.27% and 0.45% for polymethyl and solid water ones,respectively. Conclusion Using a polymethyl phantom to measure the absorbed dose may be a practical method when no special water tank or solid water is available. |
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