Doses in critical organs during total body irradiation before bone marrow transplantation.
OBJECTIVE
Modification of the total body irradiation technique before bone marrow transplantation has been implemented to improve uniformity of the dose inside the irradiated body and to obtain appropriate reduction in doses in critical organs.


METHODS
The total dose of 12.6 Gy was delivered with the use of a combination of the following fields: lateral, anterior-posterior, field to mediastinum, an electron field to the thorax wall and field to coxa. The doses were calculated for ten transverse body sections. Methods of dose reductions in critical regions by splitting different fields were proposed.


RESULTS
The resulting dose deviations inside the body with the combination of all the implemented fields varied from 12.5 Gy to 13.6 Gy along the midline and from 12.4 Gy to 13.7 Gy outside the midline. Doses to the lungs were reduced to 8.6 Gy divided Gy 9.4 Gy, whereas those in the thorax wall and mediastinum were increased to 12.7 Gy divided by 13.5 Gy respectively. Doses to lenses were 12.9 Gy divided by 13.1 Gy.
Malicki
J
J
Greatpoland Cancer Center, Poznań, Poland.
D001822:Body Burden; D016026:Bone Marrow Transplantation; D002648:Child; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000628:therapy; D008168:Lung / Q000528:radiation effects; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000628:therapy; D011879:Radiotherapy Dosage; D014916:Whole-Body Irradiation / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*