Verification of total body photon irradiation dosimetry techniques
A method of verifying the dosimetry of patients undergoing total body irradiation (TBI) with photon beams having energies from cobalt-60 to 25 MV is presented. A simple set of spot checks at the TBI axis has been used to verify data used for TBI dosimetry. Calculations to verify dose delivered to TBI patients are done in the same manner as those irradiated at standard treatment distances. A simple method of effective field size determination for various anatomical locations in a typical adult is presented. Measurements in an Alderson phantom with thermoluminescent dosimeters and an ion chamber at several anatomical locations indicate that this calculational method can predict the dose along the patient axis to within 4% for /sup 60/Co and 18-MV photon beams, provided the dosimetry data are appropriate (as determined by the spot checks). Results of intercomparisons of TBI beam calibration, off-axis and depth-dose data at various institutions visited by the Radiological Physics Center are also presented.
- Research Organization:
- The University of Texas, M. D. Anderson Hospital and Tumor Institute, Radiological Physics Center, Houston, Texas 77030
- OSTI ID:
- 6990251
- Journal Information:
- Med. Phys.; (United States), Vol. 15:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GAMMA DOSIMETRY
WHOLE-BODY IRRADIATION
BONE MARROW
CALIBRATION
COBALT 60
DEPTH DOSE DISTRIBUTIONS
LEUKEMIA
PHANTOMS
RADIOTHERAPY
THERMOLUMINESCENT DOSEMETERS
ANIMAL TISSUES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
COBALT ISOTOPES
DISEASES
DOSEMETERS
DOSIMETRY
EXTERNAL IRRADIATION
HEMATOPOIETIC SYSTEM
HEMIC DISEASES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IRRADIATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MEDICINE
MINUTES LIVING RADIOISOTOPES
MOCKUP
NEOPLASMS
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
ORGANS
RADIATION DOSE DISTRIBUTIONS
RADIOISOTOPES
RADIOLOGY
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
THERAPY
TISSUES
YEARS LIVING RADIOISOTOPES
655003* - Medical Physics- Dosimetry