Dose corrections for field obliquity for 45-MV x-ray therapy
Journal Article
·
· Med. Phys.; (United States)
The degree of dose perturbation produced by a 25.7-cm-diam circular water phantom was determined for a 45-MV x-ray beam by direct measurement. Data obtained in a circular and a cubical water phantom was utilized to test three accepted techniques (isodose shift, TAR method, and effective SSD method) for the correction of isodose levels to account for patient curvature. In general, the effective SSD method yielded the most accurate results for all depth including the buildup region. An isodose shift factor of 0.8 was found for the 45-MV x-ray beam. Key words: curvature corrections, 45-MV x ray, isodose shift, TAR, effective SSD method
- Research Organization:
- Emory University Clinic, Division Radiation Therapy, Atlanta, Georgia 30322
- OSTI ID:
- 6507573
- Journal Information:
- Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 10:1; ISSN MPHYA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
CALIBRATION STANDARDS
CIRCULAR CONFIGURATION
COMPARATIVE EVALUATIONS
CONFIGURATION
CORRECTIONS
DOSE RATES
DOSE-RESPONSE RELATIONSHIPS
DOSES
DOSIMETRY
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
ISODOSE CURVES
MATERIALS
MOCKUP
MUSCLES
OXYGEN COMPOUNDS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIATIONS
STANDARDS
STRUCTURAL MODELS
TISSUE-EQUIVALENT MATERIALS
WATER
X RADIATION
X-RAY DOSIMETRY
655003* -- Medical Physics-- Dosimetry
CALIBRATION STANDARDS
CIRCULAR CONFIGURATION
COMPARATIVE EVALUATIONS
CONFIGURATION
CORRECTIONS
DOSE RATES
DOSE-RESPONSE RELATIONSHIPS
DOSES
DOSIMETRY
ELECTROMAGNETIC RADIATION
HYDROGEN COMPOUNDS
IONIZING RADIATIONS
ISODOSE CURVES
MATERIALS
MOCKUP
MUSCLES
OXYGEN COMPOUNDS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIATIONS
STANDARDS
STRUCTURAL MODELS
TISSUE-EQUIVALENT MATERIALS
WATER
X RADIATION
X-RAY DOSIMETRY