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Author Lajoie, W. N.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword RADIOLOGY AND NUCLEAR MEDICINE ♦ MAMMARY GLANDS ♦ NEOPLASMS ♦ RADIOTHERAPY ♦ FEMALES ♦ PLANNING ♦ RADIATION DOSES ♦ BODY ♦ DISEASES ♦ DOSES ♦ GLANDS ♦ MEDICINE ♦ NUCLEAR MEDICINE ♦ ORGANS ♦ RADIOLOGY ♦ THERAPY ♦ Medicine- External Radiation in Therapy- (1980-)
Abstract Significant dose inhomogeneities may exist between the supraclavicular fossa (SCF) and the internal mammary chain (IMC) regions in the irregular L-shaped (hockey stick) field associated with breast cancer treatments. This dose inhomogeneity exists, in part, because of a positive air gap in the SCF and a negative air gap in the IMC locations. Independent of treatment technique, (i.e., whether anterior-posterior (AP) or oblique fields are used), accurate source-to-skin distance (SSD) values for the SCF, IMC, and axilla are necessary when doing an irregular field (Clarkson) dose calculation. However, when an oblique technique is used to treat the hockey stick field, obtaining non-central-axis SSDs is not as straightforward as when an AP technique is employed. The Mayo Off-axis Distance Indicator was constructed to slide into the blocking tray slot of the simulator or treatment machine. This mechanical measuring device provides quick and accurate SSD measurements for non-central-axis points under either AP or, more importantly, oblique treatment conditions.
ISSN 07390211
Educational Use Research
Learning Resource Type Article
Publisher Date 1988-09-01
Publisher Place United States
Journal Medical Dosimetry
Volume Number 13
Issue Number 3


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