Eye sparing in high energy X ray beams. 1985

D M Galbraith, and H Aget, and P M Leung, and W D Rider

Treatment of cancer of the antrum and nasopharynx often includes the radiation of tissues close to an uninvolved eye. One treatment method consists of using an anterior high energy X ray beam directed to the tumor through the eye. To maintain a high dose adjacent to and behind the eye while reducing the entrance dose to the eye, build-up material is placed on the skin and a tunnel cut through to the eye. When the build-up material is tissue-like, the tunnel can be several centimeters in height and scattered radiation from the tunnel walls will largely offset the build-up properties of the beam. Using higher density build-up material, the dose to the superficial layers of the eye can be reduced almost to the limit set by the open beam characteristics. This technique has been used successfully for 8 years.

UI MeSH Term Description Entries
D008444 Maxillary Sinus Neoplasms Tumors or cancer of the MAXILLARY SINUS. They represent the majority of paranasal neoplasms. Cancer of Maxillary Sinus,Maxillary Sinus Cancer,Neoplasms, Maxillary Sinus,Cancer, Maxillary Sinus,Cancers, Maxillary Sinus,Maxillary Sinus Cancers,Maxillary Sinus Neoplasm,Neoplasm, Maxillary Sinus
D009303 Nasopharyngeal Neoplasms Tumors or cancer of the NASOPHARYNX. Cancer of Nasopharynx,Nasopharyngeal Cancer,Cancer of the Nasopharynx,Nasopharynx Cancer,Nasopharynx Neoplasms,Neoplasms, Nasopharyngeal,Cancer, Nasopharyngeal,Cancer, Nasopharynx,Cancers, Nasopharyngeal,Cancers, Nasopharynx,Nasopharyngeal Cancers,Nasopharyngeal Neoplasm,Nasopharynx Cancers,Nasopharynx Neoplasm,Neoplasm, Nasopharyngeal,Neoplasm, Nasopharynx,Neoplasms, Nasopharynx
D010255 Paranasal Sinus Neoplasms Tumors or cancer of the PARANASAL SINUSES. Cancer of Paranasal Sinus,Neoplasms, Paranasal Sinus,Paranasal Sinus Cancer,Cancer, Paranasal Sinus,Cancers, Paranasal Sinus,Neoplasm, Paranasal Sinus,Paranasal Sinus Cancers,Paranasal Sinus Neoplasm
D011835 Radiation Protection Methods and practices adopted to protect against RADIATION. Protection, Radiation
D011882 Radiotherapy, High-Energy Radiotherapy using high-energy (megavolt or higher) ionizing radiation. Types of radiation include gamma rays, produced by a radioisotope within a teletherapy unit; x-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutrons and pi-mesons (pions), produced as secondary particles following bombardment of a target with a primary particle. Megavolt Radiotherapy,High-Energy Radiotherapy,Radiotherapy, Megavolt,High Energy Radiotherapy,Radiotherapy, High Energy
D005123 Eye The organ of sight constituting a pair of globular organs made up of a three-layered roughly spherical structure specialized for receiving and responding to light. Eyes
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man

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