Radiation techniques for head and neck tumors. 2000

K Bratengeier, and L Pfreundner, and M Flentje
Department of Radiation Oncology, University of Wuerzburg, Josef-Schneider-Strasse 11, D-97080 Wuerzburg, Germany.

OBJECTIVE A technique that combines some advantages of conforming techniques for advanced oro- and hypopharyngeal carcinomas is proposed. The aim is to increase the dose homogeneity in the target volume relative to lateral opposed fields. METHODS This publication compares conforming radiation techniques based on standard equipment, standard linear accelerator setup and commercially available planning software with lateral opposed fields. More advanced conformal techniques reported in the literature are taken into account in a semi-quantitative manner. Our standard method uses an arc rotation, sparing the spinal cord. In contrast to earlier methods of this type, the resulting dose deficit in the vicinity of the spine is compensated by static lateral wedged fields. Dose distributions for 25 consecutive patients were planned. RESULTS The conforming techniques were found to produce more homogeneous dose distributions than lateral opposed fields. In the planning target volume (PTV) (mean: 940 cm(3)) a standard deviation of dose of 4.6% was achieved. Ninety-five percent of the PTV were enclosed by the 90% isodose. The maximal spinal cord dose was limited to 45 Gy. The dose distributions of these techniques could compete with literature data on advanced techniques (the published dose-volume histogram (DVHs) of PTVs were evaluated). At the linear accelerator time for realization took 14 min on average. The planning time is 1-4 h (mean: less than 2 h). CONCLUSIONS A rotational technique applicable with standard equipment is presented. Dose coverage of target volumes is improved, while the spinal cord is spared.

UI MeSH Term Description Entries
D007012 Hypopharyngeal Neoplasms Tumors or cancer of the HYPOPHARYNX. Hypopharyngeal Cancer,Neoplasms, Hypopharyngeal,Cancer, Hypopharyngeal,Cancers, Hypopharyngeal,Hypopharyngeal Cancers,Hypopharyngeal Neoplasm,Neoplasm, Hypopharyngeal
D008297 Male Males
D009362 Neoplasm Metastasis The transfer of a neoplasm from one organ or part of the body to another remote from the primary site. Metastase,Metastasis,Metastases, Neoplasm,Metastasis, Neoplasm,Neoplasm Metastases,Metastases
D009959 Oropharyngeal Neoplasms Tumors or cancer of the OROPHARYNX. Cancer of Oropharnyx,Oropharyngeal Cancer,Cancer of the Oropharynx,Neoplasms, Oropharyngeal,Oropharynx Cancer,Oropharynx Neoplasms,Cancer, Oropharyngeal,Cancer, Oropharynx,Cancers, Oropharyngeal,Cancers, Oropharynx,Neoplasm, Oropharyngeal,Neoplasm, Oropharynx,Neoplasms, Oropharynx,Oropharnyx Cancer,Oropharnyx Cancers,Oropharyngeal Cancers,Oropharyngeal Neoplasm,Oropharynx Cancers,Oropharynx Neoplasm
D011879 Radiotherapy Dosage The total amount of radiation absorbed by tissues as a result of radiotherapy. Dosage, Radiotherapy,Dosages, Radiotherapy,Radiotherapy Dosages
D011880 Radiotherapy Planning, Computer-Assisted Computer-assisted mathematical calculations of beam angles, intensities of radiation, and duration of irradiation in radiotherapy. Computer-Assisted Radiotherapy Planning,Dosimetry Calculations, Computer-Assisted,Planning, Computer-Assisted Radiotherapy,Calculation, Computer-Assisted Dosimetry,Calculations, Computer-Assisted Dosimetry,Computer Assisted Radiotherapy Planning,Computer-Assisted Dosimetry Calculation,Computer-Assisted Dosimetry Calculations,Dosimetry Calculation, Computer-Assisted,Dosimetry Calculations, Computer Assisted,Planning, Computer Assisted Radiotherapy,Radiotherapy Planning, Computer Assisted
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012680 Sensitivity and Specificity Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed) Specificity,Sensitivity,Specificity and Sensitivity
D012720 Severity of Illness Index Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder. Illness Index Severities,Illness Index Severity

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