RESUMEN
The purpose of this report is to study the feasibility of improving dose distributions using non-coplanar photon beams from a linear accelerator. Non-coplanar beams may enter the patient in any arbitrary configuration. This type of treatment technique requires a three-dimensional (3-D) planning system. Clinical examples are used to illustrate the general problems in 3-D treatment planning, and the potential improvement over coplanar beam treatments. Features of a treatment planning system for 3-D planning are discussed.
Asunto(s)
Dosificación Radioterapéutica/instrumentación , Neoplasias Encefálicas/radioterapia , Neoplasias de la Mama/radioterapia , Computadores , Femenino , Humanos , Glándula Pineal , Neoplasias Hipofisarias/radioterapia , Radiación , Tomografía Computarizada por Rayos XAsunto(s)
Protección Radiológica/métodos , Dosimetría Termoluminiscente , Neutrones Rápidos/efectos adversos , Fluorescencia , Humanos , Microondas/efectos adversos , Dosis de Radiación/instrumentación , Dosis de Radiación/métodos , Protección Radiológica/instrumentación , Dosificación Radioterapéutica/instrumentación , Dosificación Radioterapéutica/métodosRESUMEN
Requirements for clinical dosimetry procedures are derived from the radiotherapeutical necessities especially for the exceptionally suitable thermoluminescence dosimetry. With regard to the following papers discussing problems of the ambitious two-peak TLD method typical features of this method are compared with those of the classical method, respectively.
Asunto(s)
Dosificación Radioterapéutica/instrumentación , Dosimetría Termoluminiscente/normas , Calibración , Estudios de Evaluación como Asunto , Neutrones Rápidos/efectos adversos , Humanos , Protección Radiológica , Dosificación Radioterapéutica/métodosRESUMEN
The clinical applications of continuous cylindrical TL dosemeters, readout by linear motion through a heated oven, are presented in this work. The applications extend over high energy electron and photon therapy as well as diagnostic X-ray radiology.
Asunto(s)
Protección Radiológica/métodos , Radiografía/instrumentación , Dosificación Radioterapéutica/instrumentación , Dosimetría Termoluminiscente/instrumentación , Braquiterapia/efectos adversos , Braquiterapia/instrumentación , Calibración , Neutrones Rápidos/efectos adversos , Humanos , Neoplasias/radioterapia , Dosis de Radiación , Radiografía/métodos , Dosificación Radioterapéutica/métodosRESUMEN
Dose distribution in mantle fields irradiated with 18 MeV photons has been studied in an Alderson-Rando phantom with thermoluminescent dosimeters. The treatment was also simulated on an RT-plan 7000 computer; calculated and measured doses in anatomical sites of major interest were compared. Doses in all significant points were within +/- 7% of the doses at the reference point. Calculated and measured doses agreed within +/- 5% except points situated near unhomogeneous tissues. The authors discuss their results and present conclusions about algorithms for computer dose calculation in irregular field treatments.
Asunto(s)
Enfermedad de Hodgkin/radioterapia , Dosificación Radioterapéutica/instrumentación , Radioterapia de Alta Energía , Dosimetría Termoluminiscente/métodos , Computadores , HumanosRESUMEN
In-vivo-dosimetry is necessary to prevent overdosage during radiation treatment techniques of great risk. New special dosemeter probes with up to five Si-pn-junction-diodes in a silicone tube were developed and tested for endodosimetry. They show high efficiency and good linearity of response, without dose-rate dependence. The steep increase of the sensitivity for low energies causes a phantom depth dependence of response. A low temperature dependence but a large anisotropy of response is found for the tested diodes. These multidetector probes proved to be sufficient for direct reading endodosimetric control of dose and dose-distribution during radiotherapy.
Asunto(s)
Braquiterapia/instrumentación , Dosificación Radioterapéutica/instrumentación , Femenino , Humanos , Semiconductores , SilicioRESUMEN
The authors describe the equipment and methods of calculation used for a system of automatic conversational dosimetry with a mini-computer. They present the dialogue of the physician with the calculator and indicate the conditions they required of such a system: i.e. rapidity of response, simplicity of use, verification of data, precision, adaptability. Testing involved 800 dosimetric cases including 300 cases of routine clinical dosimetry.