摘要:
Described are various methods for validating a patient's radiotherapy plan. One possible method comprises receiving a dose distribution at a dosimetry service, receiving dose data at the dosimetry service from a radiation detection device at a treatment site removed from the dosimetry service, the data having been gathered in accordance with the dose distribution, and evaluating the dose data in comparison to the dose distribution to prepare a validation report.
摘要:
This invention relates to a mixture of imageable polyacetylenic compounds which have similar photosensitivities and which are visually imageable in complementary colors combinable to provide a black image, which mixture contains at least one polyacetylenic metal salt which produces a color, preferably a metal salt of a diacetylene C6 to C48 mono- or dicarboxylic acid, which is complementary to a color produced by another polyacetylenic metal salt or non-metallic polyacetylenic compound contained in the mixture or in an another integral color forming layer. The invention also pertains to the use of said mixture and the manner of its preparation.
摘要:
A method for determining a level of exposure to radiation utilizes a radiation dosimeter comprising a substrate provided with a radiation sensitive layer or patch having an optical density which varies in accordance with the degree of radiation exposure. In addition, the substrate is provided with optically readable coding which identifies encoded mathematical parameters for enabling an automated calculation of dosage from a detected post-exposure optical density of the radiation sensitive material. The method comprises the step of optically measuring the optical density of the layer of radiation sensitive material prior to exposure thereof to radiation. In addition, the coding on the dosimeter substrate is scanned to automatically determine the encoded mathematical parameters. The method further comprises the steps of exposing the radiation sensitive layer to radiation and optically measuring a post-exposure optical density of the layer of radiation sensitive material. Subsequently, from the pre-exposure optical density, the post-exposure optical density, and the mathematical parameters and in accordance with a predetermined mathematical algorithm, a quantitative radiation dose to which the layer of radiation sensitive material was exposed is automatically computed. Preferably, the computed quantitative radiation dose is automatically indicated on a display. Each dosimeter may be provided with a unique identification code encoded in the bar coding on the dosimeter substrate, to enable memory storage of pre-exposure optical densities for multiple dosimeters. A look-up table may be stored in memory for enabling correction of computed optical densities where the post-exposure densities are measured at different times intervals after exposure.
摘要:
This invention relates to a process for the recovery of a substantially insoluble, radiation imageable polyacetylene dispersion in aqueous binder which comprises contacting the dispersion with a proteolylic enzyme in an amount sufficient to decompose the binder, at a pH of from about 3 to about 9 and a temperature of between about 20.degree. C. and about 70.degree. C. and separating polyacetylene solids from the resulting liquid mixture, and which solids can be solubilized and recrystallized for further use.
摘要:
The invention relates to a polyacetylenic recording film of improved resistance to degradation by UV light and increased sensitivity to ionizing radiation and to the process for producing said film which comprises dissolving polyacetylenic imaging crystals in n-butanol before forming a dispersion in a binder material and before coating on a polyester film base.
摘要:
The invention relates to a light stabilizing and antioxidant coating for polyacetylenic recording media which comprises an aqueous composition of ascorbic acid, gelatin and less than 2% by weight of surfactant wherein the mole ratio of acid to gelatin is between about 1:1 and about 10:1 dissolved in from about 35 wt. % to about 80 wt. % of water.
摘要:
An aromatic ketone having the formula XArCOPhPhOH is made by contacting an ester of formula XArCOOPhPh, whereAr is a divalent mono- or poly - aromatic group which may optionally be substituted;Ph is para-phenylene; andX is hydrogen or halogen or a nitro-, alkylsulphonyl-, arylsulphonyl-, alkylcarbonyl- or hydrocarbon groupwith a Friedel Crafts catalyst comprising one or more Lewis acids in an amount of at least 2.2 moles of such catalyst for each mole of the ester.
摘要:
A mixture of isomers of fluoro-4'-hydroxybenzophenone are dissolved in an aqueous solution of a base, for example sodium hydroxide, and sufficient acid is added to reduce the pH to not less than 9 and to precipitate 4-fluoro-4'-hydroxybenzophenone having a reduced proportion of other isomers.
摘要:
In a method for manufacturing a calibrated radiation dosimeter, a layer of radiation sensitive material is applied to a substrate, the radiation sensitive material having an optical density which varies in accordance with a degree of radiation exposure. A pre-exposure optical density of the layer of radiation sensitive material is optically measured and subsequently the layer of radiation sensitive material is exposed to a known dose of radiation. Thereafter, a post-exposure optical density of the layer of radiation sensitive material is optically measured. Using at least the pre-exposure optical density, the post-exposure optical density, and the known dose of radiation, one computes mathematical parameters defining a predetermined mathematical function. The computed mathematical parameters are applied in encoded form to the substrate (e.g., printed in bar code form on the substrate or a holder card).