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Photoscanning; Photo-exploration; Fotoissledovanie; Fotoexploracion

Abstract

Isotope scanning permits the non-traumatic localization of several types of human tumors. To obtain satisfactory visualization, a scanner must be capable of resolving small differences in isotope content between target and non-target tissues and presenting this data in a readily interpretable form. In addition, it must have sufficient flexibility to be adaptable to the variety of activity levels and target : non-target ratios encountered clinically. Since for the most part isotope scanning is a diagnostic screening procedure, the overall counting efficiency must be high so that the administered radioactivity can be kept as low as possible. A scanner meeting these needs has been constructed. The data presentation system, based upon the marked voltage dependence of the light output of a tungsten filament provides the high contrast necessary for visualizing small changes in count rate. It is possible to adjust the contrast and gain of the recording system to match the clinical requirements. A focusing collimator and large Nal crystal provide high efficiency, good resolution, and adequate depth response. This instrument has been successfully used for the localization of human tumors of the brain, liver, and thyroid. (author) [French] L'exploration par les isotopes permet de localiser sans traumatisme differents types de  More>>
Authors:
Bender, M A; Blau, M [1] 
  1. Department of Radioisotope Research, Roswell Park Memorial Institute, Buffalo, NY (United States)
Publication Date:
Jul 01, 1959
Product Type:
Conference
Resource Relation:
Conference: Seminar on Medical Radioisotope Scanning, Vienna (Austria), 25-27 Feb 1959; Other Information: 10 figs, 4 refs; Related Information: In: Medical Radioisotope Scanning. Proceedings of a Seminar| 278 p.
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ACTIVITY LEVELS; BRAIN; CRYSTALS; EFFICIENCY; FILAMENTS; FLEXIBILITY; HUMAN POPULATIONS; LIVER; MEETINGS; NEOPLASMS; RADIOACTIVITY; RECORDING SYSTEMS; TUNGSTEN
OSTI ID:
22025596
Research Organizations:
International Atomic Energy Agency, Vienna (Austria); World Health Organization, Geneva (Switzerland)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA12N1542112889
Submitting Site:
INIS
Size:
page(s) 31-38
Announcement Date:
Jan 17, 2013

Citation Formats

Bender, M A, and Blau, M. Photoscanning; Photo-exploration; Fotoissledovanie; Fotoexploracion. IAEA: N. p., 1959. Web.
Bender, M A, & Blau, M. Photoscanning; Photo-exploration; Fotoissledovanie; Fotoexploracion. IAEA.
Bender, M A, and Blau, M. 1959. "Photoscanning; Photo-exploration; Fotoissledovanie; Fotoexploracion." IAEA.
@misc{etde_22025596,
title = {Photoscanning; Photo-exploration; Fotoissledovanie; Fotoexploracion}
author = {Bender, M A, and Blau, M}
abstractNote = {Isotope scanning permits the non-traumatic localization of several types of human tumors. To obtain satisfactory visualization, a scanner must be capable of resolving small differences in isotope content between target and non-target tissues and presenting this data in a readily interpretable form. In addition, it must have sufficient flexibility to be adaptable to the variety of activity levels and target : non-target ratios encountered clinically. Since for the most part isotope scanning is a diagnostic screening procedure, the overall counting efficiency must be high so that the administered radioactivity can be kept as low as possible. A scanner meeting these needs has been constructed. The data presentation system, based upon the marked voltage dependence of the light output of a tungsten filament provides the high contrast necessary for visualizing small changes in count rate. It is possible to adjust the contrast and gain of the recording system to match the clinical requirements. A focusing collimator and large Nal crystal provide high efficiency, good resolution, and adequate depth response. This instrument has been successfully used for the localization of human tumors of the brain, liver, and thyroid. (author) [French] L'exploration par les isotopes permet de localiser sans traumatisme differents types de tumeurs humaines. Pour assurer une representation graphique satisfaisante, un dispositif de detection doit pouvoir resoudre les petites differences de teneur en isotopes entre les tissus directement vises et les autres, et presenter ces donnees sous une forme facile a interpreter. En outre, il doit pouvoir s'adapter a des niveaux de radioactivite divers et a des differences marquees dans les rapports entre zone visee et zone environnante, tels qu'on les rencontre dans les recherches cliniques. Etant donne que, dans la plupart des cas, l'exploration par isotopes est une methode de depistage clinique, l'efficacite totale du comptage doit atteindre un degre eleve pour que les doses d'irradiation puissent etre maintenues a un niveau aussi bas que possible. Un dispositif de detection repondant a ces conditions a ete construit. Le systeme de presentation des donnees, fonde sur les variations marquees, en fonction de la tension, de l'intensite de la lumiere emise par un filament de tungstene, permet d'obtenir le fort contraste necessaire pour faire apparaitre des changements meme minimes du taux de comptage. Il est possible de regler le contraste et le gain du systeme d'enregistremen t pour repondre aux exigences cliniques. Un collimateur de mise au point et un cristal d'iodure de sodium de grande dimension assurent une haute efficacite, une bonne resolution et une sensibilite suffisante en profondeur. Cet instrument a ete utilise avec succes pour localiser des tumeurs humaines du cerveau, du foie et de la thyroide. (author) [Spanish] La exploracion mediante radioisotopos permite localizar sin traumatismo distintos tipos de tumores humanos. Para lograr una representation visual satisfactoria, el detector debe poder resolver pequenas diferencias en la concentracion de los isotopos existentes entre los tejidos enfocados y los circundantes, y presentar estos datos en forma facilmente interpretable. Ademas, debe poseer la flexibilidad suficiente para poder adaptarse a los distintos grados de actividad y a las diferencias considerables en las razones de tejidos enfocados a circundantes, que suelen encontrarse en la practica medica. Dado que en la mayor parte de los casos, la exploracion por isotopos representa un metodo de seleccion diagnostica, la eficiencia global del recuento debe ser alta, a fin de que se reduzcan al minimo posible las dosis de radiacion aplicadas. Se ha construido un detector que reune estos requisitos. El sistema de presentacion de datos, basado en las marcadas variaciones que la intensidad de la luz emitida por un filamento de tungsteno experimenta en funcion de la tension, permite obtener el fuerte contraste necesario para poder observar pequenos cambios en el indice de recuento. Existe la posibilidad de graduar el contraste y la ganancia del sistema de registro con arreglo a las necesidades clinicas. Un colimador de enfoque y un cristal de yoduro sodico de gran tamano proporcionan una elevada eficiencia, una resolucion satisfactoria y una sensibilidad adecuada en profundidad. Este instrumenta se ha utilizado con exito para la deteccion de tumores humanos en el cerebro, el higado y la tiroides. (author) [Russian] Issledovanie metodom izotopov pozvolyaet bez nane geniya travmy ustanavlivat' mestonakhozhdenie nekotorykh vidov opukholej v organizme cheloveka. Dlya polucheniya udovletvoritel'nogo graficheskogo izobrazheniya detektor dolzhen byt' v sostoyanii opredelyat' nebol'shie razlichiya mezhdu soderzhanii izotopov v zatronutoj i okruzhayushchej tkani, a takzhe registrirovat' ehti dannye v legko ponyatnoj forme. Krome togo, on dolzhen byt' dostatochno chuvstvitel'nym, chtoby mozhno bylo ego prisposoblyat' k razlichnym vstrechayushchimsya na praktike urovnyam radioaktivnosti i sushchestvuyushchim sootnosheniyam mezhdu bol'noj i okruzhayushchej tkan'yu. Tak kak izsledovanie s pomoshch'yu radioizotopov yavlyaetsya v osnovnom registratsionny m metodom diagnoza, obshchij koehffitsient ehffektivnosti schetchika dolzhen byt' dostatochno vysokim, chtoby vvodimaya radioaktivnost' ne prevyshala po vozmozhnosti minimal'nogo urovnya. Dlya ehtoj tseli byl skonstruirovan sootvetstvuyushchi j detektor. Sistema zapisi, osnovannaya na tom, chto napryazhenie v znachitel'noj mere otrazhaetsya na intensivnosti sveta, proizvodimogo vol'framovoj nit'yu, obespechivaet tot vysokij kontrast, kotoryj neobkhodim dlya ustanovleniya malejshikh izmenenij v skorosti scheta. EHtot kontrast i moshchnost' zapisyvayushchej sistemy mozhno regulirovat' i ehtim udovletvoryat' klinicheskim trebovaniyam. Fokusiruyushchi j kollimator i bol'shoj kristall iodistogo natriya (Nal) obespechivayut vysokuyu ehffektivnost', khoroshuyu razreshayushchuyu sposobnost' i sootvetstvuyushchu yu chuvstvitel'nost'. Dannyj pribor byl s uspekhom ispol'zovan dlya lokalizatsii opukholej mozga, pecheni i shchitovidnoj zhelezy. (author)}
place = {IAEA}
year = {1959}
month = {Jul}
}