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Analysis of Scan Records with a Recording Densitometer - The ''Re-Scanner''; Etude d'un Grand Collimateur a Focalisation et Fort Pouvoir de Resolution: Resultats; Analiz skenogramm s pomoshch'yu registriruyushchego densitometra - ''re-skenner''; Diseno y Funcionamiento de un Gran Colimador Enfocado de Alto Poder de Resolucion

Abstract

The impact of improvements in scanning equipment has not been fully felt at the clinical level, largely because of deficiencies in scan recording. In an attempt to improve visualization and contrast in scan records, various instrumental methods of analysis have been devised. We have devised a simple and comparatively inexpensive recording densitometer for ''re-scanning'' scan records. A light-sensor scans the record just as a scanner scans a patient. The output of the device is a pulse rate proportional to the opacity (or transmission) of the record, and may be used to make a new, or ''re-scan'', record. The area of the record over which information is integrated is set by sensor aperture. The wide range of output pulse-rates (zero to 15 000 parts/s) causes large and adjustable contrast amplification. A threshold control provides any ''cut-off level'' of choice. Operation is rapid, and a record can be re-scanned in a small fraction of the time required to obtain the original record. Studies on clinical scans of almost every organ or area of interest show that the re-scanner reveals information not at first evident in original scan records. It has been particularly useful in determining the statistical significance of small variations in  More>>
Authors:
Harris, C. C.; Bell, P. R.; Satterfield, M. M.; Ross, D. A.; Jordan, J. C. [1] 
  1. Oak Ridge National Laboratory, TN (United States)
Publication Date:
Oct 15, 1964
Product Type:
Conference
Report Number:
IAEA-SM-51/66
Resource Relation:
Conference: Symposium on medical radioisotope scanning, Athens (Greece), 20-24 Apr 1964; Other Information: 6 refs., 9 figs.; Related Information: In: Medical Radioisotope Scanning. Vol. I. Proceedings of the Symposium on Medical Radioisotope Scanning| 574 p.
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; APERTURES; COUNTING RATES; DENSITOMETERS; DENSITY; NUCLEAR MEDICINE; OPACITY; PATIENTS; RADIOISOTOPE SCANNING; SENSORS
OSTI ID:
22127655
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M3068082734
Submitting Site:
INIS
Size:
page(s) 529-541
Announcement Date:
Sep 12, 2013

Citation Formats

Harris, C. C., Bell, P. R., Satterfield, M. M., Ross, D. A., and Jordan, J. C. Analysis of Scan Records with a Recording Densitometer - The ''Re-Scanner''; Etude d'un Grand Collimateur a Focalisation et Fort Pouvoir de Resolution: Resultats; Analiz skenogramm s pomoshch'yu registriruyushchego densitometra - ''re-skenner''; Diseno y Funcionamiento de un Gran Colimador Enfocado de Alto Poder de Resolucion. IAEA: N. p., 1964. Web.
Harris, C. C., Bell, P. R., Satterfield, M. M., Ross, D. A., & Jordan, J. C. Analysis of Scan Records with a Recording Densitometer - The ''Re-Scanner''; Etude d'un Grand Collimateur a Focalisation et Fort Pouvoir de Resolution: Resultats; Analiz skenogramm s pomoshch'yu registriruyushchego densitometra - ''re-skenner''; Diseno y Funcionamiento de un Gran Colimador Enfocado de Alto Poder de Resolucion. IAEA.
Harris, C. C., Bell, P. R., Satterfield, M. M., Ross, D. A., and Jordan, J. C. 1964. "Analysis of Scan Records with a Recording Densitometer - The ''Re-Scanner''; Etude d'un Grand Collimateur a Focalisation et Fort Pouvoir de Resolution: Resultats; Analiz skenogramm s pomoshch'yu registriruyushchego densitometra - ''re-skenner''; Diseno y Funcionamiento de un Gran Colimador Enfocado de Alto Poder de Resolucion." IAEA.
@misc{etde_22127655,
title = {Analysis of Scan Records with a Recording Densitometer - The ''Re-Scanner''; Etude d'un Grand Collimateur a Focalisation et Fort Pouvoir de Resolution: Resultats; Analiz skenogramm s pomoshch'yu registriruyushchego densitometra - ''re-skenner''; Diseno y Funcionamiento de un Gran Colimador Enfocado de Alto Poder de Resolucion}
author = {Harris, C. C., Bell, P. R., Satterfield, M. M., Ross, D. A., and Jordan, J. C.}
abstractNote = {The impact of improvements in scanning equipment has not been fully felt at the clinical level, largely because of deficiencies in scan recording. In an attempt to improve visualization and contrast in scan records, various instrumental methods of analysis have been devised. We have devised a simple and comparatively inexpensive recording densitometer for ''re-scanning'' scan records. A light-sensor scans the record just as a scanner scans a patient. The output of the device is a pulse rate proportional to the opacity (or transmission) of the record, and may be used to make a new, or ''re-scan'', record. The area of the record over which information is integrated is set by sensor aperture. The wide range of output pulse-rates (zero to 15 000 parts/s) causes large and adjustable contrast amplification. A threshold control provides any ''cut-off level'' of choice. Operation is rapid, and a record can be re-scanned in a small fraction of the time required to obtain the original record. Studies on clinical scans of almost every organ or area of interest show that the re-scanner reveals information not at first evident in original scan records. It has been particularly useful in determining the statistical significance of small variations in counting rate in a scan record. In scan records of large dynamic range where no single cut-off level satisfactorily shows all regions of interest, re-scans at several cut-off levels were once necessary. A two-region sensor, that views a region of the record around the field of view of the main sensor, has been used in an attempt to overcome this difficulty. At least three modes of operation are possible with the two-region sensor: (1) ''normal'' operation; (2) ignoring general record density and responding only to small variations, thus setting its own cut-off level; and (3) reporting only abrupt changes in record density. Other modes seem to be possible. This relatively simple and inexpensive device is proving to be of valuable assistance in the interpretation of scan records. (author) [French] U s perfectionnements des appareils de scintigraphie n'ont pas eu d'effet comparable sur le plan clinique, surtout en raison des imperfections des enregistrements scintigraphiques. En vue d'ameliorer la visualisation et le contraste des scintigrammes, on a mis au point divers appareils d'analyse. Les auteurs ont concu un densitometre enregistreur, assez simple et relativement peu couteux, qui permet de 'scintigraphier' les scintigrammes. Une cellule photoelectrique explore le scintigramme, tout comme un detecteur ascintillation explore le patient. Les impulsions a la sortie de l'appareil sont proportionnelles a la densite du scintigramme et elles peuvent etre utilisees pour etablir un nouvel enregistrement. La surface du scintigramme pour laquelle on integre les informations est determinee par l'ouverture de la c ellule . La gamme etendue des impulsions a la sortie (de zero a 15 000 impulsions/s) permet d'amplifier fortement et a volonte le contraste. Un dispositif special permet de choisir a l'avance un ' seuil de coupure' L'operation est rapide, si bien qu'un scintigramme peut etre explore en une fraction du temps qui avait ete necessaire pour l'etablir. L*etude de scintigrammes cliniques de presque tous les organes ou regions interessants a permis de constater que le densitometre enregistreur revele des informations qui n'apparaissaient pas clairement sur le scintigramme. Cet appareil a ete particulierement utile pour determiner la signification statistique de legeres variations du taux de comptage dans un scintigramme. Pour les scintigrammes representant de fortes variations de la radioactivite, ou un seul seuil de coupure du densitometre ne donne pas une image satisfaisante de toutes les zones interessantes, il fallait autrefois faire plusieurs explorations avec differents seuils de coupure. Pour surmonter cette difficulte, on a eu recours a une c ellule a deux plages qui explore le scintigramme autour du champ de vision de la c ellule principale. On peut l 'utiliser d'au moins trois manieres: a) normalement; b) sans tenir compte de la densite generale du sci ntigramme, pour n 'accuser que de faibles variations de la densite (en fixant alors son propre seuil de coupure); c) pour n'enregistrer que de brusques variations de la densite du scintigramme. Il semble que d'autres modes d'utilisation soient egalement possibles. Cet appareil, relativement simple et peu couteux, se revele extremement utile pour l'interpretation des scintigrammes. (author) [Spanish] El perfeccionamiento de los aparatos de centelleografia no ha repercutido como debiera en los estudios clinicos debido, en gran parte, a las deficiencias de los centelleogramas. Para mejorar la visualizacion y acentuar el contraste se han estudiado diversos metodos instrumentales de analisis. Los autores han ideado un densitometro registrador sencillo y poco costoso para 'reexplorar' centelleogramas. Un elemento fotosensible analiza el centelleograma de la misma manera que el detector explora al paciente. Ese elemento responde con impulsos de frecuencia proporcional a la opacidad (o capacidad de transmision) del registro y puede utilizarse para hacer otro nuevo (registro de ' reexploracion'). El area del registro respecto a la cual se integra la informacion, se determina fijando la apertura del elemento fotosensible. El amplio margen de la frecuencia de los impulsos de salida (entre 0 y 15 000 impulsos/s) da lugar a un gran aumento del contraste, que es posible graduar. Un regulador de umbral permite preseleccionar cualquier ' nivel de corte' . La operacion es rapida y es posible reexplorar un registro en una pequena fraccion del tiempo que se necesito para obtenerlo. El estudio de centelleogramas clinicos de casi todos los organos o zonas de interes maestra que la reexploracion proporciona datos que no eran evidentes en los centelleogramas originales. Ese metodo resulta especialmente util para determinar la significacion estadistica de pequenas variaciones del fndice de recuento en un centelleograma. Con los centelleogramas de intervalo dinamico muy amplio, en los que un solo nivel de corte no revela todas las regiones de interes, era preciso anteriormente trabajar a diversos niveles. Para allanar esta dificultad, los autores han tratado de emplear un elemento fotosensible bizonal que analiza una region del centelleograma situada alrededor del campo de vision del elemento principal. Este dispositivo se puede emplear, por l'o menos, de tres maneras diferentes: a) de manera ' n o rm a l' ; b) prescindiendo de la densidad general del registro y respondiendo solamente a pequenas variaciones, fijando asi su propio nivel de corte; c) indicando solamente cambios bruscos de densidad. Tambien parecen posibles otros procedimientos de empleo. Ese dispositivo relativamente sencillo y poco costoso es sumamente util para la interpretacion de centelleogramas. (author) [Russian] Vlijanie usovershenstvovanij v skennirujushhem oborudovanii ne chuvstvovalos' polnost'ju na klinicheskom urovne v znachitel'noj mere vvidu nedostatkov registracii skenn ogram m. Dlja uluchshenija izobrazhenija i kontrastnosti pri skenniorovanii byli razrabotany razlichnye instrumental'nye metody analiza. Avtory sozdali prostoj i sravnitel'no nedorogostojashhij registrirujushhij densitometr dlja ''povtornogo skennirovanija'' skennogramm. Legkij chuvstvitel'nyj jelement skenniruet diagrammu tochno t akzhe, kak skenner pacienta. Moshhnost' ustrojstv a javljaetsja ravnoj kojefficientu impul'sa, proporcional'nomu neprozrachnosti (ili peredache) izobrazhenija i mozhet i sp ol' zov at' sja dlja togo, chtoby sdelat' novoe ili ''reskennirovannoe'' i zobrazhenie. Ploshhad' diagrammy, s kotoroj obobshhaetsja informacija, ustanavlivaetsja otverstiem, snabzhennym chuvstvitel'nym jelementom. Shirokij diapazon kojefficientov moshhnosti impul'sov (ot 0 do 15 000 impul'sov v sekundu) vyzyvaet znachitel'noe i reguliroemoe uvelichenie kontrastnosti. Porogovyj kontrol' d a et ljuboj ''sokrashhennyj uroven'' vybora. Rabota provoditsja bystro, i diagramma mozhet byt' reskennirovana v techenie nebol'shogo promezhutka vremeni, neobhodim ogo dlja poluchenija pervonachal'nogo izobrazhenija. Issledovanija v oblasti klinicheskogo skennirovanija pochti ljubogo organa ili rajona., predstavljajushhego interes, pokazyvajut, chto rerazvertyvatel' daet informaciju, ne vidimuju snachala na di agram mah pri pervonachal'nom skennirovanii. Jeto bylo osobenno poleznym pri opredelenii st atisticheskogo znachenija nebol'shih izmenenij v kojefficiente scheta pri skennirujushhem izobrazhenii. . Pri diagrammah, poluchennyh metodom skennirovanija, bol'shogo dinamicheskogo diapazo n a , gle nikakoj otdel'nyj sokrashhennyj urov en' udovletv orit el'no ne pokazy vaet vse rajony, predstavljajushhie interes, vnov' byli neobhodimy rerazvertyvateli na nekotoryh sokrashhennyh urovnjah. V popytke preodolet' je t u trudnost' ispol'zovalsja dvuhdiapazonnyj chuvstvitel'nyj jel em en t , kotoryj ohvatyvaet rajon registracii vokrug o bl a sti nabljudenija glavnogo chuvstvitel'nogo jel em en t a . Po krajnej m er e , vozmozhny tri vida jek s pluatacii pribora s dvuhdiapazonnym chuvstvitel'nym jelemen tom: 1) ''normal'naja'' je k s pluatacija; 2) ignorirovanie obshhej plotnosti izobrazhenija i reakcija tol'ko na nebol'shie izmenenija, ustanavlivaja takim obrazom svoj sobstvennyj sokrashhennyj uroven'; 3) soobshhenie tol'ko o vnezapnyh izmenenijah v plotnosti registracii. Po-vidimomu, vozmozhny takzhe drugie vidy. Jeto sravnitel'no prostoj i nedorogostojashhij pribor obespechivaet okazanie cennoj pomoshhi v interpretacii diagramm, proizvedennyh metodom skennirovanija. (author)}
place = {IAEA}
year = {1964}
month = {Oct}
}