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- Noz, Marilyn E., et al.
(författare)
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A modular computer system for the Nuclear Medicine/ultrasound laboratory : A multidisciplinary proposal
- 1977
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Ingår i: Journal of medical systems. - 0148-5598 .- 1573-689X. ; 1:3, s. 251-261
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Tidskriftsartikel (refereegranskat)abstract
- In many nuclear Medicine studies computer-controlled graphic displays are an absolute necessity for obtaining meaningful results. Design criteria developed by an interdisciplinary scientific panel are presented to achieve a display system based on television technology; an instrument interface employing list mode using bubble-memory storage technology, thus having a low information-loss rate; and flexible modular software easily tailored to the specific needs of both clinicians and technicians. The panel considers a minicomputer system with broad, flexible applications to be a valuable tool, particularly in doing those function studies that only can be done via nuclear medicine techniques. The final specifications ultimately allow the selection of a vendor and hospital installation, even though all criteria are not currently achievable.
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- Noz, Marilyn E., et al.
(författare)
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A modular computer system for the nuclear medicine/ultrasound laboratory
- 1977
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Ingår i: Radiology. - : Radiological Society of North America. - 0033-8419 .- 1527-1315. ; 124:3, s. 759-762
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Tidskriftsartikel (refereegranskat)abstract
- Computer-controlled graphic displays are a necessity in many nuclear medicine studies. The authors propose using a set-up consisting of three modules: (a) a display system based on television technology; (b) an instrument interface employing list mode and having a low information loss rate; and (c) flexible modular software which can easily be tailored to the needs of both radiologists and technicians. The authors consider a mini-computer system with broad, flexible applications to be a valuable tool, particularly for those function studies which can only be done by means of nuclear medicine techniques.
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- Alm Carlsson, Gudrun
(författare)
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Absorbed dose equations : The general solution of the absorbed dose equation and solutions under different kinds of radiation equilibrium
- 1978
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This report is a logical continuation of two papers concerning basic concepts in dosimetry. The first paper (1) is u critical analysis of the concepts of ionizing radiation and energy imparted as defined by the ICRU (2). The second paper (3) gives a definition of the energy imparted, the fundamental quantity in radiation dosimetry, which is equivalent to that given by the ICRU but which has a different form. This alternative definition of the energy imparted is suitable in deriving a general expression, in terms of particle fluences and interaction cross sections, for the absorbed dose valid also in situations where no kind of radiation equilibrium is established. It is, however, today not possible to quantify this expression for the absorbed dose. All practical calculations of absorbed dose rely on the assumption of one or another type of radiation equilibrium. The aim of this work is to analyze different kinds of radiation equilibrium conditions and to find the corresponding exact expressions for the absorbed dose. The concept of radiation equilibrium is more carefully analyzed than has been done previously (4, 5, 6). Moreover, the definition of the mass energy absorption coefficient for indirectly (uncharged) ionizing particles is critically analyzed. A new definition is proposed relevant to calculations of the absorbed dose in cases when charged particle equilibrium exists within a homogeneous medium due to the uniform liberation of charged particles, by uncharged particles.
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- Alm Carlsson, Gudrun
(författare)
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Burlins kavitetsteori
- 1979
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Burlins kavitetsteori är en generell teori i den meningen att inga krav finns på detektorns dimensioner jämfört med sekundärelektronernas räckvidder. Detektorn måste dock vara "tunn" för fotonerna dvs inte ge någon nämnvärd attenuering av de mot detektorn infallande fotonerna
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