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- W2091279795 abstract "AbstractThe possibility has been demonstrated of significant image improvement in screen -filmmammography without increase in relevant patient dose, when a fast screen -filmcombination is used with magnification or grid, when compared with a slower screen -filmcombination using conventional technique (no grid use or magnification). An ideal dedi-cated mammography x -ray unit, containing a small (+ 300 micron) tungsten focal spot, anda grid should result in optimal imaging of all breast sizes and tissue consistencies.IntroductionAt present the Xerox 125 system demonstrates finer anatomic details than screen -filmcombinations. However, this is at the cost of twice as great gxposure to the breastglandular parenchyma, even with high kVp /filtration technique. Ppparently a lowdose Xerox system is not in prospect. Consequently it is important to improve screen -filmimages while retaining patient exposure. Fortunately both scatter reduction anddirect magnification can improve these images.Barnes' work indicates that 50% greater mammographic image contrast should result fromtotal scatter removal (2). Friedrich's study using the Philips mammography grid supportsthis view (3). Sickles (4) and Haus (5) reported substantial image improvement from useof direct magnification. However, fast image receptors were not used in all these imageevaluations. As a result, patient exposure was at least double that of conventionallow dose screen technique. Therefore these studies did not address the importantquestion: Can one significantly improve screen -film images, while retaining low dosepatient exposure?The present paper presents preliminary results of a study designed to answer thisquestion. Both direct magnification and grid images were compared with those obtainedusing conventional molybdenum target tube technique. In addition:1. A very fast film was used to achieve low dose operation.2. Visibility of calcific and soft tissue detail was measured using a quantitative breastphantom.3. Average glandular parenchymal exposures wer compared for various techniques, using anovel dosimetry breast model and procedure.Materials and MethodsWe used two mammography machines: a Philips Mammo Diagnost, operated both with andwithout the new Philips mammography grid, and an RSI magnification unit *. Figure 1 givesexposure details. A single Kodak Min -R screen was used throughout, with a Picker vacuumbag system to assure good screen -film contact. In addition to the Min -R screen, a newfast experimental film, designed by Eastman Kodak, was also used (which, in this paperwe shall refer to as film). This was of single emulsion, orthochromatic design and2.5 times faster than Min -R film. It also has more contrast. Development was carriedout in a well -stabilized Kodak X -omat processor during a single seven -hour period." @default.
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- W2091279795 date "1979-07-06" @default.
- W2091279795 modified "2023-09-23" @default.
- W2091279795 title "<title>Mammography With Magnification And Grids Detail Visibility And Dose Measurements</title>" @default.
- W2091279795 doi "https://doi.org/10.1117/12.957134" @default.
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