| 21. |
- Erdman, William A., et al.
(författare)
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Development of a Digital Nuclear-Medicine System
- 1983
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Ingår i: Proceedings of the Society of Photo-Optical Instrumentation Engineers. - : Society of Photo-Optical Instrumentation Engineers. - 0361-0748. ; 418, s. 100-102
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Tidskriftsartikel (refereegranskat)
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| 22. |
- Hafström, Larsolof, et al.
(författare)
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Influence of vasoactive drugs on blood flow in subcutaneous tumors – an experimental study in rats
- 1980
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Ingår i: Journal of Surgical Oncology. - : Wiley. - 0022-4790 .- 1096-9098. ; 14:4, s. 359-366
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Tidskriftsartikel (refereegranskat)abstract
- Subcutaneously implanted tumors in Wistar and Lister rats were used as a model for the study of metastatic tumor blood flow and how it is affected by vasoactive drugs. Blood flow measurements were obtained using the labelled microsphere method and the reference organ technique. Microspheres (15‐μm) labelled with either 99Tcm or 51 Cr isotopes were injected intracardially and a reference sample was drawn simultaneously at constant speed. This was performed before and after the infusion of vasoactive drugs, and (as control), saline infusion. The drugs tested (adrenaline, noradrenaline, glucagon, histamine, and vasopressin) showed profound effects on central hemodynamic parameters and on muscle and skin blood flow. The relative tumor blood flow, measured as the ratio between tumor and skin or tumor and muscle blood flow, was calculated. The results show that no enhancement of the relative tumor blood flow could be registered. In fact, a decrease in the tumor‐to‐muscle‐blood‐flow ratio was noted when noradrenaline was infused, and in the tumor‐to‐skin ratio when adrenaline was infused. Blood flow in subcutaneous tumors was four to five times that in muscle or skin. Tumor blood flow was also inversely related to the size of the tumor.
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| 23. |
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| 24. |
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| 25. |
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| 26. |
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| 27. |
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| 28. |
- Horii, Steven C., et al.
(författare)
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Unified Digital Image Display and Processing System
- 1981
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Ingår i: Proceedings of the Society of Photo-Optical Instrumentation Engineers. - : Society of Photo-Optical Instrumentation Engineers. - 0361-0748. ; 314, s. 340-346
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Tidskriftsartikel (refereegranskat)
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| 29. |
- Johansson, Gerd, et al.
(författare)
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A Study of Indoor Aerosol Size Distribution and Attachment of Radon Daughters
- 1983
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Ingår i: Journal of Aerosol Science. - : Elsevier BV. - 0021-8502. ; 14:3, s. 455-458
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Konferensbidrag (refereegranskat)abstract
- The particle size distribution in 11 different dwellings was studied during 5-7 days, samples being taken every 15 min. Large variation in the aerosol concentration has been found. Also the size distribution of the aerosol varies depending on the level of activity in the home, e.g. smoking and cooking. The average area median diameter found in the dwellings was 0.2 ,am. A technique for the measurement of radon daughter distribution on different airborne matter was developed and tested. The method is based on the use of an electrical mobility analyzer and alpha-spectrometry of the radon daughters collected on a fluoropore filter. Some results are presented and discussed.
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| 30. |
- Johansson, Gerd, et al.
(författare)
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Characterisation of the Aerosol and the Activity Size Distribution of Radon Daughters in Indoor Air
- 1984
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Ingår i: Radiation Protection Dosimetry. - 1742-3406. ; 7:1-4, s. 133-137
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Tidskriftsartikel (refereegranskat)abstract
- The aerosol size distribution in 11 dwellings was measured using an electrical mobility analyser (TSI 3030). Large variations in the aerosol concentration, e.g. in connection with cooking and smoking were detected both within a single dwelling and between different dwellings. A typical size distribution shows an area median diameter of 0.2 µm with a geometrical standard deviation of about 2. Variations in the particle size distribution were observed, e.g. cooking decreases the median size of the particles whilst smoking increases the size. Through a modification of the TSI 3030 the activity of the radon daughters distributed on different particle sizes can be assessed. Measurements were performed both in the laboratory and in a dwelling showing an activity distribution close to the particle area distribution. Large variations in the unattached fraction of radon daughters due to variations in the aerosol concentration of the dwelling were observed.
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