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PubMed · 109899

The inverse compensating filter.

K E Ekstrand·C R Ferree·R L Dixon·M Raben
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Abstract

When a single-field technique is used in megavoltage x-ray therapy, a uniform entrance dose is often required. If there is a large variation in source-to-surface distance over the field, an inverse type of compensating filter is necessary to achieve entrance dose uniformity. The production and utilization of these filters is discussed.

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FiltrationHumansRadiotherapyRadiotherapy DosageRadiotherapy, High-EnergyJournal Article

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K E Ekstrand, C R Ferree, R L Dixon, M Raben. 1979. The inverse compensating filter.. https://doi.org/10.1148/132.1.201

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Combination of a viability test and a quantification method for Schistosoma haematobium eggs (filtration--trypan blue-staining-technique).

The efficiency of the polycarbamate membrane filtration technique for detecting Schistosoma haematobium eggs in urine has been increased by using a pore size of 14 micrometers diameter and the suction of a water jet pump. The technique permits filtration of several 1000 ml of urine in one test. Eggs concentrations of 1 egg in more than 1000 ml of urine were detected. Viability was assess after filtration by staining with trypan blue. Preliminary data of 118 Schistosoma haematobium-positive urine samples of 32 patients suggest that the filtration trypan blue-staining-technique is of high validity in light infection with scanty egg-output.

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