Objective symmetry detector method for gammaencephalography. III. Diagnosis of abnormal 99TcmO4 distribution in the skull

The objective classification of results of the previously described symmetry detector method for gamma encephalography is reported. The different evaluation parameters were chosen after comparing their detectability in different subregions of the head or as a result of findings in certain patients. The detectability was estimated from the results of phantom measurements related to the normal ranges of evaluation parameters. The borders of the classification criterion are discussed in relation to the number of evaluation parameters used.

Objective symmetry detector method for gammaencephalography. II. Normal range

A standardized clinical examination procedure of a previously described symmetry detector method for gammaencephalography is presented and the results obtained from a reference group of subjects without known neurologic disorders are reported. The 99TcmO4 distribution in the skull was investigated by 208 evaluation parameters obtained from measurements of 24 subregions of the skull from 48 symmetrical positions. Mean values and associated inter-individual and intra-individual standard deviations are given. Different sources of variation are discussed in relation to the results obtained. The method enables the 99TcmO4 distribution in the skull to be objectively classified as normal or abnormal.

Objective symmetry detector method for gammaencephalography. I. Physical characteristics

A symmetry detector method for gammanecephalography is described. It is based on two detectors, collimated by square tubes with large apertures. Increase ratios and side difference ratios should be used as evaluation parameters in clinical applications and are therefore analysed theoretically and experimentally from measurements on a phantom system. The effect of energy discrimination is analyzed and found to be small over a wide range of the lower discrimination level setting. The chosen performance of the measuring routine used made errors caused by the electronic devices negligible in relation to the loss of precision occurring from counting statistics.

Isolation of L-forms reverting to Staphylococcus aureus from pus of patients with staphylococcal infections: a study on 31 cases of staphylococcal infections treated with antibiotics

Abstract The results of regularly performed cultures with the aim of isolating L-forms from pus from 31 patients treated with antibiotics for staphylococcal infections are presented. In 3 cases growth of L-forms of Staphylococcus aureus was obtained on penicillin-free media. These patients had not been treated with cell wall affecting antibiotics for 2 weeks or more prior to the isolation of Informs.

An Apparatus for Non Destructive Study of Atom Transport in Liquids

A description is given of a method developed for diffusion and electrotransport measurements in liquids, which permits several successive readings on a sample in uninterrupted anneal. Errors from solidification and sectioning are avoided, and the reproducibility of measured diffusion coefficients is better than two percent. Experimental results are given for gallium self-diffusion. The present apparatus can be conveniently applied to many liquids solidifying below some 280 °C utilizing gamma tracers with energies in the range 0.2 - 2.0 MeV. The design can be modified for higher temperatures.