Biomedical subjects

J Tolwiński

Publications and source records attributed to J Tolwiński.

12 recordsLinked to original sources

PubMed1978

On the use of pooled receiver operating characteristic curves in the evaluation of scintigrams.

The assessment of simulated scintigraphic pictures by means of curves based on binary decisions of individual observers called pooled ROC-curves or pooled L-ROC-curves is presented. The technique of creating the curve is described. The examples of various processing techniques and the findings of various groups of observers are compared and discussed. The images of two IAEA simulated phantoms were used to perform the evaluation. The results indicate that the pooled L-ROC-curves may serve as a measure of image quality.

Humans↗

PubMed1975

Evaluation of the effect of respiratory movements of the organs on the resolution index.

The motions of the respiratory movement of the diaphragms were filmed and the character of the motion was evaluated. The line-spread function of a motionless line source was compared with that of a moving source (for two kinds of motion: regular and harmonic). Similar calculations were made for increasing the motion amplitudes of the source and for different values of static resolution. The final dynamic resolution was calculated. The results show that when respiratory motion exceeds 13 mm (which happens in about 50% of clinical examinations) the resolution decreases by more than 25% so that it is necessary to use special methods of eliminating these artefacts.

Diagnostic Errors↗

PubMed1974