[Costs and performance in roentgen diagnosis--conventional technique versus digital technique].

Relationships from benefits-costs analyses in radiography are presented. The impact of several factors (equipment, frequency of examinations, ..

[Evaluation of computerized tomograms using a black and white and a color monitor: an ROC (receiver operation characteristic) comparison].

Different views about the value of a colour monitor for the evaluation of computer tomograms have prompted us to carry out this ROC (Receiver Operation Characteristic) examination. The latter was based on patient computer tomograms in which lesions of the liver were simulated by image manipulation. 5 radiologists analysed the image material (a) on a black-and-white monitor, (b) on a colour monitor, and (c) simultaneously on a black-and-white and a colour monitor.

[Therapeutic effectiveness of CT-controlled drainage puncture in amebic abscesses of the liver].

Amebic liver abscesses are the most frequent clinical manifestations of the extra-intestinal amebiasis and have to be considered as a serious complication in the course of disease. The abscesses have by their risk of rupturing and bacterial superinfection quoad vitam an unfavourable prognosis. CT-guided relief punctures can, as it is demonstrated by two cases of critical amebic abscesses, effectively improve the therapy with systemic amebicides, prevent imminent rupture and contribute to the healing of the abscesses.

[CT-guided sclerosing therapy of kidney cysts. Report of experience with 100 patients].

Due to its diagnostic accuracy as well as safe and accurate puncture technique CT can be used advantageously for percutaneous sclerosing therapy of renal cysts. CT-guided sclerosing therapy with pantopaque emulsions was carried out in 100 patients on an outpatient basis with altogether 107 solitary renal cysts. There were indications in all cases.

[ROC (receiver operating characteristic) study for the recognition of liver lesions on the computer tomogram].

ROC examination was based on patient computer tomograms, in which lesions of the liver were simulated by image manipulation. The window width for optimal recognition of the lesions was found to be 128 Hounsfield units (HU). Evaluation of Receiver Operating Characteristics (ROC) by diameters and contrasts of the lesions yielded a contrast detail diagram largely reflecting conditions in clinical practice.