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Biomedical subjects

L Bacarini

Publications and source records attributed to L Bacarini.

35 records · Page 2Linked to original sources
PubMed1978

[Criteria for choosing the screen-film system in x-ray diagnosis (author's transl)].

The physical dimensions to be kept in mind in choosing the screen-film system in radiography are defined and discussed. As an example of applying the method, the results of measuring these dimensions on 5 types of film and 6 types of screen are reported and their optimal combinations indicated as a function of examination conditions.

Radiographic Image Enhancement↗
PubMed1977

The use of abdominal contrast tomography in liver disease.

The value of a high dose infusion technique using urographic contrast medium followed by tomography was studied in 44 patients with liver disease. The method was found to be of value in showing cysts, abscesses and cystic disease of the liver. Large tumours, primary and secondary, can also be demonstrated. Normal bile ducts are not visible, but become apparent when they are dilated.

Contrast Media↗
PubMedDate not supplied

[Echotomography in the study of the pathology of Achilles tendon].

Achilles tendon was evaluated by B scan ultrasound in 54 cases (20 normal and 34 symptomatic subjects). The ultrasonographic features of tendon's diseases were correlated with the anatomical patterns. On the basis on their experience, the authors concluded that ultrasonography is a simple and highly accurate method for the diagnosis of Achilles tendon diseases and that it should be the initial imaging procedure.

Achilles Tendon↗
PubMedDate not supplied

[Light production from intensifying screens (theoretical and experimental aspects)].

The authors show the results of an experimental study on the light conversion efficiency of the absorbed energy from an incident X-ray beam by different kinds of intensifying screens. They stress that the absolute speed curves drawn for each intensifying screen, express (in the energy range 10 to 100 keV) the light output for an incident X-ray of a certain energy value. In this way, the knowledge of the X-ray tube emission spectra for a fixed kVp allows to forecast with good accuracy, the light output and the emerging spectra from an intensifying screen. They emphasize the importance of the K-edge (K shell electrons binding energy) as a factor affecting the phosphors behaviour both for what concerns the radiation filtration and the light conversion efficiency of the absorbed radiation.

Light↗
PubMedDate not supplied

[Statistics of bone mineral density determined with a double-energy X-ray equipment].

This study was aimed at analyzing the bone mineral density values measured in a non-selected sample of more than 2,500 Italian women from the Treviso province. The subjects were divided into nine 10-year age groups. The figures (%) in each age group are presumed to be constant over time, although arranged on a Gaussian curve because of high interperson variability. The tables with normal rates, made on the basis of the data obtained, represent the reference parameters to evaluate bone mineral content in all the women referred to our hospital for this particular reason. The tables mirror, with the highest possible accuracy, the typical figures of the female population in Treviso, inasmuch as those findings were obtained from a statistically homogeneous sample (that is, uniform in nature). On the other hand, slight differences were observed relative to the figures of population segments other than our study population. Since the risk of bone fractures is related to how quickly bone mass decreases over time, seriated measurements should be compared with the normal curve which is similar in women of every race. Thus, the tables indicate probable normality whenever the figure found for one woman falls within the normal age and race ranges the patient belongs to. If the patient belongs to a population with different lifestyle and environmental factors, the tables are but indicative; for more accurate evaluation, a late control should be made. On the contrary, if rates are markedly lower than normal, a control should be made much sooner. Moreover, the correlations between the bone density rates found in different bone segments indicate the very poor chance of predicting fracture risk at a different point from the examined one. This means that the body areas at greater risk must be studied separately. Finally, we stress the reason why it is impossible to obtain the very same information from bone mineral content measurements on the whole skeleton and how these data can be used.

Absorptiometry, Photon↗
PubMedDate not supplied

The radiological assessment of rheumatoid arthritis.

Antirheumatic therapy has changed from a rather conservative approach towards more aggressive early intervention. Objective measures of the course and outcome of rheumatoid arthritis are essential to understand the disease process and evaluate the therapeutic response. Radiological evaluation fulfils many of the criteria of objectivity: the films provide a permanent record and can be evaluated serially and repeatedly; the changes do not fluctuate with disease activity; and good technique and correct timing can keep the radiation load to a very acceptable level. Consequently, therapies can be evaluated on the basis of their efficacy on radiological progression. In clinical practice, a visual qualitative assessment is usually sufficient, but for therapeutic trials or studies of disease progression in certain patient groups, quantitative methods are needed. A number of different evaluation systems have been introduced, but none of these have gained universal acceptance. No ideal evaluation method (which should be rapid, easy to use and have a good level of reproducibility) has yet been found. Here we make provisional recommendations on the conduct of future therapeutic trials to maximise the likelihood that they will give conclusive results using radiographic outcome assessments.

Antirheumatic Agents↗