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Biomedical subjects

R Olmi

Publications and source records attributed to R Olmi.

At least 19 recordsLinked to original sources
PubMed1988

Analysis of electric and magnetic fields leaking from induction heaters.

Results are presented of an investigation on electric and magnetic fields leaking from inductive (magnetic) heaters that are used for thermal processing of high-power electron tubes and lasers in an industrial plant. Measurements of electric and magnetic fields were done using both commercially available and laboratory-developed instrumentation. Isotropic H-field sensors were developed to allow quantitative evaluation of high-intensity magnetic fields. Ten induction heaters with nominal A.C. power ranging from 2.5 kW to 15 kW and operating at frequencies between 300 kHz and 790 kHz were surveyed. Electric field strengths up to 8 kV/m and magnetic field strengths up to 20 A/m were measured.

Environmental Exposure↗
PubMed1978

Secondary treatment of fractures of the middle and lower third of the tibia unsuccessfully treated by primary internal fixation.

The authors present forty six cases, referred to us between 1969 and 1974, of fracture of the middle and lower thirds of the tibia, previously treated elsewhere by primary internal fixation using a plate and screws. The causes of failure are divided into defective indications and defective technique. The methods of treatment used in infected and non-infected lesions are described. They criticise the unnecessary use of plates and explain their reasons. They do not condemn the method outright, since in selected cases IT IS UNDOUBTEDLY A VALID METHod of treatment. They are opposed, however, to its indiscriminate use for lesions that may perfectly well be cured, with the minimum risk, either by conservative methods, or by intramedullary nailing.

Fracture Fixation, Internal↗
PubMed1977

[Evaluation split renal function and compensatory hypertrophy using a radio-isotopic technique].

Using a new method for the determination of split renal function with a radio-isotopic technique (FG Hipaque I131 and PRP Hippuran I131) we sought to determine residual renal function with pre-operative studies, especially in preparation for nephrectomy, and secondly with postoperative studies of compensatory renal hypertrophy after total or partial nephrectomy and the restoration of function in the kidneys following surgery of the urinary tract. A total of 20 cases was studied. We noted marked compensatory hypertrophy after total and partial nephrectomy and the prompt return of function after procedures involving the urinary tract, on condition that any acute infection be prevented.

Adult↗
PubMed1976

Haemangioma of bone with radiographic appearances simulating a giant cell tumour.

A case is described of haemangioma of the proximal end of the humerus which simulated a giant cell tumour on radiography. An attempt at biopsy, carried out elsewhere, had failed because of severe haemorrhage from the tumour during operation. It was treated by en bloc resection and endoprosthesis with a good result after one year.

Bone Neoplasms↗
PubMedDate not supplied

Phantom characterization of applicators by liquid-crystal-plate dosimetry.

A method for the determination of the SAR distribution produced by an electromagnetic applicator for localized hyperthermia is described. The procedure for SAR evaluation consists of recording the time evolution of the temperature inside a polyacrylamide phantom by means of thermochromic liquid crystal sheets inserted in it. The technique allows a complete characterization of applicators in a very broad frequency range, using power levels of the order of those needed in real treatments. Criteria for the minimum phantom size and the maximum time duration of the characterization procedure are indicated, which allow a reliable determination of the effective field size and penetration depth of the applicator.

Biophysical Phenomena↗