Correcting magnetic probe perturbations on current density measurements of current carrying plasmas.

A method to infer the current density distribution in the current sheath of a plasma focus discharge from a magnetic probe is formulated and then applied to experimental data obtained in a 1.1 kJ device. Distortions on the magnetic probe signal caused by current redistribution and by a time-dependent total discharge current are considered simultaneously, leading to an integral equation for the current density. Two distinct, easy to implement, numerical procedures are given to solve such equation. Experimental results show the coexistence of at least two maxima in the current density structure of a nitrogen sheath.

[Radiologic evaluation of an adverse evolution in total hip prosthesis]. / Valutazione radiologica dell'evoluzione sfavorevole della protesi totale d'anca.

The retrospective study of 50 operated cases of cemented total hip replacement and a review of the literature enabled the authors to define the radiological features of the above-mentioned condition. These features include one or more of the following signs: calcar reabsorption, lacunar erosions, modified relationships between the prosthesis components, sepsis and loosening, periarticular calcifications, dislocation and fracture of prosthesis components. Careful evaluation of these radiological features is extremely important for both an early diagnosis of failed total hip replacement and the choice of an adequate surgical treatment.

[Pierre-Marie's osteoarthropathy: scintigraphic diagnosis during staging of lung cancer]. / Osteoartropatia di Pierre Marie: diagnosi scintigrafica in corso di staging del carcinoma polmonare.

In the last years, total bone scan has gained an important place in the staging of the neoplasms of the lung. Out of 271 patients with lung cancer who underwent a bone scan in the period october 1979-october 1980. 10 showed an increased fixation of the isotope with a linear pattern along the diaphysis of the limbs. These findings, clinically silent, suggested the diagnosis of hypertrophic osteoarthropathy, which has been subsequently confirmed radiologically. The different pathogenetic theories and the evolution of the scintigraphic picture after therapy of the primary disease are briefly discussed.