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R Parienty

Publications and source records attributed to R Parienty.

At least 19 recordsLinked to original sources
PubMed1986

[How to analyze a nuclear magnetic resonance image. Application to the study of the pelvis].

Nuclear magnetic resonance (NMR) is based on the behaviour of some atomic nuclei when they are placed in a magnetic field and subjected to radiofrequency waves of a specific length. The resonance signals they emit under such conditions are collected as localized digital data which are used to construct an image. The signals vary according to multiple tissue characteristics, notably proton density, relaxation times T1 and T2 and, where applicable, blood flow direction and velocity. The relative influences exerted by these tissue factors on resonance signals can be evaluated by altering the technical parameters of the examination, that is practically the radiofrequency wave sequence. Special formulae make it possible to predict signal variations and to increase, decrease or even reverse contrast, thus obtaining as many morphological or functional images of the different media in the body. NMR semiology therefore is copious, complex and variable, but a diagrammatic description of the interplay between parameters provides a key to elementary analysis. Images of pelvic structures taken as examples illustrate the necessity to select the exploratory procedure according to the purpose of the exploration or to manipulate sequences with greater safety.

Adipose Tissue↗
PubMed1986

[Magnetic resonance imaging of pelvic tumors in men. Preliminary results in a series of 28 patients].

The authors conducted a retrospective evaluation of the diagnostic value of nuclear magnetic resonance in comparison with other imaging techniques in a series of 28 pelvic tumours, with the exclusion of gastrointestinal tumours. The positive diagnosis of the lesion was obtained in every case. The variation of the signal provided information concerning the tissues, while the sections in three planes, the spontaneous visibility of the vessels and the very good natural contrast related to the presence of fat which gives a high signal, facilitated staging of the tumour.

Bone Neoplasms↗
PubMed1980

[Scanner examination of the kidney].

On the basis of a large series of documents, the authors participate in establishment of the classification of scanner appearances of urological diseases of the kidney : peripheral or parapelvic sub-capsular cysts, carcinomas and their spread, multiple tumours but of different nature in the same kidney, angiomyolipomas, polycystic disease, renal abscess, hydated cyst, non-invasive exploration of kidneys showed to be non-functioning by I.V.U., tumours of the intrarenal excretory system, lumbar trauma, long-term surveillance of the retroperitoneal space in individuals undergoing surgery for a urological malignant renoureteric tumour. The authors suggest a new chronological arrangement of investigations in the presence of a renal mass discovered by I.V.U. Scanner has its place between echotomography and renal arteriography. Investigations may be stopped at renal echotomography when this examination offers definite evidence of the fluid nature of the mass. Solid or doubtful nature of the mass necessitates the use of a scanner examination.

Abscess↗
PubMed1979

[Phaeochromocytoma: localisation by computerised scanner tomography. 5 cases (author's transl)].

In five patients with a phaeochromocytoma, axial computerised scanner tomography made it possible to localise the tumour without ambiguity, even when intravenous urography had been interpreted as normal. Although all the tumours diagnosed were relatively large (between 3 and 9 cm), this is nevertheless a non-invasive examination, free of danger and worthy of consideration in the preoperative assessment of a case of phaeochromocytoma.

Adrenal Gland Neoplasms↗
PubMed1979

[Densitometry of the pancreas (author's transl)].

The authors present their experience of 15 months use of a C.T. Scanner of the third generation. Of 1,000 patients in which the tomography sections involved the pancreas, in one third the examination was requested for a suspected pancreatic lesion. The image of the pancreas was obvious in 9 cases out of ten. The diagnosis was correct in 8 cases out of ten. These results are extremely encouraging, and reliable compared with those of echotomography in the present state of the technic. The illustrations show the interest of C.T. Scanning in surgery, for the surgeon then has available anatomical sections of the whole supramesocolic region. The authors emphasize the necessity of pluridisciplinary comparison for better use of this technic.

Acute Disease↗