Sample records for xeroradiography
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Xeroradiography and ultrasonography in the evaluation of a penile injury.
Oesterling, J E; Bromberg, W D; Albertsen, P C
1986-04-01
A 34-year-old white man presented with severe penile cellulitis following injection of epoxy glue into the shaft of the penis. Preoperative xeroradiography and ultrasonography localized the hardened masses of glue to the left corpus cavernosum and subcutaneous tissues. Under the guidance of intraoperative ultrasonography this foreign material was removed surgically. Postoperatively, the cellulitis resolved promptly and xeroradiography demonstrated no residual fragments. Although various modalities, including computerized tomography and roentgenography, are available to detect foreign bodies in soft tissues, xeroradiography and ultrasonography are ideally suited for use in the male external genitalia.
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A cost analysis comparing xeroradiography to film technics for intraoral radiography.
Gratt, B M; Sickles, E A
1986-01-01
In the United States during 1978 $730 million was spent on dental radiographic services. Currently there are three alternatives for the processing of intraoral radiographs: manual wet-tanks, automatic film units, or xeroradiography. It was the intent of this study to determine which processing system is the most economical. Cost estimates were based on a usage rate of 750 patient images per month and included a calculation of the average cost per radiograph over a five-year period. Capital costs included initial processing equipment and site preparation. Operational costs included labor, supplies, utilities, darkroom rental, and breakdown costs. Clinical time trials were employed to measure examination times. Maintenance logs were employed to assess labor costs. Indirect costs of training were estimated. Results indicated that xeroradiography was the most cost effective ($0.81 per image) compared to either automatic film processing ($1.14 per image) or manual processing ($1.35 per image). Variations in projected costs indicated that if a dental practice performs primarily complete-mouth surveys, exposes less than 120 radiographs per month, and pays less than +6.50 per hour in wages, then manual (wet-tank) processing is the most economical method for producing intraoral radiographs.
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The clinical role of skeletal scanning.
Ell, P. J.
1975-01-01
Malignant disease very often spreads to the skeleton. This is particularly true for carcinomas of the breast, the lungs, the prostate, and the thyroid. Knowledge of the state of the skeleton in these disorders is therefore desirable since patient management will largely depend on the early detection of bony deposits. Primary bone disease often spreads to soft tissue (lungs), and the early detection of this may alter significantly the therapeutic approach to the primary lesion. Traditionally, X-ray skeletal surveys and serum enzyme measurements provide indices which can be used in the staging of these disorders. Complementary techniques such as mammography, xeroradiography, thermography, and radionuclide imaging have been used to provide further relevant information. A number of benign bone diseases need early assessment in order to institute the best form of treatment. It is of importance to assess the circulation in localized areas of bone and to predict the appearance of avascular necrosis, to understand the healing mechanisms involved in fractures, and to predict the outcome of bone grafting. In this paper the clinical role of bone scanning is reviewed, particular attention being given to the recent advances brought about by the introduction of the 99mTc compounds. It is important that the non-specialist should be aware of the great improvement in the results obtained and in the help they can give him in deciding on the best management of each patient as an individual. Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 PMID:1211792
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A new photoconductor imaging system for digital radiography.
de Monts, H; Beaumont, F
1989-01-01
Amorphous selenium is a material often used in the x-ray imaging system. The main application is in xeroradiography where the structure of the sensor is a layer of selenium on a conductive substrate. The signal is a charge density on the surface which is revealed by a toner or by electrostatic probe for digitalization. In the system described here, the sensor structure is different for the sensor is covered by an electrode, a thin layer of metal, which gives another interface. The reading system needs the scanning of a light beam and the resolution power depends on the size of the beam. It is easier to scan a light beam than electrostatic probes so a more compact system can be realized. In the process, there are two phases: the storage and the reading. The time spent between the two phases reduces the quality of the image, and an in situ reading system, integrated to the radiographic machine will be, for this reason, more efficient. Also, the sensor needs good memory effect. One has investigated different sensors based on a structure of a thin photoconductive layer between two electrodes to find a memory effect. We have already seen this phenomena in the Bi12 SiO20 (B. Richard, "Contribution à l'étude d'un procédé d'imagerie radiologique utilisant le photoconducteur BO12 SiO20," Ph.D. thesis, Paris, 1987). In amorphous selenium with some dopants and some type of metallic contact, the memory effect is important enough to realize a system. With 2 X 2 cm samples, a complete x-ray digital imaging system has been built.(ABSTRACT TRUNCATED AT 250 WORDS)