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Biomedical subjects

O Tervonen

Publications and source records attributed to O Tervonen.

56 records · Page 4Linked to original sources
PubMedDate not supplied

Image technique optimization in MR imaging of a titanium alloy joint prosthesis.

The purpose of this study was to explore systematically the effect of the imaging parameters changeable by the user in spin-echo (SE) imaging sequences to minimize image distortion when imaging joint prostheses. A titanium alloy hip joint prosthesis was studied at I.O.T. The SE imaging parameters were bandwidth/pixel(BW/ p), TE, strength of encoding gradients (matrix size), echo train length (ETL), and direction of phase and frequency encoding. The effect of ETL in rapid acquisition relaxation enhanced (RARE) sequences was also evaluated with a turbo-SE sequence using a different ETL with the same TR and an effective TE. It is concluded that an optimized image quality can be achieved in SE imaging by using a high bandwidth/pixel value (at least 130 Hz/pixel), a high resolution matrix (256-512), sequences with multiple refocusing, and a frequency-encoding axis parallel to the long axis of the prosthesis. The degree of distortion is reduced with this optimized technique.

Alloys↗
PubMedDate not supplied

The teleradiology system and changes in work practices.

After the design and development of the teleradiology system, a work practice oriented approach was used to gain a more holistic understanding of the relationship between the emerging work practice and the newly implemented technology, and to provide information for redesigning the system. The approach which utilized ethnographically informed fieldwork and cooperative workshops was introduced. Cooperation, the chain of tasks, and articulation work of teleradiology work practice were described, with the focus on image interpretation in particular. From the point of view of radiologists image interpretation work, a report was made on how these findings influenced the evaluation and redesign of the system. Furthermore, the problematics of distributed collaboration, reorganization of work, and education are emphasized.

Anthropology, Cultural↗