Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “spatial localization”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 217 records · Page 12Linked to original sources
PubMed1991

[Experience with more than 200 cases of breast biopsy after preoperative spatial localization without radiostereotaxic equipment].

The use of mammography as a screening examination has considerably increased our ability to detect non-palpable breast lesions less than 1 cm phi. A conclusive diagnosis frequently requires surgical biopsy. However, breast lesions can be localized prior to surgical biopsy by placing a wire in the lesion, with/without the use of stereotaxic equipment. Our method for lesion localization consisted in acquiring two orthogonal radiographs (cranio-caudal and latero-lateral) centered on the nipple. We used 20-21 G needles, 6-10 cm long, with curved-end wire. Mammographic findings possibly suggesting cancer were: microcalcifications, nodules, spiculated opacities, and architectural distortions. From January 1987 to January 1990, 223 patients were submitted to needle localization of breast lesions under mammographic guidance and without stereotaxic equipment. Sixty-seven cases (30%) were positive for malignancy, with a 2.3:1 benign/malignant ratio. Patients' age ranged 30-70 years, but most of them were 50-60 years old. No significant complications were observed: in one case only the hook wire broke, within breast parenchyma, which was at any rate resected together with the surgical specimen.

Adult↗
PubMedDate not supplied

[Accuracy of the spatial localization of the sources of brain bioelectrical activity in a model homogeneous unrestricted environment].

The possibility is considered of use of the model of homogeneous unlimited medium (HUM) for localization of sources of brain bioelectrical activity at recording of electric potentials on its surface. It is shown that when the recording electrodes are arranged in accordance with 10-20 system, the source localization error does not exceed 10% of the head radius practically in any position of the source. A significant dependence is revealed of the source localization error on the concrete electrodes system used in experiment. It demands careful treatment of the available general recommendations on correction of the position of the source found by HUM model without consideration of the concrete arrangement of recording electrodes.

Brain↗
PubMed1987

Recession vs marginal myotomy surgery for strabismus: effects on spatial localization.

Palisade endings (PEs) are found at the musculotendinous junction in eye muscles and this is the site of much strabismus surgery. To assess the role of PEs in supplying proprioceptive information about eye position, we compared the effects of marginal myotomy and recession surgeries on tests of eye-hand coordination (open-loop pointing responses) taken before and after surgery in two groups of children having medial rectus weakening procedures for the first time. The results indicate that the myotomy is more proprioceptively "de-afferenting" than the recession, and we assume this is due to the greater disruption of PEs in this procedure.

Child↗