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Biomedical subjects

O Ferrer-Roca

Publications and source records attributed to O Ferrer-Roca.

At least 37 records · Page 2Linked to original sources
PubMed1982

Massive articular chondrocalcinosis. Its occurrence with calcium pyrophosphate crystal deposits in nucleus pulposus.

We studied a case of long-standing chondrocalcinosis that after 40 years affected almost all fibrocartilages, hyaline cartilages, and articular cavities within the subject. Massive deposits of dihydrocalcium pyrophosphate (CPP) were also found in nonfissured nucleus pulposus of the vertebral disks. To our knowledge, this is the first report of CPP deposits in these disks.

Aged↗
PubMed1980

Intravascular and sclerosing bronchio-alveolar tumor.

A case of intravascular and sclerosing bronchio-alveolar tumor is presented with ultrastructural observations. The tumor cells appear to arise from the alveolar lining and are characterized by a fibrillary cytoplasm. These cells are enmeshed in interstitial tissue containing fibrils, elastin material, amorphous intercellular substance and degenerated cytoplasmic processes. The patient, a 49-year-old white woman, is alive without treatment, with no significant increase in size or number of lung nodules 7 years after the clinical discovery.

Bronchi↗
PubMed1980

Restrictive cardiomyopathy in pseudoxanthoma elasticum.

A unique case of severe and diffuse endocardial fibroelastosis covering the entire left ventricle and associated with pseudoxanthoma elasticum is presented. The clinical picture was that of an apparently primary restrictive cardiomyopathy. Specific histologic lesions could be recognized in the endocardium.

Adult↗
PubMedDate not supplied

Virtual sonography through the Internet: volume compression issues.

BACKGROUND: Three-dimensional ultrasound images allow virtual sonography even at a distance. However, the size of final 3-D files limits their transmission through slow networks such as the Internet. OBJECTIVE: To analyze compression techniques that transform ultrasound images into small 3-D volumes that can be transmitted through the Internet without loss of relevant medical information. METHODS: Samples were selected from ultrasound examinations performed during, 1999-2000, in the Obstetrics and Gynecology Department at the University Hospital in La Laguna, Canary Islands, Spain. The conventional ultrasound video output was recorded at 25 fps (frames per second) on a PC, producing 100- to 120-MB files (for from 500 to 550 frames). Processing to obtain 3-D images progressively reduced file size. RESULTS: The original frames passed through different compression stages: selecting the region of interest, rendering techniques, and compression for storage. Final 3-D volumes reached 1:25 compression rates (1.5- to 2-MB files). Those volumes need 7 to 8 minutes to be transmitted through the Internet at a mean data throughput of 6.6 Kbytes per second. At the receiving site, virtual sonography is possible using orthogonal projections or oblique cuts. CONCLUSIONS: Modern volume-rendering techniques allowed distant virtual sonography through the Internet. This is the result of their efficient data compression that maintains its attractiveness as a main criterion for distant diagnosis.

Algorithms↗