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Biomedical subjects

R S Ledley

Publications and source records attributed to R S Ledley.

At least 55 records · Page 3Linked to original sources
PubMedDate not supplied

A physician questionnaire study of the net cost of computerized tomographic scanning.

This paper reports the results of a physician questionnaire study of the net cost impact of CT Scanning on the health care system. The study objective is accomplished by questioning physicians, on a case-by-case basis, on the number and type of diagnostic tests and hospital care which would have been provided in lieu of CT. These findings indicate that CT Scanning, while expensive on a per use basis, results in significant cost savings on a per case basis because it eliminates the need for multiple alternative tests and hospital stays. Finally, the controversy over the cost of CT Scanning is attributed not to the intrinsic merits of CT but rather to structural elements within the health care system which create disincentives to economize.

Brain Diseases↗
PubMedDate not supplied

Data banking.

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Amino Acid Sequence↗
PubMedDate not supplied

Variation of ACTA scanner numbers with the physical properties of the scanned material.

An experiment has been carried out in which an ACTA computerized axial-transverse tomographic scanner was used in a series of scans on a polystyrene phantom. Cavities in the phantom contained distilled water and various concentrations of acetic acid or ferric nitrate in aqueous solution. It is shown that the ACTA numbers generated for the low-Z acetic acid solution are proportional to the electron density of the solution, but that such is not the case for the higher-Z ferric nitrate, where photoelectric absorption is significant. The correlation of scanner numbers with electron density rather than with mass density is discussed and, as an illustrative example, the electron densities of whole blood and blood cells are calculated and the relative value is compared with the relative mass densities of the materials.

Diagnosis, Computer-Assisted↗