MATERIALS AND METHODS More than 850 area scans were performed in this series of
experiments to ascertain how the integrated area counts of scans vary with radionuclide …

RESULTS Evaluation of the Counting System. Analysis of a linear scan of a small source
(right circular cylinder 0.5 cm. diameter by 1 cm. length) of 59Fe ferrous citrate (10/Lc) …

Scanning can supply information for the quantitative measurement of radionuclides
deposited in internal organs. This fact was demonstrated by many scan experiments on …

[en] The quantitative relationship between scintigram area and cross-section of the organ
under investigation has, up to now, been studied only in connection with determinations of …

In order to measure the amount of radioactive tracker taken up by an organ in the human
body, it is necessary to determine the depth of the organ in the body. A procedure is …

A Machine has been built in the Hammersmith Hospital Physics Department to relieve the
tedium of routine isotope scanning by hand. An automatic scanner was needed which had to …

The second method is graincounting. Graincounting is considerably more time-consuming
than densitometiy be cause, insteadof performingone averagemeasurementper field, N …

Progressive improvements in recording methods, collimation, data extraction technics, and
the selection of materials with increased differential uptake have resulted in a growing …

In 1952 Mayneord (1) proposed the usefulness of a transmission counter for plotting outlines
of organs. Later, he produced images of lead letters by recording the transmitted beam from …

The use of radioisotope scanning for mapping the distribution of radioactive materials in the
body is now well established. In some applications it is necessary to outline underlying …