S T Ostrowski | PubMed Health

PubMed1976

A comparison of clinical results in brain scanning using germanium semiconductor detectors and sodium iodide detectors.

A comparison is presented of the image quality obtained with a 70 mm Ge(Li) detector scanner and with routine techniques based on NaI (Tl) detectors. One hundred and sixty-five pairs of brain scans have been examined for which the patients have been scanned with both Ge(Li) and NaI (Tl) detectors. It is concluded that no major difficulties exist in introducing Ge(Li) scanners and that while a comparison of scans from different instruments is difficult there is evidence that improved diagnostic information may be obtained from scanners with Ge(Li) detectors.

Brain Diseases↗

PubMed1975

Kidney depth measurements using a double isotope technique.

Differences in kidney depth, particularly between the two kidneys of an individual patient, may lead to distortions of the renogram owing to attenuation and geometrical factors. A method of assessing the magnitude of these variations was developed. A double isotope technique was used, employing 125-I and 131-I Hippuran, the kidney depth being a function of the ratio of the count-rates from the two isotopes. It was necessary to apply a correction for extrarenal activity, based on a third detector and doubly labelled human serum albumin. The average kidney depth observed was 7.3 cm; in only two cases out of 13 did the difference in depth of the two kidneys exceed 1 cm. It is concluded that when 131-I Hippuran is used the consequent distortion of the renogram is acceptable. With 125-I the distortion may be excessive, even though the contribution of extrarenal activity is then reduced. There was frequently an apparent increase in the depth of activity during the renogram attributable to intrarenal translocation of the tracer.

Anthropometry↗