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Biomedical subjects

R D Moseley

Publications and source records attributed to R D Moseley.

30 records · Page 2Linked to original sources
PubMed1975

The coming crisis in radiological manpower--shortage?

The 1966 NACOR Report spurred such a sharp growth in numbers of radiologists that today there is concern about an oversupply. Considering all the factors involved--panic reaction to an undocumented "surplus", sharp diminution of the residents in the training pool, and potantial massive increases in demand for radiological services--the authors believe it not unreasonable to anticipate a real shortage of radiologists in the near future. Any deliberate activity at the present time to reduce the output of radiologists in this country would seem premature and potentially disatrous.

Radiology↗
PubMedDate not supplied

Perception of simulated lung lesions.

Two series of test radiographs were produced, each containing a single nodular lesion. Each series was identical except that the lesions were spatially shifted with respect to adjacent structures, resulting in matched pairs of chest radiographs simulating a stereoscopic examination. Observation of each set singly and in pairs (non-stereoscopically) demonstrated a marked improvement in observer performance when the shifted pairs were viewed side-by-side.

Diagnostic Errors↗
PubMedDate not supplied

Observer Performance as a function of viewing distance.

The performance of observers in detecting solitary lung nodules of 1.0 and 1.5 cm diameter has been measured for viewing distances of 46, 91, 183, and 470 cm. The data indicate that observer accuracy for detection of 1.5-cm nodules as measured by the area under the ROC curves is essentially unchanged for the three closest viewing distances and falls of by about 30% at the largest viewing distance. Observer performance for detection of 1.0 cm nodules, however, improves as the viewing distance is increased from 46 to 91 cm and then decreases at larger viewing distances.

Humans↗
PubMedDate not supplied

Directed versus free search for nodules in chest radiographs.

Nodule detection in chest radiographs was compared under free-search and directed-search conditions. In directed search, the observer was told which quadrant of the chest to examine. Each of five observers read a test series of 96 radiographs seven times. Results were analyzed in terms of signal detection theory. NOdule detection was found to be significantly more accurate in directed search than in free search. The results were compared with those of previous experiments which found no such effect or an opposite effect. The present results do not support a previously hypothesized preattentive visual mechanism with better detection capabilities than focused visual attention.

Humans↗