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Radiology, Vol 198, 699-706, Copyright © 1996 by Radiological Society of North America

ARTICLES

Neural networks in ventilation-perfusion imaging

RE Fisher, JA Scott and EL Palmer
Department of Radiology, Massachusetts General Hospital, Boston 02114, USA.

PURPOSE: To optimize the performance of artificial neural networks in the prediction of pulmonary embolism from ventilation-perfusion (V-P) scans. MATERIALS AND METHODS: Neural networks were constructed with a set of V-P scan criteria that included sharpness and completeness of perfusion defects and involved quantification of abnormalities by using a continuous numeric scale. Several network parameters were systematically varied. Networks were trained with 150 cases and tested with 30 different cases. Findings were compared with those of pulmonary angiography. RESULTS: Networks capable of performing as well as experienced nuclear medicine physicians could be constructed with few V- P scan features. A brief training period was optimal (50-100 iterations). Further training diminished network performance. CONCLUSION: Effective neural networks can be constructed by using a limited number of unconventional V-P scan features. Several parameters can be adjusted to optimize performance.


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Am. J. Roentgenol., October 1, 2002; 179(4): 869 - 874.
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