NONCONVENTIONAL ULTRASONOGRAPHY (POWER SPECTRUM ANALYSIS) IN THE MANAGEMENT OF RETINOBLASTOMA

The differential diagnosis among the diseases that may simulate retino blastoma is supported by several techniques; however, none of them can give an undeniable answer. In the authors' opinion the tissue charact erization by power spectrum analysis of the radiofrequency ultrasound data may play an important role in the backscattered signal spectrum w hile being sensitive to the spectral shift trend. In order to evaluate the patterns of regression and quiescence of retinoblastoma foci afte r conservative treatment the authors try to create a model of tissue c haracterization that provides information not available in conventiona l A & B scan ultrasonography about cell type, vascularization and necr osis.