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The Radiofrequency Field Distribution Surrounding Coils for Intrauterine Diagnostic Procedures: I. Geometrical Factors

The absorption of radio frequency energy emitted by a small intrauterine coil has been used for intrauterine scanning in order to localize intrauterine pathology, especially cancer. In order to improve the method the distribution of RF field intensities around coils of different geometries has been measured. Ringshaped coils have longer axial effective fields than other coil geometries, probably allowing diagnosis of more deeply lying processes. Still deeper processes may be reached by two‐coil systems of special design. The RF absorption has been shown to follow the squared value of RF field intensity.