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Abstract
A technique for combined quantitative bone and pertechnetate (perfusion) scintigraphy of the sacroiliac joints is described. The method is based on localization of the joints in the image obtained after the injection of a small dose of bone-seeking technetiated methyldi-phosphonate. This image is later subtracted from the image obtained after the injection of pertechnetate. This combination of methods is believed to constitute a more accurate way of localizing the sacroiliac joints than the previously used method, based on fluoroscopy. A minor comparison between these two ways of localising the joints is reported too. It is possible that the combination of quantitative bone and pertechnetate scintigraphy will improve the overall sensitivity of the scintigraphic method.