Developments in the burgeoning field of diagnostic radiology have continued apace. Four areas that represent either subspecialties or technological advances in diagnostic radiology will be considered in this report: ultrasonography, interventional radiology, nuclear radiology, and magnetic resonance. In no sense is the exclusion of other subdisciplines and modalities (eg, pediatric radiology, computed tomography) any indication of their lack of importance or their failure to include innovative concepts.
A dramatic increase is occurring in the intraoperative utilization of ultrasound, for both inpatients and outpatients. The most important reason for this is that ultrasound is as effective as and, in many instances, more effective than other imaging modalities; furthermore, no ionizing radiation is used. In this connection, ultrasonography is particularly critical in high-risk obstetrics, in vitro fertilization, and therapy to induce fertility. In addition, the sampling of chorionic villi for chromosomal analysis and enzymatic studies is facilitated by the use of real-time