This book is a supplement to Volume V/I in the present series, Diag-
nostie Radiology, published in 1962. Despite the relatively long period
of time whieh has elapsed sinee its publieation, that eomprehensive vol-
urne is still essentially valid, even though further developments have
of course oeeurred in eertain fields. In reeent years the developments
in nuclear medieine and ultrasonie teehniques have led to a number of
new methods of medieal investigation, whieh, in different ways,
eomplement diagnostie radiology. Funetional disorders of the urinary
traet ean often be detected by means of radioiso- topes. Sinee
morphologie ehanges are almost always preeeeded by fune- tional
disturbanees, radionuclide teehniques in many instanees produee an
earlier diagnosis than radiography. Disturbances of renal blood flow,
slight ureterie obstruetion, and ureterie reflux are examples of
pathologie states whieh ean be deteeted early by the y scintillation
eamera. Bone seans, Le., imaging of the skeletal system using a
radionuclide, are used extensively to diagnose bone metastases now that
it has been demonstrated that such metastatie growths are identified
both earlier and with greater aeeuraey by scintigraphy than by
radiographie teeh- niques.