Angular-modulation techniques automatically
adjust the tube current for each
projection angle to the attenuation of the
patient to minimize x-rays in projection
angles (eg, anteroposterior or posteroanterior
angles are less important than are
lateral projections because the former
cause less beam attenuation and hence
are associated with less noise) that are
less important with regard to reducing
the overall noise content (Fig 1). In phantom
studies in which an online angularmodulation
technique was compared
with the previous angular-modulation
technique, a substantially greater radiation