IMMERSION ULTRASONIC BRAIN EXAMINATION: 360 DEGREES COMPOUND SCAN,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED PHYSICS
Pagination or Media Count:
The usual clinical methods of visualizing brain structures employ X-rays together with means of improving contrast. In ventriculography, the cerebral fluid is replaced by air and in angiography a radio-opaque substance is injected into the bloodstream. Neither method is simple nor considered entirely safe. Electroencephalography and isotope techniques have also been used, to provide additional information about brain disorders. In electroencephalography, the distribution and waveform of brain potentials are studied and in isotope techniques, the distribution of isotope concentration. Ultrasound provides a simple and convenient means particularly suited to early diagnosis and large-scale screening which can also be used as a supplementary diagnostic tool. Work in this sphere has concentrated recently on techniques to obtain a two-dimensional picture by superimposition of single echoes. The hope of many workers is that eventually it will be possible to improve resolution and sensitivity sufficiently to obtain a crosssectional picture of the head that will not only supplement, but replace, other diagnostic means.