High resolution ultrasonic imaging in a water bath, for example breast imaging, demands a transducer of large aperture. Such an aperture is most easily achieved by the use of mirrors. Previous such mirror systems suffered problems from reverberations between and within their component parts. Changes in the design of the system, and the use of thin metal reflectors, reduce these reverberations to an acceptable level. There is no sacrifice in the focusing performance, and losses in the system are minimized.
DriscollWalter G., Handbook of Optics - Optical Society of America, pp. 6–2, 2–3 (McGraw-Hill, New York, 1978).
2.
PigginsJ. M.NicollJ. J.McDickenW. N.KirkpatrickA. E.MuirB. A., Experience with a Versatile Ultrasonic Breast Scanner. Ultrasound Med. Biol.8, Supplement 1, 152 (1982).
3.
OlofssonS., An ultrasonic optical mirror system, Acustica13, 361–367 (1963).
4.
ThurstoneF. L.McKinneyW. M., Focused Transducer Arrays in an Ultrasonic Scanning System for Biological Tissue, in Diagnostic Ultrasonic - Proceedings of the First International Conference, University of Pittsburgh, 1965, 191–194 (Plenum Press, New York, 1966).
5.
FryW. J.LeichnerG. H.OkuyamaD.FryF. J.FryE. K., Ultrasound visualisation system employing new scanning and presentation methods, J. Acoust. Soc. Amer.44, 1324–1338 (1968).
6.
PattersonM. S.FosterF. S., The Improvement and Quantitative Assessment of B-Mode images Produced by an Annular Array/Cone Hybrid. Ultrasonic Imaging5, 195–213 (1983).
7.
Archer-HallJ. A.Ali-BashterA. I., Diffraction patterns of large aperture bowl transducers, NDT International13, 51–55 (1980).
8.
GriffingV.FoxF. E., Theory of intensity gain due to concave reflectors, J. Acoust. Soc. Amer.21, 348–351 (1949).
9.
FosterF. S.HuntJ. W., The design and characterisation of short pulse ultrasound transducers, Ultrasonics16, 116–122 (1978).
10.
WeynsA., Radiation field calculations of pulsed ultrasonic transducers, part 2: Spherical disc-and ring-shaped transducers, Ultrasonics18, 219–223 (1980).
11.
KossoffG.RobinsonD. E.GarrettW. J., Ultrasonic two-dimensional visualization for medical diagnosis, J. Acoust. Soc. Amer.44, 1310–1318 (1968).
12.
LapacewiczG.HillC. R., Choice of standard target for medical pulse-echo equipment evaluation. Ultrasound Med. Biol.1, 287–289 (1974).
13.
WeynsA., Radiation field calculations of pulsed ultrasonic transducers, part 1: Planar circular, square and annular transducers. Ultrasonics18, 183–188 (1980).
14.
BeaverW. L., Sonic nearfields of a pulsed piston radiator. J. Acoust. Soc. Am.56, 1043–1048 (1974).
15.
HuntJ. W.ArditiM.FosterF. S., Ultrasonic transducers for pulse-echo medical imaging. IEEE Trans. Biomed. EngBME-30, 453–481 (1983).
