|
Results:
For the evaluation of the ultrasonic image one has to keep in mind that the lateral local assignment may be inaccurate because the cross section image was taken hand-guided. Of course the precise position of the tumor can be palpated. On the other hand the depth and size of the tumor are determined only by the ultrasound image. The image of the breast model can be somewhat irritating because the outer form of breast is displayed downwards. This echo is produced by the plain back side of the model and therefore the distance to the surface is displayed, respectively. In the upper left area the tumor is recognizable as a weak reflection. However the imaging of the sound shadow behind the tumor is more clear. The sound impedance of the tumor tissue is only slightly different from the surrounding tissue, however the attenuation is clearly higher. For the sound velocity of the B-image intentionally the double velocity of water (3000 m/s) has been chosen in order to enhance the depth resolution in the presentation. All depth numbers must be diveded by two. So the tumor exists in a depth of about 10 mm and has an extension of circa 20 mm.
|
