Ultrasound provides anatomical sectional pictures of organs and lesions on the basis of which optimum direction and depth of puncture can be established. The use of a specially designed transducer with a central canal through which the needle is introduced ensures the maintenance of the correct direction during the procedure. A number of areas of applicability are discussed and it is found that as an aid in percutaneous puncture ultrasound has essential advantages when compared to radiology.
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Holm et al. (1973) studied this question.
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