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Nils-Gunnar Holmer

Ulf Ulmsten

Kjell Lindstrom

Per O Borjesson

Birger Astedt

Bengt Mandersson

Kurt Bernstein

Lars Jacobsson

Soren Mattsson

Goran Salomonsson

Method and apparatus for generating short ultrasonic echo pulses

An apparatus for determining the depth position of venous thrombi in the lower extremities utilizes a unique property in .sup.125 I. This resides in the fact that in approximately half of all disintegrations, two photons are emitted simultaneously. These two coincident photons have, like separately emitted photons, an energy of approximately 28 keV. A scintillation detector perceives the coincidently emitted photons as one photon of an energy of 56 keV. The quotient between the number of separately emitted photons and the number of coincident photons may thus be determined. This quotient constitutes a parameter which is greatly dependent on the distance between the detector and the source of radiation, whereby there is obtained a possibility of determining the depth of the thrombus.

Method for localizing a region in the human body, in particular venous

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S Lund, Sweden

Nils-Gunnar Holmer