Method for localizing a region in the human body, in particular venous thrombi, by the uptake of a radioactive substance, particularly .sup.125 I -

US4453075A · kind A · utility

Inventors

• Soren Mattsson · Lund, SE
• Nils-Gunnar Holmer · Lund, SE
• Kurt Bernstein · Hagfors, SE
• Ulf Ulmsten · Danderyd, SE
• Birger Astedt · Oxie, SE
• Lars Jacobsson

Key dates

• Filing date: Apr 4, 1983
• Grant date: Jun 5, 1984
• Expiry date: Apr 4, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G01T1/161
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

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.