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1. US6595925 - In or relating to contrast agents

Office
United States of America
Application Number 09503165
Application Date 14.02.2000
Publication Number 6595925
Publication Date 22.07.2003
Grant Number 6595925
Grant Date 22.07.2003
Publication Kind B1
IPC
A61B 8/14
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
8Diagnosis using ultrasonic, sonic or infrasonic waves
13Tomography
14Echo-tomography
A61K 49/00
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
KPREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
49Preparations for testing in vivo
A61K 49/22
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
KPREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
49Preparations for testing in vivo
22Echographic preparations; Ultrasound imaging preparations
CPC
A61K 49/223
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
KPREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
49Preparations for testing in vivo
22Echographic preparations; Ultrasound imaging preparation ; Optoacoustic imaging preparations
222characterised by a special physical form, e.g. emulsions, liposomes
223Microbubbles, hollow microspheres, free gas bubbles, gas microspheres
Applicants Amersham Health AS
Inventors Ă˜stensen, Jonny
Eriksen, Morten
Tornes, Audun
Frigstad, Sigmund
Priority Data 9717588 19.08.1997 GB
Title
(EN) In or relating to contrast agents
Abstract
(EN)

Ultrasound imaging using gas microbubble-containing contrast agents may be performed in the recirculating phase following admixture of the contrast agent with the blood pool, thereby prolonging the useful imaging time window compared to that conventionally obtained during the backscatter signal peak resulting from first pass of a contrast agent bolus. The length of the time window may further be increased by imaging at ultrasound frequencies of 2 MHz or less, particularly by harmonic imaging at transmit frequencies less than the resonance frequencies of the gas microbubbles.