[Non-linear ultrasound imaging].
The recent introduction of non-linear imaging in ultrasound diagnosis could improve image quality by resolving some problems in technically difficult patients allowing a better conspicuity in identification of subtle lesions. Tissue harmonics are generated while the transmitted pulse propagates through tissue. The formation of image by utilising the harmonic signals implies the suppression of fundamental frequency in the received signal. This is achieved by two major processes filtering and pulse inversion imaging. The non-linear properties of contrast agents reinforce the intensity of harmonic signals which could be detected in precise conditions of acoustic power for a non-destructive or destructive imaging. The introduction of this new imaging modality opens new way in ultrasound imaging with precise protocols of acquisition or sequences and possibly in therapy in the near future.
Tranquart
F
F
Service de Médecine Nucléaire et Ultrasons-CHU Bretonneau-37044 Tours Cédex. Service Radiologie-CHU Pellegrin-33000 Bordeaux. tranquart@med.univ-tours.fr
Grenier
N
N
D003287:Contrast Media; D004452:Echocardiography; D006801:Humans; D007089:Image Enhancement; D017711:Nonlinear Dynamics; D014463:Ultrasonography; D018608:Ultrasonography, Doppler; D018615:Ultrasonography, Doppler, Color
D003287:Contrast Media