[Detection of liver metastases--comparison of contrast--enhanced ultrasound using first versus second generation contrast agents].
OBJECTIVE
To compare detection rates for liver metastases for conventional ultrasound, US using tissue harmonic imaging (THI), echo-enhanced pulse inversion harmonic imaging using Optison and Levovist.


METHODS
In 73 patients with histologically proven gastrointestinal tumors spiral CT (S-CT), conventional US, US in the THI-mode, echo-enhanced ultrasound in the portal venous phase (ECI Optison ) and in the liver specific late phase (ECI Levovist) were performed and reviewed by blinded readers.


RESULTS
73 patients (25 female, 48 male, age 63 +/- 11) were included. S-CT detected 158 liver metastases. Conventional US detected 117, THI 119, ECI Optison 169 and ECI Levovist 166 liver metastases. Especially for small (< 2 cm) liver metastases and metastases near the diaphragm echo-enhanced ultrasound exceeded conventional US (p < 0.001). Between both echo enhancers there was no significant difference.


CONCLUSIONS
Using echo enhancers increases the ultrasound detection rate significantly. Examination in the portalvenous phase using a second generation enhancer (Optison) is equal to a late-phase examination using Levovist.
Bernatik
T
T
Medizinische Klinik I mit Poliklinik, FAU Erlangen-Nuremberg, Erlangen. thomas.bernatik@med1.imed.uni-erlangen.de
Becker
D
D
Neureiter
D
D
Hänsler
J
J
Frieser
M
M
Schaber
S
S
Hahn
E G
EG
Strobel
D
D
D003287:Contrast Media; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000556:secondary*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D014463:Ultrasonography
D003287:Contrast Media