title: [Efficacy of integrated backscatter imaging by acoustic densitometry for identifying ultrasonic tissue characterization of left ventricular thrombus: two case reports].
abstract: Echocardiography demonstrated a high echoic lesion(6 x 5 mm) in the apex of the left ventricle of a 72-year-old man(Case 1) and similar lesions(7 x 6 mm and 4 x 3 mm) in the apex of the left ventricle of a 60-year-old man(Case 2). The amplitude of cyclic variation of integrated backscattering of the high echoic lesions was measured by acoustic densitometry to be lower than that of the myocardium in Case 1, but similar to that of the myocardium in Case 2. Contrast echocardiography detected the perfusion defect of the high echoic lesion in Case 1, but not in Case 2 in the apical four-chamber view. These findings showed that the high echoic lesion indicated thrombus in Case 1, and papillary muscle in Case 2. Measurement of the amplitude of the time intensity curve with contrast echocardiography showed that the amplitude of thrombus was different from that of myocardium. This method is useful for ultrasonic tissue characterization.
authors.affiliation: Division of Cardiovascular Medicine, Murakami Memorial Hospital, Asahi University, Hashimoto-cho 3-23, Gifu, Gifu 500-8523.
authors.forename: Susumu
authors.initials: S
authors.lastname: Nishikawa
authors.forename: Shuji
authors.initials: S
authors.lastname: Katoh
authors.forename: Hiroki
authors.initials: H
authors.lastname: Takada
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tsubakimoto
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Yuba
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Adachi
authors.forename: Kazuki
authors.initials: K
authors.lastname: Ito
mesh_terms: D000368:Aged; D003720:Densitometry / Q000379:methods; D004452:Echocardiography / Q000379:methods*; D006331:Heart Diseases / Q000000981:diagnostic imaging*; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D013927:Thrombosis / Q000000981:diagnostic imaging*