Zusammenfassung
Ziel: Vergleich der Standard-Powerdoppler- und des Colour-Harmonic-Imaging-Modus bei Verwendung
verschiedener Schallsondenfrequenzen und von Ultraschallkontrastmittel hinsichtlich
der Visualisierung der Mammatumorvaskularisation und ihres Einflusses auf die diagnostische
Treffsicherheit. Material und Methode: Bei 20 Patientinnen (x = 43,6 ± 11,7 Jahre) mit Malignitätsverdacht der Mamma wurden
die Läsionsvaskularisation und die konsekutive Dignitätseinschätzung powerdopplersonographisch
untersucht. Für die Dignitätseinschätzung wurden das quantitativ erkennbare Vaskularisationsausmaß
(„Percentage Vessel Area”, PVA) und die qualitativ erkennbare Tumorgefäßarchitektur
analysiert. Verglichen wurden folgende Powerdopplermodi: 9-MHz- bzw. 12-MHz-Standard-Modus
vor und nach Kontrastmittelgabe (KM) sowie 9-MHz-Colour-Harmonic-Imaging-Modus (CHI)
nach Kontrastmittelgabe. Ergebnisse: Die quantitative Tumorgefäßdarstellung (= PVA) zeigte eine Zunahme von durchschnittlich
2,2 ± 2,9 % (9-MHz-Standard nativ) über 4,8 ± 4,1 % (12-MHz-Standard nativ), 9,7
± 15,3 % (9-MHz-Standard KM), 17,4 ± 20,0 % (9-MHz-CHI-KM) auf 19,4 ± 14,8 % (12-MHz-Standard-KM).
Die Erkennbarkeit der Tumorgefäßarchitektur war am deutlichsten bei Verwendung des
12-MHz-Standard-KM-Modus, unmittelbar gefolgt vom 9-MHz-CHI-KM-Modus. Die Treffsicherheit
zeigte jedoch keine direkte Korrelation mit der Verbesserung der Tumorgefäßvisualisation.
Die höchste Treffsicherheit erreichten mit 95 % der 9-MHz-CHI-KM-Modus (Kriterium
„PVA”) bzw. der 9-MHz-KM-Standard-Modus (Kriterium „Tumorgefäßarchitektur”), während
die 12-MHz-Sonden insuffiziente Treffsicherheiten bei niedrigen Spezifitäten lieferten.
Schlussfolgerung: Während die quantitativ und qualitativ beste Darstellung der Tumorvaskularisation
mittels des 12-MHz-Standard-KM-Modus erzielt wurde, erbrachten der 9-MHz-Standard-KM-
und der 9-MHz-CHI-KM-Modus die treffsicherste Dignitätseinschätzung. Die Vaskularisationsdarstellung
und partiell auch die Treffsicherheit wird durch Einsatz von Colour-Harmonic-Imaging
bei konstanter Schallsondenfrequenz signifikant gesteigert.
Abstract
Purpose: To compare the ability of standard power Doppler and color harmonic imaging for visualising
breast tumor vascularity using ultrasound probes of various frequencies, and to evaluate
the influence on diagnostic accuracy using ultrasound contrast agent. Materials and Methods: Twenty patients (x = 43.6 ± 11.7 years) with suspected malignancy of the breast underwent
power Doppler to evaluate vascularity and to offer a differential diagnosis of the
lesion. Two criteria were used for differential diagnosis: The quantitative extent
of vascularity (“percentage vessel area”, PVA) and the qualitative assessment of vascular
architecture. The following power Doppler modes were compared in every patient: Plain
and enhanced (Levovist®) 9 MHz and 12 MHz standard power mode and enhanced 9 MHz color
harmonic imaging-(CHI). Results: The PVA increased from a mean of 2.2 ± 2.9 % (9 MHz standard plain) via 4.8 ± 4.1
% (12 MHz standard plain), 9.7 ± 15.3 % (9 MHz standard enhanced), 17.4 ± 20.0 % (9
MHz CHI enhanced) up to 19.4 ± 14.8 % (12 MHz standard enhanced). The perceptibility
of the vascular structure was best using the enhanced 12 MHz standard power mode,
immediately followed by the enhanced 9 MHz CHI mode. The improved detection of vascular
signal did not translate into improved diagnostic accuracy. The highest diagnostic
accuracy (95 %) was obtained using the enhanced 9 MHz CHI mode (criterion “PVA”) and
the enhanced 9 MHz standard power mode (criterion “vascular structure”), wherease
the 12 MHz probes delivered insufficient diagnostic accuracy and very low specificity.
Conclusion: Best quantitative and qualitative visualisation of the tumor vascularity was achieved
using the enhanced 12 MHz standard power mode. Nevertheless, the highest diagnostic
accuracy was obtained using enhanced 9 MHz standard power Doppler and enhaned 9 MHz
color harmonic imaging. The visualisation of tumor vascularity and, partially, the
diagnostic accuracy are improved significantly by color harmonic imaging without changing
the probe frequently.
Schlüsselwörter
Powerdoppler - Colour Harmonic Imaging - Ultraschallkontrastmittel - d-Galaktose -
Mammatumor
Key words
Power Doppler - color harmonic imaging - ultrasound contrast agent - d-galactose -
breast tumors
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PD Dr. med. Ralf-Jürgen Schröder
Klinik für Strahlenheilkunde, Charité, Campus Virchow-Klinikum
Augustenburger Platz 1
13353 Berlin
Phone: + 49-30-450557002
Fax: + 49-30-450557901
Email: ralf.schroeder@charite.de