Contrast-enhanced power Doppler imaging: comparison with scintigraphic phases of revascularization of the femoral head in Legg-Calvé-Perthes disease.
The authors evaluated the usefulness of an ultrasound contrast agent (SHU 508A) to help identify different scintigraphic phases of revascularization of the femoral head in children with Legg-Calvé-Perthes (LCP) disease. Eighteen unenhanced and contrast-enhanced power Doppler images and scintigrams of the pathologic hip in 18 children with LCP disease were compared. The scintigraphic stages of Conway's classification for LCP disease (stage A, recanalization; stage B, neovascularization) were compared with the degree of vascularity and mean peak enhancement ratios obtained from analysis of Doppler sonograms. Qualitatively, the patient's age (< or = or >7 years old) at the time of examination had a significant effect on the degree of vascularity visualized on postcontrast ultrasound images according to the scintigraphic stages. Quantitatively, there were no differences for overall mean peak enhancement ratios between stages A and B. Power Doppler ultrasound increased visualization of Doppler signals significantly but did not help in differentiating scintigraphic phases.
Doria
Andrea S
AS
University of São Paulo, São Paulo, Brazil. andrea.doria@sickkids.ca
Guarniero
Roberto
R
De Godoy
Rui M
RM
Buchpiguel
Carlos
C
Modena
Marcelo
M
Cunha
Fabiano G
FG
Luzo
Carlos
C
Molnar
Laszlo J
LJ
Sapienza
Marcelo T
MT
Cerri
Giovanni G
GG
D002648:Child; D002675:Child, Preschool; D003287:Contrast Media; D005260:Female; D005270:Femur Head / Q000098:blood supply*; D006801:Humans; D007873:Legg-Calve-Perthes Disease / Q000000981:diagnostic imaging*; D008297:Male; D018919:Neovascularization, Physiologic / Q000502:physiology*; D011336:Probability; D011856:Radiographic Image Enhancement / Q000379:methods*; D011877:Radionuclide Imaging / Q000379:methods; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D018709:Statistics, Nonparametric; D013667:Technetium; D018615:Ultrasonography, Doppler, Color / Q000379:methods*
D003287:Contrast Media; D013667:Technetium