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Power Doppler

Previous studies of tumor blood vessel response to radiation have relied upon the clearance of Xe and the quantity of RBCs (Cr-59) within tumors following treatment with radiation (3,6,8). Currently available methods allow direct, longitudinal observation of tumor blood volume and blood flow (10,11). More recent models include the tumor vascular window (11), power Doppler sonography (10), and histologic evaluation of tumor blood vessels (12,13). These models permit characterization of the dose-dependent response in tumor blood vessels. [Pg.360]

Power Doppler sonography displays the amplitude of the Doppler signal but lacks the velocity and directional information present in frequency-based color Doppler sonography (10). However, power Doppler is more sensitive in the depiction of tumor vascularity (14-16), specifically within small tumor vessels (10,17). The hind limb tumor model and power Doppler can be utilized to measure the response of tumor blood vessels to radiation, providing longitudinal assessment of microvascular response within the same tumor without the need to section tumors for histology at various time intervals. [Pg.360]

Fig. 1. GL261 and B16F0 tumor cell lines were pelleted and implanted into the hind limb of C57BL6 mice. Tumors were grown to diameters ranging from 0.7-1.1 cm and were irradiated. The vasculature of tumors was analyzed by power Doppler analysis. Shown are representative images acquired from power Doppler imaging of G1261 hindlimb tumors after 3 and 6 Gy irradiation. Fig. 1. GL261 and B16F0 tumor cell lines were pelleted and implanted into the hind limb of C57BL6 mice. Tumors were grown to diameters ranging from 0.7-1.1 cm and were irradiated. The vasculature of tumors was analyzed by power Doppler analysis. Shown are representative images acquired from power Doppler imaging of G1261 hindlimb tumors after 3 and 6 Gy irradiation.
Fig. 2. Power weighted pixels Doppler (PWPD). Bar graph showing the change in GL261 and B1F60 tumor vascularity as measured by power Doppler after irradiation. The changes are compared with the vascularity of tumors measured immediately before irradiation. Fig. 2. Power weighted pixels Doppler (PWPD). Bar graph showing the change in GL261 and B1F60 tumor vascularity as measured by power Doppler after irradiation. The changes are compared with the vascularity of tumors measured immediately before irradiation.
Fig. 10. Representative power Doppler US images from (A) tumors in the control group, (B) tumors treated with TNF, (C) tumors treated with radiation therapy, and (D) tumors receiving combined TNF and radiation therapy. Depicted blood vessels are greatest in the periphery of the tumors (arrowheads in A). Treatment with radiation alone or TNF alone results in a decrease in depicted blood vessels. Combined therapy results in a greater decrease in depicted blood vessels. Fig. 10. Representative power Doppler US images from (A) tumors in the control group, (B) tumors treated with TNF, (C) tumors treated with radiation therapy, and (D) tumors receiving combined TNF and radiation therapy. Depicted blood vessels are greatest in the periphery of the tumors (arrowheads in A). Treatment with radiation alone or TNF alone results in a decrease in depicted blood vessels. Combined therapy results in a greater decrease in depicted blood vessels.
Lencioni R, Pinto F, Armillotta N, Bartolozzi C. Assessment of tumor vascularity in hepatocellular carcinoma comparison of power Doppler US and color Doppler US. Radiology 1996 201 353-358. [Pg.375]

B artolozzi C, Lencioni R, Paolicchi A, et al. Differentiation of hepatocellular adenoma and focal nodular hyperplasia of the liver comparison of power Doppler imaging and conventional color Doppler sonography. EurRadiol 1997 7 1410-1415. [Pg.375]

Hosoki T, Mitomo M, Chor S, et al. Visualization of tumor vessels in hepatocellular carcinoma power Doppler compared with color Doppler and angiography. Acta Radiol 1997 38 422-427. [Pg.375]

Donnelly EF, Geng L, Wojcicki WE, et al. Quantified power Doppler US of tumor blood flow correlates with microscopic quantification of tumor blood vessels. Radiology 2001 219 166-170. [Pg.378]

Cohen LS, Escobar PF, Scharm C, Glimco B, Fishman DA. Three-dimensional power Doppler ultrasound improves the diagnostic accuracy for ovarian cancer prediction. Gynecol Oncol 2001 82(l) 40-48. [Pg.182]

Cedrone, A., Pompili, M., Sallustio, G., Lorenzelli, G.P., Gasbarrini, G., Rapaccini, G.L. Comparison between color power Doppler ultrasound with echo-enhancer and spiral computed tomography in the evaluation of hepatocellular carcinoma vascularization before and after ablation procedures. Amer. J. Gastroenterol. 2001 96 1854-1859... [Pg.138]

Sumi, S., Yamashita, Y., Mitsuzaki, K., Yamamoto, H., Urata, J., Nishi-haru, T., Takahashi, M. Power Doppler Sonography assessment of tumor recurrence after chemoembolization therapy for hepatocellular carcinoma. Amer. J. Roentgenol. 1999 172 67—71... [Pg.140]

Golli, M., Kriaa, S., Said, M., Belguith, M., Zbidi, M., Saad, J., Nouri, A., Ganouni, A. Intrahepatic spontaneous portosystemic venous shunt value of color and power Doppler sonography. X. Clin. Ultrasound 2000 28 47-50... [Pg.746]

Tohara, K., Sakaguchi, S., Hatono, N., Mitsuyasa, Y., Miyajima, Y., Tanaka, M., Yao, T. Usefulness of power Doppler imaging in the diagnosis of small focal nodular hyperplasia of the liver. Hepatol. Res. 1999 14 26-34... [Pg.768]

Gritzmann, N. Small hepatocellular carcinomas in patients with liver cirrhosis potential and limitations of contrast-enhanced power Doppler sonography. Eur. X Gastroenterol. Hepatol. 2003 15 881-883... [Pg.803]

Imamura, M., Shiratori, Y., Shiina, S., Sato, S., Obi, S., Okudaira, T., Teratani, T., Kato, N., Akahane, M., Ohtomo, K., Minami, M., Omata, M. Power Doppler sonography for hepatocellular carcinoma factors affecting the power Doppler signals of the tumors. Liver 1998 18 427-433... [Pg.803]

Morimoto, Y., Kubo, S., Sbuto, T., Tanaka, H., Hirohashi, K., Yamamoto, T., Yamada, R., Kinoshita, H. Power Doppler ultrasonographic diagnosis of small hepatocellular carcinoma. Dig. Surg. 2002 19 379-387... [Pg.804]

Ascenti, G., Zimbaro, G., Mazziotti, S., Visalli, C., Lamberto, S., Scri-bano, E., Gaeta, M. Intrahepatic portal vein aneurysm three-dimensional power Doppler demonstration in four cases. Abdom. Imag. 2001 26 520-523... [Pg.841]

Arger P H, Sehgal C M, Pugh C R et ai 1999 Evaiuation of change in blood flow by contrast-enhanced power Doppler imaging during norepinephrine-induced renal vasoconstriction. Journal of Ultrasound in Medicine 18 843-851... [Pg.213]

Cohen, L.S. Escobar, P.R Scharm, C. Glimco, B. Fishman, D.A. Three-dimensional Power Doppler Ultrasound Improves the Diagnostic Accuracy for Ovarian Cancer Prediction. Gynecol. Oncol. 82,40-48 (2001). [Pg.120]

In addition to B-mode sonography flow-depended techniques such as color-coded duplex sonography or power Doppler sonography can be employed in liver imaging. Although these techniques are used in most cases to obtain information about hepatic vasculature, it has been reported that they also provide additional information on the characterization of focal liver lesions based on their perfusion patterns [39]. [Pg.16]

Figwe 3 Power Doppler imaging of a rabbit kidney preinjection (a) and postinjection (b) of 0.15 ml kg" PLGA UCA. After injection, the vasculature and contours within the kidney (boxed) become enhanced. [Pg.535]

Frequently, a high-resolution transducer is used to visualize the appendix during graded compression. In many cases, the appendiceal region can be seen with transabdominal 7.5-MHz transducers. The use of colour- or power Doppler may be useful however, use of the Doppler methods is not mandatory. [Pg.5]

Since fistula wall is characterized by granulation tissue and neoangiogenesis, it may be easily recognized at US by detecting intramural blood flow using power Doppler or i.v. contrast enhanced US (Maconi etal.2002). [Pg.68]

Maconi G, Sampietro GM, Cristaldi M et al (2001) Preoperative characteristics and postoperative behaviour of bowel wall on risk of recurrence after conservative surgery in Crohn s disease. A prospective study. Ann Surg 233 345-352 Maconi G, Sampietro GM, Russo A et al (2002) The vascularity of internal fistulae in Crohn s disease an in vivo power Doppler ultrasonography assessment. Gut 50 496-500... [Pg.72]

Fig. 8.9). To obtain confirmation of the pseudopol-ypoid nature of the intestinal content, colour-power Doppler can be used to assess the blood flow within the echogenic material. [Pg.78]

Heyne R, Rickes S, Bock P, Schreiber S, Wermke W, Lochs H (2002) Non-invasive evaluation of activity in inflammatory bowel disease by power Doppler sonography. Z Gastroenterol 40 171-175... [Pg.83]

Typical metastatic liver tumors have a thick hypoechoic rim with a relatively hyperechoic center, known as the huU s-eye sign (Fig. 16.10a) however, this finding cannot he applied to all metastatic liver tumors. Penetration of the normal vascular structure through the tumor proven hy color/power Doppler, ring-shaped enhancement in the arterial phase, and loss of enhancement in the postvascular phase as determined hy contrast ultrasound, are helpful findings for the diagnosis of metastatic liver tumors. [Pg.141]

Bowel Sonography (B-Mode, Doppler and Power Doppler Sonography) 169... [Pg.169]

See other pages where Power Doppler is mentioned: [Pg.212]    [Pg.360]    [Pg.368]    [Pg.369]    [Pg.373]    [Pg.232]    [Pg.163]    [Pg.196]    [Pg.753]    [Pg.1304]    [Pg.536]    [Pg.11]    [Pg.53]    [Pg.68]    [Pg.72]    [Pg.72]    [Pg.111]    [Pg.114]    [Pg.138]   


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