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Power Doppler Ultrasonography (power + doppler_ultrasonography)

Distribution by Scientific Domains
Medical Sciences85%

Selected Abstracts

Changes in vascularity and blood volume as a result of photodynamic therapy can be assessed with power Doppler ultrasonography

LASERS IN SURGERY AND MEDICINE, Issue 3 2006
DECVDI, Stefanie Ohlerth Dr. Med.Vet.
Abstract Background and Objectives One principal mechanism of photodynamic therapy (PDT) in tumors is destruction of tumor-associated vasculature. In the present study, the vascular effects of PDT in tumors were investigated with power Doppler ultrasonography. Materials and Methods Seven cutaneous squamous cell carcinomas in cats were treated. Tumors were examined via power Doppler ultrasonography before, 5 minutes, 1 hour, and 24 hours after PDT. Images were digitized for computer-aided assessment of vascularity and blood volume. Results Mean baseline tumor vascularity and blood volume were moderate. During PDT, a significant decrease in vascularity and blood volume was noted. Lowest values were found 24 hours after PDT. Conclusions Power Doppler ultrasonography represents a non-invasive modality to successfully monitor the vascular effects and thus, treatment efficacy, of PDT. Lasers Surg. Med. 38:229,234, 2006. © 2006 Wiley-Liss, Inc. [source]

Hepatobiliary and pancreatic: Extended directional power Doppler ultrasonography in liver transplantation

JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, Issue 8 2007
J Kaneko
[source]

Changes in vascularity and blood volume as a result of photodynamic therapy can be assessed with power Doppler ultrasonography

LASERS IN SURGERY AND MEDICINE, Issue 3 2006
DECVDI, Stefanie Ohlerth Dr. Med.Vet.
Abstract Background and Objectives One principal mechanism of photodynamic therapy (PDT) in tumors is destruction of tumor-associated vasculature. In the present study, the vascular effects of PDT in tumors were investigated with power Doppler ultrasonography. Materials and Methods Seven cutaneous squamous cell carcinomas in cats were treated. Tumors were examined via power Doppler ultrasonography before, 5 minutes, 1 hour, and 24 hours after PDT. Images were digitized for computer-aided assessment of vascularity and blood volume. Results Mean baseline tumor vascularity and blood volume were moderate. During PDT, a significant decrease in vascularity and blood volume was noted. Lowest values were found 24 hours after PDT. Conclusions Power Doppler ultrasonography represents a non-invasive modality to successfully monitor the vascular effects and thus, treatment efficacy, of PDT. Lasers Surg. Med. 38:229,234, 2006. © 2006 Wiley-Liss, Inc. [source]

Anatomy and ultrasonography of the normal kidney in brown lemurs: Eulemur fulvus

AMERICAN JOURNAL OF PRIMATOLOGY, Issue 8 2009
Fidiniaina Raharison
Abstract The purpose of this study is to describe the anatomy and obtain echographic measurements of normal kidneys in brown lemurs (Eulemur fulvus). The anatomical findings show that brown lemur kidneys are comparable to those of rats except for an elongated papilla. The kidneys of 16 (7 females and 9 males) lemurs were examined with two-dimensional and power Doppler ultrasonography under general anesthesia. Morphometrically, the left and right kidney surface areas are comparable (3.29 and 3.51,cm2). Kidney area has a significant linear correlation with body weight. Echo-Doppler findings show that the mean renal arterial blood flow speeds for the left and right kidneys are comparable (0.70 and 0.73,m/s). However, flow speed is higher in the male (0.79,m/s) than in the female (0.60,m/s). The renal arterial diameters are between 1.0 and 1.8,mm. The fact that anesthesia can have hemodynamic effects on renal vasculature should be taken into consideration when assessing these echographic results. Am. J. Primatol. 71:647,653, 2009. © 2009 Wiley-Liss, Inc. [source]

The usefulness of power Doppler ultrasonography for diagnosing prostate cancer: histological correlation of each biopsy site

BJU INTERNATIONAL, Issue 9 2000
O.E. Franco
Objective To correlate the findings of power Doppler ultrasonography (PDUS) of the prostate with those of site-specific transrectal ultrasonography (TRUS)-guided biopsy. Patients and methods The study comprised 28 patients referred to our institution for TRUS-guided prostate biopsy because of an elevated PSA level and/or abnormal digital rectal examination. PDUS findings were graded 0, 1 or 2; grades 0,1 were considered as negative and grade 2 as positive. The blood volume of each biopsy site was also determined using the mean number (MN) value that represents the average vascularity in a 5-mm square sample. PDUS values were correlated with the histological findings of 147 biopsies with 19 focal lesions. Results Grade 2 was assigned to 19 sites, grade 1 to 52 sites, and grade 0 to 76 sites. Fourteen of the 19 PDUS findings of grade 2 sites revealed carcinoma and five were grade 1. Ten of 35 TRUS-positive sites were carcinomas, three benign prostatic hyperplasia (BPH) and 22 normal. The MN value for prostatic carcinoma was 4.33, for BPH 11.7 and for normal tissue 4.7. The overall sensitivity of PDUS was 74%, the specificity 96% and the positive predictive value 74%. Conclusions Because TRUS alone cannot detect all cancers, PDUS should be used routinely in all patients undergoing TRUS-guided biopsy, to improve the diagnostic yield of prostate cancer. [source]