Pii: S0301-5629(02)00507-0
نویسندگان
چکیده
A clinical study of the concept “wide-focus and low-pressure” extracorporal shock-wave lithotripsy (ESWL) was performed in a scientific cooperation between the Physical Institute of the University of Stuttgart and the Xixin Medical Instruments Co. Ltd. in Wuxian-Suzhou, China. In this cooperation, self-focusing electromagnetic shock-wave generator systems from the University of Stuttgart were integrated into Xixin lithotripters and installed in seven hospitals in China. A total of 297 detailed patient protocols revealed an average of 1532 shock pulses for successful treatment with no necessity for pain medication and auxiliary measures, and a stone-free rate of 86% after a follow-up of 3 months. These results are discussed in terms of the wide-focus low-pressure conditions and the mechanism of binary fragmentation by squeezing. (E-mail: [email protected]) © 2002 World Federation for Ultrasound in Medicine & Biology.
منابع مشابه
Pii: S0301-5629(01)00472-0
The nonstationary variation in the noise performance of the cross-correlation-based strain estimator due to frequency-dependent attenuation and lateral and elevational signal decorrelation have been addressed theoretically in recent papers using the strain-filter approach. In this paper, we present the experimental verification and corroboration of the nonstationary effects on the strain estima...
متن کاملPii: S0301-5629(02)00550-1
In this paper, a pilot study regarding carotid atherosclerotic plaque instability using B-mode ultrasound (US) images was carried out. The fractal dimension of plaques obtained from ten symptomatic subjects (i.e., subjects having experienced neurological symptoms) as well as from nine asymptomatic subjects, was estimated using a novel method, called the kth nearest neighbour (KNN) method. The r...
متن کاملPii: S0301-5629(02)00541-0
We evaluated a series of pathologically proven breast tumors using an image-retrieval technique for classifying benign and malignant lesions. A total of 263 breast tumors (129 malignant and 134 benign) were retrospectively evaluated. The physician located regions-of-interest (ROI) of ultrasonic images and texture parameters (contrast, covariance and dissimilarity) were used in the process of th...
متن کاملPii: S0301-5629(01)00486-0
Difficulties in location of transcranial ultrasound (US) windows and blood flow in cerebral vessels, and unambiguous detection of microemboli, have limited expansion of transcranial Doppler US. We developed a new transcranial Doppler modality, power M-mode Doppler (PMD), for addressing these issues. A 2-MHz digital Doppler (Spencer Technologies TCD100M) having 33 sample gates placed with 2-mm s...
متن کاملOn the structure of involutive, contracting and expanding negations
Characterization and new methods of generation of bijective fuzzy negations (involutive, contracting and expanding negations) are done. The approach is based on a symmetry of involutive negations with respect to the line f(x) = x; x∈ [0; 1]. Contracting and expanding negations are given by suitable de4ections from this symmetry. c © 2002 Elsevier B.V. All rights reserved.
متن کامل