An efficient measurement methodology is proposed to construct the scattering parameters of a multi-port device using a four-port vector network analyzer (VNA) without the external un-terminated ports. By using the four-port VNA, the reflected waves from the un-terminated ports could be minimized. The proposed method significantly enhances the accuracy of the S-parameters with less number of mea...

This paper concerns the reconstruction of the absorption and scattering parameters in a time-dependent linear transport equation from full knowledge of the albedo operator at the boundary of a bounded domain of interest. We present optimal stability results on the reconstruction of the absorption and scattering parameters for a given error in the measured albedo operator.

This article is part 2 of our review assessing diagnostic modalities. In the first part, we analyzed ultrasonography capabilities to detect abdominal adhesions. The second assesses effectiveness MRI and CT. CT modalities are much less commonly used in detecting adhesions than ultrasonography. has approximately same prognostic as between viscera wall, it additionally detects organs. Yet, signifi...

Computer-aided diagnosis (CAD) is becoming a prominent approach to assist clinicians spanning across multiple fields. These automated systems take advantage of various computer vision (CV) procedures, as well artificial intelligence (AI) techniques, formulate given image, e.g., computed tomography and ultrasound. Advances in both areas (CV AI) are enabling ever increasing performances CAD syste...

Background: Urinary tract infection (UTI) is known to be the most frequent bacterial in paediatric population. Objective: To determine clinical profile and etiology of complicated urinary children. Methods: This cross-sectional study was done at Department Nephrology Neonatology, National Institute Child Health, Karachi from 1st January 2022 30th June 2022. In 241 children either gender, (male ...

PURPOSE To assess the feasibility of applying trans-applicator intracavitary ultrasonography to image-guided brachytherapy for cervical cancer. MATERIAL AND METHODS For this experiment, a phantom was created and included a polyethylene tube, intended to simulate a tandem applicator, which was inserted into chicken meat and embedded in agar, along with magnetic resonance imaging (MRI)-compatib...

Abstract Background Cerebral stroke is a major source of mortality and morbidity. Duplex ultrasonography used to evaluate carotid cerebral arteries. The objectives this work are study the correlation between duplex parameters with risk factors ischemic parameter as prognostic tool stroke. Methods was conducted on 100 patients presented by acute submitted history taking, medical, neurological ex...

Ultrasonographic measurements of kidney size are useful in the practical diagnosis of kidney diseases in animals. In tigers, there is a lack of information regarding the ultrasonography methods used to measure the kidney size of the tiger. Thirty-three healthy captive tigers (Panthera tigris) were placed in lateral recumbency for ultrasonography. The measurements obtained from the ultrasonograp...

BACKGROUND AND PURPOSE Although cerebral microemboli are often detected by transcranial Doppler ultrasonography in mechanical heart valve patients, the clinical significance of such microemboli is unclear. The aim of this study was to determine the frequency and composition of cerebral microemboli in a prosthetic heart valve population and to correlate these findings to cerebrovascular symptoms...