BACKGROUND AND PURPOSE Reported CT angiographic (CTA) subtraction methods are not simple, robust, or real time. We investigated a novel technique for semiautomated digital subtraction CTA of the intracranial and extracranial arteries. METHODS Thirty patients underwent precontrast (low milliampere-seconds) and postcontrast (pitch, 1.5; collimation, 1-2.5 mm) helical imaging with a vacuum-type ...

BACKGROUND AND PURPOSE MR sialography has become an alternative imaging technique for ductal salivary gland diseases. We compared the diagnostic accuracies of MR sialography and digital subtraction sialography in patients with successful completion of both examinations and benign salivary gland disorders. METHODS In a prospective study, we attempted to examine salivary glands in 80 patients w...

BACKGROUND Diagnostic subtraction radiography (DSR) is a new digital radiographic image subtraction method designed to enhance detection of crestal or periapical bone density changes and to help evaluate caries progression in teeth. In this clinical study, the performance of the DSR method was evaluated for its ability to detect periodontal bone loss and was compared with that of conventional e...

our aim in this paper is to introduce the notion of fuzzy soft near-subtraction semigroupsand fuzzy soft ideals of near-subtraction semigroups. we discuss some important properties of these new fuzzy algebraic structure and investigate some examples and counter examples.

This paper presents a new approach to robust speech recognition in noise based on spectral subtraction. A conventional spectral subtraction technique leads to nonlinear distortions of the normalized speech signals and resulting degradation of speech recognition accuracy. A new method is proposed to constrain spectral subtraction by imposing upper bounds on the estimates of the noise spectra. Tw...

In this paper we present a novel approach to force feedback in robot-assisted surgery. Haptic stimuli, consisting of both kinesthetic and cutaneous components, are substituted with cutaneous feedback only. This new approach to sensory substitution in haptics is called sensory subtraction, since it can be thought as the subtraction between the complete haptic interaction and its kinesthetic comp...

PURPOSE T1-weighted (T1W) magnetic resonance images with magnetization transfer (MT) are widely used in the evaluation of multiple sclerosis (MS) plaques. We aimed to evaluate the contribution of the subtraction technique with MT in the detection of acute MS plaques. MATERIALS AND METHODS Sixty-four patients during an MS attack were enrolled in the study. Axial T1W spin echo (SE) with MT, axi...

Background: The electrocardiogram artifact is a major contamination in the electromyogram signals when electromyogram signal is recorded from upper trunk muscles and because of that the contaminated electromyogram is not useful.Objective: Removing electrocardiogram contamination from electromyogram signals.Methods: In this paper, the clean electromyogram signal, electrocardiogram artifact and e...

A subcarrier spectral amplitude coding optical code division multiple access system using the Khazani-Syed code with Complementary subtraction detection technique is proposed. The proposed system has been analyzed by taking into account the effects of phase-induced intensity noise, shot noise, thermal noise and intermodulation distortion noise. The performance of the system has been compared wi...