Introduction With specific combinations of B0-field, B1-field, and gradient field, peripheral signals outside the prescribed field of view (FOV) can fold back onto the image, resulting in a bright spot, a series of spots, a band, or a “feather-like” artifact along the phase encoding direction. In a fast spin echo (FSE) image, this type of artifact has been termed as cusp artifact [1,2], annefac...

OBJECTIVE To evaluate orthopedic metal artifact reduction algorithm (O-MAR) in CT orthopedic metal artifact reduction at different tube voltages, identify an appropriate low tube voltage for clinical practice, and investigate its clinical application. MATERIALS AND METHODS The institutional ethical committee approved all the animal procedures. A stainless-steel plate and four screws were impl...

We propose a novel metal artifact reduction method based on a fractional-order curvature driven diffusion model for X-ray computed tomography. Our method treats projection data with metal regions as a damaged image and uses the fractional-order curvature-driven diffusion model to recover the lost information caused by the metal region. The numerical scheme for our method is also analyzed. We us...

Introduction: Metal-on-metal (MOM) hip resurfacing implants were predicted to be suitable for young, active patients (1). However, there are indications that the MOM-implants fail more frequently than traditional implants (2), possibly caused by an aseptic lymphocytic vasculitis-associated lesion in the tissues surrounding the implant (3). The diagnosis of these lesions by MRI would be facilita...

PURPOSE To examine a photoelectric artifact associated with the ERG-jet corneal contact lens electrode (Universe SA, La Chaux-de-Fons, Switzerland). METHODS An artifact associated with the ERG-jet, gold foil corneal contact lens electrode was reproduced in vitro and in vivo using 50 msec light flashes. In vitro responses were examined using light flashes that varied in intensity, duration, an...

BACKGROUND An optimal metal artifact reduction (MAR) technique is needed for a reliable and accurate image-based diagnosis. PURPOSE Using a 320-row scanner, we compared the dual-energy computed tomography (CT)-based monochromatic and the single-energy metal artifact reduction (SEMAR) techniques for CT venography (CTV) to identify the better imaging method for diagnosing deep vein thrombosis (...

The dosimetric impact of orthopedic metal artifact reduction (O-MAR) on spine SBRT patients has not been comprehensively studied, particularly with spinal prostheses in high-dose gradient regions. Using both phantom and patient datasets, we investigated dosimetric effects of O-MAR in combination of various metal locations and dose calculation algorithms. A physical phantom, with and without a t...

INTRODUCTION Intervertebral spacers are made of different materials, which can affect the postfusion magnetic resonance imaging (MRI) scans. Susceptibility artifacts, especially for metallic implants, can decrease the image quality. This study aimed to determine whether magnesium as a lightweight and biocompatible metal is suitable as a biomaterial for spinal implants based on its MRI artifacti...

Evaluation of painful total knee arthroplasty can be clinically difficult, and traditional imaging techniques such as conventional radiographs, arthrography, and bone scintigraphy are limited by poor contrast resolution and specificity. Traditional magnetic resonance imaging techniques often are nondiagnostic because of significant metal artifact. Forty-one patients (46 knees) had magnetic reso...