Scatterer detection in medical ultrasound imaging can be formulated as an inverse problem concerning a linear system model based on point scatterers. The applicability of different methods of regularized inversion is examined and a novel regularization scheme specifically adapted to ultrasound imaging is introduced. The results show that standard inversion methods fail in ultrasound imaging whi...

Kidney stone disease has become more common in children, but it remains non diagnosed in a significant proportion of patients, due to a lack of notable signs and symptoms. All children with colicky abdominal pain or microscopic hematuria should be examined thoroughly for urolithiasis. Patients’ histories in terms of family, medical, and drug and a thorough physical examination are require...

Intra-procedural imaging is important for guiding cardiac arrhythmia ablation. It is difficult to obtain intra-procedural correlation of thermal lesion formation with action potential (AP) changes in the transmural plane during ablation. This study tested parametric ultrasound imaging for transmural imaging of lesion and AP changes in high intensity focused ultrasound (HIFU) ablation using coro...

Early diagnosis of ovarian torsion is critical in avoiding complications and planning management. Therefore, it is important to understand and assess the imaging findings of ovarian torsion. Ultrasound is the imaging modality of choice; however, it is not always definitive and diagnosis can be challenging. MRI is a better imaging modality to evaluate for signs of complications and to arrive at ...

Veterinary diagnostic imaging has grown tremendously in the past 10 years. Digital radiology and cross sectional imaging modalities like ultrasound, computed tomography (CT), and magnetic resonance imaging (MRI) have profoundly improved our ability to diagnose many small animal diseases. Digital radiography improves image quality while at the same time making radiographs easy to make and share ...

Ultrasound imaging can be considered as an inverse scattering problem in which the unknown distribution of the material parameters mass density and compressibility is reconstructed from measurements of scattered waves on the borders around the object. Unfortunately, this inverse problem is mathematically ill-posed and nonlinear: While the wave propagation is considered linear, the mapping of ma...

OBJECTIVES To evaluate transrectal ultrasound, amplitude Doppler ultrasound, conventional T2-weighted magnetic resonance imaging, spectroscopy and dynamic contrast-enhanced magnetic resonance imaging in localizing and locally staging low-risk prostate cancer. INTRODUCTION Prostate cancer has been diagnosed at earlier stages and the most accepted classification for low-risk prostate cancer is ...

The objective of this article is to provide scientists, engineers and clinicians with an up-to-date overview on the current state of development in the area of three-dimensional ultrasound (3-DUS) and to serve as a reference for individuals who wish to learn more about 3-DUS imaging. The sections will review the state of the art with respect to 3-DUS imaging, methods of data acquisition, analys...

both 2D and 3D imaging. It is based on Synthetic TransThis paper presents a new imaging method, applicable for mil Aperture Focusing, but unlike previous approaches a new from a linear transducer array emit pulses one after another. frame is created after every pulse emission. The elements The same transducer element is used after Nxm emissions. For each emission the signals from the individual...

The development of endoscopic ultrasound (EUS) since its introduction in the early 1980s has added greatly to the quality of imaging of the gastrointestinal tract. EUS is probably the investigation of choice for local staging of several gastrointestinal tumors and evaluation of submucosal masses. In addition to well-established indications, newer applications of EUS are emerging. For example, E...