24 Result(s)
within
Naotaka Nitta
English
-
Chapter
Imaging of Tissue Elastic Modulus Distribution Base on Estimated 3-D Displacement Vector
Herein, we present the 3-D displacement vector measurement method utilizing the 2-D array and the reconstruction method of tissue elastic modulus distribution using the measured 3-D displacement vector. Numeri...
-
Chapter
A New Method for 3-D Velocity Vector Measurement Using 2-D Phased Array Probe
To overcome the limitation of the conventional Doppler flowmetry, a new method of 3-D velocity vector measurement was proposed. By detecting the gradient of the weighted phase shift distribution on the receivi...
-
Article
Real time tissue elasticity imaging using the combined autocorrelation method
The elastic properties of tissues are expected to provide novel information for use in diagnosing pathologic changes in tissues and discriminating between malignant and benign tumors. Because it is hard to dir...
-
Chapter and Conference Paper
Breast Tissue Assessments Based on High Order Mechanical Properties
Ultrasonic tissue elasticity imaging, which can visualize diseased tissues based on their stiffness, is a useful technique for breast cancer detection. In general, soft tissues including the breast have nonlin...
-
Chapter and Conference Paper
A new half-Fourier image reconstruction for MRI
This paper describes a new image reconstruction method for the half-Fourier MR imaging. The signal to noise ration (SNR) is decreased almost one over square root of 2 as same as the conventional half-Fourier M...
-
Chapter and Conference Paper
A Novel Ultrasonic Imaging of Hemodynamic Force Distribution Based on Velocity Measurement
A hemodynamic force imaging method on the basis of viscosity estimation is presented in this paper. Viscosity is estimated by ultrasonic velocity vector measurement and Navier-Stokes equations, and then shear ...
-
Chapter and Conference Paper
Experimental Investigation of 2D Myocardial Strain Imaging
Abnormal regional wall-motion often appears in the early stages of ischemic heart disease such as angina pectoris and cardiac infarction. Therefore, it is very important to accurately estimate multi-dimensiona...
-
Article
Non-invasive speed of sound measurement in cartilage by use of combined magnetic resonance imaging and ultrasound: an initial study
The speed of sound (SOS) is available as an index of elasticity. Using a combination of magnetic resonance imaging (MRI) and ultrasound, one can measure the SOS. In this study, we verified the accuracy of SOS ...
-
Article
The arrhythmogenic effect of ultrasonic exposure with acoustic radiation force (ARF) impulse on the rabbit heart with ultrasound contrast agent perfluorobutane
Acoustic radiation force (ARF) impulse can be used to estimate the elasticity of cardiac muscle. The purpose of this study was to evaluate the effect of ARF on the heart with concomitant administration of the ...
-
Article
Experimental system for in-situ measurement of temperature rise in animal tissue under exposure to acoustic radiation force impulse
Acoustic radiation force impulse (ARFI) has recently been used for tissue elasticity measurement and imaging. On the other hand, it is predicted that a rise in temperature occurs. In-situ measurement of temper...
-
Article
Erratum to: Ultrasound exposure (mechanical index 1.8) with acoustic radiation force impulse evokes extrasystolic waves in rabbit heart under concomitant administration of an ultrasound contrast agent
-
Article
Ultrasound exposure (mechanical index 1.8) with acoustic radiation force impulse evokes extrasystolic waves in rabbit heart under concomitant administration of an ultrasound contrast agent
Acoustic radiation force impulse (ARFI) is a modality for elasticity imaging of various organs using shear waves. In some situations, the heart is a candidate for elasticity evaluation with ARFI. Additionally,...
-
Article
The effect of ultrasound with acoustic radiation force on rabbit lung tissue: a preliminary study
Acoustic radiation force (ARF) elastography has recently become available. The previous animal studies have revealed lung injuries induced by diagnostic ultrasound, but the effects on the lung resulting from e...
-
Article
Ultrasonic measurement of sound velocity fluctuations in biological tissue due to ultrasonic heating and estimation of thermo-physical properties
Tissue characterization in terms of the differences in thermo-physical properties of biological tissues was investigated in this study. The objective was to measure the ratio of variation in sound velocity due...
-
Article
Intervendor variability of carotid intima–media thickness measurement: validation study using newly developed ultrasound phantom
Ultrasonography-derived carotid artery intima–media thickness (IMT) has been established as an early atherosclerotic imaging biomarker. The IMT reference value of a healthy person is approximately 0.1 × (every...
-
Article
Correction to: Intervendor variability of carotid intima–media thickness measurement: validation study using newly developed ultrasound phantom
In the Original publication of the article Table 3 was published incorrectly.
-
Article
Open AccessApplication of the novel estimation method by shear wave elastography using vibrator to human skeletal muscle
In recent years, non-invasive measurement of tissue stiffness (hardness) using ultrasound elastography has attracted considerable attention. It has been used to evaluate muscle stiffness in the fields of rehab...
-
Article
Acoustic radiation force impulse under clinical conditions with single infusion of ultrasound contrast agent evoking arrhythmias in rabbit heart
We previously reported that acoustic radiation force impulse (ARFI) with concomitant administration of perfluorobutane as an ultrasound contrast agent (UCA)-induced arrhythmias at a mechanical index (MI) of 1....
-
Article
Open AccessCorrection to: A review of physical and engineering factors potentially affecting shear wave elastography
-
Article
On the publication of the special feature on recent progress in basic research useful for the interpretation of ultrasound diagnostic images
