Results 251 to 260 of about 21,910 (284)

Accuracy of Ultrasound in Fetal Femur Length Determination Ultrasound Phantom Study

Investigative Radiology, 1985
An ultrasound phantom was constructed simulating fetal femurs in amniotic fluid. Bones of 26, 36, 50, 58, and 70 mm, representative of gestational ages ranging from 17 to 36 weeks, were scanned with mechanical sector, phased sector, and linear array systems (ATL, Diasonics, Acuson, and GE).
J L, Gamba, J D, Bowie, W C, Dodson, L W, Hedlund   +3 more
openaire   +2 more sources

Training phantom for ultrasound guided biopsy.

The British Journal of Radiology, 1997
Commercial phantoms designed for radiologists to practise the skills needed to biopsy lesions under ultrasound guidance can be prohibitively costly, and do not have an indefinite shelf-life. A gelatin-based in-house model has been developed to recreate the conditions found in human tissues, using materials which are cheap and in everyday use.
R A, Nicholson, M, Crofton
openaire   +2 more sources

Stable phantom materials for ultrasound and optical imaging

Physics in Medicine and Biology, 2016
Phantoms mimicking the specific properties of biological tissues are essential to fully characterize medical devices. Water-based materials are commonly used to manufacture phantoms for ultrasound and optical imaging techniques. However, these materials have disadvantages, such as easy degradation and low temporal stability.
Luciana C, Cabrelli, Pedro I B G B, Pelissari, Alessandro M, Deana, Antonio A O, Carneiro, Theo Z, Pavan   +4 more
openaire   +2 more sources

Ultrasound Phantoms/Animals Experiments

1987
As previously mentioned, two of the advantages of ultrasound are its short wavelength in tissue and the small acoustic impedence differences between various soft tissues. This means that reflections, standing waves, and refraction effects are minimized (especially compared to microwave applications)--facts which make the task of characterizing the SAR ...
openaire   +1 more source

Improving N-wire phantom-based freehand ultrasound calibration

International Journal of Computer Assisted Radiology and Surgery, 2013
   Freehand tracked ultrasound imaging is an inexpensive non-invasive technique used in several guided interventions. This technique requires spatial calibration between the tracker and the ultrasound image plane. Several calibration devices (a.k.a. phantoms) use N-wires that are convenient for automatic procedures since the segmentation of fiducials ...
Guillermo, Carbajal, Andras, Lasso, Alvaro, Gómez, Gabor, Fichtinger   +3 more
openaire   +2 more sources

ANATOMIC MODELS AND PHANTOMS FOR DIAGNOSTIC ULTRASOUND INSTRUCTION

Veterinary Radiology & Ultrasound, 2001
The preparation and application of anatomic models and phantoms to facilitate learning diagnostic ultrasound is described. Imaging with diagnostic ultrasound requires mastery of many skills, along with knowledge of sound‐tissue interactions which contribute to the formation of diagnostic images and artifacts.
C B, Carrig, R L, Pyle
openaire   +2 more sources

Spiral Flow Phantom for Ultrasound Flow Imaging Experimentation

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2017
As new ultrasound flow imaging methods are being developed, there is a growing need to devise appropriate flow phantoms that can holistically assess the accuracy of the derived flow estimates. In this paper, we present a novel spiral flow phantom design whose Archimedean spiral lumen naturally gives rise to multi-directional flow over all possible ...
Billy Y. S. Yiu, Alfred C. H. Yu
openaire   +2 more sources

A phantom for quantitative ultrasound of trabecular bone

Physics in Medicine and Biology, 1994
The propagation mechanisms of ultrasound in trabecular bone are poorly understood and have been the subject of extended debate; also, the reproducibility of ultrasonic measurements on bone in vivo using commercial ultrasound heel-scanning devices is such that the interpretation of the obtained data is difficult.
A J, Clarke, J A, Evans, J G, Truscott, R, Milner, M A, Smith   +4 more
openaire   +2 more sources

Transcranial ultrafast ultrasound Doppler imaging: A phantom study

Ultrasonics
Ultrafast ultrasound Doppler imaging facilitates the assessment of cerebral hemodynamics with high spatio-temporal resolution. However, the significant acoustic impedance mismatch between the skull and soft tissue results in phase aberrations, which can compromise the quality of transcranial imaging and introduce biases in velocity and direction ...
Jiangjin Zhou, Yuanyang Guo, Qiandong Sun, Fanglue Lin, Chen Jiang, Kailiang Xu, Dean Ta   +6 more
openaire   +2 more sources

Ultrasound phantom

The Journal of the Acoustical Society of America, 1990
Ernest L. Madsen, James A. Zagzebski, Gary R. Frank   +2 more
openaire   +1 more source